Delta-modulated transmission system with prediction of voice development and transmission of only coordination and error signals

Claim 1

A system for transmitting information by using coded binary pulses, consisting of an emitting station, a transmission circuit and a receiving station; at the emitting station, a source of information signal providing an analogue signal represented by a voltage, a device emitting synchronizing signals, a delta-modulated binary coder with an input for the analogue signal and an output, means in said coder to sample with a determined period of repetition the instantaneous amplitude of said analogue signal and to obtain a series of coded pulses each having one of the values 1 and 0 depending upon the differences between a sampled amplitude and the amplitude of a signal provided from the pulse previously generated from the said series, first preserving means to preserve for a predetermined time each group of m successive coded pulses pertaining to said series, a logic predicting circuit having a number of inputs corresponding to the number m of said group to receive simultaneously said preserved group of pulses and having an output, means in said predicting circuit to feed the output with a resulting predicted binary coded pulse of a value depending on the composition of said group, a comparing device with a first input and a second input and with an output, the said predicted pulse being applied to said first input at the same time that the pulse immediately following said group is applied to said second input, whereby the said output of the comparing device produces one of two binary error pulses having either the value 1 when the two last pulses simultaneously applied to the comparing device are different or the value 0 when said two last pulses are identical, and means to connect the output of the comparing device to the transmission circuit; at the receiving station, a second comparing device identical with the comparing device of the emitting station and having a first input and a second input and an output, the transmission circuit connected to the said first input of said second comparing device, a second predicting logic circuit identical with the predicting circuit of the emitting station, pulses generated by said second predicting circuit being fed to the second input of the second comparing device, means in said second comparing device to reconstitute from the pulses entered therein, a series of pulses, at the output of the second comparing device second preserving means to preserve each group of m pulses of said reconstituted series for a predetermined time, the second predicting logic circuit having a number of inputs corresponding to the number m of said grouP, connections between outputs of the second preserving means to the respective inputs of said second predicting circuit to simultaneously feed said preserved pulses to said latter respective inputs; and means connected to the second comparing device output to reconstitute the analogue information transmitted.

Claim 2

A system for transmitting information by using coded binary pulses, consisting of an emitting station, a transmission circuit and a receiving station; at the emitting station, a source of information signal providing an analogue signal represented by a voltage, a device emitting synchronizing signals, a delta-modulated binary coder with an input for the analogue signal and an output, means in said coder to sample with a determined period of repetition the instantaneous amplitude of said analogue signal and to obtain a series of coded pulses each having one of the values 1 and 0 depending upon the differences between a sampled amplitude and the amplitude of a signal provided from the pulse previously generated from the said series, first preserving means to preserve for a predetermined time each group of m successive coded pulses pertaining to said series, a logic predicting circuit having a number of inputs corresponding to the number m of said group to receive simultaneously said preserved group of pulses and having an output, means in said predicting circuit to feed the output with a resulting predicted binary coded pulse of a value depending on the composition of said group, a comparing device with a first input and a second input and with an output, the said predicted pulse being applied to said first input at the same time that the pulse immediately following said group is applied to said second input, whereby the said output of the comparing device produces one of two binary error pulses having either the value 1 when the two last pulses simultaneously applied to the comparing device are different or the value 0 when said two last pulses are identical, and means to connect the output of the comparing device to the transmission circuit; at the receiving station, a second comparing device identical with the comparing device of the emitting station and having a first input and a second input and an output, the transmission circuit connected to the said first input of said second comparing device, a second predicting logic circuit identical with the predicting circuit of the emitting station, pulses generated by said second predicting circuit being fed to the second input of the second comparing device, means in said second comparing device to reconstitute from the pulses entered therein, a series of pulses, at the output of the second comparing device second preserving means to preserve each group of m pulses of said reconstituted series for a predetermined time, the second predicting logic circuit having a number of inputs corresponding to the number m of said grouP, connections between outputs of the second preserving means to the respective inputs of said second predicting circuit to simultaneously feed said preserved pulses to said latter respective inputs; and means connected to the second comparing device output to reconstitute the analogue information transmitted.