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EP0986047A3 - Audio encoding system - Google Patents

Audio encoding system Download PDF

Info

Publication number
EP0986047A3
EP0986047A3 EP99202927A EP99202927A EP0986047A3 EP 0986047 A3 EP0986047 A3 EP 0986047A3 EP 99202927 A EP99202927 A EP 99202927A EP 99202927 A EP99202927 A EP 99202927A EP 0986047 A3 EP0986047 A3 EP 0986047A3
Authority
EP
European Patent Office
Prior art keywords
threshold
frame
perceptual entropy
switching
difference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99202927A
Other languages
German (de)
French (fr)
Other versions
EP0986047A2 (en
Inventor
David Duenas
Jeremy Bennett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Television AS
Original Assignee
Tandberg Television AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tandberg Television AS filed Critical Tandberg Television AS
Publication of EP0986047A2 publication Critical patent/EP0986047A2/en
Publication of EP0986047A3 publication Critical patent/EP0986047A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

A method of switching between long and short block encoding of frames of audio data with improved noise reduction in relation to the number of bits required for encoding. The method comprises the steps of calculating the difference in the long block perceptual entropy of a present frame and the preceding frame and switching to short block encoding of the present frame if the difference is greater than a first threshold. The method may further comprising the steps of comparing the long block perceptual entropy of the succeeding frame with a second threshold if the difference is greater than the first threshold, and switching to short block encoding of the succeeding frame if the long block perceptual entropy of the succeeding frame is greater than the second threshold. The method may additionally or alternatively involve the study of the perceptual entropy of short blocks.
EP99202927A 1998-09-11 1999-09-08 Audio encoding system Withdrawn EP0986047A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9819920A GB9819920D0 (en) 1998-09-11 1998-09-11 Audio encoding system
GB9819920 1998-09-11

Publications (2)

Publication Number Publication Date
EP0986047A2 EP0986047A2 (en) 2000-03-15
EP0986047A3 true EP0986047A3 (en) 2001-09-26

Family

ID=10838782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99202927A Withdrawn EP0986047A3 (en) 1998-09-11 1999-09-08 Audio encoding system

Country Status (2)

Country Link
EP (1) EP0986047A3 (en)
GB (1) GB9819920D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7742737B2 (en) 2002-01-08 2010-06-22 The Nielsen Company (Us), Llc. Methods and apparatus for identifying a digital audio signal

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3762579B2 (en) 1999-08-05 2006-04-05 株式会社リコー Digital audio signal encoding apparatus, digital audio signal encoding method, and medium on which digital audio signal encoding program is recorded
WO2004038538A2 (en) 2002-10-23 2004-05-06 Nielsen Media Research, Inc. Digital data insertion apparatus and methods for use with compressed audio/video data
CA2562137C (en) 2004-04-07 2012-11-27 Nielsen Media Research, Inc. Data insertion apparatus and methods for use with compressed audio/video data

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5627938A (en) * 1992-03-02 1997-05-06 Lucent Technologies Inc. Rate loop processor for perceptual encoder/decoder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5627938A (en) * 1992-03-02 1997-05-06 Lucent Technologies Inc. Rate loop processor for perceptual encoder/decoder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7742737B2 (en) 2002-01-08 2010-06-22 The Nielsen Company (Us), Llc. Methods and apparatus for identifying a digital audio signal
US8548373B2 (en) 2002-01-08 2013-10-01 The Nielsen Company (Us), Llc Methods and apparatus for identifying a digital audio signal

Also Published As

Publication number Publication date
GB9819920D0 (en) 1998-11-04
EP0986047A2 (en) 2000-03-15

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