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US 8,300,833 B2Granted
Multichannel spectral mapping audio apparatus and method with dynamically varying mapping coefficients
AssigneeTerry D. Beard
InventorTerry D. Beard
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Abstract
A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.
Claims10
An audio signal decoding method comprising:
- receiving a first audio signal organized into successive temporal aperture periods and mapping coefficients, the first audio signal having a first signal configuration, the mapping coefficients for each of aperture periods that vary among said aperture periods, and defined by an encoding process that is independent of the audio signal decoding method;
- and
- generating a second audio signal from the first audio signal and the mapping coefficients, wherein the second audio signal has a second signal configuration that is different than the first signal configuration.
Dependencies are inferred from the claim text.