SU588614A1 - Device for shaping multiple modulation signals - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF SIGNALS OF MULTIPLE MODULATION

multi-tap digital delay line 1, to each tap of which serially connected phase modulator 2 and attenuator 3 are connected, while the outputs of attenuators 3 are connected to the input of adder 4, the output of which is an output of the device, other inputs of phase modulators 2 are connected to the output of source 5 carrier oscillations, and the control input, the multiple-input digital delay line 1 and the control inputs of the attenuators 3 are connected to the corresponding outputs of the source 6 clock oscillations, as well as series-connected additional The telny phase modulator 7 and additional attenuator 8 connected between each tap of the multi-drop digital delay line 1 and the input of the adder 4, while the inputs of the additional phase modulators 7 are connected to the additional output of the source of carrier oscillations, the input of each of the additional attenuators 8 is connected to another input corresponding to the main attenuator 3 and with the output of one of the entered by the number of taps multi-tap digital delay line 1 amplitude modulators 9, the first input of each of which is connected the corresponding tap of the introduced additional multi-tap digital delay line 10, the second input with the output of the additionally introduced function generator 11, the control input of which is connected to the clock source clock output, and the control input of each of the amplitude modulators 9 is connected to the control inputs of the respective main and an additional attenuator 3 and 8, while the control input of the additional multi-tap digital delay line 10 is connected to the control input of the main multi-tap digital delay line 1, and its information input is the second input of the device.

The device works as follows.

The binary signals received from the transmitted information sequence by preliminary transcoding are fed synchronously to the inputs of the main and additional multi-drop digital delay lines 1 and 10 and advanced along these lines due to the advancing pulses from the clock source. From the taps of the main multi-branch digital line of the Dedersky 1, the signals are fed to the main and additional phase modulators 2 and 7, the output of which receives segments of carrier oscillations corresponding to the input signals of a unit interval T, and the carrier oscillations at the outputs of the main and additional phase modulators 2 and 7, connected to a single tap of the main multi-drop digital delay line 1, always have a phase difference of 90 °. From the output of the main and additional phase modules of mountains 2 and 7, these signals are sent to

the primary and secondary attenuators 3 and 8, in each of which the corresponding segments of the carrier waves are given the shape of the corresponding segment of the envelope and need amplitude.

To obtain amplitude modulation, signals are pre-passed through amplitude modulators 9. The transmission coefficient of amplitude modulators 9 is determined by signals that are advanced in an additional multi-drop digital delay line 10 synchronously with the advance of signals on the main multi-drop digital line

delays 1. From the output of the main and additional attenuators 3 and 8, the signals arrive at the input of the adder 4, forming a linear signal.

Claims (1)

Invention Formula A device for generating multiple modulation signals containing a multi-tap digital delay line at the input, to each tap of which serially connected phase modulator and attenuator are connected, while the attenuator outputs are connected to the input of the adder, the output of which is the device output, other inputs of phase modulators connected to the output of the source of carrier oscillations, and the control input of the multi-tap digital line 1 and the control inputs of the attenuators are connected to the corresponding outputs of the source ika clock oscillations, characterized in that, in order umenscheni frequency output distortion when operating in mode amplitude, phase, frequency, and also at any combination of these types of modulation, an additional phase modulator and an additional attenuator are connected in series between each tap of a multi-tap digital delay line and the input of the adder, while the other inputs of the Additional phase modulators are connected to the additional output of the source of oscillation, the other input of each of the additional attenuators connected to another input of the corresponding main attenuator and to the output of one of the multi-tap digital lines introduced by the number of taps the delays of the amplitude modulators, the first input of each of which is connected to the corresponding tap of the introduced additional multi-drop digital delay line, the second input — with the output of the additionally introduced function generator, the control input of which is connected to the clock source of the clock oscillations, and the control input of each amplitude modulators are connected to the control inputs of the respective main and additional attenuators, while the control input is an additional one the digital delay line is connected to the control input of the main multi-tap digital delay line, and its information input is the second input of the device. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 527829, cl. H 04L 5/06, 1974.