Apparatus for reading a record carrier

Details Apparatus for reading a record carrier Apparatus for reading a record carrier

1977-01-13

1978-08-22

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

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H04N 578

Patent

active

041092775

ABSTRACT:
Apparatus for reading a record carrier on which a television signal is recorded. In order to ensure an accurate time error measurement for a time error correction device, use is made of a burst signal which is locked to the horizontal synchronizing pulses. Said burst signal may be constituted by the color burst signal or an additional burst signal which is superimposed on the horizontal synchronization pulse. In order to obtain a pilot signal for the time error measurement a keying signal is generated with the aid of a generator which is controlled by the horizontal synchronizing pulses, the beginning of said keying signal being situated within the time interval of the burst signal. The first zero passage of the burst signal which appears after the beginning of said keying signal is employed as a pilot signal for the time error measurement. In order to increase the reliability of the system an automatic correction system is provided which ensures that the beginning of the keying signal lies halfway between two consecutive zero passages of the burst signal.

REFERENCES:
patent: 3921202 (1975-11-01), Dann et al.
I.E.E.E. Transactions on Broadcasting Coleman, vol. BC-17, No. 1, Mar. 1971, pp. 29-36.

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