Abstract
In order to efficiently quantize LPC coefficients with low complexity, a plurality of first paths that do not use inter-frame prediction and second paths that use inter-frame prediction before quantization of the input signal When one of the paths is selected as a quantization path of the input signal based on a predetermined criterion, and when the first path is selected as the quantization path of the input signal, inter-frame prediction is used. A first quantization unit that quantizes the input signal using the first quantization scheme that is not performed, and a second quantization that uses inter-frame prediction when the second path is selected as the quantization path of the input signal And a second quantization unit that quantizes the input signal using the scheme.
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