SU1259508A1 - Frequency-shift keyer - Google Patents

Abstract

The invention relates to telecommunications. Reduced power consumption. The manipulator (M) contains a modulator I, a clock frequency generator 2, a frequency divider 3, a phase discriminator 4, an in-phase formation unit 5, a quadrature formation unit 6, a multiplier 7, an auxiliary generator 8, and a phase shifter (PV) 9. Introduction of the PV 9 to 90 allows, at the output of the manipulator, depending on the input binary information, to form a frequency-manipulated signal without a phase interruption with a manipulation index of 0.5. This is achieved by using a smaller number of RF elements, which leads to a decrease in power consumption. I 3.p. f-ly, 2 ill. you ate co o oo (pub

Description

one

Isolation refers to telecommunications and can be used in discrete information transmission systems to form frequency-manipulated signals with a continuous phase.

The purpose of the invention is to reduce power consumption.

FIG. Figure 1 shows the structural electrical circuit of the frequency manipulator; in fig. 2 is a structural electrical circuit of a modulator included in the frequency manipulator.

The frequency manipulator contains a modulator I, a generator of 2 clock frequencies, a divider 3 frequencies, a phase discriminator 4, a block 5 forming a synphane component, a block 6 forming a quadrature component, a multiplier 7 and an auxiliary generator 8, and also contains a phase shifter 9. Modulator I, which is part of the frequency manipulator, contains a reference oscillator 10, a mixer 11, a first low pass filter 12, a limiter 13, a second low pass filter 14, a HE element 15, a third low pass filter 16, the first installation block 17, the first key The second element 18, the second installation unit 19, the second key element 20, the comparison unit 21, the control unit 22, the controlled oscillator 23 and the synchronizer 24.

Frequency manipulator works as follows.

The reference generator 10 (Fig. 2) generates a high-frequency harmonic oscillation with a frequency f supplied to the input of the mixer 1I. The controlled oscillator 23, whose average frequency is fy fp + fg, changes its frequency abruptly, but without a phase discontinuity, ranging from

fr () fvto

g (fvFj. 4

 2 o b 4

under the action of signals from the outputs of the first 18 and second 20 key elements, which coincide with the information to a constant phase shift with the information signals fed to the input of the frequency manipulator, where f, is the frequency of the auxiliary generator 8 and f 2 is the clock 259508

generator frequency then you.

Thus, at the output of the controlled oscillator 23, a frequency-manipulated signal with a frequency F

toto t incoming on .second

the input of the mixer iI of the modulator 1 and the output of the frequency manipulator. The signal from the output of the mixer 11 through the first low-pass filter 12, which serves to suppress high-frequency conversion products, and the limiter

13 enters through the first output of the torus I module to the second inputs of the blocks

5 and 6 forming the in-phase and quadrature components (Fig. I). The average frequency of this signal is f, and the deviation is equal. The signal with frequency fg from the output of the auxiliary generator 8 is fed to the first input of the unit 5 to form the in-phase component and through the phase shifter 9

ABOUT

90 to the first input of the quadrature component forming unit 6. After multiplying the in-phase and quadrature components in the multiplier 7, a signal is generated at a frequency that is manipulated in phase by ± 90 ° of the information sequence.

The output of the phase discriminator 4, which compares the phase of the signals from the output of the multiplier 7 and from the output of the frequency divider 3, separates the error signal, which then goes to the control input of the modulator 1. The error signal from the control input of the modulator 1 goes to the -input the second low pass filter 14 and through the element NOT 15 to the input of the third low pass filter 16. Filters

14 and 16 low frequencies isolate the signal component of the error signal.

and have a bandwidth d f cf

 . Formed at the outputs

filters 14 and 16 low-frequency signals serve to control the frequency of the controlled oscillator 23. In this case, under the action of the output signal from the second low-pass filter 14, the frequency of the controlled oscillator 23 increases by the nominal value f, and under the action of the signal from the third filter 6 lower frequency decreases by Fy / 4.

l

Comparison unit 21 generates a logical I signal if the signal level of the second low-pass filter 14 exceeds the signal level of the third low-pass filter 16. The output signal from the comparator unit 21 is fed to the first input of the control unit 22, the second input of which receives a synchronous signal from the output of the synchronizer 24, which binds the input information signal to the clock frequency of the clock generator 2. If there is a single parcel in the information signal at the output of the comparator unit 21, a logical 1 signal is generated, at which the first key element 18 is removed and the control signal from the output of the second low-pass filter sets the frequency to be controlled by the signal from the first flea 17 of the installation at the time of the clock pulse 23 ff + generator

F + -f-. When the action of the zero parcel

in the information signal, the second key element 20 is opened by the signal from the second installation unit 19 and the control signal from the output of the third low-pass filter 16 sets the frequency of the controlled oscillator

F

F f -. .T 2 S 4

Thus, at the output of the frequency manipulator, depending on the input binary information, a frequency-manipulated signal is formed without a phase break with a manipulation index of 0.5 .. o

Claims (2)

1. A frequency manipulator containing a modulator and a series-connected clock generator, a frequency divider and a phase discriminator, as well as blocks for forming the in-phase and quadrature components, the outputs of which are connected to the multiplier inputs, and an auxiliary generator whose output is connected to the first inputs of the blocks the formation of in-phase and quadrature components, the second inputs of which are connected to the first output of the modulator, whose control input is connected to the 595084 The output of the phase discriminator, the output of the multiplier is connected to the second input of the phase discriminator, and the information input 5 of the modulator is the input of a frequency manipulator, the output of which is the second output of the modulator, characterized in that, in order to reduce the consumption 10, a phase shifter is inserted into it, which is connected between the output of the auxiliary generator and the first input of the quadrature component forming unit, wherein 15 the output of the clock generator is connected to the clock input of the modulator. 2. The manipulator according to claim 1, which is 20 in that it comprises a series-connected reference oscillator, a mixer, a first low pass filter and a limiter, a second low pass filter, 5 series-connected element NOT and a third low-pass filter, series-connected first set-up unit and key element, series-connected second ones 0, an installation unit and a key element, serially connected comparison and control units, a controlled oscillator and a synchronizer, whose inputs are informational and - clock inputs of the modulator, the inputs of the second low-pass filter and the element are NOT combined with the control input of the modulator, the outputs of the control unit are connected to the inputs of the first and second installation units, the synchronizer output is connected to the second input of the control unit, the outputs of the first and second key elements are combined with a controllable input 5 of the generator, the output of which is connected to the second input of the mixer and is the second output of the modulator, while the outputs of the second and third low-pass filters are connected to the inputs d of the comparison unit and information inputs of the first and second key elements, respectively, the second inputs of the first and second installation units are combined with the clock input 5, and the output of the limiter is the first output of the modulator. Compiled by V. Zenkin Editor M. Blanar Tehred I.Popovich Order 5141/59 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, MocoBa, Ж-35, 4/5 Raushsk nab. Production and printing company, Uzhgorod, st. Project, 4 Proofreader S. Cherni