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Withdrawn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Withdrawn legal-status Critical Current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 OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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

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
GB9819920 1998-09-11
GB9819920A GB9819920D0 (en) 1998-09-11 1998-09-11 Audio encoding system

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
NZ539596A (en) 2002-10-23 2008-11-28 Nielsen Media Res Inc Digital data insertion apparatus and methods for use with compressed audio/video data
TWI404419B (en) 2004-04-07 2013-08-01 Nielsen Media Res Inc Data insertion methods , sysytems, machine readable media and apparatus 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

Similar Documents

Publication Publication Date Title
TW357507B (en) Coding scheme for digital communication systems
EP1074976A3 (en) Block switching based subband audio coder
CA2327405A1 (en) Perceptual audio coder bit allocation scheme providing improved perceptual quality consistency
EP1005230A3 (en) Coding apparatus and method, decoding apparatus and method, data processing system, and storage medium
EP1081684A3 (en) Method for editing a subband encoded audio signal
EP1250012A3 (en) Adaptive quantization based on bit rate prediction and prediction error energy
EP0833520A3 (en) Video predictive coding apparatus and method
CA2178943A1 (en) Method and Device for Determining Bit Allocation in a Video Compression System
EP1315380A3 (en) Object-based bit rate control method and system thereof
EP1229739A3 (en) Data structure for image transmission, image coding method, and image decoding method
EP0808068A3 (en) Methods and apparatus for removing blocking effect in a motion picture decoder
EP1845519A3 (en) Encoding and decoding of multi-channel audio signals based on a main and side signal representation
EP0987827A3 (en) Audio signal encoding method without transmission of bit allocation information
EP1030456A3 (en) Error correction coding/decoding method and apparatus
EP0833522A3 (en) Video signal encoding method and apparatus employing an adaptive quantization technique
EP0831658A3 (en) Encoder/decoder for coding/decoding gray scale shape data and method thereof
WO2002096118A3 (en) Decoding compressed image data
EP1063851A3 (en) Apparatus and method of encoding moving picture signal
EP0859517A3 (en) Video coder employing pixel transposition
EP0833519A3 (en) Segmentation and background suppression in JPEG-compressed images using encoding cost data
EP0725493A3 (en) A method of window switching in an audio coder
EP0725545A3 (en) A method for encoding and decoding moving picture signals
CA2157066A1 (en) Method for Controlling a Compressed Data Buffer
CA2204219A1 (en) Video transcoding with interim encoding format
EP1168633A3 (en) Method and apparatus for decoding block codes

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TANDBERG TELEVISION ASA

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20020227