Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1984-08-08
1986-03-18
LaRoche, Eugene R.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330 51, 328165, H03F 126
Patent
active
045771618
ABSTRACT:
In a noise reduction circuit, a sampling pulse is generated for opening a switch in time-coincident relationship with a signal portion which is affected by a noise impulse. During tracking modes the signal is passed through the switch to a junction between a capacitor and a noninverting amplifier to charge the capacitor to the level of the signal. During a sampling mode the switch is open to block the signal. A feedback circuit having plural time constant values is connected between the output and input of the amplifier to provide primary and secondary differentiation of the output signal of the amplifier. The feedback circuit is disabled during tracking modes to enable the amplifier to linearly amplify the voltage developed across the capacitor and is enabled during the sampling mode to differentiate the voltage that occurred immediately before the switch is turned off for application to the input of the amplifier for linearly interpolating the noise-affected portion of the signal.
Hirohashi Kazutoshi
Ishigaki Yukinobu
Namiki Yasuomi
LaRoche Eugene R.
Mottola Steven J.
Victor Company of Japan Ltd.
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