Audio processing with time advanced inserted payload signal
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United States of America Patent
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Oct 18, 2011
Grant Date -
May 3, 2007
app pub date -
Sep 29, 2006
filing date -
Oct 28, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Audio processing apparatus in which a payload signal is inserted into a primary audio signal comprises a noise generator operable to generate a noise signal in dependence on the payload signal; a level detector for detecting a signal level of the primary signal; a modulator for respectively increasing or decreasing the level of the noise signal in response to an increase or a decrease of the detected signal level of the primary audio signal, to generate a modulated noise signal; a combiner for combining the primary signal and the modulated noise signal; and a signal delay arrangement; the modulator operating with respect to the signal delay arrangement so that a decrease in the level of the noise signal is time-advanced with respect to the corresponding decrease in the signal level of the primary audio signal.
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