In band signal detection and presentation for IP phone
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United States of America Patent
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May 27, 2008
Grant Date -
Oct 20, 2005
app pub date -
Apr 17, 2004
filing date -
Apr 17, 2004
priority date (Note) -
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Abstract
A system for reducing jitter in a packet audio reception device comprises an output time stamp index, a delay calculation module, and a histogram module. The output time stamp index determines an initial output time stamp value upon receipt of a jitter buffer latency value and increments the output time stamp upon release of each of the frames by a jitter buffer. The delay calculation module calculates a delay value for each of the sequence of received frames. The histogram module periodically calculates a target delay value which, based on a buffered history of values representing the delay value of each of a fixed quantity of the most recently received frames, would have resulted in a predetermined portion of the fixed quantity of frames being dropped, and adjusting the jitter buffer latency value to a value equal to the target value.
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