Noise reduction by linear interpolation using a dual function am

Details Noise reduction by linear interpolation using a dual function am Noise reduction by linear interpolation using a dual function am

1984-07-27

1985-09-03

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

328165, H03F 126, H04B 110

Patent

active

045395276

ABSTRACT:
In a noise reduction circuit, a sampling pulse is generated for operating a switch in time-coincident relationship with the portion of a signal which is affected by a noise impulse. The signal, applied to an input terminal, is normally passed through the switch to a junction between a capacitor and a noninverting amplifier and is blocked when the switch opens in response to the sampling pulse. A differentiator is connected in a feedback circuit from the output of the noninverting amplifier to the input thereof. The differentiator is disabled when the switch remains closed and when the switch opens in response to the sampling pulse it begins differentiating a voltage which occurred immediately prior to the detection of the noise and supplies it to the capacitor to linearly interpolate the portion of the information signal which is disrupted by the noise impulse.

REFERENCES:
patent: 4311963 (1982-01-01), Watanabe et al.

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