KR970055609A - Pitch search method of CLP encoder - Google Patents

Pitch search method of CLP encoder Download PDF

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Publication number
KR970055609A
KR970055609A KR1019950055071A KR19950055071A KR970055609A KR 970055609 A KR970055609 A KR 970055609A KR 1019950055071 A KR1019950055071 A KR 1019950055071A KR 19950055071 A KR19950055071 A KR 19950055071A KR 970055609 A KR970055609 A KR 970055609A
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KR
South Korea
Prior art keywords
pitch
pitch search
encoder
clp
present
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KR1019950055071A
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Korean (ko)
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이근춘
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구자홍
Lg 전자주식회사
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Priority to KR1019950055071A priority Critical patent/KR970055609A/en
Publication of KR970055609A publication Critical patent/KR970055609A/en

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Abstract

본 발명은 음성신호를 압출하여 전송하거나 메모리에 저장하기 위한 음성 부호와 방법에 관한 것으로서 특히 씨이엘피(CELP;Code Excited Linear Prediction, 코드 여기선형 예측)부호화기에 의한 부호화 방법에서 음성 피치(Pitch)의 검색 시간을 단축할 수 있도록 한 씨이엘피(CELP)부호화기의 피치(Pitch) 검색방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speech code and a method for extruding a speech signal or to store it in a memory. Particularly, the present invention relates to a speech pitch in a coding method by a CELP (Code Excited Linear Prediction) encoder. The present invention relates to a pitch search method of a CLP encoder which can shorten the search time.

종래의 씨이엘피(CELP)부호화기의 피치(Pitch)검색방법에 의하면 상기한 바와같이 Dmin부터 Dmax까지 상기 (식4)의 우변우항에 대항하는 계산을 반복적으로 수행하고 그 중에서 최적의 피치값(D)을 선정해야 하므로 많은 연산을 필요로 하는 문제점과 이로 인한 계산량 및 계산 시간의 증가 및 피치 검색시간의 증가가 초래되었던 것이다.According to the conventional pitch search method of the CELP encoder, as described above, the calculation for the right side term of Equation 4 is repeatedly performed from Dmin to Dmax, and the optimal pitch value D ), Many computations are required, resulting in increased computation and computation time, and increased pitch search time.

본 발명은 상기한 바와같은 종래의 문제점을 해결하기 위하여 원 음성신호로부터 잉여(Residual)신호(δ(n))를 구하는 단계와; 상기 단계에서 구한 잉여신호값(δ(n))중에서 일정 수준 이상의 피크(peak)값을 선택하는 단계와;상기 단계에서 선택된 피크 샘플들의 위치를 계산하는 단계와;상기 단계에서 계산된 샘플 주변소정의 범위 이내로 한정하여 피치 검색 계산을 수행하는 단계;로 이루어짐을 특징으로 하는 씨이엘피(CELP)부호화기의 피치(Pitch) 검색 방법으로서 피치 검색 구간을 피치값으로 예상되는 구간의 값으로 한정하여 피치 검색을 수행함으로써 씨이엘피(CELP)부호화기의 피치(Pitch) 검색시간과 계산량을 줄일 수 있도록 한다.The present invention comprises the steps of: obtaining a residual signal? (N) from the original audio signal to solve the conventional problems as described above; Selecting a peak value of a predetermined level or more among the excess signal values δ (n) obtained in the step; calculating a position of the peak samples selected in the step; A step of performing a pitch search calculation to be limited to within the range of; Pitch search method of a CLP encoder characterized in that consisting of a pitch search by limiting the pitch search interval to the value of the interval expected to pitch value It is possible to reduce the pitch search time and the calculation amount of the CLP encoder.

Description

씨이엘피(CELP)부호화기의 피치(Pitch) 검색방법Pitch search method of CLP encoder

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

제3도는 본 발명의 씨이엘피(CELP)부호화기의 피치(Pitch) 검색방법의 블록도.3 is a block diagram of a pitch search method of a CELP encoder of the present invention.

제4도는 본 발명에서 피치가 정확한 유성음인 경우의 신호 파형도.4 is a signal waveform diagram when the pitch is accurate voiced sound in the present invention.

Claims (3)

원 음성신호로부터 잉여(Residual)신호(δ(n))를 구하는 단계와; 상기 단계에서 구한 잉여신호값(δ(n))중에서 일정 수준 이상의 피크(peak)값을 선택하는 단계와;상기 단계에서 선택된 피크 샘플들의 위치를 계산하는 단계와;상기 단계에서 계산된 샘플 주변소정의 범위 이내로 한정하여 피치 검색 계산을 수행하는 단계;로 이루어짐을 특징으로 하는 씨이엘피(CELP)부호화기의 피치(Pitch) 검색 방법.Obtaining a residual signal? (N) from the original audio signal; Selecting a peak value of a predetermined level or more among the excess signal values δ (n) obtained in the step; calculating a position of the peak samples selected in the step; Performing a pitch search calculation to be limited to within the range of the; 제1항에 있어서 상기 피치 검색구간은 상기 선택된 피크 샘플위치로부터 ±α로 정해지는 구간으로 제한함을 특징으로 하는 씨이엘피(CELP)부호화기의 피치(Pitch) 검색 방법.The pitch search method of claim 1, wherein the pitch search section is limited to a section defined by ± α from the selected peak sample position. 제1항에 있어서 상기의 피치검색구간은 상기 일정 수준을 넘어서는 모든 잉여신호(δ(n))의 샘플위치에 대하여 ±α 구간만큼 수행함을 특징으로 하는 씨이엘피(CELP)부호화기의 피치(Pitch) 검색 방법.The pitch of the LPLP encoder as set forth in claim 1, wherein the pitch search interval is performed by ± α intervals for the sample positions of all the excess signals δ (n) exceeding the predetermined level. Search method. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950055071A 1995-12-22 1995-12-22 Pitch search method of CLP encoder KR970055609A (en)

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KR1019950055071A KR970055609A (en) 1995-12-22 1995-12-22 Pitch search method of CLP encoder

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KR1019950055071A KR970055609A (en) 1995-12-22 1995-12-22 Pitch search method of CLP encoder

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KR970055609A true KR970055609A (en) 1997-07-31

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