Diffuse sound shaping for BCC schemes and the like

US8238562B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Agere Systems Inc. · US

Inventors

• Eric A. Allamanche · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Christof Faller · New Providence, US
• Juergen Herre · Erlangen, DE

Key dates

• Filing date: Aug 31, 2009
• Grant date: Aug 7, 2012
• Expiry date: Aug 31, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S3/02
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

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.