Method of detecting defects in read out signals, and apparatus f

Details Method of detecting defects in read out signals, and apparatus f Method of detecting defects in read out signals, and apparatus f

1975-07-21

1977-04-12

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358128, 360 38, H04N 576

Patent

active

040178951

ABSTRACT:
The present invention relates to a method and apparatus for detecting defects in signals produced by the read-out of information recorded upon a data carrier. The defects correspond either to an abnormally high frequency or to an abnormally low frequency. Detection is achieved by means of one, two or three monostable switching circuits supplied with trigger pulses originating from squared read-out signals. The signal produced by the last monostable switching circuit is used for controlling a defect correcting circuit.

REFERENCES:
patent: 3071723 (1963-01-01), Gabor
patent: 3080487 (1963-03-01), Mellott et al.
patent: 3474418 (1969-10-01), Jensen
patent: 3865981 (1975-02-01), Welch et al.
patent: 3909518 (1975-09-01), Baker
patent: 3912858 (1975-10-01), Kenney
patent: 3925605 (1975-12-01), Rennick
patent: 3925811 (1975-12-01), Kenney
patent: 3947873 (1976-03-01), Buchan

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