Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1994-06-23
1996-12-17
Coles, Sr., Edward L.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, A61F 1106, H04B 1500
Patent
active
055861903
ABSTRACT:
An active adaptive control system introduces a control signal from an output transducer (14) to combine with the system input signal (6) and yield a system output signal (8). An error transducer (16) senses the system output signal and provides an error signal (44). An adaptive filter model (40) has a model input from a reference signal (42) correlated to the system input signal, and an output outputting a correction signal (46) to the output transducer to introduce the control signal according to a weight update signal (74) provided by the product (from multiplier 72) of the reference signal and the error signal. Selective leakage of the weight update signal is provided in response to a given condition of a given parameter, preferably output power of the correction signal, to control performance of the model, to selectively degrade same according to need. Leakage is varied by multiplying a previous weight update value by a factor .gamma. and adding the result to the product of the reference signal and error signal, and varying .gamma. as a function of the correction signal.
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Finn Brian M.
Trantow Jerry J.
Coles Sr. Edward L.
Digisonix, Inc.
Grant II Jerome
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