SU786045A1 - Device for shaping frequency-manipulated signal - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF FREQUENCY-MAI PULSE SIGNAL

one

This invention relates to radios. It can also be used in the equipment for transmitting discrete information by frequency-manipulated signals .5

A device for generating a frequency-manipulated signal is known, comprising a reference frequency generator, the output of which is connected to the inputs of the main pulse generators, the outputs of which are connected to the inputs of the first switch and, a difference frequency signal extractor, the output of which is connected to the first input of the first trigger - S pa, the output of which is connected to the additional input of the first switch, and the series-connected frequency divider and band-pass filter, at 3toM to the second input of the first trigger-20 is on control signal t is given

However, the number of signals generated by such a device is limited to two.

The purpose of the invention is to increase the number of generated signals by 25.

The goal is achieved by the fact that the device for generating a frequency-managed signal, comprising a reference clock signal generator i 30

the output of which is connected to the inputs of the main pulse generators, the outputs of which are connected to the inputs of the first switch and the differential frequency signal separation unit, the output of which is connected to the first input of the first trigger, the output of which is connected to the auxiliary input of the first switch, and serially connected frequency divider and band pass filter, while the second input of the first trigger has a control signal, the second and third switches, delay elements, the second trigger and additional generators are introduced s pulse, the inputs and outputs of which are connected respectively with the output signal of the reference oscillator and the inputs of delay elements, whose outputs are connected to inputs of the second switch, an additional input and output Ko. They are connected respectively to the output of the first trigger and one of the inputs of the third switch, to the other inputs of which are connected the output of the first switch and the output of the second trigger, the first input of which is connected to the output of the difference frequency signal extractor, and the output of the third switch is connected to the input of the frequency divider, and A control signal is applied to the second input of the second trigger.

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

A device for forming an hour. The one-manipulated signal contains a generator of 1 signals of the reference frequency, the main generators of 2 and 3 pulses, additional generators of 4 and 5 pulses, a signal output unit of the differential frequency sigis, the first trigger 7, the second trigger 8, the first, second and third switches 911, elements 12 and 13 delays, frequency divider 14 and band-pass filter 15.

The device works as follows.

The generator 1 of the signals of the reference frequency synchronizes the generators of 2-5 pulses, while the pulse repetition frequency at their outputs are equal respectively

.1 / T, z,) / T; () / T; () / T

where ri is an integer, f 4 is the frequency of the generator of 1 signals of the reference frequency, T is the duration of the symbol of the control signals. At the output of the 6-section of the differential frequency signal, a signal is generated with the frequency fj, i / T ffl, which is the triggering signal of the triggers 7 and 8. Thus, the outputs of the triggers 7 and 8 contain control pulses synchronous with the output of the generator 1 of the reference signals frequency, while the moment of change of characters at the outputs of the triggers 7 and 8 can occur only when the leading edges of the pulses from the outputs of the main generators 2 and 3 pulses coincide. The delay elements 12 and 13 delay the output pulses of the additional generators 4 and 5 pulses so that at the moments of coincidence of the leading edges of the pulses from the outputs of the main generators 2 and 3 pulses, the pulses at the outputs of the delay elements 12 and 13 also had front edges. Switches 9-11, controlled by control signals, synchronized using triggers 7 and 8, operate in such a way that at the input of the frequency divider 14 at each time interval (t, t T), where tjj is the time for changing the characters on the outputs of the triggers 7 and 8, there is a series of pulses with a repetition frequency f, f, fo, or, depending on the symbols of the control signals. Thus, at the output of the switch 11, there is a "pulse four-way frequency-manipulated signal with a manipulation index D fAT 1.0 and medium frequency

first harmonic (p + 1.5) ff ,. When the frequency is divided into two by a frequency divider 14, a pulsed frequency-manipulated signal with a D 0.5 index is obtained. Band-pass filter 15 selects the first harmonic of the signal, i.e. At the output of the device, a sinusoidal four-way frequency-manipulated signal is generated with a manipulation index of D 0.5 and a carrier frequency. Switches 9-11 can be combined in the form of a logical element OR4I. Since the moments of changing the symbols of the output signal coincide with the positions of the leading edges of the pulses. at the inputs of switches 9 and 10, the phase of the output signal will be continuous. The use of four pulse generators makes it possible to double the number of possible frequency positions of the output signal. Using a digital method of generating a frequency-manipulated signal allows to obtain a high stability of the output signal parameters (carrier frequency, manipulation index), determined by stability, frequency 1 of the frequency reference signal generator, eliminate signal distortions associated with non-linearity and inaccuracy of the exhibition in analogue

shaper.

Claims (1)

Invention Formula A device for generating a frequency-manipulated signal, comprising a reference frequency generator, the output of which is connected to the inputs of main pulse generators, the outputs of which are connected to the inputs of the first switch and a differential frequency selection signal extractor, the output of which is connected, to the first input of the first trigger whose output is connected with the additional input of the first switch, and the serially connected frequency divider and band-pass filter, while the second input of the first trigger is controlled A second signal, characterized in that, in order to increase the number of generated signals, the second and third switches, delay elements, second trigger and additional pulse generators are introduced, the inputs and outputs of which are connected respectively to the output of the reference frequency signal generator and the inputs of the delay elements, whose outputs connected to the inputs of the second switch, the auxiliary input and. the output of which is connected respectively With the output of the first trigger and one of the inputs of the third switch to the other inputs of which the output of the first switch and the output are connected the second trigger, the first input of which is connected to the output of the differential frequency selection block, the output of the third switch is connected to the input of the frequency divider, and a control signal is fed to the second input of the second trigger. Sources of information taken into account in the examination l.R.de Buda Coherent O.Emodulation of Ffeguency - Shi tKeying With Federation Ratio IEEE Communication Communication, .Vol. Cbm-20 June 1972, p. 434 (prototype).