Magnetic recording and reproducing system with noise cancellatio

Details Magnetic recording and reproducing system with noise cancellatio Magnetic recording and reproducing system with noise cancellatio

1978-03-08

1983-03-29

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

360 28, 360 29, 360 30, G11B 543, G11B 502

Patent

active

043785735

ABSTRACT:
A magnetic recording and reproducing system is disclosed in which a frequency-modulated input signal is recorded on a magnetic medium together with a further signal which is discriminative from the frequency-modulated signal. The recorded frequency-modulated signal and further signal are frequency-demodulated so that the former reverts to the input signal and the latter represents an FM noise signal which is generated due to the wow and flutter during the recording and/or reproducing process. The extracted noise signal is mixed with the reproduced input signal thereby canceling an FM noise component in this reproduced signal. The mentioned further signal may be an amplitude-modulated signal of or a carrier wave signal for the frequency-modulated input signal.

REFERENCES:
patent: 2807797 (1957-09-01), Shoemaker
patent: 2975240 (1961-03-01), Berry
patent: 3012234 (1961-12-01), Burns
patent: 3188615 (1965-06-01), Wilcox, Jr.
patent: 3253237 (1966-03-01), Runyan
patent: 3333063 (1967-07-01), Stratton
patent: 3657489 (1972-04-01), Clark, Jr.
patent: 3704349 (1972-11-01), Goshimz et al.
patent: 3872504 (1975-03-01), Belcher

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