H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/195
H04L 25/08 (2006.01) H04L 25/22 (2006.01)
Patent
CA 1099368
PHN 8782 3.3.78 ABSTRACT: An electronic transmitter for direct current telegraphy by means of polar line currents comprises a switching circuit for selectively connecting one of the two poles of a telegraphy battery through a unipolar constant current source to a telegraph line, and an output filter having a capacitor in parallel with the telegraph line. The higher frequencies in the telegraphy signals are sufficiently suppressed to keep the noise level in adjacent telephone lines below a prescribed value because the output filter also comprises two com- plementary branches in parallel with the telegraph line, at least one of the two branches supplying, in response to a polarity transition of the line current supplied by the current source, a correction current pulse hav- ing a polarity opposite to the line current to the tele- graph line. This output filter is assembled from small- sized, low-priced elements so that an efficient miniatu- risation of the electronic transmitter in its entirety can be realized. - 42 -
301609
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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