Recording system with noise reduction

Details Recording system with noise reduction Recording system with noise reduction

1981-04-13

1984-07-31

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 29, G11B 504

Patent

active

044633920

ABSTRACT:
Recording apparatus which receives a signal, double-sideband amplitude modulates a carrier with at least three times the highest carrier frequency, with the signal, and records the modulated carrier on a recording medium. The reproducing apparatus reproduces the signal modulated carrier substantially free from superimposed noise and delivers it to an external circuit, where it may be recorded or may be demodulated and the signal recorded.

REFERENCES:
patent: 2807797 (1957-09-01), Shoemaker
patent: 3012234 (1961-12-01), Burns
patent: 3405232 (1968-10-01), Morrow et al.
patent: 4148078 (1979-04-01), Riddle, Jr.
Reference Data for Radio Engineers, New York 1969 pp. 21-13 and 21-14.
"Modulation, Noise & Spectral Analysis"-P. F. Panter, McGraw Hill 1965 pp. 524-527.
"Zero-Crossing Detector Provides Fast Sync Pulses", Prigozy, Electronics 4/19/65 p. 91.
"Transmission System for Communications", Bell Telephone Labortories 1971, pp. 125-128.
"Modulation Theory"-M. S. Black, New York 1953 pp. 48, 57 and 103.
"Information, Transmission, Modulation, & Noise"-Schwartz, McGraw Hill Book Co., p. 91.

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