发明公开
- 专利标题: Determination of quantizaion coefficients for a subband audio encoder
- 专利标题(中): 确定音频子带编码器的量化
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申请号: EP01107978.7申请日: 2001-03-29
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公开(公告)号: EP1139336A3公开(公告)日: 2004-01-02
- 发明人: Nishio, Kosuke , Katayama, Takashi , Matsumoto, Masaharu , Kawamura, Akihisa , Fujita, Takeshi , Sueyoshi, Masahiro , Abe, Kazutaka
- 申请人: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
- 申请人地址: 1006, Ohaza Kadoma Kadoma-shi, Osaka 571-8501 JP
- 专利权人: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
- 当前专利权人: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
- 当前专利权人地址: 1006, Ohaza Kadoma Kadoma-shi, Osaka 571-8501 JP
- 代理机构: Balsters, Robert
- 优先权: JP2000095931 20000330; JP2000256512 20000825
- 主分类号: G10L19/02
- IPC分类号: G10L19/02
摘要:
An encoder comprises an input device for sampling an input signal at predetermined time intervals to obtain sampled data on a temporal axis, a conversion device for converting the sampled data on the temporal axis to spectral data on a frequency axis, a quantization device for quantizing the spectral data on the frequency axis, and an output device for outputting a resultant value of quantization as an encoded bit stream. The quantization device comprises an expected-value-of-quantization adjustment portion for determining an expected value of quantization for a specific sub-band on the frequency axis, and a quantization portion for determining a quantization coefficient for the specific sub-band, and quantizing each of a plurality of spectral data contained in the specific sub-band using the quantization coefficient for the specific sub-band. The quantization coefficient for the specific sub-band is determined so that a resultant value of quantization obtained by quantizing one spectral data selected from the plurality of spectral data contained in the specific sub-band, using the quantization coefficient for the specific sub-band, is substantially equal to the expected value of quantization for the specific sub-band.
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