Periodic signal enhancement system
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United States of America Patent
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May 1, 2012
Grant Date -
May 11, 2006
app pub date -
Apr 8, 2005
filing date -
Oct 26, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A signal enhancement system improves the understandability of speech or other audio signals. The system reinforces selected parts of the signal, may attenuate selected parts of the signal, and may increase SNR. The system includes delay logic, a partitioned adaptive filter, and signal reinforcement logic. The partitioned adaptive filter may track and enhance the fundamental frequency and harmonics in the input signal. The partitioned filter output signals may approximately reproduce the input signal, delayed by an integer multiple of the period of the fundamental frequency of the input signal. The reinforcement logic combines the input signal and the filtered signals to produce an enhanced output signal.
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