Video modem for transmitting video data over ordinary telephone

Details Video modem for transmitting video data over ordinary telephone Video modem for transmitting video data over ordinary telephone

1994-12-01

1997-04-15

Peng, John K.

Television

Special applications

Manufacturing

348 12, 348388, H04N 710

Patent

active

056214553

ABSTRACT:
An apparatus and method is provided for modulating and transmitting full-motion, television-quality color video signals along with digital data signals over a pair of ordinary unshielded twisted pair telephone wires without interfering with normal telephone data on the wires. The invention is characterized by a transmission method involving frequency modulation of a baseband video signal and subsequent filtering to suppress an upper sideband corresponding to a color component of the original video signal. The filtered signal is received from the telephone wires at a different location, filtered, demodulated and provided to a display device. Full-duplex operation over the same pair of wires is possible, such that two video signals may be simultaneously transmitted, each signal having an approximate bandwidth of 6 MHz and shifted to a desirable non-interfering frequency location within the approximately 20 MHz of usable bandwidth on the telephone wires. No pre-emphasis or de-emphasis is required to achieve good quality video transmission. The system has many applications including video distribution, conferencing, and communications.

REFERENCES:
patent: 3974337 (1976-08-01), Tatsuzawa
patent: 4054910 (1977-10-01), Chou et al.
patent: 4589011 (1986-05-01), Rzeszewski
patent: 4955048 (1990-09-01), Iwamura et al.
patent: 5010399 (1991-04-01), Goodman et al.
patent: 5164980 (1992-11-01), Bush et al.
patent: 5283637 (1994-02-01), Goolcharan

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