Patent ID: 7031912
Filing Date: 2006-04-18
Classification: G10L

Abstract:
1. A speech coding apparatus for coding an input signal consisting of one of a speech signal and a voice-band non-speech signal, said speech coding apparatus comprising: a discriminator for deciding as to whether the input signal is a speech signal or a non-speech signal; a frequency parameter generator for outputting, when the input signal is the speech signal, frequency parameters that indicate characteristics of a frequency spectrum of the speech signal, and for outputting, when the input signal is the non-speech signal, frequency parameters obtained by correcting frequency parameters that indicate characteristics of a frequency spectrum of the non-speech signal; a quantization codebook for storing codewords of a predetermined number of frequency parameters; and a quantizer for selecting codewords corresponding to the frequency parameters output from said frequency parameter generating means by referring to said quantization codebook, wherein said frequency parameter generator comprises a correcting section for interpolating frequency parameters between the frequency parameters of the input signal and frequency parameters of white noise when the input signal is the non-speech signal, and for replacing the frequency parameters of the input signal by the frequency parameters interpolated.