System for simultaneous long-distance vision of video pictures r

Details System for simultaneous long-distance vision of video pictures r System for simultaneous long-distance vision of video pictures r

1992-09-16

1994-05-03

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 331, H04N 576

Patent

active

053092481

ABSTRACT:
A system for simultaneous long-distance vision of video pictures reproduced by a transmitting videorecorder and a receiving videorecorder, which comprises a transmitting subsystem (1) and a receiving subsystem (2), each arranged in different and mutually distant places; the transmitting subsystem (1) comprises a transmitting video recorder (TX), in which a video cassette is loaded which video cassette has on one of its two audio tracks a position code, a first electronic exchange (100) of a sequence of data (D) identifying position and state of the transmitting video recorder (TX), which first electronic exchange (100) is connected to a telephone line (LT) through a modem device (M1); the receiving subsystem (2) comprises a receiving video recorder (RX), in which a video cassette identical to the one loaded in the transmitting video recorder (TX) is loaded, having on one of its two audio tracks a position code which is identical to the one loaded on the transmitting video recorder (TX), a second electronic exchange (200) of control, reception, comparison and processing of the data sequence (D) identifying position and state of the transmitting video recorder (TX), coming from the first electronic exchange (100), with respect to the sequence of data (DR) identifying the position of the receiving video recorder (RX); the second electronic exchange (200) being connected to the receiving video recorder (RX) and also to a telephone line (LT) through a modem device (M2).

REFERENCES:
patent: 4618895 (1986-10-01), Wright
patent: 4675757 (1987-06-01), Block
patent: 4928168 (1990-05-01), Iwashita
Berlin, "The Phase Detector", 1988, pp. 24-26.

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