Information recording and retrieval apparatus

Details Information recording and retrieval apparatus Information recording and retrieval apparatus

1976-02-03

1978-01-03

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 1791004D, 360 72, 250202, 274 9RA, 360 77, H04N 576, G11B 2108

Patent

active

040670449

ABSTRACT:
An information signal is recorded on information tracks wobbling along concentric circles or a spiral line on a recording disc in superposed relation with a standard signal whose frequency varies depending on the recorded position on the disc. Desired information can be selectively reproduced accurately at a high speed by applying an external signal having the same frequency as that of the standard signal recorded on the recording disc together with the desired information, comparing the frequency of the standard signal being reproduced with that of the externally applied signal, selecting the desired information track on the basis of the result of frequency comparison for reproducing the desired information, and after the selection of the desired information track, carrying out fine tracking control while comparing the envelope of the reproduced information signal with the reproduced standard signal, so that the reproducing beam spot can accurately track the desired information track.

REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3662363 (1972-05-01), Chertok
patent: 3845500 (1974-10-01), Hart
patent: 3876827 (1975-04-01), Janssen
patent: 3931457 (1976-01-01), Mes
patent: 3931460 (1976-01-01), Watson

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