SU924859A1 - Frequency-to-code converter - Google Patents

Description

(54) FREQUENCY CONVERTER TO CODE

I

The invention relates to computing and can be used to communicate a computer with external devices, in control and simulation systems, in measurement systems.

A known frequency-code converter containing a trigger connected to a differentiating circuit, control triggers, valves, an exemplary frequency generator, a inhibitor circuit, a counter with a decoder, a switch and a controlled frequency divider til-. .

The disadvantage of this converter is that it does not take into account the sign of the value being converted.

The closest to the present invention is a frequency converter into a code containing a stable frequency generator, the output of which is connected to the counter input through a first key, to the code-frequency information input through the second key and directly to the clock input of the counter.

the code-frequency generator, the first time interval generator, the output of which is connected to the installation input, a counter and the second input of the second key, and the code-frequency converter output is connected via the second time interval generator to the second input of the first key and the installation input of the code converter to frequency 2 .

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The disadvantage of the converter is that it does not take into account the sign of the frequency to be converted.

The purpose of the invention is to expand the functionality of the device,

15 namely, taking into account the sign of the converted value.

The goal is achieved by the fact that in the frequency converter in the code containing a generator, the output of which

20 through the first key is connected to the summing input of the counter, directly connected to the clock input of the code-frequency converter and through the second

key - with the information input of the code-frequency converter, the output of which is connected to the second input of the first key through the time interval shaper, three triggers, two delay elements, five keys and two OR elements are added, the output of the first trigger and the second additional keys and through the first delay element with the reset input of the second trigger, to

the counting input of which is connected to the reset input of the third trigger, the output of the second trigger is connected to the inputs of the third and fourth additional keys and through the second delay element to the reset input of the first trigger, to the counting input of which the direct input of the third trigger is connected, the output of which is connected to the second inputs the first and fourth additional keys and the third input of the first primary key, and the inverse output is connected to the second inputs of the second and third keys and to the first input of the fifth additional key the second input of which is connected to the generator output, while the output of the time interval generator is connected to the input of the first OR element and to the third input of the fifth additional key, the output of which is connected to the subtractive input of the counter, the first and third additional switches are connected to the second input the second key, and the outputs of the second and fourth additional keys through the first element OR are connected to the reset input of the code-frequency converter.

The drawing shows a block diagram of the frequency converter in the code.

The converter contains input buses 1 and 2, through which impulses of positive and negative frequency increments are received, three triggers 3, 4 and 5, keys 6-11, first delay element 12, second delay element 13, element OR 14, key 15, element OR 16, the code-frequency converter 17, the generator 18, the counter 19, the time generator 20, the bus 21, which is the output of the device.

The device works as follows.

The converter is intended to be converted into additional code.

pulse flow with a low frequency value. The sign of flow is determined by the presence. impulses on tires 1 or 2. The moments of arrival of impulses along tires 1 and 2 are separated in time, i.e., impulses cannot be simultaneously present on different tires. The converter allows you to measure the frequency value over a time equal to two periods.

frequency conversion. The first positive increment pulse is fed through bus 1 to the counting input of trigger 3 and to the direct input of trigger 4 characters. As a result, triggers 3 and 4 are set to

5 th unit state. The key 6 to the signal from its output through the element OR 14 and the key 15 enables the passage of the frequency from the output of the generator 18 to the information input of the code-to-frequency converter 17. When the second pulse arrives on the bus 1, the trigger 3 is reset to the zero state, the key 6 is locked and the frequency passes from the generator 18 to the converter 17

Claims (2)

5, the code-frequency is terminated. During the period of the frequency being converted, the code-frequency in the input register of the code-17 converter forms a code directly proportional to the period, since the number of pulses received at the input of the converter 17-cd frequency from the generator 18 is directly proportional to the frequency of the period of the frequency being converted. Immediately after the input register of the code-frequency converter 17 is filled, the pulse from its output sets the shaper of time intervals to one state, and through the key 8 to the summing input of the counter 19 the frequency starts to flow from the generator 18. The pulse output to the counter 19 continues until effects of the second pulse from the output of the 17 code-hour converter. In this case, the time shaper 20 is reset to zero s (x; the current, the key 8 is locked, and the code-frequency converter 17 is reset to the initial state through the OR element 16. The code value in the counter 19 is directly proportional to the time interval between two output pulses of the converter-code frequency, inversely proportional to the code written in it, and directly proportional to the value of the frequency to be converted. The code from counter 19 is removed on W 21, while the counter itself is turned on (not shown). second, fourth, and subsequent impulses; BUS on bus 1; the described process repeats; The first pulse of negative frequency increment goes on bus 2 to the counting input of trigger 5 and to the reset input of trigger 4. As a result, trigger 5 is set to one, and triggers 3 and 4 are stabilized in the zero state. Key 9 is activated. Next, the converter operates in the same way as with positive increments (/ rf of the frequency. The difference is that the signal from the inverted output of the trigger 4 opens the key 11. As a result, the frequency from the generator 18 goes to the subtracting input of the counter 1-9, in which the additional code of the negative number is formed If after the first, third, etc. pulses of the positive the increment of the frequency in the device comes a negative pulse, then the trigger 4 is set to the zero state, and the trigger 5 to the unit state. The key 1O is activated (since the trigger 3 due to the presence of the element, the delay is still reset) and a signal is set at the reset input of the converter 17 of the code-frequency that establishes its input state. Further, the trigger 3 is reset, the key 10 is closed, the key 9 is turned off. And the device operates as in the case of arrival of negative frequency increment pulses. If, after an odd pulse of a negative frequency increase, a positive increment pulse arrives, the key 7, the code-to-frequency converter 17 operates, is reset, the trigger 3 is set, the trigger 5 is reset, the switch 6 is activated and then the device operates similarly to the arrival of a pulse of positive increment. The use of elements in the converter (three triggers, two delay elements, five keys and two OR elements) allows one to learn the sign of the frequency to be converted. This method of conversion is necessary when the LIBM jointly works with frequent sensors, the output value of which is represented in the form of two streams, depending on the sign of the measured value. To implement this type of transformation, it is necessary to use two converters similar to the prototype. Consequently, the use of the proposed transducers in the construction of a control system makes it possible to double the number of frequency-code transducers for receiving information from sensors with ternary coding. Claims of frequency converter in code, A generator, the output of which through: the first key is connected to the summing input of the counter, is directly connected to the clock input of the code-frequency converter and through the second key to the information input of the code-frequency converter, the output of which is connected to the second input of the first through the time converter key, characterized in that, in order to extend the functionality, it additionally introduces a delay element, five keys, two OR elements and three flip-flops, the output of the first of which is connected to With the first and second keys and through the first delay element with the reset input of the second trigger, to the counting input of which the reset input of the third trigger is connected, the output of the second Tpfnrepa is connected to the inputs of the third and fourth additional keys and through the second delay element with the reset input of the first trigger, to the counting input of which is connected to the direct input, the third trigger, the direct output of which is connected to the second inputs of the first and fourth additional keys and the third input of the first main key, and Ш1- The digital output is connected to the second inputs of the second and third keys and to the first input of the fifth additional key, to the second input of which the generator output is connected, while the output of the time slot generator is connected to the input of the first OR element and the third input of the fifth additional key, whose output connected to the subtracting input of the counter, the outputs of the first and third additional keys through the second element OR are connected to the second input of the second key, and the outputs of the second to the fourth additional keys through the first the OR element is connected to the code-frequency converter reset input. Sources of information taken into account during the examination 1. USSR author's certificate No. 372684, cl. H 03 K 13 / 2O, 1973. 2. USSR author's certificate number 705674, cl. H 03 K 13/20, 1979.