Apparatus for reproducing frequency-division multiplexed video F

Details Apparatus for reproducing frequency-division multiplexed video F Apparatus for reproducing frequency-division multiplexed video F

1988-04-01

1989-08-15

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358343, 358328, 358330, 369 44, H04N 576, G11B 700

Patent

active

048580244

ABSTRACT:
A recorded-information reproducing apparatus, such as a video disk player, in which interference generated as a result of pulse-width modulation multiplexing of a luminance signal and eight-to-fourteen modulation digital audio signal is recorded on the recording medium. A low-pass filter is provided to filter the signal read out from the recording medium having a cut-off frequency higher than a white peak of the video FM signal and lower than the frequency of the color subcarrier contained in the upper first sideband of the video FM signal. The filter may take the form of either an electronic filter which filters the read-out signal following detection or a diaphragm for controlling the aperture of an objective lens through which the optical read-out signal passes.

REFERENCES:
patent: 4389681 (1983-06-01), Tanaka et al.
patent: 4707818 (1987-11-01), Suzuki et al.
Japanese Abstract 58-225784, 12-27-83.

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