Signal encoding method and apparatus and signal decoding method and apparatus
First Claim
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1. A spectrum coding method comprising:
- quantizing, by a first quantization unit, spectral data for each important spectral component of a current band based on a first quantization scheme;
extracting a lower bit evenly for the each important spectral component of the current band from the quantized spectral data;
generating a sequence of lower bits for a plurality of bands including the current band;
quantizing, by a second quantization unit, the sequence of lower bits based on a second quantization scheme; and
generating, by a bitstream generating unit, a bitstream including the quantized spectral data, excluding the extracted lower bits, for the current band and the quantized sequence of lower bits for the plurality of bands.
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Abstract
A spectrum coding method includes quantizing spectral data of a current band based on a first quantization scheme, generating a lower bit of the current band using the spectral data and the quantized spectral data, quantizing a sequence of lower bits including the lower bit of the current band based on a second quantization scheme, and generating a bitstream based on a upper bit excluding N bits, where N is 1 or greater, from the quantized spectral data and the quantized sequence of lower bits.
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8 Claims
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1. A spectrum coding method comprising:
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quantizing, by a first quantization unit, spectral data for each important spectral component of a current band based on a first quantization scheme; extracting a lower bit evenly for the each important spectral component of the current band from the quantized spectral data; generating a sequence of lower bits for a plurality of bands including the current band; quantizing, by a second quantization unit, the sequence of lower bits based on a second quantization scheme; and generating, by a bitstream generating unit, a bitstream including the quantized spectral data, excluding the extracted lower bits, for the current band and the quantized sequence of lower bits for the plurality of bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification