Patent ID: 6718295
Filing Date: 2004-04-06
Classification: G10L,H03G,H04B

Abstract:
A speech band division decoder for decomposing a band division coded signal obtained by dividing a speech signal into a plurality of frequency sub-band signals, coding these signals and synthesizing the coded signals into a plurality of sub-bands, updating a playback scale factor of a predetermined sub-band coded signal by reducing the playback scale factor of coded signals of sub-bands adjacent to the predetermined sub-band to emphasize the predetermined sub-band, synthesizing the resultant coded signals, and analog converting the resultant signal to obtain a speech signal having a predetermined frequency characteristic, the speech band division decoder further comprising speech signal gain control means for controlling the gain of the analog converted speech signal to increase an analog audio signal output level of the analog converted speech signal responsive to the reduction of the scale factors of the adjacent sub-bands.