SU403053A1 - LINEAR FREQUENCY CONVERTER - Google Patents

Description

one

The invention can be used in information-measuring and computing equipment, in devices of automation and remote control.

. A linear frequency converter is known, comprising a reference frequency generator and two reversible counters, the addition and subtracting buses of which are connected to the input gates.

However, the known transducer does not allow obtaining a code proportional to the difference of the squares of the two varying frequencies.

In order to expand the functionality, a third reversible counter with two input gates is introduced into the proposed converter, two delay elements, including the OR circuit, and three flip-flops, one of which is connected to the Start signal by the first input - delays to the reset bar of the first reversible counter and to the reset tires of the second and third reversible counters directly, the second input trigger is connected to the output of the second reversible counter, and the input of the zero setting is with the output of the second delay element, also connected to the first input of the second trigger, the output of which is connected to the first input valves of the reversible counters.

the second input is with the output of the third reversible counter, and the zero setting input is with the “Start” signal bus connected also to the zero setting input of the third trigger,

the first input of which is connected to the output of the second reversible counter, the second input to the output of the third reversing counter, and the output to the second input valve of the first reversing counter, the output of the first trigger connected to the second input valve of the third reversing counter, the first input valve of which is connected to the output reference frequency generator. The drawing shows the block diagram of the proposed linear frequency converter. The converter consists of two-input valves 1-6, generator 7 of the reference frequency, reversible counters 8-10, I-13 flip-flops with separate inputs and elements

delays 14 and 15, each of which includes a two-input "OR at the input.

Convertible frequency / 2 is fed to the first inputs of valves 1 and 4, convertible frequency / 2 is fed to the first inputs of valves 2, 3 and 6. The output of the generator 7 of the reference frequency is connected to the first input of the valve 5. The second inputs of the valves 1-6 are controlled by single outputs triggers 11-13; for example,

trigger output 11 connects to the input of valve 6, trigger output 12 to the inputs of valves 2, 4 and 5, and the output of trigger 13 to the inputs of valves 1, 3. The outputs of valves 1, 3 and 5 are connected to the folding tires (+) counters 8 , 9 and 10 respectively, and the outputs of the valves 2, 4, b - with the subtraction tires (-) counters 8, 9 and 10, respectively. The transfer output from the high bit of counter 9 is connected to the nerve input of the trigger unit 11, to the first inputs of the delay elements 14, 15 and to the first input of the zero setting of the trigger 13. The transfer output from the high bit of the counter 10 is connected to the first input of the zero zero setting 12 and the installation input of the trigger unit 13. The output of the delay element 14 is connected to the reset bus of counter 8, and the output of the delay element 15 to the output of the zero setting of trigger 11 and the installation input of the trigger unit 12. The command "Start is fed to the reset buses of counters 9 and 1 0, to the second inputs of the delay elements 14 and 15, to the second input of the installation of the trigger unit 11 and to the second inputs of the zero setting of the triggers 12 and 13.

The output value of the converted frequencies, / 1 and / 2, is the N code read from counter 8.

The operation of the proposed linear frequency converter is carried out in three cycles.

The first cycle of the first cycle starts with the command Start. At the same time, the “Start” signal writes the numbers “O to counters 9 and 10, respectively, sets trigger 11 to state“ 1, and triggers 12 and 13 to state “O. After the installation of the flip-flops 11-13, the valves 1 and 3 are closed by the trigger 13, the valves 2, 4 and 5 are closed by the trigger 12, and the valve 6 is opened by the trigger 11. This state of the converter circuit elements is initial for the start of the first clock cycle. In addition, the start signal goes to the inputs of the delay elements 14 and 15. After the time t required to poll the counter 8, the signal from the output of the delay element 14 nullifies the counter 8.

Since the valve 6 is open by the trigger 13, the frequency pulses f2. subtracted from counter 10. After the time t / i, 2, determined or set by the delay time of the delay element 15, a tz command is issued from the output of this element, according to which the trigger 11 is set to the state "O", which causes the valve 6 to close, and trigger 12 is set to state "1, opening valves 2, 4, and 5. Issuing the tz command ends the first and begins the second cycle of the converter.

In the second cycle, frequency fz pulses are subtracted from counter 8, frequency fi pulses are subtracted from counter 9, and frequency / o pulses from the reference oscillator 7 are output to the contents of counter 10. a pulse from the higher bit of the counter), which ends the second cycle of the converter and begins the third.

The ts command sets the trigger 12 to the state "O, and the trigger 13 to the state" 1.

At the same time, valves 2, 4 and 5 are closed and valves 1 and 3 are opened.

In the third cycle, the frequency pulses / i are summed with the contents of counter 8, and the frequency pulses / 2 are summed with the contents of counter 9. Reversible counter 10 is zeroed and closed at the inputs by gates 5 and 6.

At the moment of zeroing of the counter 9, a command is issued (transfer pulse from the highest bit of the counter), according to which the trigger 11 is set to the state "1, and the trigger 13 is set to the state O. Upon completion of the installation of the triggers 11 and 13, the valves 1 and 3 are closed by the trigger 13, and the valve 6 is opened by the trigger 11.

Since the counters 9 and 10 are zero, the circuit elements of the converter take the initial state for the beginning of the first clock cycle. In addition, the ti command is added to the other inputs of the delay elements 14 and 15, which ensures the reset of the read code from counter 8 and the setting of the duration of the first clock cycle Ji, 2, determined by the delay time of the element 15.

This ends one cycle of operation.

a converter consisting of the three cycles described above, and another one starts.

Subject invention

Linear - a frequency converter containing a reference frequency generator and two reversible counters, the addition and subtraction buses of which are connected to the input gates, characterized in that, in order to extend the functionality, a third reversible counter with two input gates is inserted into it, two elements delays, including the OR circuit, and three flip-flops, one of which is connected to the Start signal signal by the first input, which is also connected via the first delay element to the reset bar of the first reversing

the counter and to the reset tires of the second and third reversible counters directly, the second input trigger is connected to the output of the second reversible counter, and the input of the zero setting is connected to the output of the second delay element connected also to the first input of the second trigger, the output of which is connected to the first input reversing valves counters, the second input - with the output of the third reversible counter, and the input

Zero settings - with the “Start” signal bus connected also to the input of the third zero trigger installation, the first input of which is connected to the output of the second reversible counter, the second input - to the output of the third

reversible counter, and the output - with the second

the input valve of the first reversible counter, and the output of the first trigger is connected to the second input valve of the third reversing counter, the first input valve of which is also connected to the output of the reference frequency generator.

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