Apparatus and method for reducing VCA distortion and noise

Details Apparatus and method for reducing VCA distortion and noise Apparatus and method for reducing VCA distortion and noise

1992-12-10

1994-12-27

Mullins, James B.

Amplifiers

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

330295, H03F 132, H03F 368

Patent

active

053768965

ABSTRACT:
To reduce the level of noise and to reduce distortion, an input audio signal is equally divided between a pair of VCAs. Each VCA receives an equal portion of the audio signal's current and has its gain controlled by a common control voltage. The outputs of the VCAs are summed together and are applied to an inverting input terminal of an op-amp. The gain of the VCAs is set at 6 dB and the gain of the op-amp is set at -6 dB. Since the op-amp sums audio signals at 6 dB and sums noise and broadband signals at 3 dB, the signal to noise ratio in the output signal is increased and the noise level, the total harmonic distortion, the intermodulation distortion, and the DC feed through are all reduced in comparison to the input signal.

REFERENCES:
patent: 3477031 (1969-11-01), Nagata
patent: 4628278 (1986-12-01), Bottman
Chapman, "Noise Cancelling Preamp," Elektor Jul./Aug. 1977, No. 7-8, vol. 3 p. 58.

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