G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/12 (2006.01)
Patent
CA 2177226
A speech coding apparatus produces sound with good quality even at a low bit rate. In the speech coding apparatus, a spectral parameter calculator determines spectral parameters from an inputted speech signal, quantizes the spectral parameters and outputs a plurality of quantization candidates. An adaptive code book is provided for determining delays with respect to each of said quantization candidates outputted from said spectral parameter calculator, generating a pitch predictive signal based on a past excitation signal for each of the delays and associating quantization candidates, and outputaing a quantization candidate and a delay which provide a minimum distortion between the speech signal and said pitch predictive signal. The speech coding apparatus further comprises an excitation quantizer for quantizing and ouitputting the excitation signal of said speech signal, and a gain quantizer for quantizing and outputting a gain of at least: one of said adaptive code book and said quantized excitation signal.
Corporation Nec
G. Ronald Bell & Associates
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