Telegraphy – Systems
Patent
1974-10-18
1976-12-28
Robinson, Thomas A.
Telegraphy
Systems
178 26R, 179 90K, H04L 1100, H04M 130
Patent
active
040003639
ABSTRACT:
A teleprinting apparatus which eliminates a dial switch for connection to a remote subscriber and which substitutes a circuit arrangement which utilizes the keyboard through a coding system to generate pulse trains for connection to the remote subscriber. A selection pulse generator is set in operation by a "proceed to select" signal which is supplied with signals emitted by a keyboard and derived from a counter pulse train of constant repetition frequency. In this way selection pulses are produced, the number of which is determined by the key which is being operated. The number is actually fixed by the use of a comparator which compares the keyboard signal with the output of a counter which is counting the pulse train.
REFERENCES:
patent: 3046526 (1962-07-01), Scantlin
patent: 3436477 (1969-04-01), Ghiringhelli
patent: 3585596 (1971-06-01), Rosenblatt
patent: 3787639 (1974-01-01), Battrick
Robinson Thomas A.
Siemens Aktiengesellschaft
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