SU634470A1 - Multiple-modulation signal shping arrangement - Google Patents

Description

The invention relates to telecommunications and can be used in discrete information transmission systems.

A multi-modulation signal shaping device is known, comprising a digital multi-tap delay line, the control input of which is connected to the first output of the clock oscillator, and the taps are connected via phase modulators to one of the attenuator inputs, the other inputs of which are connected to the second output of the clock oscillator, and the outputs of the attenuators are combined and connected to the input of the adder, and the other inputs of the phase modulators are connected to the output of the source of carrier oscillations 1.

However, in such a device, the formation accuracy is insufficient.

The purpose of the invention is to increase the accuracy of the formation.

To do this, a multi-modulation signal shaping device containing a digital multi-tap delay line, the control input of which is connected to the first output of the clock oscillator unit, and the taps are connected to one of the attenuator inputs through other phase inputs of the second attenuator. clock oscillations, and the attenuator outputs are combined and connected to the input of the adder, while the other inputs of the phase modulators are connected to the output of the source of carrier oscillations, are introduced in series e the first and second dividers into two and the modulo two, the generator, the additional digital multi-drop delay line, the amplitude modulators, and the other input of the modulo two is the device input, and its output and output of the first divider are two combined and connected to the input of the first digital multi-split delay line, the first input of the additional digital multi-split delay line is connected to the first output of the clock oscillation block, the second input is the second input of the device, and the taps through the amplitude mode tori are connected to additional inputs of attenuators, the third output clock oscillation unit through the generator is connected to the other inputs amilitudnyh modulators, and

iie) output of the block of clock oscillations connect} with the input of the first divider by two

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

It contains a digital multiturn delay line 1, a block of 2 clock oscillations, phase modulators 3, attenuators 4, a sous.mattor 5, a source of 6 carrier oscillations, dividers by two 7 and 8, an adder 9 but a module two, a generator 10, an additional digital multi-tap delay line 11, amplitude modulators 12.

The device works as follows

The binary signal corresponding to the variable sign (bi) is fed to the input of the adder 9 modulo two and from its output along with the signal from the divider to two 7 is fed to an additional digital multi-drop delay line 11. At the same time the digital corresponding multi-drop line 1 enters the input corresponding to the variable (bi). The rate of advancement of these signals in the delay lines is equal to the transmission rate of the signal elements B and is equal to 1 / T, where T is the unit interval. From the taps of an additional digital multi-branch delay line 11, the signals fall on phase modulators 3, at the output of which receive sections of carrier oscillations with the phase in / 2-pd (bi). 7, 8 due to the clock oscillations from them from the block 2 clock oscillations. The shift by the value of l5 (bi) is due to the modulo two operation of the adder 9. From the output of the phase modulators 3, the carrier oscillations fall on the attenuators 4, in each of which the corresponding segments of the carrier oscillations are attached to the shape of the corresponding envelope and the amplitude is needed. The required amplitude is obtained by supplying the basic signals from the generator 10 to the attenuators 4 through amplitude modulators 12. The specified value of the envelope shape in each attenuator 4 is obtained by passing the feed signals. e. we have a clock oscillation from block 2 clock oscillations. Approximation of the envelope by segments of given functions is achieved in attenuator 4 by using the specified schemes AND signals from generator 10 as the supply voltage. From the attenuator 4 output, the signal sections are fed to the input of adder 5, the output of which produces a linear signal.

Claims (1)

1. USSR author's certificate 527829, MKI H 04 L 5/06, 1974.