Audio signal coding method, involves coding one part of audio signal frequency spectrum with core coder and another part with extension coder, where part of spectrum is coded with both core coder and extension coder

摘要

The method involves coding a part of a frequency spectrum of an audio signal with a core coder. A complementary part of the frequency spectrum of the audio signal is coded with an extension coder. A part of the spectrum coded with the core encoder is also encoded with the extension encoder. A cut-off frequency of the core coder is determined and is transferred with a coded digital signal on a network. Independent claims are also included for the following: (a) a method of spectral reconstruction of a coded audio signal (b) a device for coding an audio signal (c) a device for spectral reconstruction of a coded audio signal (d) a data signal representing a coded audio signal (e) a computer program stored on a computer medium comprising instruction enabling to implement coding method (f) a computer program stored on a computer medium comprising instruction enabling to implement a spectral reconstruction method.