External synchronizing method and apparatus for information tran

Details External synchronizing method and apparatus for information tran External synchronizing method and apparatus for information tran

1984-08-07

1986-07-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, 358149, 375107, H04N 504

Patent

active

046033521

ABSTRACT:
In an information transmission system including transmitters, a receiver, and a transmission line for transmitting information signals from the transmitters to the receiver, the transmission line is shared by the information signals and external sync signals which are adapted to synchronize the transmitters to each other. The external sync signals have a voltage level higher than a maximum voltage level of the information signals or lower than a minimum voltage level of the same, and are transmitted to the transmitters over the transmission line by using blanking level portions of the information signals. The external sync signals are separated from the information signals based on their level difference and, then, applied to the transmitters. Amplifier circuits for blocking the propagation of signals toward the transmitters are installed in the transmission line, while bypass circuits are connected to the transmission line each in parallel to the associated amplifier circuit so as to allow only the external sync signals to be transmitted toward the transmitters based on a signal voltage level.

REFERENCES:
patent: 3816658 (1974-06-01), Vidovic
patent: 4333103 (1982-06-01), Koiwa et al.
patent: 4489348 (1984-12-01), Lepley

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