Arrangement for the transmission of information signals by pulse code modulation

Claim 2

A transmitter for the transmission of information signals by pulse code modulation, comprising a pulse modulator for providing output pulses, the output pulses from said pulse modulator comprising the output of said transmitter, a clock pulse generator connected to an input of the modulator, a pulse series analyzer means connected to the output of the clock pulse generator and to the output of the pulse modulator for analyzing successively occurring pulse series from the modulator within fixed time intervals of at least three successive pulses from the clock pulse generator and for supplying a pulsatory output signal in response to a modulator output pulse series exceeding a predetermined modulation index within the fixed time intervals, a first non-linear integrating network connected to the output of the pulse series analyzer for supplying a continuously variable dynamic control signal, the first non-linear integrating network comprising a storage element and a non-linear resistance element connected to the storage element, the first non-linear integrating network having a time constant that decreases with increasing signal level, a switched supply source connected to the output of the first non-linear integrating network, means connecting the pulse Modulator output to the switched supply source for switching the output of the first non-linear integrating network in the rhythm of the pulsatory output from the pulse series analyzer, the dynamic control signal being derived from the non-linear resistance element of the first nonlinear integrating network, a second integrating network connected to the output of the switched supply source, a difference producer having a first input connected to the output of the second integrating network and having a second input for receiving the information signals to be transmitted, the output of the difference producer being connected to the pulse modulator.

Claim 3

A transmitter as claimed in claim 1, wherein the storage element of the first non-linear integrating network comprises a linear capacitor, and wherein the non-linear resistance element of the first non-linear integrating network comprises a junction of a semiconductor device connected in parallel with the capacitor.

Claim 4

A transmitter as claimed in claim 1, wherein the storage element of the first non-linear integrating network comprises a capacitor, and wherein the non-linear resistance element of the first non-linear integrating network comprises a cascade circuit of a plurality of semiconductor junctions, a low input resistance amplifier, means connecting the input of the low input resistance amplifier to the cascade circuit, the low resistance amplifier supplying the dynamic control signal.

Claim 5

A transmitter as claimed in claim 1, wherein the storage element of the first non-linear integrating network comprises a capacitor, and wherein the non-linear resistance element of the first non-linear integrating network comprises the input resistance of a current mirror circuit.

Claim 6

A transmitter as claimed in claim 4, wherein the input resistance of the current mirror circuit comprises a diode junction, the first non-linear integrating network further comprising a transistor whose collector-electrode constitutes the output of the current mirror, the diode junction being connected in parallel to the base-emitter junction of said transistor.

Claim 7

A transmitter as claimed in claim 4, wherein said switched supply source is connected to the output of the current mirror and to the modulator for supplying the second integrating network sequentially with equal and oppositely directed currents.

Claim 8

A transmitter as claimed in claim 2, further comprising a linear resistor connected in series with the non-linear resistance element of the first non-linear integrating network.

Claim 9

A transmitter as claimed in claim 1, further comprising a direct voltage supply source connected to the first non-linear integrating network for providing a minimum dynamic control signal.

Claim 10

A transmitter as claimed in claim 2, further comprising a direct voltage supply source, a first transistor, the collector and emitter electrodes of the first transistor being connected in parallel with the capacitor, two further transistors, means connecting the emitter electrode of the first transistor to a terminal of the direct voltage supply source through the emitter-collector paths of the two further transistors, a resistor, a first diode, a second diode, means connecting the resistor and first and second diodes in series between the two terminals of said direct voltage supply source, means connecting the connection point of the resistor and one of said diodes to the interconnected base electrodes of said two further transistors, the common terminal of the first and second diode being connected to the base of the first transistor.

Claim 11

A receiver for receiving information signals transmitted by pulse code modulation, comprising a pulse modulator comprising the input of a receiver for providing output pulses, a clock pulse generator connected to an input of the modulator, a pulse series analyzer means connected to the output of the clock pulse generator and to the output of the pulse modulator for analyzing successively occurring pulse series from the moduLator within fixed time intervals of at least three successive pulses from the clock pulse generator and for supplying a pulsatory output signal in response to a modulator output pulse series exceeding a predetermined modulation index within the fixed time intervals, a first integrating network connected to the output of the pulse series analyzer for supplying a continuously variable dynamic control signal, the first integrating network comprising a storage element and a non-linear resistance element connected to the storage element, the first integrating network having a time constant decreasing with increasing signal level, a switched supply source connected to the output of the first integrating network, means connecting the pulse modulator output to the switched supply source for switching the output of the first integrating network in the rhythm of the pulsatory output from the pulse series analyzer, the dynamic control signal being derived from the non-linear resistance element of the first integrating network, and a second integrating network connected to the output of the switched supply source, the second integrating network comprising the output of the receiver.

Claim 12

A receiver for receiving information signals transmitted by pulse code modulation, comprising a pulse modulator comprising the input of a receiver for providing output pulses, a clock pulse generator connected to an input of the modulator, a pulse series analyzer means connected to the output of the clock pulse generator and to the output of the pulse modulator for analyzing successively occurring pulse series from the moduLator within fixed time intervals of at least three successive pulses from the clock pulse generator and for supplying a pulsatory output signal in response to a modulator output pulse series exceeding a predetermined modulation index within the fixed time intervals, a first integrating network connected to the output of the pulse series analyzer for supplying a continuously variable dynamic control signal, the first integrating network comprising a storage element and a non-linear resistance element connected to the storage element, the first integrating network having a time constant decreasing with increasing signal level, a switched supply source connected to the output of the first integrating network, means connecting the pulse modulator output to the switched supply source for switching the output of the first integrating network in the rhythm of the pulsatory output from the pulse series analyzer, the dynamic control signal being derived from the non-linear resistance element of the first integrating network, and a second integrating network connected to the output of the switched supply source, the second integrating network comprising the output of the receiver.

Claim 13

A receiver as claimed in claim 10, wherein the storage element of the first integrating network comprises a linear capacitor connected to the output of the switched supply source, and wherein the non-linear resistance element of the first integrating network comprises a semiconductor junction connected in parallel with the capacitor.

Claim 14

A receiver as claimed in claim 10, wherein the storage element of the first integrating network comprises a capacitor, and wherein the non-linear resistance element comprises a cascade circuit of a plurality of semi-conductor junctions, and a low input resistance amplifier for supplying the dynamic control signal, the cascade circuit being applied to the input of the amplifier.

Claim 15

A receiver as claimed in claim 10, wherein the storage element of the first integrating network comprises a linear capacitor, and wherein the non-linear resistance element of the first integrating network comprises an input resistance of a current mirror circuit.

Claim 16

A receiver as claimed in claim 13, wherein the input resistance of the current mirror circuit comprises a diode, a transistor, means connecting the diode in parallel with the base-emitter junction of the transistor, the collector of the transistor constituting the output of the current mirror.

Claim 17

A receiver as claimed in claim 13, wherein said switched supply source comprises a two-position switching network connected to the output of the current mirror and comprising means for alternately supplying equal and oppositely directed currents to the second integrating network of the receiver.

Claim 18

A receiver as claimed in claim 10, further comprising a linear resistor connected in series with the non-linear resistance element of the first integrating network.

Claim 19

A receiver as claimed in claim 10, further comprising a direct voltage supply source means connected to the non-linear integrating network for providing a minimum dynamic control signal.

Claim 20

A receiver as claimed in claim 11, further comprising a direct voltage supply source, a first transistor, means connecting the collector and emitter electrodes of the first transistor in parallel with the terminals of the capacitor, means connecting the emitter electrode of the first transistor to a first terminal of the direct voltage supply source, two further transistors, means connecting the collector of the first transistor to a second terminal of the direct boltage supply source through the emitter-collector paths of said two further transistors, a resistor, a first diode, a second diode, means connecting the resistor, the first diode and second diode in series across the two terminals of said direct voltage source, the common terminal of the resistor and the first diode being connected to the interconnected base electrodes of said two further transistors, the commoN terminal of said first and second diode being connected to the base electrode of said first transistor.

Claim 21

An arrangement for the transmission of information signals by pulse code modulation from a transmitter to a receiver, comprising a first pulse modulator in the transmitter for providing output pulses, means for transmitting the output pulses from the first pulse modulator to the receiver, a first clock pulse generator in the transmitter connected to an input of the first modulator, a first pulse series analyzer means in the transmitter connected to the output of the first clock pulse generator and to the output of the first pulse modulator for analyzing successively occurring pulse series from the first pulse modulator within fixed time intervals of at least three successive pulses from the first clock pulse generator and for supplying a pulsatory output signal in response to a first pulse modulator output pulse series exceeding a predetermined modulation index within the fixed time intervals, a first integrating network in the transmitter connected to the output of the first pulse series analyzer for supplying a continuously variable dynamic control signal, the first integrating network comprising a first storage element and a first non-linear resistance element connected to the first storage element, the first integrating network having a time constant that decreases with increasing signal level, a first switched supply source connected to the output of the first integrating network, means connecting the first pulse modulator output to the first switched supply source for switching the output of the first integrating network in the rhythm of the pulsatory output from the first pulse series analyzer, the dynamic control signal being derived from the first non-linear resistance element of the first integrating network, a second integrating network in the transmitter connected to the output of the first switched supply source, a difference producer having a first input connected to the output of the second integrating network and having a second input for receiving the information signals to be transmitted, the output of the first difference producer being connected to the first pulse modulator, a second clock pulse generator in the receiver corresponding to the first clock pulse generator in the transmitter, a second pulse modulator in the receiver corresponding to the first pulse modulator in the transmitter, a second pulse series analyzer in the receiver corresponding to the first pulse series analyzer in the transmitter, a third integrating network in the receiver corresponding to the first integrating network in the transmitter, a second switched supply source in the receiver corresponding to the first switched supply source in the transmitter, the second clock pulse generator, second pulse modulator, second pulse series analyzer, third integrating network and second switched supply source in the receiver being structurally interconnected and functionally interrelated in the same manner as those corresponding elements of the transmitter, a fourth integrating network in the receiver connected to the output of the second switched supply source for providing an information output signal of the receiver, and means for connecting the output pulses transmitted from the first pulse modulator to the second pulse modulator.

Claim 22

An arrangement for the transmission of information signals by pulse code modulation from a transmitter to a receiver, comprising a first pulse modulator in the transmitter for providing output pulses, means for transmitting the output pulses from the first pulse modulator to the receiver, a first clock pulse generator in the transmitter connected to an input of the first modulator, a first pulse series analyzer means in the transmitter connected to the output of the first clock pulse generator and to the output of the first pulse modulator for analyzing successively occurring pulse series from the first pulse modulator within fixed time intervals of at least three successive pulses from the first clock pulse generator and for supplying a pulsatory output signal in response to a first pulse modulator output pulse series exceeding a predetermined modulation index within the fixed time intervals, a first integrating network in the transmitter connected to the output of the first pulse series analyzer for supplying a continuously variable dynamic control signal, the first integrating network comprising a first storage element and a first non-linear resistance element connected to the first storage element, the first integrating network having a time constant that decreases with increasing signal level, a first switched supply source connected to the output of the first integrating network, means connecting the first pulse modulator output to the first switched supply source for switching the output of the first integrating network in the rhythm of the pulsatory output from the first pulse series analyzer, the dynamic control signal being derived from the first non-linear resistance element of the first integrating network, a second integrating network in the transmitter connected to the output of the first switched supply source, a difference producer having a first input connected to the output of the second integrating network and having a second input for receiving the information signals to be transmitted, the output of the first difference producer being connected to the first pulse modulator, a second clock pulse generator in the receiver corresponding to the first clock pulse generator in the transmitter, a second pulse modulator in the receiver corresponding to the first pulse modulator in the transmitter, a second pulse series analyzer in the receiver corresponding to the first pulse series analyzer in the transmitter, a third integrating network in the receiver corresponding to the first integrating network in the transmitter, a second switched supply source in the receiver corresponding to the first switched supply source in the transmitter, the second clock pulse generator, second pulse modulator, second pulse series analyzer, third integrating network and second switched supply source in the receiver being structurally interconnected and functionally interrelated in the same manner as those corresponding elements of the transmitter, a fourth integrating network in the receiver connected to the output of the second switched supply source for providing an information output signal of the receiver, and means for connecting the output pulses transmitted from the first pulse modulator to the second pulse modulator.