Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1984-02-29
1987-02-03
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 381, 360 24, H04N 578
Patent
active
046412069
ABSTRACT:
A video signal recording and reproducing apparatus comprises a circuit for recording an FM recording video signal onto a recording medium, a demodulator for reproducing and demodulating the recorded signal from the recording medium back into the original video signal, a noise reduction circuit for reducing a noise component in the reproduced video signal. The noise reduction circuit has a first delay circuit for delaying the reproduced video signal by one horizontal scanning period (1H), a first differential amplifier supplied with the reproduced video signal and with a 1H delayed reproduced video signal, a first limiter for amplitude-limiting an output of the first differential amplifier, and a subtracting circuit for performing a subtraction between the reproduced video signal and an output of the first limiter. The apparatus further comprises a second differential amplifier supplied with the recording video signal to one input thereof, a second delay circuit for delaying the recording video signal by 1H and for supply a 1H delayed recording video signal to another input of the second differential amplifier, a second limiter for amplitude-limiting an output video signal component of the second differential amplifier to a limiting level approximately in the same range as a limiting level of the first limiter, and an adding and mixing circuit for adding and mixing an output video signal component of the second limiter to the recording video signal.
REFERENCES:
patent: 4041326 (1977-08-01), Robinson
patent: 4302768 (1981-11-01), Kamura et al.
patent: 4524380 (1985-06-01), Shibata et al.
Meller Michael N.
Psitos Aristotelis M.
Victor Company of Japan Ltd.
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