SU907457A1 - Device for comparing frequencies - Google Patents

Description

(5) DEVICE FOR CLUSTERING FREQUENCIES

I

The invention relates to a measuring technique, namely, digital devices for comparing pulse frequency to determine their difference, and can be used in digital error meter of pulse frequency signals, in digital controllers, in devices for tolerance control of technological parameters with frequency sensors etc.

A device for comparing two frequency-pulse signals is known, comprising a converter, a coincidence element, a time interval sensor, a threshold element, an adder, valves and a til recorder.

The disadvantage of this device is the difficulty of using in the range of low and infra-low frequencies under the condition of direct measurement.

The closest to the invention to the technical essence is a device for measuring the pulse repetition frequency, comprising a serially connected input bus, a first driver, a coincidence element, a divider, a delay element, a first counter, a register, first and second controlled dividers, a second counter and an output bus , while the second input of the second controlled divider is connected to the output of the first

to the counter, the register entry input is connected to the output of the divider, whose input is connected to the counting input of the first controlled divider, the setting inputs of the divider, register, counter, and controlled dividers through the second driver connected to the reset bus, and the second input of the coincidence element is connected to the output reference frequency generator 2.

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A disadvantage of the known device is the limited functional possibilities, namely: the impossibility of comparing the frequency-pulse signals, which limits the use of the device in digital and measuring devices. The purpose of the invention is to expand the functional capabilities of the device, which provides the ability to measure the instantaneous frequency value, as well as to obtain the difference value of two frequency signals. This goal is achieved by the fact that in a device for comparison of frequencies containing a serially connected first driver and a coincidence element, the second input of which is connected to the output of the reference frequency generator, as well as a serially connected divider, delay element, first counter, register, first and second controllable dividers and the second counter, while the second input of the second controlled divider is connected to the output of the first counter, the register entry input is connected to the output of the divider, and the setting inputs of the divider, country, counters and controllable dividers are connected to the output of the second driver, the serially connected driver, the distributor, the first match element and the OR element, as well as the serially connected register, the comparison unit, the second match element and the counter are additionally entered, while the output of the first main driver is connected with an additional input of the second driver and the second input of the distributor, the third input of which is connected to the input of the second driver, and the second output distribute l with dinene with an additional input of the main coincidence element, the output of which through the second input of the element OR is connected to the counting inputs of the divider and the first controlled divider whose setup input is connected to the input of the additional register, whose information input is connected to the second input of the comparator and the output of the second counter, input which is connected to the second input of the second additional element of the match, and the second and third inputs of the first additional element are connected to the outputs, respectively, of the torus reference frequency and additional shaper. The drawing shows a block diagram of the device. A device for comparing frequencies contains drivers 1–3, elements 4–6 matches, element 7 OR, distributor 8, divider 9, delay element 10, first counter 11, registers 12 and 13, first and second controlled dividers H and 15, second and additional counters 16 and 17, a reference frequency generator 18, a comparison unit 19, input buses 20 and 21, and a reset bus 22. The device works as follows. To set the device to the initial state with a pulse coming through the reset bus 22, the unit code is entered into the counter 11 and the register 12 via the shaper 2. With the same signal, the code corresponding to the maximum frequency value is written to the subtracting counter 16, and the remaining nodes of the device are set to zero state. A reset pulse 8 is set to allow the signals to pass through the coincidence element, I Compared frequencies are supplied to the input buses 20 and 21, and a signal is output at the output of generator 1, the duration of which corresponds to the period of higher comparing frequency. prepared by the resolving potential from the output of the distributor 8, with the result that the reference frequency pulses from the output of the generator 18 are fed to the input of element 7 OR, and then to the counting inputs of the divider 9 steps to , and the first controlled splitter 1, At the output of the controlled splitter 15, coding pulses are generated, the frequency of which nonlinearly decreases during the duration of the signal at the output of the driver 1. The coding pulses are subtracted from the initial number code recorded in the counter 16 in such a way that at the time of termination The period of the code in the counter 16 corresponds to the code of the instantaneous frequency value on the input bus 20 of the device. At the moment of termination of the signal at the output of the imaging unit 1, the distributor 8 switches and prepares the coincidence element 5, and simultaneously a pulse arrives at the output of the imaging unit 3, with which the code from the counter 16 is written

register 13 and prepare the remaining nodes of the device for the second cycle of operation. In the second cycle of operation of the device, during the period arrival time, the lower of the compared frequencies at the output of the imaging unit 3 generates a signal, which opens the coincidence element 5. At the same time, the coding pulses also go to the subtracting input of counter 16. At the moment of equality of the codes in counter 16 and register 13 recorded in the first cycle of operation, the output of the code comparison unit 19 produces a pulse unlocking the coinciding element 6, resulting in the counter 17 encoding pulses are received, the number of which, calculated in the interval of a difference of two periods, corresponds to the difference of the instantaneous values of the compared frequencies. At the end, the signal and at the output of the form 2 of the device 2 ends the device, and at the outputs Smartphones 17 and 16 are set to difference and lower frequency codes, respectively.

Thus, during the time when the device performs a full cycle, the codes of instantaneous values of comparable frequencies are removed from the outputs of counter 16, and from the outputs of counter 17 - the code of differences of comparable frequencies, which provides wider functionality of the device and expands its area of application.

Claims (2)

Invention Formula A device for comparing frequencies, containing in series the first driver and a coincidence element, the second input of which is connected to the output of the reference frequency generator, as well as the serially connected divider, delay element, first counter, register, first and the second controlled dividers and the second counter, while the second input of the second controlled divider is connected to the output of the first counter, the input the register entries are connected to the output of the divider, and the installation inputs of the divider, register, counters, and controlled dividers are connected to the output of the second driver, which is added so that, in order to expand the functionality, the connected driver, the distributor, the first match element and the OR element, as well as the serially connected register, the comparison block, the second match element and the counter, with the output of the first main driver connected to the complementary The second input of the second driver and the second input of the distributor, the third input of which is connected to the input of the second driver, and the second output of the distributor is connected to the auxiliary input of the main matching element, the output of which through the second input of the OR element is connected to the counting inputs of the divider and the first controlled divider; the input of which is connected to the input of the record of the additional register, whose information input is connected to the second input of the comparator unit and the output of the second counter, whose input connected to the second input of the second additional coincidence element, and the second and third inputs of the first additional matching element are connected to the outputs of the reference frequency generator and the additional driver, respectively. I Sources of information taken into account during the examination 1. USSR Author's Certificate tf «411381, cl. G 01 R 23/00, 1972. 2. USSR author's certificate ff 573766, cl. G 01 R 23/02, 1976. 4) L 4i.