SPEECH DECODER AND A METHOD FOR DECODING SPEECH

摘要

A speech decoder comprises a decoder (103) for converting a linear predictio n encoded speech signal into a first sample stream having a first sampling rat e and representing a first frequency band. Additionally it comprises a vocoder (105) for converting an input signal into a second sample stream having a second sampling rate and representing a second frequency band, and combinati on means (107) for combining the first and second sample streams in processed form. It comprises also means (301) for generating a second linear predictio n filter, to be used by the vocoder (105) on the second frequency band, on the basis of a first linear prediction filter used by the decoder (103) on the first frequency band. Extrapolation through an infinite impulse response filter is the preferable methof of generating the second linear prediction filter.