BANDWIDTH EXTENSION ENCODER, BANDWIDTH EXTENSION DECODER AND PHASE VOCODER

摘要

A bandwidth extension encoder for encoding an audio signal 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 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 or frequency signal. The parameter calculator is configured for calculating bandwidth extension parameters from the high frequency signal.