Abstract: In one embodiment, C input audio channels are encoded to generate E transmitted audio channel(s), where one or more cue codes are generated for two or more of the C input channels, and the C input channels are downmixed to generate the E transmitted channel(s), where C>E?1. One or more of the C input channels and the E transmitted channel(s) are analyzed to generate a flag indicating whether or not a decoder of the E transmitted channel(s) should perform envelope shaping during decoding of the E transmitted channel(s). In one implementation, envelope shaping adjusts a temporal envelope of a decoded channel generated by the decoder to substantially match a temporal envelope of a corresponding transmitted channel.
Type:
Grant
Filed:
August 31, 2009
Date of Patent:
August 7, 2012
Assignees:
Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Agere Systems Inc.
Inventors:
Eric Allamanche, Sascha Disch, Christof Faller, Juergen Herre