Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1986-10-23
1988-04-05
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, H04B 1500
Patent
active
047364319
ABSTRACT:
An active acoustic attenuation system is provided that increases dynamic range by adjusting the amplitude of the input signal and the error signal at respective model and error inputs (42, 44) and providing automatic self-calibration. Input and error transducers (10, 16) provide analog input and error signals which are converted by an analog to digital converter (164, 170) to digital input and error signals for input to the model (40). Digital to analog converters (176) have digital inputs from respective digital input and error signals and operate in an analog to analog mode with analog inputs from respective input and error transducers (10, 16) and analog outputs to the analog to digital converter (164, 170). Dynamic range is also increased by adjusting the amplitude of the correction signal to the output transducer (14).
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G.E. Intersil AD7523, 8-Bit Multiplying D/A Converter.
Allie Mark C.
Bailey Geoffrey S.
Isen Forester W.
Nelson Industries Inc.
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