SU1113897A1 - Frequency-shift keyer - Google Patents

Abstract

1. A FREQUENCY MANIPULATOR containing a synchronizer, a first phase shifter, first and second master oscillators, the outputs of which are connected respectively to the signal inputs of the first and second keys, the outputs of which are interconnected, and to the first and second inputs of the mixer, different from. Thu, oh, in order to reduce the output signal bandwidth, the third and fourth keys are entered into it, the signal inputs of which, respectively, are connected to the outputs of the first and second master oscillators, the first, second, third and fourth elements, respectively, through the first and second phasers The outputs of which are connected to the control inputs of the first, second, third and fourth keys, respectively, the phase control unit, the forward and inverse outputs of which are connected to the first inputs of the corresponding. The first and second elements And the third and fourth elements And, the frequency doubler, the input of which, together with the input of the phase control unit, is connected to the output of the mixer, and the output is connected to the pulse input of the synchronizer, the direct and inverse outputs of which are connected to the second inputs of the first and The third And elements and the second and Four And elements, the first and second control inputs of the phase control block are connected respectively to the forward and inverse outputs of the synchronizer, and the outputs of the third and Werth keys are interconnected and connected to the interconnected outputs of the first and second keys. 2. The manipulator according to claim 1, wherein the phase control unit contains an additional phase shifter connected through the amplifier-limiter to the first input of the additional element AND, the element OR, the first and second differential inputs of which are control the inputs of the control unit are with the phase, and the output is connected to the second input of the specified additional element I, the output of which is connected to the counting input of the trigger, the outputs of which are 1 m and the inverse outputs of the phase control unit, the signal input which is the input of an additional phase shifter.

Description

The invention relates to communication technology and can be used in devices for generating frequency-manipulated FM siglov with orthogonal symbols and bursts in phase. A device for generating an FM signal with the same LJl symbol duration is known. A disadvantage of such a device is the phase gap formed signal. Closest to the proposed frequency manipulator, which contains the first and second master oscillators, the outputs of which are connected to the signal inputs of the first and second key elements and to the inputs of the frequency mixer. The output of the frequency mixer through the first phase shifter is connected to the control input of the synchronizer, the outputs of which are connected to the control inputs of these key elements, with the outputs of the latter connected to each other C21. A disadvantage of the known frequency manipulator is that the FM signal formed by it occupies a more irregular frequency band than is necessary for transmitting the FM signal with orthogonal symbols without phase discontinuity with the frequent manipulation index, 5. The aim of the invention is to reduce the bandwidth of the output signal. The goal is achieved by the fact that in a frequency manipulator containing a synchronizer, the first phase shifter, the first and second master oscillators, the outputs of which are connected respectively to the signal inputs of the first and second key, the outputs of which are connected between the composite and the first and second inputs of the mixture bodies, the third and fourth keys are introduced, the signal inputs of which, respectively, through the first and input second phase shifters are connected to the outputs of the first second master oscillators, respectively, the first, second, third and fourth el And elements, whose outputs are connected to control inputs of the first, second, third and fourth keys, respectively, the phase control block, the direct and inverse outputs of which are connected to the first inputs of the first and second And elements, and the third and fourth And elements, the frequency doubler, the input of which, together with the input of the phase control unit, is connected to the output of the mixer, and the output is connected to the pulse input of the synchronizer, the direct and inverse output, which are connected to the second inputs of the first and third, respectively And elements and the second and fourth elements And, the first and second control inputs of the phase control unit are connected respectively to the forward and inverse outputs of the synchronizer, and the outputs of the third and fourth keys are interconnected and connected to interconnected outputs of the first and second keys In addition, the phase control unit contains an additional phase shifter connected through an amplifier-distributor to the first input of the additional element AND, the element OR, the first and second differentiating inputs of which O are the control inputs of the phase control unit, and the output is connected to the second input of the specified additional element AND, the output of which is connected to the counting input of the trigger, the outputs of which are the forward and inverse outputs of the phase control unit whose signal input is the input of the additional phase shifter . FIG. I shows the functional diagram of the frequency manipulator; in fig. 2 --- time diagrams for his work. The frequency manipulator contains the first and second master oscillators 1 and 2, the outputs of which are connected respectively to the signal inputs of the first and second keys 3 and 4, as well as through the first and second phase shifters 5 and 6 -. with signal inputs of the third and fourth keys 7 and 8; a mixer 9, the inputs of which are connected to the outputs of the first and second master oscillators and 2, and the output is connected to the signal input of the phase control unit 10, as well as through a 1 G frequency doubler to the pulse input of the synchronizer 12; the first, second, third and fourth elements And 13 - 16. For my output of the synchronizer 12 is connected to the second inputs of the first and third elements And 13 and 15,

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as well as with the first control input of the phase control unit 10. The inverse output of the synchronizer 12 is connected to the second inputs of the second and fourth elements And 14 and 16, as well as to the second control input of the I-phase control unit. The first inputs of the first and second elements And 13 and 14 are connected to the direct output of the phase control unit 10, and the first inputs of the third and fourth elements And 15 and 16 with its inverse output. The outputs of the first, second, third and fourth elements I 13-16 are connected to the control inputs of the first, second, third and fourth keys 3,4,7 and 8, respectively. The input of the synchronizer 12 is the input 17 of the frequency manipulator, and the connected outputs all four keys 3,4,7 and 8 - his exit 18.

The phase control unit IO includes an additional phase shifter 19 connected through an amplifier — it will limit € 20 to the first input of an additional element I 21; the second input of the additional element AND 21 is connected to the output of the element OR 22, the differentiating inputs of which are the first and second control inputs of the phase control unit 10; the output of the additional element I 21 is connected to the counting input of the trigger 23, the direct and inverse outputs of which serve as the output of the phase control unit 10.

The manipulator works as follows.

The oscillations of the original frequencies and f (Fig. 2a and 2b) from the outputs of master oscillators 1 and 2 are fed to the signal inputs of the first and second keys 3 and 4, to the first and second inputs of the mixer 9, and also through the first and second phase shifters 5 and 6 - The signal inputs of the third and fourth switches 7 and 8 (, Figs. 2b and 2p. From the output of the mixer 9 are differential frequency oscillations, -, (Fig. 2a are fed to the inputs of the phase control unit 10 and the frequency doubler II).

Doubler II frequencies generate pulses at times that coincide with the phase of the difference oscillation f, equal to o or 180 (Figure 2e), which corresponds to the phase shift between the original oscillations of frequencies f, and (, equal to o or 180

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(Fig. 2a and 2b) i The generated pulse train with the following frequency equal to 2 is fed to the pulse input of the synchronizer 5 12. - -

The input binary signal (Fig. 2 is fed to the input 17 of the synchronizer 12, the output of which forms two mutually inverse binary signal sequences with a symbol duration equal to .2h and 2wV. The boundaries of the generated symbols coincide with the pulses from the frequency doubler 11,

5 i.e. with the moments when the phase difference of the initial oscillations of the frequencies 4 and fo is equal to O or 8 (f.

The binary signal from the direct output of the synchronizer 12 (Fig. 2h) enters

0 to the second inputs of the first and third elements And 13 and 15, and the signal from its inverse output (.fig. 2c) - to the second inputs of the second and fourth elements And 14 and 16. In this case, when the unit is transferred (Fig. 2h) permitting potential is present at the second inputs of the first and third elements And 13 and 15, and. when transmitting zero (fig. 2i) - at the inputs of the second and fourth elements And 14 and 16. Thus, when transferring the unit to the output 18 of the proposed frequency manipulator, one of the two frequency oscillations f arrives. from the output of the first or third key 3 or 7 (fig.2r, when transmitting zero one of two oscillations of the frequency f from the output of the second or fourth key 4 or 8 (fig. 26, 2d Phase of each of the original oscillations (fig.2o or 2b) coincides with the phase of another initial oscillation (Fig. 2b or 2cx) at the even moments of possible switching, when the phase of oscillation of the difference frequency ft g. 2a} is O, ac the phase of another inverted oscillation (Fig. If or 2cH) at odd moments of possible switching, when the phase of oscillation of the difference frequency d is 180.

 The permissive signals, with the help of which the elements of And are switching oscillations with frequencies d and -S without interrupting the phase, are formed by the control unit

55 phase as follows.

Binary signals (Fig. 2, 3 and 4) from the direct and inverse outputs of the synchronizer 12 are sent to the differentiating inputs of the SHSh 22 element. At the moments of changing the states of the output signals of the synchronizer, the pulse of the output element OR 22 is generated and fed to the second input of the additional element 21 ig. 2k To the first input of the additional element I 21, as a permitting signal from the mixer 9, through the additional phase shifter 19 and the amplifier-limiter 20, the phase-shifted fig is supplied. 2.l limited oscillation of the difference frequency f ((Fig. 2mH) At the output of element And 21, pulses can appear only at those moments when the phase of oscillation of the difference frequency (fig. 2l) is 180 (figure 2 "These pulses arrive at the counting input of the trigger 23, at the outputs of which two mutually inverse video signals are formed (Fig. 2o, 2p), one of which is fed to the first inputs of the first and second elements I 13 and 14, and the other to the first inputs of the third and fourth elements And 15 and 16. the outputs of the first, third, second, and fourth elements And 13 - 16 formed pack Aux signals (Figs. 2p, 2c, 2t and 2v), which enter control inputs, respectively. The first, third, second and fourth keys 3, 7.4 and 8 and allow one of the four oscillations to pass to the output 18 (.fig. 20, 2b or 2g) with the desired frequency and phase. As a result, output 18 receives an FM signal without a phase break with the same symbol duration equal to T and P -P frequency spacing of Fig. 2cp.) the torus allows you to generate a FM signal with orthogonal symbols without phase discontinuity and the minimum possible The frequency manipulation dex is E 0.5, which reduces the bandwidth of the output signal.

Phie. one

Claims (2)

1. A FREQUENCY MANIPULATOR comprising a synchronizer, a first phase shifter, first and second master oscillators, the outputs of which are connected respectively to the signal inputs of the first and second keys, the outputs of which are interconnected, and to the first and second inputs of the mixer, characterized in that. so, in order to reduce the frequency bandwidth of the output signal, the third and fourth keys are inserted into it, the signal inputs of which are connected through the first and second phase shifters respectively to the outputs of the first and second master generators, respectively, the first, second, third and fourth elements the outputs of which are connected to the control inputs of the first, second, third and fourth keys, respectively, a phase control unit, the direct and inverse outputs of which are connected to the first inputs, respectively, of the first and second elements of I and the third and fourth elements of I, a frequency doubler, the input of which, together with the input of the phase control unit, is connected to the output of the mixer, and the output is connected to the pulse input of the synchronizer, the direct and inverse outputs of which are connected to the second inputs of the first and third elements of AND, respectively and the second and fourth elements And, the first and second control inputs of the phase control unit are connected respectively to direct and inverse outputs of the synchronizer, and the outputs of the third and fourth keys are connected between at home and connected to interconnected outputs of the first and second keys. 2. The manipulator according to claim ^, characterized in that the phase control unit comprises an additional phase shifter connected via an amplifier-limiter to the first input of the additional element AND, an OR element, the first and second differentiating inputs of which are control inputs of the phase control unit, and the output is connected to the second input of the specified additional element And, the output of which is connected to the counting input of the trigger, the outputs of which are direct and inverse outputs of the phase control unit, whose signal input is Xia additional input of the phase shifter. I 11 3897