Patent ID: 6681202
Filing Date: 2004-01-20
Classification: G10L

Abstract:
Telecommunications system comprising at least a transmitter and a receiver for transmitting a speech signal with a given bandwidth, the receiver comprising means for extending the bandwidth of the received signal, wherein said receiver comprises:means for receiving a band-limited signal as input; means for segmenting said band-limited signal into a plurality of speech frames; a detector for characterizing each speech frame of said band-limited input signal; means for selecting one of a plurality of mappings in accordance with said characterization; analysis means for extracting filter coefficients of said band-limited input signal; means for creating a band-limited residual signal from a current speech frame of said input filter coefficients; means for extending the bandwidth of said band-limited residual signal; means for calculating a set of bandwidth-extended filter coefficients using said filter coefficients and said selected mapping; and a synthesis filter for outputting said extended bandwidth signal, said filter including means for filtering said bandwidth extended residual signal with said bandwidth extended filter coefficients.