Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-09-01
1980-07-15
Konick, Bernard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791004D, 360 77, H04N 576, G11B 338
Patent
active
042131480
ABSTRACT:
In a video disc playback apparatus, an active tracking control system is provided using a single pilot signal. The pilot signal is recorded on an information track of a video disc record such that each convolution of the track contains a non-integral number of cycles of the pilot signal. The phase of the pilot signal in a given convolution bears a known relationship to the phase of the pilot signals in the convolutions preceding and succeeding the given convolution. The given convolution includes information representing a reference phase signal. The phase of the recovered reference signal is compared to the phase of the recovered pilot signal which may include phase information from adjacent convolutions to provide an error signal. Pickup positioning apparatus is made responsive to the error signal for maintaining the pickup on the desired path along the information track.
REFERENCES:
patent: 3963860 (1976-06-01), Burrus
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.
Konick Bernard
McElheny Jr. Donald
RCA Corporation
Tripoli Joseph S.
Whitacre Eugene M.
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