Noise suppression circuit adapted for use with bifilar windings

Details Noise suppression circuit adapted for use with bifilar windings Noise suppression circuit adapted for use with bifilar windings

1977-08-26

1979-01-02

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 69, 330124R, 330149, 330295, H03K 500

Patent

active

041329546

ABSTRACT:
A noise suppression circuit adapted for use with bifilar windings such as normally present in magnetic pick-up heads. The signals from the windings are coupled to a pair of operational amplifiers having a common gain control resistor for filtering out common mode noise. The first stage amplifiers are coupled to a pair of second stage amplifiers biased at the voltage of the bifilar windings and have resistance-capacitance filter circuits. The second stage amplifiers are coupled to a third stage amplifier which transforms the signal to digital form, the remaining noise appearing as spikes in the signal. The output of this amplifier is coupled to a digital noise filter circuit which includes a one-shot multivibrator coupled to a flip-flop arranged to control the digital waveform so as to filter out the spikes, that is, to eliminate the noise in the signal.

REFERENCES:
patent: 3036271 (1962-05-01), Alexander et al.
patent: 3419809 (1968-12-01), Lach et al.
patent: 3571730 (1971-03-01), Webb
patent: 3593162 (1971-07-01), Patmore
Hollstein, "Read Data Gate Generator," IBM Technical Disclosure Bulletin, vol. 12, No. 12, May 1970, pp. 2183-2184.

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