JP6018724B2 - 線形予測係数変換装置および線形予測係数変換方法 - Google Patents
線形予測係数変換装置および線形予測係数変換方法 Download PDFInfo
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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
- G10L19/26—Pre-filtering or post-filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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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
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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
- G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
-
- 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
-
- 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
- G10L19/13—Residual excited linear prediction [RELP]
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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
- G10L19/16—Vocoder architecture
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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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/12—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being prediction coefficients
Description
前記実施例におけるステップS001およびS011においては、式(20)、(21)を用いて多項式R(x)とS(x)の係数を計算しているが、線形予測係数から求めることができる式(9)および(10)の多項式の係数を利用して計算をしてもよい。また、LSP係数、ISP係数から線形予測係数に変換することもできる。
Claims (6)
- 第一の標本化周波数により算出された第一の線形予測係数を前記第一の標本化周波数とは異なる第二の標本化周波数の第二の線形予測係数に変換する装置であって、
前記第一の線形予測係数もしくはその等価なパラメータに基づき前記第二の標本化周波数における前記第二の線形予測係数に対応するパワスペクトルを単位円の実軸上で計算する手段と、
前記パワスペクトルから自己相関係数を単位円の実軸上で計算する手段と、
前記自己相関係数を前記第二の標本化周波数の前記第二の線形予測係数に変換する手段と、
を備える線形予測係数変換装置。 - 前記第一の標本化周波数をF1、前記第二の標本化周波数をF2とした場合(ただしF1<F2)、N1=1+(F1/F2)(N2+1)なるN1個の異なる周波数に対応する実軸上の点で、前記第一の線形予測係数を用いてパワスペクトルを求め、N2−N1個のパワスペクトル成分は、前記第一の線形予測係数を用いて計算した前記パワスペクトルを外挿することにより、前記第二の線形予測係数に対応する前記パワスペクトルを求める、請求項1に記載の線形予測係数変換装置。
- 前記第一の標本化周波数をF1、前記第二の標本化周波数をF2とした場合(ただしF1>F2)、N1=1+(F1/F2)(N2+1)なるN1個の異なる周波数に対応する実軸上の点で、前記第一の線形予測係数を用いてパワスペクトルを求めることにより、前記第二の線形予測係数に対応する前記パワスペクトルを求める、請求項1に記載の線形予測係数変換装置。
- 第一の標本化周波数により算出された第一の線形予測係数を前記第一の標本化周波数とは異なる第二の標本化周波数の第二の線形予測係数に変換する装置により実行される線形予測係数変換方法であって、
前記第一の線形予測係数もしくはその等価なパラメータに基づき前記第二の標本化周波数における前記第二の線形予測係数に対応するパワスペクトルを単位円の実軸上で計算するステップと、
前記パワスペクトルから自己相関係数を単位円の実軸上で計算するステップと、
前記自己相関係数を前記第二の標本化周波数の前記第二の線形予測係数に変換するステップと、
を含む線形予測係数変換方法。 - 前記第一の標本化周波数をF1、前記第二の標本化周波数をF2とした場合(ただしF1<F2)、N1=1+(F1/F2)(N2+1)なるN1個の異なる周波数に対応する実軸上の点で、前記第一の線形予測係数を用いてパワスペクトルを求め、N2−N1個のパワスペクトル成分は、前記第一の線形予測係数を用いて計算した前記パワスペクトルを外挿することにより、前記第二の線形予測係数に対応する前記パワスペクトルを求める、請求項4に記載の線形予測係数変換方法。
- 前記第一の標本化周波数をF1、前記第二の標本化周波数をF2とした場合(ただしF1>F2)、N1=1+(F1/F2)(N2+1)なるN1個の異なる周波数に対応する実軸上の点で、前記第一の線形予測係数を用いてパワスペクトルを求めることにより、前記第二の線形予測係数に対応する前記パワスペクトルを求める、請求項4に記載の線形予測係数変換方法。
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