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KR950035134A - 프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법 - Google Patents

프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법 Download PDF

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Publication number
KR950035134A
KR950035134A KR1019950005090A KR19950005090A KR950035134A KR 950035134 A KR950035134 A KR 950035134A KR 1019950005090 A KR1019950005090 A KR 1019950005090A KR 19950005090 A KR19950005090 A KR 19950005090A KR 950035134 A KR950035134 A KR 950035134A
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South Korea
Prior art keywords
linear prediction
frame
during
prediction filter
coefficient signal
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KR1019950005090A
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English (en)
Inventor
크룬 피터
Original Assignee
토마스 에이. 레스타이노
에이티앤드티 코포레이션
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Publication of KR950035134A publication Critical patent/KR950035134A/ko

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    • 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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • 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
    • G10L19/08—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 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
    • G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0012—Smoothing of parameters of the decoder interpolation

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  • 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)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

본 발명은 프레임 소거(또는 패킷 손실)에 대한 음성 코딩 시스템 로버스트에 대해 기술한다. 예시적인 실시예가 CCITT 표준 G.728의 변경된 변형을 통제한다. 프레임 소거시, 여기 신호의 벡터는 비소거 프레임동안 발생되는 사전 저장된 여기 신호 벡터에 입각하여 합성된다. 이러한 합성은 유성음 및 비유성음에 대해 다르다. 소거된 프레임동안, 선형 예측 필터 계수는 비소거된 프레임동안 결정되는 선형 예측 필터 계수의 세트된 주파수 보정된 외삽법에 의해 합성된다. 계수 인자는 1보다 작은 수이다. 이러한 주파수 보정 인자는 선형 예측 필터의 주파수 응답에 의해 피크치의 대역폭 확장을 성취한다. 소거된 프레임동안 계산의 복잡성은 비소거된 프레임동안에만 필요한 소정 계산의 소거를 통해 감소된다. 계산의 복잡성을 감소시키는 것은 여기 신호 합성과 소거된 프레임동안 선형 예측 필터 계수를 위해 추가적인 계산을 상쇄시킨다.

Description

프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명에 따라 변경된 G.728 디코더의 블럭도, 제2도는 본 발명에 따라 제1도의 예시적인 여기 합성기의 블럭도, 제3도는 제2도의 여기 합성 프로세서의 합성 모드 동작의 블럭-흐름도, 제4도는 제2도의 여기 합성 프로세서의 다른 합성 모드 동작의 블럭-흐름도, 제5도는 제1도의 대역폭 확장기에 의해 수행되는 LPC 파라미터 대역폭 확장의 블럭-흐름도, 제6도는 제1도의 합성 필터 어댑터에 의해 수행되는 신호 처리의 블럭도, 제7도는 제1도 벡터 이득 어댑터에 의해 수행되는 신호 처리의 블럭도, 제8도 및 제9도는 G.728에 대한 LPC 합성 필터어댑터 및 벡터 이득 어댑터의 변경된 변형을 각각 나타내는 도면, 제10도 및 제11도는 LPC 필터 주파수 응답 및 동일한 대역폭-확장 변형을 각각 나타내는 도면, 제12도는 본 발명에 따른 예시적인 무선 통신 시스템을 나타내는 도면.

Claims (2)

  1. 프레임 소거동안 선형 예측 필터 계수 신호와, 음성 신호를 합성할 때 선형 예측 필터에 의해 사용하기위한 상기 발생된 선형 예측 계수 신호를 발생하는 방법에 있어서, 비소거 프레임에 대응하는 음성 신호에 응답하여 발생되는 상기 선형 예측 계수 신호를 메모리내에 저장하는 단계와; 프레임 소거에 응답하여, 상기 선형 예측 필터의 주파수 응답에 의해 하나 이상의 피크치의 상기 대역폭을 확장시키기 위해 상기 저장된 선형 예측 계수 신호를 변경하는 단계를 포함하며, 상기 변경된 선형 예측 계수 신호는 상기 음성 신호를 합성하는데 사용하기 위해 상기 선형 예측 필터에 인가되는 프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법.
  2. 제1항에 있어서, 상기 저장된 선형 예측 계수 신호를 변경하는 단계는 지수적으로 상승되는 스케일 인자에 의해 하나 이상의 상기 저장된 선형 예측 계수 신호를 스케일링하는 단계와, 상기 스케일 인자는 1보다 작으며 상기 지수는 상기 저장된 선형 예측 계수를 색인하는 단계를 포함하는 프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019950005090A 1994-03-14 1995-03-13 프레임 소거동안 선형 예측 필터 계수 신호를 발생하는 방법 KR950035134A (ko)

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US08/212,440 US5450449A (en) 1994-03-14 1994-03-14 Linear prediction coefficient generation during frame erasure or packet loss
US8/212,440 1994-03-14

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KR950035134A true KR950035134A (ko) 1995-12-30

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US (1) US5450449A (ko)
EP (1) EP0673016A3 (ko)
JP (1) JPH07311598A (ko)
KR (1) KR950035134A (ko)
AU (1) AU683127B2 (ko)
CA (1) CA2142392C (ko)

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AU1367695A (en) 1995-09-21
JPH07311598A (ja) 1995-11-28
EP0673016A3 (en) 1997-08-06
US5450449A (en) 1995-09-12
CA2142392C (en) 1998-10-06
EP0673016A2 (en) 1995-09-20
CA2142392A1 (en) 1995-09-15
AU683127B2 (en) 1997-10-30

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