Efficient and scalable parametric stereo coding for low...

Details Efficient and scalable parametric stereo coding for low... Efficient and scalable parametric stereo coding for low...

2009-07-02

2011-12-20

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Quadrasonic

C381S023000, C381S017000, C704S500000, C704S501000

Reexamination Certificate

active

08081763

ABSTRACT:
The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.

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