SU725580A1 - Apparatus for shaping phase-manipulated signals - Google Patents

Description

The invention relates to radio communications and can be used in data transmission devices for generating carrier frequency signals.

A device for generating 5 phase-shifted signals, containing a series-connected clock pulse generator, a counter, a control valve and an output digital-to-analog converter [1]. ' ,10

However, the known device is characterized by a large amount of distortion of the generated signals;

The purpose of the invention is the reduction of distortion of the generated signals. fifteen

For this purpose, the apparatus for generating the phase modulation signal, comprising serially connected ge- '* generator of clock pulses, counter, yn equals _h and outlet valve _tsifroana: 20 lots converter administered serially connected posledovatelnoparallelny kodopreobrazovatel, block data coding and binary adder, the output of which connected to parallel-25 lnlrm "registering" the input "of the counter, the output of which is connected to another input of the binary adder, and ya 'input' ......

serial-parallel. the data converter is supplied with a data signal, and an additional clock signal is applied to the counter-equalizing counter input.

The drawing shows a structural electrical diagram of the proposed device.

The device comprises a clock pulse generator 1, a counter 2, a control valve 3, a digital-to-analog output converter 4, a serial-parallel code converter 5, a data encoding unit 6, and a binary adder 7.

The essence of the proposed device is as follows.

The / pulses received from the generator, depending on the modulation, are divided into ’the corresponding number of channels, at least two, and a sequence of pulses is created in each channel. The temporary position and sell ^ ^ ^^^ of each individually and in relation to each other changes according to the “pre-selected” reference frame, for example, binary or decimal, in step of generator 1.

The duration of the sequences of pulses transmitted in each channel is equal to: Tbvp'p'ёperZht'a '' ^: 1Ges' \ ptsssy frequency.

In successive sequences at those times, when in the previous, there was no pulse sequence, impulses are transmitted, polar

whose bone is mirrored in relation to previous sequences of pulses. Then, the pulses appearing in all channels simultaneously at the beat of the generator 1 are summed with the amplitude estimation signal. After a temporary and abrupt change in the initial moment of pulse sequences, the value determined by the modulating signal changes the phase of the carrier frequency signal and the phase-shift signal is removed from the output of the device.

Pulses from generator 1 are supplied to counter 2, which counts the signals continuously up to 2, where n is the number of channels. The count is repeated cyclically. By controlling the parallel recording inputs of the counter 2, you can change the content of the signal at its output, so that the counting of the pulses of the generator 1 continues, starting with the specified content of the signal. . ' '’

The output of the counter 2 is connected to the input of the control valve 3, from the output of which signals are received without modulation, corresponding to the repeating binary numbers 0–2 ”, 2 ^:! Wholesale e. These signals are input to a digital-to-analog converter 4.

Thus, in the absence of modulation, the pulse sequence is removed from the output of the digital-analog converter, respectively, of the 2 ” ⁺¹ function.

The modulating data signal is fed to a serial-parallel code converter 5, the parallel outputs of which are connected to the inputs of the data encoding unit 6. Here, groups of data are formed one after the other, which then determine the phase change corresponding to the instantaneous state of the carrier frequency. .

From the output of the data encoding unit 6, double signals related to the corresponding phase jump group are fed to the input of the binary adder 7. At the same time, binary signals corresponding to the step carrier signal removed from the output of the digital to analog converter 4 are received at the other input of the binary adder 7. At the moment of modulation, the summed binary signal corresponding to the subsequent phase state of the phase modulated output signal is taken from the output of the binary adder 7. This signal is fed to the parallel recording inputs of counter 2. The signals from the output of counter 2 are removed when 10 dull, a clock signal to its control registration, input.

In a subsequent cycle, this output signal is considered as the initial value, and the count of pulses continues from 15 of this value. At the output of the device appears fizomanipuliruyuschego signal carrier frequency ..

The invention allows to create a stable undistorted signal carrier frequency. '.

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Claims (1)

Claim Device for the formation of phase25 nipulirovannyh. signals, which contains a series-connected clock pulse generator, a counter, a control valve, and an output digital-to-analog converter, characterized in that 30 are introduced into it to reduce distortions of the generated signals. a series-parallel serial converter, a data encoding unit and a binary adder, the output of which is connected to a parallel recording input of the counter, the output of which is connected to another input of the binary adder, and the data signal is supplied to the input sequentially ^: parallel code converter ⁴⁰ , and the counter control input of the counter is given an additional clock signal. The source of information taken into 45 'attention during the examination: . 1, Bukhviner V.E. Discrete circuits in phase radio communication systems. M., "Communication", 1969, p. 110-112.