SPEECH SIGNAL ENCODING/DECODING METHOD AND APPARATUS

摘要

The present invention relates to a speech signal encoding method for encoding an inputted first speech signal into a second speech signal having a narrower available bandwidth than the first speech signal. The method comprises generating a pitch-scaled version of higher frequencies of the first speech signal and including in the second speech signal lower frequencies of the first speech signal and the pitch-scaled version of the higher frequencies. At least a part of the higher frequencies are frequencies that are outside the available bandwidth of the second speech signal. The pitch-scaled version of the higher frequencies is preferably included in the second speech signal with a gain factor having a value of 1 or a value higher than 1. The present invention further relates to a corresponding speech signal decoding method for decoding an inputted first speech signal into a second speech signal having a wider available bandwidth than the first speech signal.

主权项

1. A speech signal encoding method for encoding an inputted first speech signal into a second speech signal having a narrower available bandwidth than the first speech signal, wherein the method comprises:
generating a pitch-scaled version of higher frequencies of the first speech signal, and including in the second speech signal lower frequencies of the first speech signal and the pitch-scaled version of the higher frequencies of the first speech signal, wherein at least a part of the higher frequencies of the first speech signal are frequencies that are outside the available bandwidth of the second speech signal, and wherein the pitch-scaled version of the higher frequencies of the first speech signal is preferably included in the second speech signal with a gain factor having a value of 1 or a value higher than 1.