Audio Encoder and Decoder for Interleaved Waveform Coding

摘要

There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.

主权项

1. A decoding method in an audio processing system comprising:
receiving a first waveform-coded signal having a spectral content up to a first cross-over frequency, receiving a second waveform-coded signal having a spectral content corresponding to a subset of the frequency range above the first cross-over frequency, wherein the spectral content of the second waveform-coded signal includes a frequency interval extending down to the first cross-over frequency and having a time-variable upper bound, receiving high frequency reconstruction parameters, performing high frequency reconstruction using the first waveform-coded signal and the high frequency reconstruction parameters so as to generate a frequency extended signal having a spectral content above the first cross-over frequency, and interleaving the frequency extended signal with the second waveform-coded signal.