Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1981-09-08
1984-04-03
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330284, H03F 126, H03G 318
Patent
active
044410840
ABSTRACT:
A noise reduction circuit for use in an audio signal recording/reproducing apparatus is comprised of a first signal path including a voltage-controlled amplifier for amplifying a signal supplied thereto with controllable gain and integrating circuit for integrating at least that portion of the signal passing through the voltage-controlled amplifier within the audio range; a level detecting circuit for controlling the gain of the voltage-controlled amplifier in response to the level of the signal passing through the voltage-controlled amplifier; a feedforward resistor connected in parallel with the first signal path for providing a lower limit to the gain imparted to the signal supplied to the noise reduction circuit; an adder circuit for adding the output signals from the first signal path and the feedforward resistor; a second resistor or a low-pass filter connected as a negative feedback path between the output of the adder circuit and the input of the first signal path for providing an upper limit to the gain imparted to the signal supplied to the noise reduction circuit; and an anti-limiting circuit connected in parallel with the first signal path for compensating the signal supplied to the noise reduction circuit when the level of the signal is abruptly increased.
REFERENCES:
patent: 4004253 (1977-01-01), Takasaki et al.
patent: 4080580 (1978-03-01), Takasaki et al.
Akagiri Kenzo
Katakura Masayuki
Ookouchi Motomi
Eslinger Lewis H.
Mullins James B.
Sinderbrand Alvin
Sony Corporation
Wan Gene
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