Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1990-08-09
1993-04-13
Dwyer, James L.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
358 85, H04N 712
Patent
active
052029573
ABSTRACT:
A full motion video telephone system combines mechanical scanning from the early era of television with modern video and digital communications technology for operation over conventional loaded bandwidth limited telephone lines. A camera pickup mechanical disk scanner causes scanning of an object in picture frames with an image resolution in the range of 30-90 scan lines per frame and full motion resolution in the range of 15-30 frames per second. A photomultiplier sensor generates an analog serial scanning signal with a bandwidth within the analog frequency range of 0-90 kHz. The synchronous motor of the mechanical scanner is synchronized with a first clock signal generated from a reference clock standard. Analog to digital conversion permits transmission by a high speed modem on the telephone lines. The receiving station is similar permitting full motion image reproduction with acceptable resolution. The camera receiver mechanical scanner is synchronized with respect to the same reference clock standard so that the camera pickup and camera receiver are in phase.
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Dwyer James L.
Future Communications
Kane Daniel H.
Woo Stella
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