Transmission system

Claim 2

A transmitter for the transmission of signals comprising a source of information signals having a predetermined frequency bandwidth, a source of a pseudorandom pulsatory signal having a predetermined periodic pulse pattern, being within said frequency bandwidth and having an amplitude substantially less than said information signals, means for linearly Combining said information signals and pulsatory signal to produce an output signal in which said information signals and pulsatory signals occur simultaneously and without frequencey separation, and means for transmitting said output signal.

Claim 3

A transmitter as claimed in claim 1 wherein said information signal comprises bivalent pulses, and further comprising means for converting a bivalent pulse series into a multivalent pulse series coupled to an input of said combining means.

Claim 4

A transmitter as claimed in claim 2 wherein the pulse pattern generator comprises a feed back shift register having a number of shift register elements, and a clock pulse generator for producing clock pulses connected thereto, said information signal pulses occuring at instants which coincide with said clock pulses, and being applied to a code converter, said code converter comprising a delaying network and a second linear combination device coupled to said delaying network for receiving said information pulses directly and through said delaying network, said delaying network comprising a shift register having more than two cascade-arranged shift register elements shifted by the clock pulse generator connected to the shift register of the pulse pattern generator.

Claim 5

A transmitter as claimed in claim 3, wherein said second linear combination device in the code converter comprises a linear difference producer, and the number of shift register elements of the shift register in the code converter is equal to the number of shift periods occurring per period of the produced pulse pattern multiplied by an integer number.

Claim 6

A transistor as claimed in claim 1 wherein said pseudorandom signal source comprises a shift register having a plurality of cascade-arranged shift register elements, a modulo-2 adder coupled between adjacent shift resistor elements, the output of the shift register being fed back to the input and to the modulo-2-adder, and a clock pulse generator connected to said elements.

Claim 7

A transmitter as claimed in claim 5 further comprising a starting pulse source coupled to the input of the shift register.

Claim 8

A transmitter as claimed in claim 1 wherein said source of an information signal comprises a plurality of individual information signal sources and further comprising a commutator coupled to said individual signal sources, said combination device being coupled between said commutator and said transmission means.

Claim 9

A transmitter as claimed in claim 7 wherein said source of pulse signals comprises a plurality of coupled shift register elements and an AND gate having inputs coupled to the outputs of said shift register elements and an output coupled to control said commutator.

Claim 10

A transmitter as claimed in claim 1 wherein said source of an information signal comprises a plurality of individual information signal sources and said combination means comprises a plurality of individual combination means coupled to said information signal sources respectively, and to said pulse source, and further comprising a commutator coupled between said individual combination means and said transmitting means.

Claim 11

A transmitter as claimed in claim 9 wherein said source of pulse signals comprises a plurality of coupled shift register elements and an AND gate having inputs coupled to the outputs of said shift register elements and an output coupled control said commutator.

Claim 12

A transmitter as claimed in claim 1 further comprising a clock pulse generator and wherein said information signal comprises pulses the instants of occurrence of which coincide with the clock pulses, said main information pulses being arranged in successive groups of constant length and having group synchronization pulses, wherein said group synchronization pulses supplied by the main information source set the pulse pattern generator into a selected condition and the pulse pattern as a group synchronization signal is combined in the linear combination device with the main informatIon pulses.

Claim 13

A transmitter as claimed in claim 1 further comprising a preemphasis network coupled between said source of information signals and said combining means.

Claim 14

A receiver comprising means for simultaneously receiving within the same bandwidth information signals and a pseudorandom pulsatory signal having a periodic pulse pattern and an amplitude substantially less than said information signals, a source of a local pulsatory signal having the same pulse pattern as the received pulsatory signal, modulator means, means applying said local pulsatory signal and said received signals to said modulator means to produce a control signal, means applying said control signal to said source of local pulsatory signal for synchronizing said local pulsatory signal with said received pulse signal, an output circuit, and means responsive to the synchronization of said local pulsatory signal with said received pulsatory signal for applying said received signals to said output circuit.

Claim 15

A receiver comprising means for simultaneously receiving within the same bandwidth information signals and a pseudorandom pulsatory signal having a periodic pulse pattern and an amplitude substantially less than said information signals, a source of a local pulsatory signal having the same pulse pattern as the received pulsatory signal, modulator means, means applying said local pulsatory signal and said received signals to said modulator means to produce a control signal, means applying said control signal to said source of local pulsatory signal for synchronizing said local pulsatory signal with said received pulse signal, an output circuit, and means responsive to the synchronization of said local pulsatory signal with said received pulsatory signal for applying said received signals to said output circuit.

Claim 16

A receiver as claimed in claim 13 wherein said applying means comprises a filter and a frequency-determining member coupled to said filter, the output of the modulation device being connected to said filter, said frequency-determining member being coupled to said source of local pulse signals.

Claim 17

A receiver as claimed in claim 14, wherein the source of local pulse signals comprises a shift register having a number of cascade-arranged shift register elements, a modulo-2-adder coupled between said elements, the output of the shift register being fed back to the input and to the modulo-2-adder, and a clock pulse generator coupled to said elements, the contents of the shift register elements being shifted by said clock pulse generator connected thereto.

Claim 18

A receiver as claimed in claim 15 further comprising a pulse regenerator coupled to said output circuit, and an AND gate coupled to said shift register elements, the output signal of said AND gate being applied to said output circuit as a group synchronization signal, the clock pulses of the local pulse source being applied to the pulse regenerator for control purposes.

Claim 19

A receiver as claimed in claim 14 wherein the modulation means comprises a modulo-2-adder and a limiter coupled to said adder.

Claim 20

A receiver as claimed in claim 17, wherein said modulation means comprises a second modulo-2-adder having an input coupled to the output of the limiter, and said linear difference produce, the output terminals of said modulation modulo-2-adders being coupled to the inputs of said linear difference producer, the output of said difference producer being coupled to the smoothing filter.

Claim 21

A receiver as claimed in claim 14 further comprising a commutator having an input coupled to the modulation device.

Claim 22

A receiver as claimed in claim 19 further comprising an AND gate coupled to each shift register element, the output signal being applied to control said commutator.

Claim 23

A receiver as claimed in claim 14 further comprising a commutator coupled to said receiving means and a third linear combination device coupled to the outputs of said commutator and to the modulation device.

Claim 24

A receiver as claimed in claim 21 further comprising an AND gate coupled to each shift register element, the output signal of said gate being applied to control the commutator.

Claim 25

A receiver as claimed in claim 13 further comprising a second linear difference producer for receiving said input signals and said local pulse signals and being coupled to said output circuit.

Claim 26

A receiver as claimed in claim 23 wherein said information signal comprises speech signals, and further comprising a de-emphasis network coupled between the second linear difference producer and said output circuit.

Claim 27

A receiver as claimed in claim 13 wherein said responsive means comprises a smoothing filter coupled between said modulation device and said output circuit.

Claim 28

A receiver as claimed in claim 13 wherein said maIn information signals comprises multivalent signals and wherein the receiver further comprises an inverse code converter and means for converting the multivalent pulse series into a bivalent pulse series.

Claim 29

A transmission system for the transmission of signals in a predetermined band, comprising a transmitter, a receiver, and a transmission path between said transmitter and receiver, said transmitter comprising a source of information signals, a source of a pulsatory signal having a predetermined periodic pulse pattern that is not correlated with said information signals and an amplitude substantially less than said information signals, means for linearly combining said information signals and pulsatory signal to produce an output signal in which said information signals and pulsatory signals occur simultaneously and without frequency separation within a predetermined bandwith, and means applying said output signal to said path; said receiver comprising a source of a local pulsatory signal corresponding to the pulsatory signal produced in said transmitter, modulator means, means applying said local pulsatory signal and signals received from said path to said modulator means to produce a control signal, means applying said control signal to said source of local pulsatory signal for synchronizing said local pulsatory signal, an output circuit, and means responsive to the reception of a pulsatory signal corresponding to said local pulsatory signal for applying signals from said path to said output circuit.

Claim 30

A transmission system for the transmission of signals in a predetermined band, comprising a transmitter, a receiver, and a transmission path between said transmitter and receiver, said transmitter comprising a source of information signals, a source of a pulsatory signal having a predetermined periodic pulse pattern that is not correlated with said information signals and an amplitude substantially less than said information signals, means for linearly combining said information signals and pulsatory signal to produce an output signal in which said information signals and pulsatory signals occur simultaneously and without frequency separation within a predetermined bandwith, and means applying said output signal to said path; said receiver comprising a source of a local pulsatory signal corresponding to the pulsatory signal produced in said transmitter, modulator means, means applying said local pulsatory signal and signals received from said path to said modulator means to produce a control signal, means applying said control signal to said source of local pulsatory signal for synchronizing said local pulsatory signal, an output circuit, and means responsive to the reception of a pulsatory signal corresponding to said local pulsatory signal for applying signals from said path to said output circuit.