NO931974L - System til komprimering av audiodata - Google Patents

System til komprimering av audiodata

Info

Publication number
NO931974L
NO931974L NO931974A NO931974A NO931974L NO 931974 L NO931974 L NO 931974L NO 931974 A NO931974 A NO 931974A NO 931974 A NO931974 A NO 931974A NO 931974 L NO931974 L NO 931974L
Authority
NO
Norway
Prior art keywords
audio
kbps
comparable
audio data
bit rate
Prior art date
Application number
NO931974A
Other languages
English (en)
Other versions
NO931974D0 (no
Inventor
Kumar Swaminathan
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of NO931974D0 publication Critical patent/NO931974D0/no
Publication of NO931974L publication Critical patent/NO931974L/no

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
    • G10L19/26—Pre-filtering or post-filtering
    • 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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/90—Pitch determination of speech signals
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0002—Codebook adaptations
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0003—Backward prediction of gain
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/93—Discriminating between voiced and unvoiced parts of speech signals

Abstract

En høykvalitets audiokodek med lav blthastlghet har en reprodusert stemmekvalitet som er sammenlignbar med kvaliteten for kodek med full hastighet, komprimerer audiodata som samples ved 8 KBz, f.eks 64 Kbps PCM, til 4.2 Kbps, eller dekomprimerer audiodata tilbake til de originale audiodata, eller begge. Den tilhørende degradering i stemmekvalitet er sammenlignbar med standard 8,0 Kbps stemmekoder. Dette oppnås ved å bruke samme parametriske modell som anvendes l tradisjonelle CELP kodere men ved å bestemme kvantisering, koding og oppdatering av disse parametre på en annen måte. Audlodekoderen (26) tilsvarer de fleste CELP dekodere bortsett fra at den arbeider i to modi avhengig av den mottatte modusbit. Både stemmeleie -forfiltrering og global etterfiltrering anvendes for å forbedre de syntetiserte audiodata. I tillegg er innbyggede feilpåvisnings- og feiIgjenvinningsopplegg benyttet som bidrag til å dempe virkningene av eventuelle over- feringsfeil som ikke kan korrigeres.
NO931974A 1992-06-01 1993-05-28 System til komprimering av audiodata NO931974L (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US89159692A 1992-06-01 1992-06-01
US07/905,992 US5495555A (en) 1992-06-01 1992-06-25 High quality low bit rate celp-based speech codec

Publications (2)

Publication Number Publication Date
NO931974D0 NO931974D0 (no) 1993-05-28
NO931974L true NO931974L (no) 1993-12-02

Family

ID=27128985

Family Applications (1)

Application Number Title Priority Date Filing Date
NO931974A NO931974L (no) 1992-06-01 1993-05-28 System til komprimering av audiodata

Country Status (8)

Country Link
US (1) US5495555A (no)
EP (1) EP0573398B1 (no)
JP (1) JPH0736118B2 (no)
AT (1) ATE174146T1 (no)
CA (1) CA2096991C (no)
DE (1) DE69322313T2 (no)
FI (1) FI932465A (no)
NO (1) NO931974L (no)

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Also Published As

Publication number Publication date
EP0573398B1 (en) 1998-12-02
NO931974D0 (no) 1993-05-28
JPH0736118B2 (ja) 1995-04-19
ATE174146T1 (de) 1998-12-15
CA2096991A1 (en) 1993-12-02
CA2096991C (en) 1997-03-18
JPH0635500A (ja) 1994-02-10
DE69322313T2 (de) 1999-07-01
FI932465A (fi) 1993-12-02
EP0573398A2 (en) 1993-12-08
US5495555A (en) 1996-02-27
DE69322313D1 (de) 1999-01-14
FI932465A0 (fi) 1993-05-28
EP0573398A3 (no) 1994-02-16

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