Patent ID: 8214202

Claim:
An audio/speech sender comprising a core encoder adapted to encode a core frequency band of an input audio/speech signal, the core encoder operating on frames of the input audio/speech signal comprising a pre determined number of samples, the input audio/speech signal having a first sampling frequency, and the core frequency band comprises frequencies up to a cut-off frequency, the audio/speech sender comprising: a segmentation device adapted to perform a segmentation of the input audio/speech signal into a plurality of segments, wherein each segment has an adaptive segment length; a cut-off frequency estimator adapted to estimate a cut-off frequency for each segment associated with the adaptive segment length and adapted to transmit information about the estimated cut-off frequency to a decoder, wherein the cut-off frequency estimator is further adapted to transmit information about the estimated cut-off frequency to a decoder by indirect signaling via the segmentation; a low-pass filter adapted to filter each segment at said estimated cut-off frequency; and a re-sampler adapted to resample the filtered segments with a second sampling frequency that is related to said cut-off frequency in order to generate an audio/speech frame of the predetermined number of samples to be encoded by said core encoder.