Recording/playback apparatus facilitating track skip detection

Details Recording/playback apparatus facilitating track skip detection Recording/playback apparatus facilitating track skip detection

1978-05-22

1980-04-15

Moffitt, James W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791004D, H04N 576, G11B 338

Patent

active

041986580

ABSTRACT:
A recording signal containing a main carrier modulated in accordance with picture signal information inclusive of synchronizing components, and an auxiliary carrier modulated in accordance with sound signal information and a pilot signal, is impressed on a video disc record along a spiral track on the surface thereof. The frequencies of the synchronizing components and the pilot signal are such that an integral number of synchronizing components and a non-integral number of pilot signal cycles occupy each convolution of the spiral track. The playback apparatus includes circuitry coupled to the output of a player stylus for recovering the pilot signal, and further includes circuitry responsive to the deviations in the phase of the recovered pilot signal for developing an error signal indicative of the magnitude and sense of a disruption in the regular progression of the stylus along the spiral track due to a sudden shift in the radial location of the stylus. A suitable track skipper mechanism is activated in response to the error signal to radially shift the stylus in a manner that offsets the disruption in the regular progression thereof.

REFERENCES:
patent: 3963860 (1976-06-01), Burrus
patent: 3963861 (1976-06-01), Crooks
patent: 3977021 (1976-08-01), Kobayashi et al.
patent: 3993863 (1976-11-01), Leedom et al.
patent: 4018984 (1977-04-01), Keizer
patent: 4018987 (1977-04-01), Keizer
patent: 4022968 (1977-05-01), Keizer
patent: 4067044 (1978-01-01), Maeda et al.

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