H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/12
H04J 3/02 (2006.01) H04J 3/12 (2006.01)
Patent
CA 1047180
ABSTRACT OF THE DISCLOSURE In a carrier system having a plurality of relatively wide band (or voice) channels which are time-division multi- plexed and represented by N sequential coded pulses for each channel, it is sometimes desirable that the individual pulses of one or more of the relatively wide band channels be used for information of data. In such past arrangement, only (N - 1) of the pulses were used for transmitting information. The Nth pulse was reserved as a needed keep-alive pulse to provide proper operation of repeaters in the pulse coded system. The present arrangement provides means at the trans- mitter for detecting when (N - 1) of the channel pulses are all in an undesired code condition, and transmitting the needed keep-alive pulse as the Nth pulse. If any one of the (N - 1) channel pulses is in the desired code condition, the Nth pulse can transmit information. At the receiver, means are provided for detecting when the (N - 1) channel pulses are all in the undesired code condition, and for causing the Nth pulse to continue producing the last representative pulse received. If any one of the (N - 1) channel pulses is in the desired code condition, the Nth channel pulse represents the information actually transmitted.
230742
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