Method of detecting defects in signals corresponding to the read

Details Method of detecting defects in signals corresponding to the read Method of detecting defects in signals corresponding to the read

1975-07-21

1977-02-01

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 38, H04N 576

Patent

active

040062953

ABSTRACT:
The present invention relates to a method of detecting defects in the signal furnished by the head used to read-out information recorded upon a data carrier. The read-out signal is converted by two voltage comparators whose thresholds are respectively lower and higher than the mean peak amplitude of the carrier signal in two squarewave signals which, applied to an assembly of monostable switching circuits associated with logic gates, are responsible for the production of a defect signal capable of controlling a defect correcting circuit, which is fed with the read-out signal.

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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