U.S. Philips Corporation

Jean P Werts

Robert Bodart

A start-stop signal, such as a telex signal, having a stop polarity which is maintained for a period of time after a start-stop transition, is regenerated as a plurality of signal samples which are stored and then used to form an isochronous output signal. The invention resides in having unequal time intervals between the signal samples so that a range of periods of time for the stop polarity can be catered for to produce an isochronous output-signal of satisfactory duration.

Method of and arrangement for regenerating start-stop signals

Arrangement for restituting selection signals from a received isochronous signal which permits an ample variation in the number of consecutive bits of start polarity A and stop polarity Z, which represent respective values of the selection signals. This arrangement can handle 2, 3 or 4 bits A and 1,2 or 3 bits Z and restitute therefrom the intervals of stop polarity Z with a fixed duration and the intervals of start polarity A with a variable duration between two limits.

Arrangement for restituting selection signals

An arrangement is described wherein the leading edge of an A-pulse in a telex signal is additionally delayed relative to the trailing edge, in order to prevent a specified upper limit from being exceeded at the conversion into an isochronous signal. For Z-pulses, a high upper limit for the number of bits is prescribed which, in cascade connections, may lead to degradation of the Z-pulses. The arrangement further enables, because of an additional delay of the leading edge of the Z-pulse relative to the trailing edge, the maximum number of bits in the isochronous signal to be one less than the maximum permissible number.

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Brussels, Belgium

Jean P Werts