SU1021013A1 - Frequency-phase-modulated signal shaper - Google Patents

Abstract

A FORMER OF SIGNALS WITH FREQUENCY-PHASE MANIPULATION containing series-connected first switch, the first and second inputs of which are connected to the outputs of the first and second reference oscillator, and a frequency divider, as well as a low-pass filter, and the control input of the first switch is the first input information signal shapers of signals with frequency-phase manipulation, characterized in that, in order to reduce the parasitic components in the spectrum of output signals while o increase the number of gradations of phase jump, between the output of the first switch and the input of the low-pass filter entered in series the first counter, second switch, second counter, third switch, permanent memory-device and digital-a) tax converter, between the output of the frequency divider and the second a trigger is input to the second switch; a block of code comparison between the outputs of the second counter and the second inputs of the third switch is entered between the output of the first counter and the second input of the trigger the adder, the second inputs of the code matching unit and the second inputs of the binary adder are connected respectively to the lower-order outputs and the higher-order outputs of the entered code sensor, while the installation input of the frequency divider is connected to the output of the code comparison unit, the output of the second switch is connected to the sync input digital-to-analogue trans: tel, and the axoyivii controls of the second and third switches are interconnected, and their point is -. with the second input of the information signal fsch worldviewer signal with frequency-phase manipulation. ABOUT

Description

The invention relates to radio engineering and can be used in radio communications, radiolocation, radio navigation and radio control to obtain signals with phase and frequency modulation.

A signal shaper with frequency-phase manipulation is known, containing a serially connected py switch, the first and second inputs of which are connected to the outputs of the first and second reference oscillator, respectively, and a frequency divider, as well as a low-pass control input the switch is the first input of the information signal of the signal conditioner with frequency-phase shift O).

 However, in the | output signal of a known signal former with frequency-phase manipulation, there is a relatively high level of parasitic components, in order to reduce which the use of a filter with a high slope is required, since the parasitic spectral components are close to useful, with this in the filter in turn, dynamic distortions appear.

In addition, in a well-known signal conditioner with frequency-phase shift keying, it is impossible to obtain a signal with phase shift keying other than 180.

The purpose of the invention is to reduce the parasitic components in the spectrum of the output signals while simultaneously increasing the number of gradations of the phase jump.

This goal is achieved by the fact that a frequency-shift keying shaper containing the first switch connected in series, the first and second inputs of which are connected to the outputs of the first and second reference oscillator, respectively, and the frequency divider, and The first input of the first switch is the first input of the information signal of the signal shaper with frequency-phase keying, and there are entered between the output of the first switch and the input of the low-pass filter. therefore connected the first counter, a second switch, the second estimator, a third switch, a read only memory

and a digital-to-analog converter, a trigger is inserted between the output of the frequency divider and the second input of the second switch, a code comparison block is inserted between the output of the first counter and the second trigger input, and an adder is entered between the second counter outputs and the second inputs of the third switch, the second inputs of the code comparison block and the second the inputs of the binary adder are connected respectively with the outputs of the lower bits and the outputs of the higher bits of the entered sensor codes, while the installation

5 input divider: -frequency is connected to the output of the code comparison block, output. the second switch is connected to the synchronization input of the D / A converter, and the control inputs

0 of the second and third switches are interconnected, and their connection point is the second input of the information signal shaper with frequency-phase shift keying.

Fig. 1 shows the structural electrical circuit of the proposed signal generator with frequency-phase manipulation; figure 2 - timing charts of his work.

0

The former contains the first and second reference generators 1 and 2, the first switch 3, the frequency divider t, the first counter 5, the code comparison block 6, the trigger 7, the second switch

5 8, second counter 9, third switch 10, read-only memory (ROM) 11, digital-to-analog converter (DAC) 12, low-pass filter 13 (LPF), binary

About adder N, sensor 15 codes.

The signal conditioner with frequency phase shift manipulation operates as follows.

The output signals of the reference generators 1 and 2, which are pulse sequences with a pulse repetition rate of f-.H f (respectively, Figures 2a and b), are fed to the input of the first switch 3,

 which, depending on the information signal of the frequency manipulation at its control input, passes either a sequence of pulses from the reference oscillator 1 — with an information signal equal to logical O (FIG. 2b), or from the reference oscillator 2 — with a logical 1. Output voltage of the first the switch 3 is fed to the input of the n-bit of the first counter 5 and the frequency divider k by. The output of the first counter 5, which is the current value of the binary code, is fed to the first input of block 6 of code comparison, to another input of which a jump code is sent from the lower bits of the sensor 15 codes. The latter can be, for example, a set of toggle switches with which a logical zero or one voltage can be set at the corresponding bits. The output of block 6 of code comparison (Fig. 2d), which is a sequence of pulses with a following frequency or f2 / 2 depending on the value of the information signal of frequency shift keying (FM) and appearing when the codes at its inputs coincide, is fed to the second input trigger 7 and writes (sets) to it a unit, and also sets the divider k to the initial state. The divider k is often a device that transmits a pulse arriving at its input. The output signal separator k frequency (figd) arrives at the first input of the trigger 7 and writes (sets) to it zero. The signal from the output of the trigger 7 (Fig. 2e), which represents the voltage of the meander type, is fed to the input of the second switch 8, to another input of which a signal comes from the output of the higher bit of the first counter 5 (Fig. 2g), also representing The meanings of the meanings The following frequencies of the two signals at the inputs of the second switch 8 are equal to f2 / 2, but the value of -YYy A: t (2) / 2 is shifted, where T (2) (2) is | 2 a j - the state of the lower radars sensor 15 codes. The second switch 8 transmits, depending on the information signal of phase shift keying (FM) (FIG. 2, applied to its control input, or sequential; pulses from the high-order output of the first counter 5, when the FM information signal is equal to logical O , or from the output of the trigger 7 - at logical 1 (Fig. 2i). The pulse sequence from the output of the second switch 8 is fed to the input to the discharge of the second counter 9, which is triggered by the voltage drop from the logical zero to a logical unit and converts the flow impulses cos ny in binary code, the repetition period of which is equal, W) where k - number of MSB encoder 15 codes rows. The sequence of codes from the output of the second counter 9 is fed to the input of the third switch 10, the other input of which receives the code from the output of the binary adder k. This code is equal to the sum of the codes from the output of the second counter 9 and the most significant bits of the sensor codes 15, applied to the corresponding inputs of the binary adder Ik. The code from the output of the third switch 10, equal depending on the information signal FM, supplied by the control input of the third switch 10, or the code at the output of the second counter 9 (information signal FN is equal to zero), or at the output of the binary adder (information signal The FM is equal to the logical unit) is applied to the address input of the post-storage device 11, the truth table of which is composed in such a way that the sequence of address code combinations selects the output sequence greater than ASP of clarity, the values of which are proportional to values of the instantaneous amplitude of a harmonic signal at its period. The code combination from the output of the ROM 11 is also recorded using a synchronization pulse on switching from a logical unit to a logical zero supplied from the output of the second switch 8 to the DAC 12, where it is converted to an analog voltage proportional to the value of the binary code on the DAC 12. During operation the second counter 9 and the DAC 12 on different edges of the pulse eliminates failures due to signal delays in the second counter 9, the third switch 10, the ROM 11, the binary adder 14 and transients in them. The output signal of the D / A converter 12 is fed to the input of the low-pass filter 13, which filters the spurious components in the signal spectrum lying in the frequency range). The output signal of the low-pass filter 13 is a frequency-shift jitter with a frequency equal to.

-t (2/2 ..tc

the number of possible phase jumps 2 and the phase jump setup discrete. s

The proposed signal shaper with frequency-phase manipulation allows to obtain FM-FM oscillations with high spectral purity (since the parasitic components lie 2 times higher than the fundamental frequency and are easily filtered) and a large number of gradations of the phase jump, which, in turn, when used, for example, in systems for transmitting discrete information, it leads to an increase in noise immunity of these systems. miiininiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiniiiiiiiiL

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Claims (1)

FREQUENCY-PHASE MANIPULATION FORMERS, comprising a first switch connected in series, the first and second inputs of which are connected to the outputs of the first and second reference oscillators, and a frequency divider, as well as a low-pass filter, while the control input of the first switch is the first input of the shaper information signal signals with frequency-phase shift keying, with the fact that, in order to reduce spurious components in the spectrum of output signals while the number of gradations of the phase jump, between the output of the first switch and the input of the low-pass filter, serially connected first counter, second switch, second counter, third switch, read-only memory and digital-to-analog converter are introduced, a trigger is introduced between the output of the frequency divider and the second input of the second switch , between the output of the first counter and the second input, a code comparison unit is inserted; between the outputs of the Second counter and the second inputs of the third switch, an adder is entered, the second the first inputs of the sneaker comparison unit and the second inputs of the binary adder are connected respectively to the outputs of the lower bits and the outputs of the higher ® bits of the entered code sensor, while the installation input of the frequency divider is connected to the output of the code comparison unit, the output of the second switch is connected to the synchronization input of the digital-to-analog converter , the control inputs of the second and third switches are interconnected, and the point of their connection is the second input of the information signal of the signal conditioner from the frequency a marketing manipulation. 10210'1 3