SU982053A1 - Frequency signal receiving device - Google Patents

Description

The invention relates to telemechanics and may find application in systems and devices for the conversion and compression of frequency signals.

Devices for automatic processing of frequency sensor signals are known, including counters, valve elements, triggers, AND, OR elements, key elements 1J.

However, this device is structurally complex and has limited functionality.

The closest to the present invention are devices for converting and compressing frequency signals, comprising a frequency detector, whose input is connected to the device input, the output of the frequency detector is connected through a differentiating element to the input of a threshold element, a one-shot, a key element, an output device 2.

The disadvantage of these devices is that they practically do not provide compression of information.

The purpose of the invention is to increase the possibility of compression.

The goal is achieved by the fact that in the device for receiving frequency signals containing a frequency detector, whose input is connected to the device input, the output of the frequency detector is connected to the input of the threshold element through a differentiating element, key elements, switches, And elements, controlled frequency dividers, the OR element and the control trigger whose outputs are connected to the outputs

10 devices, with the first inputs of the first and second key elements, with the first inputs of the elements And, p. the control inputs of the switches and with the inputs of the element OR, the output of which is connected to the device's sync output, the second inputs of the first two key elements are connected to the input of the device, the output of the threshold element is connected to the inputs of the switches, the outputs of which are connected to the second inputs of the corresponding elements AND, outputs which are connected respectively to the first inputs of the third and fourth key elements, the second inputs of which are connected to the first inputs of the corresponding controlled frequency dividers and connect us to the outputs of the first and second core elements sootvetst30 venno, the outputs of the third and fourth

the key elements are connected to the second inputs of the respective controlled frequency dividers, the outputs of which are connected to the inputs of the control trigger.

FIG. 1 shows a block diagram of the device) “and FIG. 2 - time diagrams.

The device contains a frequency detector 1, differentiating element 2, threshold element 3, key elements 4 and 5, switches B controllable dividers 8 and 9 frequencies, key elements H and 11, elements 12 and 13, control trigger 14, the element OR 15, the crystal oscillator 16, the element of the tape L 17 and 18, the counters 19 and 20 pulses.

Position 21 corresponds to the input signal, position 22 - 39 - to the signals removed from the indicated elements (in Fig. 1).

The device works as follows.

The measured frequency is supplied simultaneously to the key elements 4 and 5 and to the frequency detector 1. In the initial state, one of the key elements 4 is open, and the measured frequency is fed to the controlled frequency divider 8.

After detection, the constant voltage 39 is fed to the input of differentiating element 2, the output signal of which 1% s 2 is the first derivative of the input voltage

 1%, x1 Thus, the voltage Ugt, | 5 describes the rate of change of voltage u) (, and when the frequency depends linearly on the measured parameter (for example, when converting signals from potentiometric sensors to frequency and rate of changing parameter).

The voltage 22 is fed to the input of the threshold element 3 having a certain threshold and release threshold 23 (Fig. 2). When triggered, the output signal of the element 3 is supplied to the control inputs of switches (for example, flip-flops) 6 and 7. The differentiated fronts of the output pulses of the control flip-flop 14 are fed to the other inputs of flip-flops b and 7.

The output pulse of the trigger 7 is supplied to the element AND 13, to the second input of which pulses are fed from the second output of the control trigger 14. From the output of the element 13, the signal 1 is fed to the control input of the key element 11, which

When triggered, one of the triggers of the divider 9 of the measured frequency shunts. At the same time, in the next conversion cycle, the division factor of divider 9 is two times less than in the first 5 cycles.

The time taken to form TC2 (Fig. 2) of the second code N and its size is also reduced.

After the controlled 0 splitter B is filled with the pulses of the measured frequency, its output signal changes the state of the flip-flops 14, and the second conversion cycle Tc2 begins. In the next cycle of transformation of the TSS, trigger signal 6 and key elements 10 and 12 are triggered in the presence of a signal from threshold element 3, as a result of which the division factor of the frequency of divider 8 is also halved compared to the initial value. In the absence of a signal from the output of element 3, the division coefficients of both dividers are maximum, and the compression of information 5 does not occur (TC1, TC5.

Thus, the division factor 37 (Fig. 2) of each divider is set automatically before the start of each conversion cycle Q or according to the rate of change of the measured frequency in the previous conversion cycle.

The input signals 38 can be input into the computer via the clock pulses 31, which are formed on the fronts of the output pulses of the control trigger and enter the computer via the OR 15 element (the device's synchronous output).

The output pulses from the trigger 14 are fed to a signal generator made according to the circuit of the code converter on the counters 19 and 20, the elements 17 and 18, controlled by the first inputs by the output pulses. At the second inputs of the elements And 17 and 18 5 receives high-frequency signals from the output of the crystal oscillator 16.

The block diagram of the device and the timing diagrams of its operation relate to devices having one threshold. element .3.

In principle, a system of n PU with different thresholds and corresponding functional units can be used, ensuring the operation of 5 controlled frequency dividers with a division factor having n values.

The application of the proposed device allows reducing the time for entering information into a computer and increasing the reliability of the results obtained when measuring dynamic processes.

Claims (2)

1. Kasatkin A; C. Automatic signal processing frequency sensors. M., Energie, 1966, p. 24-78. , 2. Malov B.C. and others. Telemetry, 0 M., Energie, 1975, p. 233-232 prototype