JP2008090311A5 - - Google Patents

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JP2008090311A5
JP2008090311A5 JP2007265301A JP2007265301A JP2008090311A5 JP 2008090311 A5 JP2008090311 A5 JP 2008090311A5 JP 2007265301 A JP2007265301 A JP 2007265301A JP 2007265301 A JP2007265301 A JP 2007265301A JP 2008090311 A5 JP2008090311 A5 JP 2008090311A5
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code
code vector
adaptive
speech
decoding
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符号駆動線形予測（Ｃｏｄｅ−Ｅｘｃｉｔｅｄ Ｌｉｎｅａｒ Ｐｒｅｄｉｃｔｉｏｎ：ＣＥＬＰ）によって、線形予測パラメータ符号、適応符号およびゲイン符号を含む音声符号を復号する音声復号化方法において、In a speech decoding method for decoding a speech code including a linear prediction parameter code, an adaptive code, and a gain code by code-driven linear prediction (CELP),
前記線形予測パラメータ符号を復号して線形予測パラメータを得るステップと、Decoding the linear prediction parameter code to obtain a linear prediction parameter;
適応符号帳から前記適応符号に対応する適応符号ベクトルを復号区間について得るステップと、Obtaining an adaptive code vector corresponding to the adaptive code from the adaptive codebook for a decoding interval;
前記ゲイン符号を復号して、前記適応符号ベクトルおよび駆動符号ベクトルのゲインを得るステップと、Decoding the gain code to obtain gains of the adaptive code vector and the drive code vector;
前記適応符号ベクトルのゲインに基づいて、前記復号区間について前記音声符号に関する雑音の度合いを評価するステップと、Evaluating the degree of noise related to the speech code for the decoding interval based on the gain of the adaptive code vector;
当該評価された雑音の度合いと駆動符号帳とに基づいて駆動符号ベクトルを得るステップと、Obtaining a driving code vector based on the evaluated degree of noise and the driving codebook;
前記適応符号ベクトルと前記駆動符号ベクトルとを前記復号された適応符号ベクトルのゲイン及び駆動符号ベクトルのゲインを用いてそれぞれ重みづけるステップと、Weighting the adaptive code vector and the driving code vector with the decoded adaptive code vector gain and the driving code vector gain, respectively;
前記重み付けられた適応符号ベクトルと駆動符号ベクトルとを加算して駆動音源信号を得るステップと、Adding the weighted adaptive code vector and the drive code vector to obtain a drive excitation signal;
前記駆動音源信号と前記線形予測パラメータとを用いて音声を合成するステップとSynthesizing speech using the driving sound source signal and the linear prediction parameter;
を有することを特徴とする音声復号化方法。A speech decoding method characterized by comprising: 符号駆動線形予測（Ｃｏｄｅ−Ｅｘｃｉｔｅｄ Ｌｉｎｅａｒ Ｐｒｅｄｉｃｔｉｏｎ：ＣＥＬＰ）によって、線形予測パラメータ符号、適応符号およびゲイン符号を含む音声符号を復号する音声復号化装置において、In a speech decoding apparatus that decodes speech codes including a linear prediction parameter code, an adaptive code, and a gain code by code-driven linear prediction (CELP),
前記線形予測パラメータ符号を復号して線形予測パラメータを得る手段と、Means for decoding the linear prediction parameter code to obtain a linear prediction parameter;
適応符号帳から前記適応符号に対応する適応符号ベクトルを復号区間について得る手段と、Means for obtaining an adaptive code vector corresponding to the adaptive code from the adaptive codebook for a decoding interval;
前記ゲイン符号を復号して、前記適応符号ベクトルおよび駆動符号ベクトルのゲインを得る手段と、Means for decoding the gain code to obtain gains of the adaptive code vector and the drive code vector;
前記適応符号ベクトルのゲインに基づいて、前記復号区間について前記音声符号に関する雑音の度合いを評価する手段と、Means for evaluating the degree of noise related to the speech code for the decoding interval based on the gain of the adaptive code vector;
当該評価された雑音の度合いと駆動符号帳とに基づいて駆動符号ベクトルを得る手段と、Means for obtaining a drive code vector based on the evaluated noise level and the drive codebook;
前記適応符号ベクトルと前記駆動符号ベクトルとを前記復号された適応符号ベクトルのゲイン及び駆動符号ベクトルのゲインを用いてそれぞれ重みづける手段と、Means for respectively weighting the adaptive code vector and the driving code vector using the decoded adaptive code vector gain and the driving code vector gain;
前記重み付けられた適応符号ベクトルと駆動符号ベクトルとを加算して駆動音源信号を得る手段と、Means for adding the weighted adaptive code vector and the drive code vector to obtain a drive excitation signal;
前記駆動音源信号と前記線形予測パラメータとを用いて音声を合成する手段とMeans for synthesizing speech using the driving sound source signal and the linear prediction parameter;
を有することを特徴とする音声復号化装置。A speech decoding apparatus comprising: 符号駆動線形予測（Ｃｏｄｅ−Ｅｘｃｉｔｅｄ Ｌｉｎｅａｒ Ｐｒｅｄｉｃｔｉｏｎ：ＣＥＬＰ）によって、音声符号を復号する音声復号化方法において、In a speech decoding method for decoding a speech code by code-driven linear prediction (CELP),
適応符号帳から適応符号ベクトルを得るステップと、Obtaining an adaptive code vector from the adaptive codebook;
前記音声符号の一部を用いて、雑音の度合いを評価するステップと、Using a portion of the speech code to evaluate the degree of noise;
前記評価された雑音の度合いに基づいて駆動符号ベクトルを得るステップと、Obtaining a driving code vector based on the estimated degree of noise;
前記駆動符号ベクトルと前記適応符号ベクトルとに基づいて音声を合成するステップとSynthesizing speech based on the drive code vector and the adaptive code vector;
を有することを特徴とする音声復号化方法。A speech decoding method characterized by comprising:
JP2007265301A 1997-12-24 2007-10-11 Speech decoding method and speech decoding apparatus Expired - Lifetime JP4800285B2 (en)

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JP2007265301A JP4800285B2 (en) 1997-12-24 2007-10-11 Speech decoding method and speech decoding apparatus

Applications Claiming Priority (3)

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JP1997354754 1997-12-24
JP35475497 1997-12-24
JP2007265301A JP4800285B2 (en) 1997-12-24 2007-10-11 Speech decoding method and speech decoding apparatus

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JP2004372545A Division JP4170288B2 (en) 1997-12-24 2004-12-24 Speech coding method and speech coding apparatus

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JP2009018916A Division JP4916521B2 (en) 1997-12-24 2009-01-30 Speech decoding method, speech encoding method, speech decoding apparatus, and speech encoding apparatus

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JP2008090311A JP2008090311A (en) 2008-04-17
JP2008090311A5 true JP2008090311A5 (en) 2009-03-05
JP4800285B2 JP4800285B2 (en) 2011-10-26

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KR101610765B1 (en) 2008-10-31 2016-04-11 삼성전자주식회사 Method and apparatus for encoding/decoding speech signal
JP5376635B2 (en) * 2009-01-07 2013-12-25 国立大学法人 奈良先端科学技術大学院大学 Noise suppression processing selection device, noise suppression device, and program

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JP2906596B2 (en) * 1990-06-28 1999-06-21 松下電器産業株式会社 Audio coding device
JP2776050B2 (en) * 1991-02-26 1998-07-16 日本電気株式会社 Audio coding method
JPH05265496A (en) * 1992-03-18 1993-10-15 Hitachi Ltd Speech encoding method with plural code books
JPH0869298A (en) * 1994-08-29 1996-03-12 Olympus Optical Co Ltd Reproducing device

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