Telegraphy – Systems – Printing
Patent
1976-02-13
1977-02-01
Robinson, Thomas A.
Telegraphy
Systems
Printing
179 15BS, H04L 500
Patent
active
040063020
ABSTRACT:
A switching arrangement for a data transmission system is described wherein the switching arrangement extends the receiver stop pulse length in time division multiplex transmissions of telegraph signals on a character frame basis. The character frame contains one start pulse, a number m code bits and one stop pulse. The time division multiplex (TDM) signal is applied to a first bistable circuit, and the output signal of the first bistable circuit is applied to a second bistable circuit from which a data signal is emitted to a data sink. A shift register is provided having no fewer than m+3 storage cells in which a first binary digit is stored if a stop signal is applied by means of parallel input terminals to the shift register. Timing pulses applied to the shift register are received in a pulse input. A shift register further includes a serial input terminal over which a second binary digit is read-in where no stop signal is present. A gate having inputs to which are applied the input signal of the m+3.sup.th storage cell of the shift register and the output signal of the first bistable circuit. The gate produces a stop signal. A counter is provided to which are applied the stop signal as a count signal and the output signal of the m+3.sup.th storage cell as a reset signal. The counter produces counter reading signals indicating the reading of the counter. A clock generator or more phase shifted signals are emitted in a square wave pulse form of which one half the unit element length are displaced in proper phase relation by fractions of the unit element length. Phase shifted clock signals as a function of the reading of the counter are used for timing the second bistable circuit.
REFERENCES:
patent: 3463887 (1969-08-01), Ito
patent: 3482044 (1969-12-01), Kaneko
patent: 3525813 (1970-08-01), Taylor et al.
Robinson Thomas A.
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