Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1985-03-20
1987-07-21
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 91, 358340, 358167, 358335, H04N 591
Patent
active
046822518
ABSTRACT:
A video signal reproducing apparatus comprises a reproducing circuit for reproducing from a recording medium a pre-recorded video signal having field correlation and having a predetermined band, and a noise reduction circuit supplied with a reproduced video signal from the reproducing circuit for essentially reducing noise included within the reproduced video signal. The noise reduction circuit comprises first and second subtracting circuits supplied with the reproduced video signal from the reproducing circuit, a one-field delay circuit for delaying an output of the first subtracting circuit by a predetermined time period and for supplying a delayed signal to the second subtracting circuit, which predetermined time period is equal to one field or a time period which is a natural number multiple of one horizontal scanning period and is extremely close to one field, and a limiter for amplitude-limiting an output of the second subtracting circuit and for supplying an amplitude limited signal to the first subtracting circuit. The output of the first subtracting circuit is obtained as an output of the noise reduction circuit. The one-field delay circuit has a transmission band which is narrower than a band of the reproduced video signal.
REFERENCES:
patent: 4058836 (1977-11-01), Drewery
patent: 4513311 (1985-04-01), Hiroi
patent: 4563704 (1986-01-01), Hirota
BKSTS Dictionary of Audio-Visual Terms, .COPYRGT.1983, pp. 1, 30, 31, 86, 87, published by Butterworth & Co.
Hirota Akira
Tsushima Takuya
Faber Alan
Meller Michael N.
Victor Company of Japan Ltd.
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