Noise reduction circuit with a main signal path and auxiliary si

Details Noise reduction circuit with a main signal path and auxiliary si Noise reduction circuit with a main signal path and auxiliary si

1983-05-24

1985-10-15

Mullins, James B.

Amplifiers

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

330151, 330260, 330295, 333 14, H03F 126, H03F 368

Patent

active

045477418

ABSTRACT:
A noise reduction circuit has a main signal path and an auxiliary signal path having the characteristics of a high-pass filter with a controllable cut-off frequency, a control circuit varies the cut-off frequency of the high-pass filter as a function of the auxiliary signal path output. The auxiliary signal path current is derived as a current source output so that the summing of the main signal and auxiliary signal can be accomplished by a single operational amplifier, without requiring a buffer amplifier as in known noise reduction circuits. The auxiliary signal path includes a voltage-to-current converter having differential inputs and differential outputs, with a PN junction pair and at least first and second common emitter transistor pairs connected to the differential outputs. The output current of the first common emitter transistor pair is fed back to a differential input terminal of the voltage-to-current converter, and the auxiliary signal path output is derived from the second emitter common transistor pair.

REFERENCES:
patent: 3729693 (1973-04-01), Dolby
patent: 4187472 (1980-02-01), Yum

Affiliated with

Also associated with

Rating

Noise reduction circuit with a main signal path and auxiliary si does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise reduction circuit with a main signal path and auxiliary si, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction circuit with a main signal path and auxiliary si will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2431966