HK1055833A1 - Closed-loop multimode mixed-domain linear prediction speech coder and method of processing frames - Google Patents

Closed-loop multimode mixed-domain linear prediction speech coder and method of processing frames

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Publication number
HK1055833A1
HK1055833A1 HK03108074A HK03108074A HK1055833A1 HK 1055833 A1 HK1055833 A1 HK 1055833A1 HK 03108074 A HK03108074 A HK 03108074A HK 03108074 A HK03108074 A HK 03108074A HK 1055833 A1 HK1055833 A1 HK 1055833A1
Authority
HK
Hong Kong
Prior art keywords
coding mode
encoded
speech
domain coding
speech frame
Prior art date
Application number
HK03108074A
Inventor
Amitava Das
Original Assignee
Qualcomm Inc
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 Qualcomm Inc filed Critical Qualcomm Inc
Publication of HK1055833A1 publication Critical patent/HK1055833A1/en

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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
    • 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

Abstract

A closed-loop, multimode, mixed-domain linear prediction (MDLP) speech coder includes a high-rate, time-domain coding mode, a low-rate, frequency-domain coding mode, and a closed-loop mode-selection mechanism for selecting a coding mode for the coder based upon the speech content of frames input to the coder. Transition speech (i.e., from unvoiced speech to voiced speech, or vice versa) frames are encoded with the high-rate, time-domain coding mode, which may be a CELP coding mode. Voiced speech frames are encoded with the low-rate, frequency-domain coding mode, which may be a harmonic coding mode. Phase parameters are not encoded by the frequency-domain coding mode, and are instead modeled in accordance with, e.g., a quadratic phase model. For each speech frame encoded with the frequency-domain coding mode, the initial phase value is taken to be the initial phase value of the immediately preceding speech frame encoded with the frequency-domain coding mode. If the immediately preceding speech frame was encoded with the time-domain coding mode, the initial phase value of the current speech frame is computed from the decoded speech frame information of the immediately preceding, time-domain-encoded speech frame. Each speech frame encoded with the frequency-domain coding mode may be compared with the corresponding input speech frame to obtain a performance measure. If the performance measure falls below a predefined threshold value, the input speech frame is encoded with the time-domain coding mode.
HK03108074A 2000-02-29 2003-11-07 Closed-loop multimode mixed-domain linear prediction speech coder and method of processing frames HK1055833A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/005140 WO2001065544A1 (en) 2000-02-29 2000-02-29 Closed-loop multimode mixed-domain linear prediction speech coder

Publications (1)

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HK1055833A1 true HK1055833A1 (en) 2004-01-21

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EP (1) EP1259957B1 (en)
JP (1) JP4907826B2 (en)
KR (1) KR100711047B1 (en)
CN (1) CN1266674C (en)
AT (1) ATE341074T1 (en)
AU (1) AU2000233851A1 (en)
DE (1) DE60031002T2 (en)
ES (1) ES2269112T3 (en)
HK (1) HK1055833A1 (en)
WO (1) WO2001065544A1 (en)

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Also Published As

Publication number Publication date
KR100711047B1 (en) 2007-04-24
EP1259957B1 (en) 2006-09-27
WO2001065544A1 (en) 2001-09-07
AU2000233851A1 (en) 2001-09-12
JP2003525473A (en) 2003-08-26
EP1259957A1 (en) 2002-11-27
CN1437747A (en) 2003-08-20
DE60031002D1 (en) 2006-11-09
JP4907826B2 (en) 2012-04-04
DE60031002T2 (en) 2007-05-10
CN1266674C (en) 2006-07-26
ATE341074T1 (en) 2006-10-15
ES2269112T3 (en) 2007-04-01
KR20020081374A (en) 2002-10-26

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