Dropout detecting circuit with one-half wavelength delay

Details Dropout detecting circuit with one-half wavelength delay Dropout detecting circuit with one-half wavelength delay

1989-03-15

1990-12-11

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 360 381, 369 60, H04N 594

Patent

active

049774611

ABSTRACT:
A dropout detection circuit includes a delay circuit for causing a delay in playback signals reproduced from an optical recording medium. The delay corresponds to one half of the wavelength of the central frequency of the carrier wave for the playback signals. A summation circuit sums the playback signals with the delayed output signals of the delay circuit, and a level detection circuit detects when the output signal level of the summation circuit exceeds a predetermined level. The output signal of the level detection circuit serves as a signal for detecting dropouts in the reproduced signals and is used as a control signal to control the operation of a switch. The switch normally passes demodulated playback signals to an output terminal. However, in case a dropout is detected in a given horizontal line, the control signal operates the switch so that it passes to the output terminal demodulated playback signals that have been delayed by one horizontal line period.

REFERENCES:
patent: 3925811 (1975-12-01), Kenney
patent: 4091425 (1978-05-01), Dakin
patent: 4122489 (1978-10-01), Bolger et al.
patent: 4376289 (1983-03-01), Reitmeier et al.
patent: 4409627 (1983-10-01), Eto et al.
patent: 4731675 (1988-03-01), Tachibawa
patent: 4755887 (1988-07-01), Deaver et al.
patent: 4792953 (1988-12-01), Pasdera et al.
patent: 4851934 (1989-07-01), Takeuchi et al.

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