CN111212358B - Adjustable sound wave loudspeaker system and signal processing method - Google Patents
Adjustable sound wave loudspeaker system and signal processing method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
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Abstract
The application relates to an adjustable sound wave loudspeaker system and a signal processing method, and belongs to the technical field of loudspeakers. The system comprises: the device comprises a band-pass filter, a multipath frequency division unit, N multipath delay phase shifting units and a loudspeaker array; the band-pass filter is used for filtering out signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals; the multi-path frequency dividing unit is used for dividing the frequency of the audible sound signal according to the appointed frequency band to obtain N paths of frequency division sub-signals; each multipath delay phase shifting unit is used for carrying out delay phase shifting of different amplitudes on the frequency division signal corresponding to each multipath delay phase shifting unit so as to obtain M paths of delay phase shifting signals; the speaker array includes n×m speaker units, each speaker unit corresponding to a delay phase-shifted signal. The system utilizes the phase control deflection principle of the audio wave beam to realize the sound wave directivity adjustment or the direction-variable directional broadcasting so as to overcome the defects of low efficiency and difficult realization of the currently adopted method.
Description
Technical Field
The application belongs to the technical field of speakers, and particularly relates to an adjustable sound wave speaker system and a signal processing method.
Background
If the existing loudspeaker systems (sound boxes) need to carry out sound wave directivity adjustment or direction-changing directional broadcasting, the placement position or the direction of the loudspeaker systems often need to be changed, and the process is difficult to achieve for the loudspeaker systems placed in special places such as squares, halls and the like, because the loudspeaker systems are often placed at high places, time and labor are often wasted, and the installation of the common loudspeaker systems is difficult for engineering construction, and the placement or the direction of the loudspeaker systems are highly required.
In the prior art, to realize directional adjustment or direction-variable directional broadcasting, directional broadcasting of sound wave modulation ultrasonic waves can be adopted to realize directional adjustment or direction-variable directional broadcasting, directional propagation is realized by utilizing directional propagation of ultrasonic waves, and then the ultrasonic waves are recovered through air self-demodulation after propagating for a certain distance, so that the directional broadcasting is realized, but the method has lower efficiency and serious space ultrasonic pollution. In addition, it is difficult to realize directivity adjustment at any time.
Disclosure of Invention
In view of the above, the present application is directed to an adjustable acoustic speaker system and a signal processing method, so as to overcome the defects of low efficiency and difficulty in implementing the current method of using the directional broadcasting of the acoustic modulation ultrasonic wave to implement the directional adjustment or the direction-variable directional broadcasting.
Embodiments of the present application are implemented as follows:
In a first aspect, an embodiment of the present application provides an adjustable acoustic wave speaker system, including: the device comprises a band-pass filter, a multipath frequency division unit, N multipath delay phase shifting units and a loudspeaker array; the band-pass filter is used for filtering signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with the frequency bands between the first value and the second value; the multi-channel frequency division unit is used for dividing the frequency of the audible sound signal according to the appointed frequency band to obtain N channels of frequency division sub-signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1; each multipath delay phase shifting unit is connected with the multipath frequency dividing unit and is used for carrying out delay phase shifting of different amplitudes on frequency dividing sub-signals corresponding to the multipath delay phase shifting units to obtain M paths of delay phase shifting signals, wherein M is an integer larger than 1; the speaker array includes n×m speaker units, each speaker unit corresponding to a delay phase-shifted signal. In the embodiment of the application, the high-frequency and low-frequency parts in the input signal are filtered, then the audible sound signal between the low frequency and the high frequency is divided into N paths of frequency division sub-signals according to the appointed frequency band, then each path of frequency division sub-signals is respectively subjected to delay phase shifting with different amplitudes, and the sound wave directivity adjustment or direction-changing directional broadcasting is realized by utilizing the phase control deflection principle of the sound wave beam, so that the defects of low efficiency and difficult realization existing in the current method for realizing the directivity adjustment or direction-changing directional broadcasting by adopting the sound wave modulation ultrasonic wave are overcome.
In an alternative embodiment of the first aspect of the present application, the tunable acoustic wave speaker system further includes: the directional control instruction decoding unit is respectively connected with each multipath delay phase shifting unit in the N multipath delay phase shifting units, and is used for extracting a control signal from an input signal and transmitting the control signal to each multipath delay phase shifting unit so that each multipath delay phase shifting unit can respectively delay and phase shift frequency division sub-signals corresponding to the multipath delay phase shifting unit according to the control signal, wherein the input signal is a mixed signal mixed with a control signal and an audio signal for controlling the delay phase shifting amplitude. In the embodiment of the application, a control signal for controlling the delay phase-shifting amplitude is mixed in an audio signal to be used as an input signal of an adjustable acoustic wave loudspeaker system, and then the control signal is extracted from the input signal by a directional control instruction decoding unit and is transmitted to each multipath delay phase-shifting unit, so that each multipath delay phase-shifting unit carries out delay phase shifting with different amplitudes on a frequency division signal corresponding to the multipath delay phase-shifting unit according to the control signal, thereby being convenient for adjusting the amplitude of the delay phase-shifting.
In an alternative embodiment of the first aspect of the present application, the tunable acoustic wave speaker system further includes: and each multipath delay phase-shifting unit is connected with the loudspeaker array through M power amplification units respectively, and each path of power amplification unit is used for amplifying the power of the corresponding delay phase-shifting signal and outputting the amplified delay phase-shifting signal to the corresponding loudspeaker unit. In the embodiment of the application, before the delay phase-shifting signal is input into the loudspeaker array, the delay phase-shifting signal is subjected to power amplification so as to improve the playing effect.
In an alternative embodiment of the first aspect of the present application, the first value is 200Hz and the second value is 13000Hz. In the embodiment of the application, the signals with the frequency bands below 200Hz and above 13000Hz are filtered out to reduce the influence of ineffective sound, so as to reduce the difficulty of realizing directivity adjustment or direction-changing directional broadcasting.
In an alternative embodiment of the first aspect of the present application, the multipath frequency dividing unit is configured to divide the audible sound signal according to octaves into 6 paths of frequency divided signals of 200 to 400Hz, 400 to 800Hz, 800 to 1600Hz, 1600 to 3200Hz, 3200 to 6400Hz and 6400 to 13000 Hz. In the embodiment of the application, the audible sound signal is divided according to the octaves, so that the frequency of the low-end signal and the high-end signal in each signal after frequency division is only 1 octave, and the problems in the design and debugging process are simplified.
In an alternative embodiment of the first aspect of the present application, the value of M is any integer ranging from 6 to 10. In the embodiment of the application, each path of frequency division sub-signal is divided into 6-10 delay phase-shifting signals with phase-shifting delay, so that the deflection of the wave beam is obtained, the deflection effect of the acoustic wave beam is achieved, and the complexity and design cost of the loudspeaker array can be further reduced while the deflection effect is ensured.
In an alternative embodiment of the first aspect of the present application, the speaker array comprises 6*6 speaker units. In the embodiment of the application, the loudspeaker array adopts 6*6 design, so that the complexity and the design cost of the loudspeaker array can be further reduced while the deflection effect is ensured.
In an alternative embodiment of the first aspect of the present application, the speaker units in different rows of the speaker array have different sizes, and the speaker units in different columns in the same row have the same size. In the embodiment of the application, the sizes of the speaker units in different rows in the speaker array are different, and the sizes of the speaker units in different columns in the same row are the same, so that the difference of the speaker units in different columns in the speaker array is reduced while the deflection of the sound beam is ensured as much as possible.
In an alternative embodiment of the first aspect of the present application, the size of the speaker units between different rows in the speaker array decreases with increasing corresponding frequency bands. In the embodiment of the application, the higher the frequency is, the sharper the sound heard by the human ear is, and the lower the frequency is, the lower the sound heard by the human ear is, so that the size of the speaker unit with the small corresponding frequency band is increased, and the size of the speaker unit with the small corresponding frequency band is reduced, so that the sound played by the speaker array is not easily influenced by the frequency, and the hearing efficiency of the human ear is optimized.
In a second aspect, an embodiment of the present application further provides a signal processing method, which is applied to an adjustable acoustic speaker system as provided in the embodiment of the first aspect and/or any optional embodiment of the first aspect, where the method includes: filtering signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with frequency bands between the first value and the second value; dividing the frequency of the audible sound signal according to a designated frequency band to obtain N paths of frequency division frequency signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1; for each path of frequency division signal, carrying out delay phase shifting on the frequency division signal with different amplitudes to obtain M paths of delay phase shifting signals, wherein M is an integer greater than 1; and outputting each delay phase-shift signal to a corresponding loudspeaker unit, wherein each delay phase-shift signal corresponds to one loudspeaker unit. In the embodiment of the application, the high-frequency and low-frequency parts in the input signal are filtered, then the audible sound signal between the low frequency and the high frequency is divided into N paths of frequency division sub-signals according to the appointed frequency band, then each path of frequency division sub-signals is respectively subjected to delay phase shifting with different amplitudes, and the sound wave directivity adjustment or direction-changing directional broadcasting is realized by utilizing the phase control deflection principle of the sound wave beam, so that the defects of low efficiency and difficult realization existing in the current method for realizing the directivity adjustment or direction-changing directional broadcasting by adopting the sound wave modulation ultrasonic wave are overcome.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The above and other objects, features and advantages of the present application will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the several views of the drawings. The drawings are not intended to be drawn to scale, with emphasis instead being placed upon illustrating the principles of the application.
Fig. 1 shows a schematic structural diagram of an adjustable acoustic speaker system according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of still another tunable acoustic speaker system according to an embodiment of the present application.
Fig. 3 shows a schematic plan view of a speaker array according to an embodiment of the present application.
Fig. 4 shows a schematic diagram of sharpness angle θ ∞ and-3 dB beamwidth θ -3dB provided by an embodiment of the application.
Fig. 5 shows a schematic diagram of a phased array provided by an embodiment of the application.
Fig. 6 is a schematic structural diagram of still another tunable acoustic speaker system according to an embodiment of the present application.
Fig. 7 is a schematic flow chart of a signal processing method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action in the description of the application without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; or may be an electrical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Furthermore, the term "and/or" in the present application is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.
In view of the defects of the current method for realizing directional adjustment or direction-changing directional broadcasting by adopting the directional broadcasting of the sound wave modulation ultrasonic wave, the embodiment of the application provides an adjustable sound wave loudspeaker system which can easily realize the directional adjustment or direction-changing directional broadcasting of the sound wave. The principle of the tunable acoustic speaker system shown in fig. 1 will be described below. The tunable acoustic speaker system includes: the device comprises a band-pass filter, a multipath frequency division unit, N multipath delay phase shifting units and a loudspeaker array.
The band-pass filter is connected with the multipath frequency division unit and is used for filtering out signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with the frequency bands between the first value and the second value. Since the audio directivity below 200Hz is almost uncontrollable and there is no general requirement for the broadcast sound effect to restore the sound below 200Hz and above 13000Hz, as an implementation, the first value is 200Hz and the second value is 13000Hz, i.e. the band-pass filter is used to filter out the signals with frequency bands below 200Hz and above 13000Hz in the input signal, so as to obtain the audible sound signals with frequency bands between 200Hz and 13000 Hz. It will of course be appreciated that the first value is not limited to 200Hz, but may be other values, such as 190Hz, 210Hz, etc.; similarly, the second value is not limited to 13000Hz, but may be other values such as 12800Hz, 12900Hz, etc., and thus the specific value thereof is not to be construed as limiting the present application.
The input end of the multi-path frequency dividing unit is connected with the band-pass filter, the output end of the multi-path frequency dividing unit is connected with the N multi-path delay phase shifting units, and the multi-path frequency dividing unit is used for dividing the audible sound signals selected by the band-pass filter according to the designated frequency band to obtain N paths of frequency division sub-signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1. As an embodiment, the multi-path frequency dividing unit may divide the audible sound signal by octaves, for example, divide the audible sound signal of 200-13000 Hz by octaves into 6-path frequency divided signals of 200-400 Hz, 400-800 Hz, 800-1600 Hz, 1600-3200 Hz, 3200-6400 Hz and 6400-13000 Hz. Of course, it should be noted that the multipath frequency dividing unit may divide the audible sound signal according to other frequency bands instead of the octave, for example, divide the audible sound signal according to one half of the octave, and at this time, divide the audible sound signal into
And/>Is divided by 12 paths of the sub-signals. Of course, the audible sound signal may also be divided by one third octave, one sixth octave, and one twelfth octave. For example, an audible sound signal of 200-13000 Hz is divided into 18 paths of divided sub-signals according to one third octave; dividing the audible sound signal of 200-13000 Hz into 36 paths of frequency division signals according to one sixth of octaves; the audible sound signal of 200-13000 Hz is divided into 72 paths of frequency division signals according to twelve times of octaves.
Each of the N multipath delay phase shift units is connected to the multipath crossover unit and also to a corresponding speaker unit in the speaker array. Each multipath delay phase shifting unit corresponds to one path of frequency division sub-signal, taking the above-mentioned 6 paths of frequency division sub-signals of 200-400 Hz, 400-800 Hz, 800-1600 Hz, 1600-3200 Hz, 3200-6400 Hz and 6400-13000 Hz as an example, then at this time, there are corresponding 6 multipath delay phase shifting units, each multipath delay phase shifting unit corresponds to one path of frequency division sub-signal, for example, multipath delay phase shifting unit 1 corresponds to the frequency division sub-signal of the frequency band of 200-400 Hz, multipath delay phase shifting unit 2 corresponds to the frequency division sub-signal of the frequency band of 400-800 Hz, multipath delay phase shifting unit 3 corresponds to the frequency division sub-signal of the frequency band of 800-1600 Hz, multipath delay phase shifting unit 4 corresponds to the frequency division sub-signal of the frequency band of 1600-3200 Hz, multipath delay phase shifting unit 5 corresponds to the frequency division sub-signal of the frequency band of 3200-6400 Hz, and multipath delay phase shifting unit 6 corresponds to the frequency division sub-signal of the frequency band of 6400-13000 Hz.
Each multipath delay phase shifting unit is used for carrying out delay phase shifting on frequency division signals corresponding to the multipath delay phase shifting units with different amplitudes to obtain M paths of delay phase shifting signals, M is an integer larger than 1, and each multipath delay phase shifting unit comprises M delay phase shifting units. As an embodiment, M has a value ranging from any integer between 6 and 10, i.e. 6, 7, 8, 9 or 10. It will be understood that the value of M may be greater than 10, and that as the value increases, the number of speaker units in the corresponding speaker array also needs to be increased correspondingly. Taking the value of M as 6 as an example, after the 6 paths of frequency division signals are respectively subjected to delay phase shifting with different amplitudes through corresponding multipath delay phase shifting units, the frequency division signals are changed into 36 paths of delay phase shifting signals, and the 36 paths of delay phase shifting signals are respectively loaded onto corresponding loudspeaker units of a loudspeaker array to form a sound field with fixed directivity, namely, the frequency division signals with the frequency band of 200-400 Hz are subjected to delay phase shifting with different amplitudes through a multipath delay phase shifting unit 1, so that 6 paths of delay phase shifting signals are obtained; the frequency-division frequency signal of 400-800 Hz frequency band is subjected to delay phase shifting with different amplitudes through a multipath delay phase shifting unit 2 to obtain 6 paths of delay phase shifting signals; the frequency-division frequency signal of 800-1600 Hz frequency band is subjected to delay phase shifting with different amplitudes through a multipath delay phase shifting unit 3 to obtain 6 paths of delay phase shifting signals; the frequency-division frequency signal of 1600-3200 Hz frequency band is subjected to delay phase shifting of different amplitudes through a multipath delay phase shifting unit 4 to obtain 6 paths of delay phase shifting signals; the frequency division signal of the frequency band of 3200-6400 Hz is subjected to delay phase shifting with different amplitudes through a multipath delay phase shifting unit 5 to obtain 6 paths of delay phase shifting signals; the frequency-division signal of the frequency band of 6400-13000 Hz is subjected to delay phase shifting with different amplitudes through a multipath delay phase shifting unit 6, and 6 paths of delay phase shifting signals are obtained.
The delay phase shifting process of each multipath delay phase shifting unit for carrying out different amplitude on the corresponding frequency division signal is the same, and the delay phase shifting process of different amplitude on the frequency division signal of the frequency band of 200-400 Hz is explained below. Assuming that M is 6, the multipath delay phase shifting unit 1 includes 6 delay phase shifting units 1, and the first delay phase shifting unit 1 delays and shifts the signal, where the amplitude of the signal may be 0 degree, i.e. no delay phase exists; the second delay phase-shifting unit 1 delays and shifts the signal, and the amplitude of the signal can be 6 degrees, namely, the phase delay is 6 degrees; when the third delay phase-shifting unit 1 delays and shifts the signal, the amplitude of the signal can be 12 degrees, namely, the phase delay is 12 degrees; the fourth delay phase-shifting unit 1 delays and shifts the signal, and the amplitude of the signal can be 18 degrees, namely 18 degrees; when the fifth delay phase-shifting unit 1 delays and shifts the signal, the amplitude of the signal can be 24 degrees, namely, the phase delay is 24 degrees; the sixth delay phase-shifting unit 1 delays and shifts the signal, and its amplitude may be 30 degrees, that is, the delay phase is 30 degrees, and its schematic diagram is shown in fig. 2.
The loudspeaker array comprises N.times.M loudspeaker units, each loudspeaker unit corresponds to a delay phase-shifting signal, taking N, M values as 6 as examples, and after the 6 paths of frequency division signals respectively pass through the corresponding multipath delay phase-shifting units to carry out delay phase shifting with different amplitudes, the frequency division signals become 36 paths of delay phase-shifting signals, and the 36 paths of delay phase-shifting signals are respectively loaded onto the corresponding loudspeaker units (the number of the delay phase-shifting signals is 36) of the loudspeaker array to form a sound field with fixed directivity. If N is 6 and m is 10, the speaker array includes 6×10 speaker units, i.e. 6 rows and 10 columns, where each row corresponds to a frequency band.
As an embodiment, the size of the speaker units in different rows in the speaker array is different, and the size of the speaker units in different columns in the same row is the same. A speaker array as shown in fig. 3 is illustrated. The speaker array shares 36 speaker units, each frequency band corresponds to 6 speaker units, the row spacing is D, the column spacing is D, and the value of D can be determined according to the formula (1). The loudspeaker array adopts a closed box structure, the length is L, the width is L, and the depth is h.
Wherein, formula (1) is: To obtain a sharp beam, one is to increase the number n of speaker units of the speaker array or the spacing d of the speaker units, and the other is to increase the frequency f, (where wavelength λ=c/f, where c is the speed of sound in the medium). The higher the frequency, the smaller the beamwidth, given the array structure and shape. θ -3dB is the beam width at which the sidelobe sound drops by-3 dB. The beamwidth is a parameter describing the sharpness of the main beam and is typically defined as twice the corresponding angle at the half-power point, i.e. θ -3dB.
In one embodiment, the size of the speaker units between different rows in the speaker array decreases with increasing corresponding frequency bands. I.e. the size of the speaker unit corresponding to the frequency band of 200-400 Hz is the largest and the size of the speaker unit corresponding to the frequency band of 6400-13000 Hz is the smallest.
The directional sharpness angle of the speaker array over a wide frequency range can be adjusted by equation (2). The direction sharpness angle θ≡is the difference between the two angles when the main beam deflects to both sides with the angle and the value of the directivity function becomes the first minimum value, as shown in fig. 4. n speaker arrays with a spacing d, the directivity function of which can be expressed as:
From equation (2), it can be found that the sound field becomes directional after interference due to the difference in sound path between each sound source and the observation point. The directivity of a speaker array is affected by the number of cells of the array, the pitch of the cells, and the frequency. Because of the relative physical spacing of the speaker units on the speaker array, the directional sharpness angle for different frequencies of sound is not uniform, and therefore it is also important and meaningful how to coordinate the directional sharpness angle θ ∞ of the speaker array over a wide sound frequency (200-13000 Hz) band. Wherein, deflection angle θ 0 is:
where x is the base number of the delay path corresponding to other array elements assuming the initial phase is 0. As can be seen from fig. 5, x=ct, where c is the speed of sound in the medium, t is the delay time, and d is the spacing of the speakers (sound sources).
The adjustable sound wave loudspeaker system utilizes the phase control deflection principle of sound wave beams to realize sound wave directivity adjustment or direction-variable directional broadcasting. The phased array obtains the deflection of the wave beam by adjusting different array elements and corresponding phase delay amounts, thereby achieving the effect of deflecting the acoustic wave beam. The phase control is firstly used for the radar antenna array, and the transmission angle of the antenna array can be changed by controlling the delay of the antenna units, and the principle is shown in figure 5. If the frequency is reduced, the method can be used on sound waves to achieve the effect of deflecting sound beams, but the audible sound waves have about 10 octaves, so that the octave width is met, and the layout and the phase control of array units are quite difficult. Therefore, in the embodiment of the application, the frequency division sub-signals of 200-400 Hz, 400-800 Hz, 800-1600 Hz, 1600-3200 Hz, 3200-6400 Hz and 6400-13000 Hz, which are 6 octaves, can be obtained respectively by filtering the signals of the whole audio signal with the first value (such as 200 Hz) below and the second value (such as 13000 Hz) above and then dividing the frequency of the signals of the frequency band of 200-13000 Hz according to the width of the designated frequency band (such as octaves), and then processing each octave signal (frequency division sub-signal) separately.
In view of the fact that the speaker array may be controlled at a far end in order to facilitate adjustment of the amplitude of the delay phase shift according to actual needs, at this time, a control signal for controlling the amplitude of the delay phase shift may be mixed into the input audio signal, and accordingly, in this embodiment, as shown in fig. 6, the tunable acoustic speaker system further includes: and a directional control instruction decoding unit. The directional control instruction decoding unit is respectively connected with each multipath delay phase shifting unit in the N multipath delay phase shifting units, and is used for extracting a control signal from an input signal and transmitting the control signal to each multipath delay phase shifting unit so that each multipath delay phase shifting unit respectively carries out delay phase shifting of different amplitudes on a frequency division signal corresponding to the multipath delay phase shifting unit according to the control signal, at the moment, the input signal is a mixed signal mixed with a control signal and an audio signal for controlling the delay phase shifting amplitude, for example, the control signal is mixed with the audio signal after being coded in a double audio mode. This can better address the problem of the remote communication link for speaker control.
Considering that if the delay phase-shifted signal is directly output to the corresponding speaker unit, the playing effect may be affected because the power of the delay phase-shifted signal is smaller, as an embodiment, the tunable acoustic speaker system further includes: and a power amplifying unit. Each multipath delay phase-shifting unit is connected with the loudspeaker array through M power amplifying units respectively, and each path of power amplifying unit is used for amplifying the power of the corresponding delay phase-shifting signal and outputting the amplified delay phase-shifting signal to the corresponding loudspeaker unit. Here, the structure of the tunable acoustic wave speaker system shown in fig. 6 is not to be construed as limiting the present application. The two structures of the power amplifying unit and the directional control instruction decoding unit can exist at the same time or only any one of the two structures can exist. Fig. 6 shows a case where both exist at the same time, and the tunable acoustic speaker system includes: the device comprises a band-pass filter, a multipath frequency division unit, a directional control instruction decoding unit, N multipath delay phase shifting units, a power amplification unit and a loudspeaker array. In this embodiment, the band-pass filter is responsible for extracting an audible sound signal with a frequency band between 200 Hz and 13000Hz from a mixed signal mixed with a control signal and an audio signal for controlling the delay phase-shift amplitude, and the directional control instruction decoding unit is responsible for processing a control signal (directivity adjustment instruction) sent from a far end, that is, extracting a control signal from the mixed signal, mixing the extracted control signal with a segmented audio signal output by the multipath frequency division unit, and simultaneously sending the mixed signal to each multipath delay phase-shift unit for delay phase shift. The multi-path frequency division unit carries out frequency division processing on 200-13000 Hz analog signals input in a single path through algorithms such as Fourier transform and the like to generate 6 paths of single octave signals; each multipath delay phase shifting unit carries out different delay phase shifting on the corresponding frequency division signal according to the control signal; the power amplifying unit is responsible for amplifying the corresponding delay phase-shifted signal so as to push the normal operation of the loudspeaker array.
The embodiment of the application also provides a signal processing method, which is applied to the tunable acoustic speaker system, and the steps included in the method will be described with reference to fig. 7.
Step S101: and filtering out signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with frequency bands between the first value and the second value.
And filtering signals with frequency bands below a first value and above a second value in the input signals by using a band-pass filter to obtain audible sound signals with frequency bands between the first value and the second value.
In an alternative embodiment, the first value is 200Hz and the second value is 13000Hz.
Step S102: and dividing the frequency of the audible sound signal according to the appointed frequency band to obtain N paths of frequency division sub-signals with different frequency bands and continuous frequency bands.
And dividing the frequency of the audible sound signal according to the designated frequency band by utilizing a multi-path frequency dividing unit to obtain N paths of frequency division sub-signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1.
In an alternative embodiment, the audible sound signal is divided by octaves into 6-way divided-down signals of 200-400 Hz, 400-800 Hz, 800-1600 Hz, 1600-3200 Hz, 3200-6400 Hz and 6400-13000 Hz.
Step S103: and aiming at each path of frequency division signal, carrying out delay phase shifting on the frequency division signal with different amplitudes to obtain M paths of delay phase shifting signals.
For each path of frequency-division signal, the frequency-division signal is subjected to delay phase shifting with different amplitudes by utilizing a multipath delay phase shifting unit, and M paths of delay phase shifting signals are obtained, wherein M is an integer greater than 1. Each frequency division sub-signal corresponds to a multi-path delay phase shift unit, for example, the octave of the audible sound signal is divided into 6 frequency division sub-signals, and the number of the corresponding multi-path delay phase shift units is 6.
Step S104: and outputting each delay phase-shift signal to a corresponding loudspeaker unit, wherein each delay phase-shift signal corresponds to one loudspeaker unit.
Optionally, when the input signal is a mixed signal mixed with a control signal for controlling the delay phase-shift amplitude and an audio signal, the method further comprises: a control signal is extracted from the input signal to delay and shift each of the divided sub-signals by a different magnitude based on the control signal. At this time, the corresponding tunable acoustic wave speaker system further includes: and a directional control instruction decoding unit. The directional control instruction decoding unit is used for extracting control signals from input signals and transmitting the control signals to each multipath delay phase shifting unit so that each multipath delay phase shifting unit can carry out delay phase shifting of different amplitudes on frequency division sub-signals corresponding to the multipath delay phase shifting units according to the control signals.
Considering that if the delay phase-shifted signal is directly output to the corresponding speaker unit, the playing effect may be affected due to the smaller power of the delay phase-shifted signal, so optionally, the method further includes: and amplifying the power of each delay phase-shift signal and outputting the amplified power to a corresponding loudspeaker unit. At this time, the tunable acoustic wave speaker system further includes: and a power amplifying unit. Each multipath delay phase-shifting unit is connected with the loudspeaker array through M power amplifying units respectively, and each path of power amplifying unit is used for amplifying the power of the corresponding delay phase-shifting signal and outputting the amplified delay phase-shifting signal to the corresponding loudspeaker unit.
In some embodiments, parts are not mentioned, and reference is made to descriptions of the same parts between different implementations, and for brevity, reference may be made to corresponding parts in other embodiments for details of description, since the principles and technical effects of the implementation are the same.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. An adjustable acoustic speaker system, comprising:
The band-pass filter is used for filtering signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with frequency bands between the first value and the second value, wherein the first value is 200Hz, and the second value is 13000Hz;
the multi-channel frequency division unit is used for dividing the frequency of the audible sound signal according to the appointed frequency band to obtain N channels of frequency division sub-signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1;
n multipath delay phase shifting units, each multipath delay phase shifting unit is connected with the multipath frequency dividing unit, each multipath delay phase shifting unit is used for carrying out delay phase shifting of different amplitudes on frequency dividing sub-signals corresponding to the multipath delay phase shifting units to obtain M paths of delay phase shifting signals, and M is an integer larger than 1;
The loudspeaker array comprises N x M loudspeaker units, and each loudspeaker unit corresponds to one delay phase-shift signal;
The tunable acoustic speaker system further includes: the directional control instruction decoding unit is respectively connected with each multipath delay phase shifting unit, and is used for extracting control signals from input signals and transmitting the control signals to each multipath delay phase shifting unit so that each multipath delay phase shifting unit can respectively delay and shift different amplitudes of frequency division sub-signals corresponding to the multipath delay phase shifting unit according to the control signals, wherein the input signals are mixed signals which are mixed with control signals and audio signals for controlling the delay phase shifting amplitude.
2. The tunable acoustic wave speaker system of claim 1 further comprising: and each multipath delay phase-shifting unit is connected with the loudspeaker array through M power amplification units respectively, and each path of power amplification unit is used for amplifying the power of the corresponding delay phase-shifting signal and outputting the amplified delay phase-shifting signal to the corresponding loudspeaker unit.
3. The tunable acoustic speaker system of claim 1 wherein the multi-way crossover unit is configured to crossover the audible acoustic signal by octaves into 6-way crossover signals of 200-400 Hz, 400-800 Hz, 800-1600 Hz, 1600-3200 Hz, 3200-6400 Hz, and 6400-13000 Hz.
4. A tunable acoustic speaker system according to claim 3, wherein M has a value in the range of any integer between 6 and 10.
5. The tunable acoustic wave speaker system of claim 4 wherein the speaker array comprises 6*6 speaker units.
6. The tunable acoustic wave speaker system of any one of claims 1-5, wherein the speaker units in different rows of the speaker array are different in size and the speaker units in different columns in the same row are the same in size.
7. The tunable acoustic wave speaker system of claim 6 wherein the size of speaker units between different rows in the speaker array decreases with increasing corresponding frequency bands.
8. A signal processing method applied to the tunable acoustic wave speaker system according to any one of claims 1 to 7, the method comprising:
filtering signals with frequency bands below a first value and above a second value in the input signals to obtain audible sound signals with frequency bands between the first value and the second value;
Dividing the frequency of the audible sound signal according to a designated frequency band to obtain N paths of frequency division frequency signals with different frequency bands and continuous frequency bands, wherein N is an integer greater than 1;
for each path of frequency division signal, carrying out delay phase shifting on the frequency division signal with different amplitudes to obtain M paths of delay phase shifting signals, wherein M is an integer greater than 1;
and outputting each delay phase-shift signal to a corresponding loudspeaker unit, wherein each delay phase-shift signal corresponds to one loudspeaker unit.
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