Transmission system for still-picture TV telephone

Details Transmission system for still-picture TV telephone Transmission system for still-picture TV telephone

1990-03-29

1991-11-05

Dwyer, James L.

Telephonic communications

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

Including fiber optic link within telephone network

379 96, 358 85, H04M 1100

Patent

active

050635875

ABSTRACT:
A still-picture TV telephone system for transmitting and receiving, via a telephone circuit, a still picture taken by a camera; a picture signal stored in a memory is modulated in phase and amplitude digitally and is offered or supplied to the telephone circuit during talking in voice. To superposing the talk in voice also during offering of the picture signal, the voice and picture signals are divided by frequency band. The frequency band of the voice signal is partially restricted, and the picture signal is inserted in the omitted band, during which time the picture signal is restricted in band by setting the band rate frequency to be lower than the carrier signal frequency when modulating the phase and amplitude. The picture signal is further restricted in band by a low-pass filter so that the voice and picture signals are separated by band so as not to overlap each other at the same frequency band.

REFERENCES:
patent: 3517117 (1970-06-01), Woodbury
patent: 4258387 (1981-03-01), Lemelson et al.
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4715059 (1987-12-01), Cooper-Hart et al.
patent: 4739413 (1988-04-01), Meyer
patent: 4849811 (1989-07-01), Kleinerman
patent: 4918718 (1990-04-01), Emmons et al.

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