Patent10.1121/1.423211
Speech parameter encoder.
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TL;DR: In this paper, a speech parameter encoder capable of encoding spectrum parameters at a bit rate of 1 kb/s or less with comparatively small amount of operations and memory capacity is presented.
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Abstract: A speech parameter encoder capable of encoding spectrum parameters at a bit rate of 1 kb/s or less with comparatively small amount of operations and memory capacity. A spectrum parameter calculation unit (130) derives a spectrum parameter representing the spectrum envelope of a discrete input speech signal through division thereof into frames each having a predetermined time length. A weighted coefficient calculation unit (150) derives a weighted coefficient corresponding to an auditory masking threshold value through derivation thereof from the speech signal. A spectrum parameter quantization unit (160) receives the weighted coefficient and the spectrum parameter and centeses the spectrum parameter through search of a codebook such as to minimize the weighting distortion based on the weighted coefficient.
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Citations
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Takeshi Norimatsu,Shuji Miyasaka,Yoshihisa Nakato,Mineo Tsushima,Tomokazu Ishikawa +4 more
- 01 Jul 1997
TL;DR: In this article, a vector quantization method is used to reduce the quantity of data in an audio signal by using a minimum distance among auditive distances between sub-vectors produced by dividing an input vector and audio codes in a transmission-side code book.
45
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Takeshi Norimatsu,Shuji Miyasaka,Yoshihisa Nakatoh,Mineo Tsushima,Tomokazu Ishikawa +4 more
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TL;DR: In this article, the authors provided a coding apparatus that enables a decoding apparatus to reproduce an audio signal even through it does not use all of the data from the coding apparatus, and corresponding decoding apparatus corresponding to the decoding apparatus.
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