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KR960036345A - Low-Delay Variable-rate Multiple-Excitation Speech Coder - Google Patents

Low-Delay Variable-rate Multiple-Excitation Speech Coder Download PDF

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KR960036345A
KR960036345A KR1019950005980A KR19950005980A KR960036345A KR 960036345 A KR960036345 A KR 960036345A KR 1019950005980 A KR1019950005980 A KR 1019950005980A KR 19950005980 A KR19950005980 A KR 19950005980A KR 960036345 A KR960036345 A KR 960036345A
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pitch
value
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voiced
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KR0155807B1 (en
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기석철
김남수
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김광호
삼성전자 주식회사
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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
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • 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

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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)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

입력 음성 신호에 대해서 낮은 전송률과 짧은 시간 지연을 보장하는 음성 부호화 장치가 개시된다. 본 발명에 따른 음성부호화장치는 초기피치 추정시 룩-어헤드 피치 추정과정을 제거함에 의해 분석시의 지연 시간을 2 프레임 시간만큼 단축할 수 있으며 또한 그만큼 계산량도 감축할 수가 있게 된다.Disclosed is a speech encoding apparatus that guarantees a low data rate and a short time delay for an input speech signal. The speech coding apparatus according to the present invention can reduce the delay time for analysis by 2 frame time by eliminating the look-ahead pitch estimation process during the initial pitch estimation, and also reduce the amount of computation.

Description

저지연 가변 전송률 다중여기 음성 부호화장치Low-Delay Variable-rate Multiple-Excitation Speech Coder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제4도는 본 발명에 따른 개선된 음성부호화장치의 구성을 보이는 블럭도이다.4 is a block diagram showing the configuration of an improved speech encoding apparatus according to the present invention.

Claims (4)

각 프레임에 대한 에러함수값이 최소가 되는 피치값을 결정하는 초기 피치추정부, 초기피치을 참조하여 최종피치 추정값을 결정하는 피치정제부, 현재 프레임의 피치를 참조하여 주파수밴드의 유/무성음판별을 행하고 비트 할당을 하는 유무성음 검출부, 그리고 각 주파수밴드의 스펙트럼의 크기를 구하는 스펙트럼 앰플리튜드 추정부를 구비하는 저지연 가변 전송률 다중 여기 음성 부호화 장치에 있어서, 상기 초기피치 추정부는 주어진 피치값에 따른 오차값을 구하는 에러함수 계산부, 현재로부터 과거의 피치값에 대한 에러 함수가 최소가 되도록하는 룩-백피치 추정부, 그리고 피치값을 에러 함수의 입력으로 줄때 유성음 프레임에서는 작은 값을 이용하고, 무성음 프레임에서는 큰 값을 이용하는 규칙을 갖는 피치결정부를 구비하고, 상기 유/무성음 검출부는 프레임 단위로 유무성음 구간을 판별하며, 무성음 프레임의 경우 비트 할당을 적게하여 전송하도록 하는 것을 특징으로 하는 저지연 가변전송률 다중 여기 음성 부호화 방법.Initial pitch estimation for determining the pitch value that minimizes the error function value for each frame, Pitch refiner for determining the final pitch estimate with reference to the initial pitch, and Voice / silent sound discrimination of frequency bands with reference to the pitch of the current frame. In the low-delay variable-rate multi-excitation speech encoding apparatus having a voiced speech detection section for performing bit allocation and a spectral amplifier estimation section for obtaining the magnitude of the spectrum of each frequency band, the initial pitch estimator includes an error value according to a given pitch value. An error function calculation unit that calculates, a look-back pitch estimator that minimizes the error function from the present to the past pitch value, and a small value is used in the voiced frame when the pitch value is input to the error function. Is provided with a pitch determination unit having a rule using a large value, and Sound detection portion, and determines the presence or absence voicing section frame by frame, in the case of unvoiced frames, low-latency, characterized in that to transmit to reduce the bit allocation, a variable bit rate speech coding method where multiple. 제1항에 있어서, 상기 피치결정부는 이전 프레임에서의 에러 함수값 E(P-i)이 큰 값이면, 이전 프레임은 무성음으로 간주되고 현재의 프레임은 새로운 유성음 구간이 시작될 가능성이 있다고 판단하여 가능한 모든 피치값에서 초기 피치값 Pi을을 결정하며, 반면에 이전 프레임에서의 에러함수값 E(P-i)이 작으면 이전 프레임은 유성음으로 간주하고 현재의 프레임도 유성음일 가능성이 크다고 판단하여 피치후보 범위를 제한하여 초기 피치값 Pi을 결정하는 것을 특징으로 하는 저지연 가변전송률 다중 여기 음성 부호화장치.2. The pitch determination unit of claim 1, wherein if the error function value E (Pi) in the previous frame is a large value, all pitches are determined by determining that the previous frame is considered to be unvoiced and the current frame is likely to start a new voiced section. The initial pitch value P i is determined from the value. On the other hand, if the error function value E (P- i ) in the previous frame is small, the previous frame is considered voiced and the current frame is likely to be voiced. A low delay variable bit rate multiple excitation speech encoding apparatus characterized by determining an initial pitch value Pi by limiting a range. 제1항에 있어서, 상기 프레임 유/무성음 판별부는 모든 주파수 밴드가 무성음이면 현재 프레임은무성음이며, 밴드1을 제외한 모든 밴드가 무성음일때, ER1 〈 0.06 or ER2 〈0.08 이면 현재 프레임은무성음이면 ER1 〈 10 or ER2 〈10 이면 현재 프레임은 유성음인 것을 특징으로 하는 저지연 가변전송를 다중 여기 음성 부호화장치.The method according to claim 1, wherein the frame voice / unvoice discrimination unit is an unvoiced sound when all frequency bands are unvoiced, and when all bands except band 1 are unvoiced, when ER1 < 0.06 or ER2 < 0.08, if the current frame is unvoiced, ER1 < 10 or ER2 < 10, the present frame is voiced sound, low delay variable transmission multiple excitation speech encoding apparatus. 제3항에 있어서, 상기 프레임 유/무성음 판별부에서 판별된 프레임이 무성음쪽의 특성이 강한 프레임일 경우 키트할당을 적게하여 전송하는 것을 특징으로 하는 저지연 가변전송률 다중 여기 음성부호화 장치.The low delay variable bit rate multiple excitation speech encoding apparatus of claim 3, wherein the frame rate determined by the frame speech / unvoiced sound discriminator is transmitted with less kit allocation when the frame has a strong characteristic of unvoiced sound. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950005980A 1995-03-21 1995-03-21 Multi-band-voice coder Expired - Fee Related KR0155807B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950005980A KR0155807B1 (en) 1995-03-21 1995-03-21 Multi-band-voice coder

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Application Number Priority Date Filing Date Title
KR1019950005980A KR0155807B1 (en) 1995-03-21 1995-03-21 Multi-band-voice coder

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KR960036345A true KR960036345A (en) 1996-10-28
KR0155807B1 KR0155807B1 (en) 1998-12-15

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