Patent ID: 6732070
Filing Date: 2004-05-04
Classification: G10L

Abstract:
A system for encoding an nth frame in a succession of frames of a wideband (WB) speech signal, the system comprising:a) a WB linear predictive (LP) analysis module (11) responsive to the nth frame of the wideband speech signal, for providing LP analysis filter characteristics; b) a WB LP analysis filter (12a), also responsive to the nth frame of the WB speech signal, for providing a filtered WB speech input; c) a band-splitting module (14), responsive to a WB target signal xw(n) determined from the filtered WB speech input for the nth frame, for splitting the filtered WB target signal xw(n) into a plurality of bands, the band-splitting module for providing a lower band (LB) target signal x(n); d) an excitation search module (16), responsive to the LB target signal x(n), for providing an LB excitation exc(n); and e) a band-combining module (17), responsive to the LB excitation exc(n) and optionally to an additional signal serving as a higher band (HB) excitation exch(n), for interpolating the LB excitation exc(n) to provide an interpolated LB excitation, and for optionally combining the interpolated excitation and the additional signal so as to provide a WB excitation excw(n).