AUDIO CODING METHOD AND APPARATUS

摘要

An audio signal is coded, where a frequency spectrum of the audio signal is divided into first and second regions. Spectral peaks in the first region are encoded by a first coding method. For a segment of the audio signal, a relation between an energy of a band in the second region and an energy estimate of the first region is determined. A relation between the energy of the band in the second region and energy of neighboring bands in the second region is determined. A determination is made whether available bits are sufficient for encoding at least one non-peak segment of the first region and the band in the second region. Further, when the relations fulfill a respective criterion and the bits are sufficient, the band in the second region and the at least one segment of the first region are encoded using a second coding method.

主权项

1. A method for encoding an audio signal, where a frequency spectrum of the audio signal is divided into at least a first and a second region, where at least the second region comprises a number of bands, and where spectral peaks in the first region are encoded by a first coding method, the method comprising:
for a segment of the audio signal: determining a relation between an energy of a band in the second region and an energy estimate of the first region; determining a relation between the energy of the band in the second region and an energy of neighboring bands in the second region; determining whether an available number of bits is sufficient for encoding at least one non-peak segment of the first region and the band in the second region; and when the relations fulfill a respective predetermined criterion and the number of bits is sufficient:
encoding the band in the second region and the at least one segment of the first region using a second coding method and otherwise:subjecting the band in the second region to BandWidth Extension BWE or noise fill.