Patent ID: 7599833
Filing Date: 2009-10-06
Classification: G10L

Abstract:
1. A residual signal coding apparatus, comprising: a receiver for inputting audio signals and outputting time-domain residual signals of the inputted audio signals; a transformer for transforming the time-domain residual signals into a frequency domain to output transform coefficients; a linear predictive coding (LPC) coefficient extractor for extracting LPC coefficients from the transform coefficients; an LPC coefficient quantizer for quantizing the LPC coefficients to output quantized LPC coefficients and corresponding indices; a linear prediction (LP) analysis filter including a filter made of the quantized LPC coefficients and performing an LP analysis on the transform coefficients to output LP residual transform coefficients; a band splitter for splitting the LP residual transform coefficients into a predetermined number of bands to output the LP residual transform coefficients on a per-band basis; a pulse searcher for searching the LP residual transform coefficients for the respective bands to select an optimal pulse and output parameters of the optimal pulse; and a pulse quantizer for quantizing the parameters of the optimal pulse, wherein the residual signal coding apparatus outputs quantized LPC coefficients and corresponding indices, and quantized pulse parameters of the inputted audio signals.