KR970013777A - Noise Codebook Method for Linear Predictive Coding - Google Patents

Noise Codebook Method for Linear Predictive Coding Download PDF

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Publication number
KR970013777A
KR970013777A KR1019950026591A KR19950026591A KR970013777A KR 970013777 A KR970013777 A KR 970013777A KR 1019950026591 A KR1019950026591 A KR 1019950026591A KR 19950026591 A KR19950026591 A KR 19950026591A KR 970013777 A KR970013777 A KR 970013777A
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South Korea
Prior art keywords
generating
noise codebook
information
signal
noise
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KR1019950026591A
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Korean (ko)
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KR100346732B1 (en
Inventor
김흥국
하남규
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김광호
삼성전자 주식회사
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Priority to KR1019950026591A priority Critical patent/KR100346732B1/en
Publication of KR970013777A publication Critical patent/KR970013777A/en
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Publication of KR100346732B1 publication Critical patent/KR100346732B1/en

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    • 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
    • G10L19/125—Pitch excitation, e.g. pitch synchronous innovation CELP [PSI-CELP]
    • 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
    • G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/028—Noise substitution, i.e. substituting non-tonal spectral components by noisy source
    • 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
    • G10L2019/0007—Codebook element generation

Abstract

음성의 피치정보와 포만트정보를 이용하여 음성의 여기신호를 모델링하는 선형예측 부화화방법에 관한 것으로 더욱 상세하게는 음성의 피치정보와 포만트정보를 이용하여 펄스열을 생성하고 이를 이용하여 잡음코드북을 작성하는 방법이 개시된다. 본 발명에 다른 잡음코드북의 작성방법은 음성신호의 피치정보 및 포만트정보에 근거하는 펄스열을 생성하는 과정; 상기 펄스열과 잡음신호를 합성하고, 합성된 신호에 의해 잡음코드북을 작성하는 과정; 및 상기 작성된 잡음코드북을 사용하여 상기 잔차신호를 부호화하는 과정을 포함함을 특징으로 한다. 본 발명에 따른 잡음코드북 작성방법은 음성에서 피치와 포트만정보를 추출하여 펄스열을 만들고, 이로부터 잡음코드북을 작성하기 때문에 기존의 CELP에 비해 고품질의 음성을 합성할 수 있게 함과 동시에 코드북의 크기를 줄일수 있는 효과가 있다.A linear predictive incubation method for modeling an excitation signal of speech using pitch information and formant information of speech. More specifically, a noise codebook is generated by generating a pulse train using speech pitch information and formant information. A method of writing is disclosed. According to another aspect of the present invention, there is provided a method of generating a noise codebook, comprising: generating a pulse string based on pitch information and formant information of a voice signal; Synthesizing the pulse train and the noise signal, and generating a noise codebook based on the synthesized signal; And encoding the residual signal using the prepared noise codebook. The noise codebook preparation method according to the present invention extracts the pitch and portman information from the speech to make a pulse sequence, and creates a noise codebook from the speech code. It can reduce the effect.

Description

선형에측 부호화방법의 잡음코드북 작성방법.A noise codebook writing method of the linear prediction method.

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제5도는 본 발명에 따른 잡음코드북 작성방법을 적용한 새로운 코드여기 선형예측 부호화방법을 보이는 흐름도이다.5 is a flowchart showing a new code excitation linear prediction coding method applying the noise codebook generating method according to the present invention.

제6도는 제5도에 도시된 부호화과정에 대응되는 복호화과정을 보이는 도면이다.6 is a diagram illustrating a decoding process corresponding to the encoding process illustrated in FIG. 5.

제7도는 추출된 포만트의 일에를 보이는 도면이다.7 is a view showing the work of the extracted formants.

Claims (3)

음성신호를 주기성분과 잔차성분으로 나누어 부호화하는 선형예측 부호화방법에 있어서, 상기 잔차성분을 부호화하기 위한 잡음코드북을 작성하는 과정은 음성신호의 피치정보 및 포만트정보에 근거하는 펄스열을 생성하는 과정; 상기 펄스열과 잡음신호를 합성하고, 합성된 신호에 의해 잡음코드북을 작성하는 과정; 및 상기 작성된 잡음 코드북을 사용하여 상기 잔차신호를 부호화하는 과정을 포함하는 선형예측 부호화방법의 잡음코드북 작성방법.In the linear predictive encoding method of dividing a speech signal into a periodic component and a residual component, the noise codebook for encoding the residual component is generated by generating a pulse string based on pitch information and formant information of the speech signal. ; Synthesizing the pulse train and the noise signal, and generating a noise codebook based on the synthesized signal; And encoding the residual signal using the generated noise codebook. 제1항에 있어서, 상기 펄스열을 생성하는 과정은 피치주파수와 포만트주파수의 배수관계에 근거하여 펄스의 크기를 구하는 과정; 상기 구해진 펄스크기를 이용하여 펄스열을 생성하는 과정을 포함함을 특징으로 하는 선형예측 부호화방법의 잡음코드북 작성방법.The method of claim 1, wherein the generating of the pulse train comprises: calculating a magnitude of a pulse based on a multiple relationship between a pitch frequency and a formant frequency; And a step of generating a pulse train using the obtained pulse size. 제1항에 있어서, 상기 펄스열을 프레임주기로 작성됨을 특징으로 하는 선형예측 부화화 방법의 잡음코드 작성방법.The noise code generating method of claim 1, wherein the pulse train is prepared at a frame period. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950026591A 1995-08-25 1995-08-25 Noise code book preparation and linear prediction coding/decoding method using noise code book and apparatus therefor KR100346732B1 (en)

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KR1019950026591A KR100346732B1 (en) 1995-08-25 1995-08-25 Noise code book preparation and linear prediction coding/decoding method using noise code book and apparatus therefor

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KR1019950026591A KR100346732B1 (en) 1995-08-25 1995-08-25 Noise code book preparation and linear prediction coding/decoding method using noise code book and apparatus therefor

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KR970013777A true KR970013777A (en) 1997-03-29
KR100346732B1 KR100346732B1 (en) 2002-11-30

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