Patent ID: 7486719
Filing Date: 2009-02-03
Classification: G10L

Abstract:
1. A transcoder that performs inter-conversion between a code encoded in accordance with a first encoding method and a code encoded in accordance with a second encoding method, comprising: a first decoding unit, receiving a code encoded by the first encoding method, for decoding the received code in accordance with a first decoding method to output a decoded signal; a spectrum parameter calculating unit, receiving the decoded signal, for calculating a spectrum parameter representing spectrum characteristics to output the resultant spectrum parameter; a noise generating unit for generating a noise signal; a coefficient calculating unit for shifting a frequency of the spectrum parameter, and calculating filter coefficients to output the filter coefficients; a gain unit for applying a gain to the output signal from said noise generating unit to output the resulting signal; a synthesis filter unit including a synthesis filter configured by the filter coefficients from said coefficient calculating unit, said synthesis filter, receiving the output signal from said gain unit, for passing the output signal through the synthesis filter to output a signal of a band required for band conversion; a sampling frequency conversion circuit for converting the decoded signal using a predetermined sampling frequency to output the resulting signal; an adder for summing the output signal of said sampling frequency conversion circuit and the output signal of said synthesis filter unit to output the resulting signal; and a second encoding unit, receiving the output signal of said adder for encoding the output signal in accordance with the second encoding method to produce and output a second code.