Video telephone

Details Video telephone Video telephone

1988-06-24

1992-08-04

Brown, Thomas W.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

358 85, H04N 714, H04M 1100

Patent

active

051366282

ABSTRACT:
A video telephone for transmitting video data of a still picture through an audio signal line includes an image pickup tube for picking up a picture of the still picture, an A/D (analog-to-digital) converter for converting the analog output picked up by the image pick-up tube to the form of a digital signal, a memory for storing the output of the A/D converter as video data, a modulating circuit for modulating the video data stored in the memory into a modulated signal of an occupied frequency band corresponding to a transmission band of the signal line, a circuit for transmitting the modulated output of the modulating circuit to the signal line, a circuit for generating a synchronizing pulse and a frequency-dividing circuit for frequency-dividing the color subcarrier signal to provide signals necessary for the A/D converter, the memory, and the modulating circuit, wherein the video data is a signal which results from thinning the picked-up output at a predetermined ratio.

REFERENCES:
patent: 3507981 (1970-04-01), Eilenberger
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4740831 (1988-04-01), Rhodes
patent: 4802003 (1989-01-01), Takei et al.
"Digital Circuits in the video telephone", INSPEC, Phillips Tech. Review, vol. 36, No. 8, pp. 233-241, 1976.

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