SU1233296A1 - Device for transmission of frequency-shift keyed signals - Google Patents

Abstract

The invention relates to radio and provides for the reduction of edge distortion. The signal from the reference generator 1 is fed to frequency dividers (QH) 6-9. The signals with QH 6 and 7 through the corresponding elements And 10 Figure 1

Description

and 11, the element OR 2, the filter 3 and the amplifier 4 are output. Ka) vdy impudd with the element OR 2 sets the PM 6 and 7 to its original position. Signals from DC 8 and 9 through the corresponding elements And 12 and 13 and the element OR 5 arrive at the control unit (CU) 14. The other signal of the BU 14 receives the signal to be converted. Signal- T1Y with BU 14 (direct and inverse

1233296

the trigger outputs 19) control the operation of the elements 10-13. When the position of the signal to be converted is changed, when the sync pulse from the RSH element .5 coincides with the potential from the trigger 17, the trigger 19 is switched to another state. At the same time, its control signals provide the appearance at the output of a device of a signal of another frequency, - 1 hp, f-ly, 2 sludge.

This invention relates to a radio communication technique and may be used in information transmission systems.

The purpose of the invention is to reduce edge distortion.

FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 - voltage plots showing the operation of devices.

A device for transmitting frequency-manipulated signals contains a reference oscillator 1, the first element OR 2, a filter 3, an amplifier 4, a second element S1ID 5, the first, second, third and fourth frequency dividers 6-9, the first, second, third and fourth elements And 10-13, control block 14, consisting of AND 15, delay element 16, first three: gg 17, differentiation element 18, second flip-flop 19.

The device works as follows.

From the output of the reference oscillator 1, the signal with frequency fd „is fed to the inputs of the first and second dividers of frequency 6 and 7. From the output of the first and second dividers 6 and 7, the frequencies of the signals go to the first inputs of the first and second elements 10 and 11, respectively, to the second inputs of which, respectively, control signals are fed from the direct and inverse outputs of the second trigger 19 of block 14 management Upon receipt from the direct output of the second trigger 19 of a single potential to the second input of the first element I 10, the signal from the output of the first divider 6 at a frequency f / n through

The first element OR 2 filter 3 and amplifier 4 passes to the output of the device. When entering from the inverse output of the second trigger 19 of a single potential to the second input, the second element AND, the signal from the output of the second delay 7 frequency fj, / m passes through the first element 1-ШИ 2, гЗ) 1-штр 3 and amplifier 4 on the output devices. Ckkdsh pulse from the code of the first element OR 2 sets the first and second dividers 6 and 7 of the frequency to its original position.

At the same time, the signal from the output of the reference generator 1 with the frequency f is fed to the inputs of the third and fourth dividers 8 and 9, the signals from OUTPUT13 of which are fed to the first inputs of the third and fourth elements, And 12 and 13, respectively, to the second inputs of which are fed respectively and inverse outputs of the second trigger. 19 control unit 14. Upon receipt from the direct output of the second flip-flop 19 of a single potential and the second input of the third element I 12, the signal from the output of the third divider 8 with a frequency of 2fg / n is fed through the second element RflH 5 to the second input of the element 15 of the control unit 14.

When the position of the converted signal at the input (Fig. 2a) of the control unit 14 is changed: the following change occurs: an input at the input of the differentiation element 18 of the unit 14, which causes a short positive pulse at its output (Fig. 26 This pulse, entering entrance lane 3

first trigger 17 of block 14 (which is in the zero state), translates it into a single state (Fig. 2c). A single potential from the output of the first trigger 17 goes to the first input of element I 15, to the second input of which impulses come from the output of the second element I.PI 5 (fig. 2d), the frequency of which is twice as large as the operating frequency. If the duration of the sync pulse from the output of the second element OR 5 coincides with the beginning of the action of a single potential from the output of the first trigger 17, then the output of the element 15 appears a pulse that enters the counting input of the second trigger 19 at the time of changing positions. From the inverse of the output of the second trigger 19, a positive potential is applied to all the elements AND 10-13. This potential, applied to the second inputs of the second and fourth elements, And 11 and 13, ensures that

frequency outputs f / m and 2f / t, respectively, the first of which through the first element OR 2, filter 3 and amplifier 4 enters the device output, and the second through the second IL 5 element - to the second input of control unit 14. If the sync pulse from the output of the second element OR 5 appears before the onset of the action of a single potential from the output of the first trigger 17, then the pulse does not appear at the output of the element 15, the state of the second trigger 19 does not change. Only after the arrival of the next pulse of the operating frequency, does the output signal change, i.e. it starts later than the change of positions of the input signal. At the same time to the input of the second trigger 19 receives a pulse from the output element And 15 (Fig. 2D). If the sync pulse from the output of the second element OR 5 comes later than a single potential from the output of the first trigger 17, then the position of the output signal is changed at the moment of the pulse from the output of the second element OR 5, i.e. later than the change of positions of the input signal.

Simultaneously, the pulse from the output of the element And 15 is fed to the input of the element 16 delay (Fig. 2E), the duration

The delay time of which is half the duration of the clock pulse. The delayed pulse from the output of the delay element 16 (Fig. 2g) arrives at the other input of the first trigger 17 and translates it to the zero state (Fig. 2c), thereby preventing the appearance of the And 15 pulses at the output of the next sync pulse.

At the next position change, the signal from the direct output of the second trigger 19 is supplied to the second inputs of the first and third elements 10 and 12, ensuring the appearance at their outputs of the frequencies ff

/ n and 2f ,, / n

the respective devices and the second input of the control unit 14, respectively.

Claims (1)

1. A device for transmitting frequency-manipulated signals, comprising a reference oscillator, the output of which is connected to the first inputs of the first and second frequency dividers, the outputs of which are connected respectively to the first inputs of the first and second elements And, the second inputs and outputs of which are connected respectively to the outputs the control unit, the first input of which is the input of the device, and with the inputs of the first element OR, as well as the third frequency divider, the third and quarter elements AND, the second inputs and outputs of which are connected respectively correspondingly with the outputs of the control unit and the inputs of the second OR element, and a filter and an amplifier connected in series, the output of which is an output of the device, characterized in that, in order to reduce the edge distortions, a fourth frequency divider is inserted into it, and the output of the first OR element is connected to the input of the filter and to the second inputs of the first and second frequency dividers, the output of the reference generator is connected to the first inputs of the third and fourth frequency dividers, the outputs of which are connected respectively to the first input m of the third and fourth elements And, the output of the second SHS element is connected to the second inputs of the third and fourth frequency dividers and the control unit. 2, Device POP.1, characterized in that the control unit contains a delay element and a differentiation element connected in series, the first trigger, to the second input of which the output of the delay element is connected, And element And Editor A. Sabo Compiled by A. Moskevich Tehred O. Gortvay Order 2784/58 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 the second trigger, the outputs of which are the outputs of the control unit, the first and second inputs of which are, respectively, the input of the differentiation element and the second input of the AND element, the output of which is connected to the input of the delay element. FIG 2 Proofreader S. Shekmar