SU681568A1 - Bipulse phase-manipulated signal reference frequency former - Google Patents

Description

(54) FORMER OF SUPPORT FREQUENCY OF BIMPULSE PHASOMANIPUPED SIGNAL

The invention relates to communication technology and can be used in apparatus for receiving and processing a bi-pulse phase-manipulated signal.

A device for generating a reference frequency from a sequence of bi-pulse 1J pulses is known. A disadvantage of such a device is the formation of a reference frequency from a signal with a fixed modulation rate.

A reference frequency driver is also known, comprising a subtraction element, a delay line, a full-wave rectifier, a narrow-band filter, and a time selection circuit 2.

In this device, an irregular pulse train formed by the delay line of the subtraction element and a full-wave rectifier is compared with the first harmonic of the sinusoidal signal extracted by the narrow-band filter from this sequence, thus forming a sequence of reference frequency pulses.

Such a device, due to the presence of a narrowband filter, also selects the reference frequency from a signal with a fixed modulation rate.

The aim of the invention is to expand the frequency range of the device.

This is achieved by addition of a subtraction element, delay line, rectifier, OR element and a waiting multivibrator to the frequency generator of the bi-pulse phase-manipulated signal, and the rectifier outputs are connected to the first inputs of the subtraction elements, and the outputs of the subtraction elements are connected through the OR element with the input of the standby multi-vibrator, while the rectifier inputs are combined, and the input and output of the additional delay line are connected to the first and second inputs of the additional element

5 subtract accordingly.

FIG. 1 shows a functional diagram of the device; in fig. 2 timing diagrams explaining Q's work.

The device contains rectifiers. 1 and 2, which are designed as half-wave, delay lines 3 and 4, subtraction elements 5 and 6, the element OR 7, and the waiting multivibrator. 8. Fig. 1 also shows input 9 and output 10 tires.

The device works as follows.

The inputs of half-wave rectifiers 1 and 2 are supplied with a bi-pulse phase-manipulated signal (see Fig. 2a), in which the first positive or negative significant positions of the bi-pulses are transmitted at a zero level as the phase changes. Irregular pulse sequences (see Fig. 26, c) are formed at the rectifier outputs, which are fed to the inputs of subtraction elements 5 and 6 directly and through the lines 3 and 4 (see Fig. 2 g, d). At the outputs of the elements of the subtraction, sequences of narrow pulses are formed (see Fig. 2 e g), which, after adding on the element OR 7 (Fig. 2 h) and normalizing with the waiting multivibrator 8, form the reference frequency (see Fig. 2i). The duration of the pulses at the outputs the elements of the subtraction are determined by the delay time of the signals on the delay lines and are selected sufficient for the normal operation of the OR element. Possible bifurcation of the pulses at the output of the OR element when adding the narrow pulses formed by the elements of the subtraction along the adjacent edges of the biv signals is eliminated by an appropriate choice of the pulses of the waiting multivibrator.

Thus, this device provides the formation of a reference frequency in a wide range of the frequency of the bi-pulse phase-shift keyed signal and, moreover, allows for two-stroke signal processing, since the reference pulses are extracted at each position of the bi-pulse.

Claims (2)

1. USSR Author's Certificate No. 409396, cl. And 04 L 7/00, 1972. 2. The author's certificate of the USSR 457183, cl. And 04 L ./02, 1975. / U j4kjh n nri n rn rn G-1 -I n I-I r 1I-I n n n n n n n n n n n n n t nnnnnnnnnn.nn m n m n pi uz.S