Abstract A process is described for the transmission of binary coded data according to time multiplex principles. The code element of least duration is scanned a number of times within each transmitting time. If a change in the modulation characteristic should occur, this is indicated by a registered count proportional to the elapsed time from the last transmitting time impulse to instant when the change occurred. The transmission of the message will then start simultaneously with the transmitting time impulse immediately following the modulation characteristic change. The message is data indicating when a change in characteristic occurred. The message will, of course, be transmitted in the one of the time channels which corresponds with the latter mentioned transmitting time impulse. Within the binary code group, by which a message is transmitted, the pulses giving information as to the point in time when a modulation change occurred are preceded by a start pulse or bit, which has a polarity or level corresponding to the new polarity or level which now exists after the change in the modulation characteristic. Also, after the transmission of the data indicating the point in time at which a change occurred, the existing polarity or level is again transmitted.
A process for the transmission of message signals originating in a plurality of communication channels over a common communication channel using the time multiplex principle, wherein the information in each channel is caused to be transmitted by a transmitting timing pulse occurring at the allotted time for that channel, said pulses being repeated at a predetermined rate, and wherein the message signal in each of said channels comprises a train of steps with a change in level being indicative of message content, comprising the steps of: scanning the message step of least duration in each channel a plurality of times between transmitting times for that channel, registering a count in each channel for a change in level occurring in said channel and noted during said scanning step, said count being proportional to the elapsed time between the last occurring transmitting timing pulse and the occurrence of said change in polarity, transmitting data regarding said count commencing with the occurrence of the next transmitting timing pulse following said change in polarity, said data being a binary code group formed from said count, said binary code group being transmitted using a plurality of succeeding transmitting timing pulses as needed according to the number of characters in said binary code group and arranging a start bit to precede the portion of said binary code group indicating the time of said change in level, said start bit having a level corresponding to the level of said scanned signal subsequent to said change in level, a bit corresponding in level to said start bit being transmitted following said binary code group, if there has been no change in level of said message signal upon the occurrence of the next succeeding transmitting timing pulse.
Claim 2
Dependent Claim
288 words
A process for the transmission of message signals originating in a plurality of communication channels over a common communication channel using the time multiplex principle, wherein the information in each channel is caused to be transmitted by a transmitting timing pulse occurring at the allotted time for that channel, said pulses being repeated at a predetermined rate, and wherein the message signal in each of said channels comprises a train of steps with a change in level being indicative of message content, comprising the steps of: scanning the message step of least duration in each channel a plurality of times between transmitting times for that channel, registering a count in each channel for a change in level occurring in said channel and noted during said scanning step, said count being proportional to the elapsed time between the last occurring transmitting timing pulse and the occurrence of said change in polarity, transmitting data regarding said count commencing with the occurrence of the next transmitting timing pulse following said change in polarity, said data being a binary code group formed from said count, said binary code group being transmitted using a plurality of succeeding transmitting timing pulses as needed according to the number of characters in said binary code group and arranging a start bit to precede the portion of said binary code group indicating the time of said change in level, said start bit having a level corresponding to the level of said scanned signal subsequent to said change in level, a bit corresponding in level to said start bit being transmitted following said binary code group, if there has been no change in level of said message signal upon the occurrence of the next succeeding transmitting timing pulse.