Howling controller
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United States of America Patent
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Jul 8, 2003
Grant Date -
N/A
app pub date -
Sep 30, 1998
filing date -
Oct 24, 1997
priority date (Note) -
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Abstract
A digital signal processing algorithm to cancel howling in a telephone circuit, the telephone circuit being characterized by a receive path and a transmit path in an effective closed loop configuration. The algorithm monitors input samples taken from the receive path and, if a howling signal is detected, controlled amounts of attenuation are introduced to the loop until howling is cancelled. In a preferred embodiment a prediction logic is included in the algorithm to verify the howling signal.
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