Patent ID: 9111529
Filing Date: 2015-08-18
Classification: G10L,H04S

Abstract:
1. A method for encoding and decoding a digital audio signal composed of an original right sound signal and of an original left sound signal, comprising the steps of: combining the original right sound signal and the original left sound signal, before encoding, by a pre-processing module to obtain a single combined signal; encoding the single combined signal using an encoder to obtain a compressed combined signal; decoding the compressed combined signal by a decoder to obtain a decompressed combined signal; generating a restored right sound signal and a restored left sound signal from the decompressed combined signal after decoding, the restored right sound signal and the restored left sound signal de-correlated relative to one another corresponding respectively to the original right sound signal and to the original left sound signal; adding a static meta-datum into a data frame encoded by the encoder, the static meta-datum indicating whether a pre-processing is activated or not, the static meta-datum having only two different values; activating a post-processing module by the decoder when the decoder detects in an encoded frame a first value corresponding to activation of the pre-processing module; and inhibiting the post-processing module and decoding a stereo signal in right and left channels by the decoder when the decoder detects in the encoded frame a second value corresponding to the deactivation of the pre-processing module.