Noise reduction circuit

Details Noise reduction circuit Noise reduction circuit

H - Electricity

03

F

352/68, 352/20.8

H03F 1/26 (2006.01) H03G 9/02 (2006.01)

Patent

CA 1161560

SO1438 S81P89 ABSTRACT OF THE DISCLOSURE 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 a diffe- rentiating circuit for differentiating 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 am- plifier; a feedback resistor connected as a negative feedback path with the first signal path for providing an upper limit to the gain imparted to the signal supplied to the noise reduc- tion circuit; a subtraction circuit for subtracting the negative- ly fed back signals from the signal supplied to the noise reduc- ton circuit to produce an input signal for the first signal path; a second resistor or a low-pass filter connected as a positive feedforward path between the input of the noise reduction circuit and the output of the first signal path for providing a lower limit to the gain imparted to the signal supplied to the noise reduction circuit; and an anti-limiting circuit connected in parallel with the feedback resistor for compensating the sig- nal supplied to the noise reduciton circuit when the level of the signal is abruptly increased.

385274

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