Patent ID: 7505900
Filing Date: 2009-03-17
Classification: G10L,H04N

Abstract:
1. A signal encoding apparatus configured to quantize an input voice signal, to encode the input voice signal quantized, and then to output the input voice signal encoded as an output signal, the signal encoding apparatus comprising: a quantizer configured to quantize the input voice signal of a predetermined block based on a plurality of quantization methods and to generate a plurality of quantized signals; a dequantizer configured to obtain a plurality of decoded signals by respectively dequantizing the plurality of quantized signals; an error signal calculator configured to calculate a plurality of error signals of the predetermined block, each of which indicates a difference between each of the plurality of decoded signals and the input voice signal; a weight calculator configured to calculate, for respective short blocks included in the predetermined block, weights negatively-correlated with frequency power spectrums of the input voice signal corresponding to the short blocks included in the predetermined block; a weighted error signal generator configured to weight the plurality of error signals corresponding to the short blocks respectively, by using the weights calculated by the weight calculator, and to generate a plurality of weighted error signals; an electric power calculator configured to calculate electric power values of the plurality of weighted error signals respectively, and a quantization method selector configured to compare the electric power values of the plurality of weighted error signals with one another, and to select a quantization method from among the plurality of quantization methods based on a result of the comparison; an encoder configured to encode the input signal which is quantized based on the selected quantization method; and an outputting unit configured to output the input voice signal encoded as an output signal.