Noise canceler

Details Noise canceler Noise canceler

1993-04-09

1995-04-11

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327310, 327551, H03B 104

Patent

active

054061490

ABSTRACT:
In a noise canceler, a pilot-canceling signal without noise is applied to the inverting input of a subtracter via a first MOS transistor. When a noise signal is present, a pilot signal and noise signal passing through a capacitor are applied to the inverting input port of the subtracter via a second MOS transistor to cancel the noise signal contained in the composite input signal. In the canceler, external noise may be digitally converted and the inverted noise thereof stored in a memory. When a noise signal detector detects the external noise, inverted data corresponding to the external noise is output from the memory. The detector enables an address generator to continuously generate addresses. The memory reads out inverted noise patterns which are converted into analog form and transmitted via a speaker, thereby canceling noises produced by various electrical and electronic appliances as well as nearby automobiles and aircraft.

REFERENCES:
patent: 3979683 (1976-09-01), Ikeda
patent: 4268793 (1981-05-01), Amazawa et al.
patent: 4701715 (1987-10-01), Amazawa et al .
patent: 4924121 (1990-05-01), Ohno
patent: 5109533 (1992-04-01), Mine et al.
patent: 5182478 (1993-01-01), Nomura

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