发明名称 |
Signal encoding apparatus, signal encoding method, and program |
摘要 |
The present invention intends to render quantization noise virtually imperceptible for a user and to prevent reduction in frequency resolution and reduction in encoding efficiency. A signal encoding apparatus includes: a quantization unit for quantizing an input signal based on a plurality of quantization methods; a dequantization unit for obtaining decoded signals by performing the dequantizing process; an error signal calculation unit for calculating a plurality of error signals between the decoded signals and the input signal; a weighting calculation unit for calculating, for each subblock, a weight related to degree concerning whether or not quantization noise corresponding to error signal is virtually imperceptible for a user; a quantization method selection unit for selecting a given quantization method from among the plurality of quantization methods, when a plurality of weighted error signals, obtained by assigning a weight of each subblock to an error signal of the subblock, are generated, based on the of weighted error signals; and an output unit for outputting the input signal quantized based on the given quantization method as an output signal.
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申请公布号 |
US2005075872(A1) |
申请公布日期 |
2005.04.07 |
申请号 |
US20040500103 |
申请日期 |
2004.06.25 |
申请人 |
KIKUIRI KEI;NAKA NOBUHIKO;OHYA TOMOYUKI |
发明人 |
KIKUIRI KEI;NAKA NOBUHIKO;OHYA TOMOYUKI |
分类号 |
G10L19/02;H04N7/26;H04N7/30;(IPC1-7):G10L19/00 |
主分类号 |
G10L19/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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