Method and apparatus for transmitting an audio stream having additional payload in a hidden sub-channel
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United States of America Patent
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Feb 12, 2008
Grant Date -
Apr 8, 2004
app pub date -
Sep 10, 2003
filing date -
Oct 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus are provided for communicating an audio stream. A perceptual mask is estimated for an audio stream, based on the perceptual threshold of the human auditory system. A hidden sub-channel is dynamically allocated substantially below the estimated perceptual mask based on the characteristics of the audio stream, in which additional payload is transmitted. The additional payload can be related to components of the audio stream that would not otherwise be transmitted in a narrowband signal, or to concurrent services that can be accessed while the audio stream is being transmitted. A suitable receiver can recover the additional payload, whereas the audio stream will be virtually unaffected from a human auditory standpoint when received by a traditional receiver. A coding scheme is also provided in which a portion of a codec is used to code an upper-band portion of an audio stream, while the narrowband portion is left uncoded.
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