Bandwidth extension encoder, bandwidth extension decoder and phase vocoder

摘要

Bandwidth Extension Encoder, Bandwidth Extension Decoder and Phase Vocoder Abstract A bandwidth extension encoder for encoding an audio signal is described. The bandwidth extension encoder comprises a signal analyzer, a core encoder and a parameter calculator. The audio signal comprises a low frequency signal comprising a core frequency band and a high frequency signal comprising an upper frequency band. The signal analyzer is 10 configured for analyzing the audio signal, the audio signal having a block of audio samples, the block having a specified length in time. The signal analyzer is furthermore configured for determining, from a plurality of analysis windows, an analysis window to be used for performing a bandwidth extension in a bandwidth extension decoder. The core encoder is configured for encoding the low frequency signal to obtain an encoded low 15 frequency signal. The parameter calculator is configured for calculating bandwidth extension parameters from the high frequency signal. Fig. 1 5125610_1 (GHMatters) P89112.AU.1