CONCEALMENT OF INTERMITTENT MONO RECEPTION OF FM STEREO RADIO RECEIVERS

WIPO Patent Application WO/2012/025431

A3

The present invention relates to audio signal processing. In particular, it relates to a method and system for reliably concealing intermittent mono reception of FM stereo radio receivers. The system comprises a parametric stereo parameter estimation stage configured to determine a first parametric stereo parameter based on a first frame of the received two-channel audio signal. The system further comprises a concealment detection stage configured to determine an energy of a side signal within the first signal frame; determine a number of following successive signal frames during which the energy of the side signal drops from a value above the high threshold to a value below a low threshold; determine that the two-channel audio signal following the first signal frame is a forced mono signal if the number of successive signal frames is below a frame threshold; and determine the parametric stereo parameter based on the first parametric stereo parameter.

SEHLSTROM LEIF (SE)
PURNHAGEN HEIKO (SE)
ENGDEGARD JONAS (SE)

PCT/EP2011/064084

April 19, 2012

August 16, 2011

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DOLBY INT AB (NL)
SEHLSTROM LEIF (SE)
PURNHAGEN HEIKO (SE)
ENGDEGARD JONAS (SE)

G10L19/00; G10L21/02; H04B1/16; H04H40/81; G10L19/005; G10L19/008; H04S3/02

WO2010012927A1	2010-02-04
WO2008031611A1	2008-03-20
WO2003007656A1	2003-01-23
WO2008032255A2	2008-03-20

US5068896A	1991-11-26
EP0955732A1	1999-11-10

SOELLNER, Siegfried (Apollo Building 3EHerikerbergweg 1-35, CN Amsterdam, NL)

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