Videophone system having a camera and a shutter

Details Videophone system having a camera and a shutter Videophone system having a camera and a shutter

1996-09-24

1999-07-27

Garber, Wendy

Television

Camera, system and detail

Power supply

348367, 348371, H04N 5222, H04N 5225

Patent

active

059299096

ABSTRACT:
A videophone system having an electronically controlled shutter to vary the amount of light falling onto the target by a shutter, e.g., for a greater or lesser length of time during a short exposure time rather than b y means of a controlled mechanical aperture. Data reduction is used for the transmitted signal, a control circuit is used for the exposure time, and the mains power supply, which produces ambient light, are coupled by means of a PLL circuit so that the exposure time occurs at the same phase of the mains voltage. In this way, interference occurring when data reduction is used for the signal to be transmitted is avoided and macroblocks are not formed when no difference signal is present.

REFERENCES:
patent: 3798367 (1974-03-01), Schneider
patent: 4076414 (1978-02-01), Tulbert
patent: 4532550 (1985-07-01), Bendell et al.
patent: 4597015 (1986-06-01), Johnson
patent: 4774588 (1988-09-01), Noda et al.
patent: 4913547 (1990-04-01), Moran
patent: 4992855 (1991-02-01), Takei
patent: 5406323 (1995-04-01), Tanigaki et al.
JP Patents Abstracts of Japan 2-179075 A. E-984, Sep. 27, 1990.
JP Patents Abstracts of Japan 56-149183 A. E-95, Feb. 19, 1982.

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