SU911525A1 - Frequency dividing device - Google Patents

Description

(S) FREQUENCY DIVIDING DEVICE

t

The invention relates to automation and computing and can be used to divide two frequency signals.

To divide two frequency signals, any DIGITAL electron-counting frequency meter can be used, whose work is based on counting the number of pulses with a frequency equal to the frequency of the dividend, for a reference time interval, if instead of a reference interval a time interval proportional to the period of the divider frequency is formed.

Electronic counting digital frequency meters are known, comprising a control unit, a driver, a coincidence circuit, a multi-bit pulse counter, a time interval generator ClJ.

The disadvantage of such a dividing device is low speed, because the dividing time at

The requirement of high accuracy should be much greater than the period of the frequency of the dividend.

The closest in technical essence to the proposed device is a device containing a down-channel code-to-frequency converter, elements AND, counter, t | igger, frequency divider, performed on the basis of counter, register and c2to t2l circuit.

A disadvantage of the known device is the inability to perform the operation of dividing frequency signals.

IS

The purpose of the invention is to expand the scope of application of the device by performing the division of frequency signals.

20

The goal is achieved due to the fact that the frequency dividing device containing a two-channel code-to-frequency converter,

39

The first and second elements are And, the first trigger, the first counter, and the outputs of the first and second channels of the two-channel code-to-frequency converter are connected respectively to the first inputs of the first and second elements And, the second inputs of which are connected to the output of the first trigger, the output of the first element And is connected to the counting the input of the first counter, the output of the second element AND is the output of the device, contains a desh 4frator, two pulse makers, the third and fourth elements AND, the OR element, the second trigger, the second and third counters, etc. The first bit outputs of the first counter are connected respectively to the inputs of the decoder, the output of which is connected to the first input of the setup with a t / t of the first trigger, the first and second frequency inputs of the device are connected respectively to the first inputs of the first and second drivers of the pulses, the second inputs of which are connected to the installation input the device, the second Input setting zero of the First Trigger and the installation input of the unit of the second Ttwrrepa, the setting inputs of the zero of the first, second and third counters and the two-channel transducer code into the frequency, the outputs of the first and second pulse formers are connected to the first inputs of the third and fourth elements AND and the first and second inputs of the OR element, respectively, the output of which is connected to the installation input of the unit of the first trigger and the input setting of the second trigger of the second and fourth And elements and the reference frequency input of the two channel code-to-frequency converter are connected to the device frequency reference input, the output of the second flip-flop is connected to the third inputs of the third and Werth elements and whose outputs are connected to the counting inputs of respectively the second and third counters The discharge outlets are connected to respective inputs of the first and second transducer channels of bi-frequency code.

The drawing shows a diagram of the device.

Frequency dividing device contains two-channel converter 1 code and frequency, elements And

54

2 and 3, trigger k, counter 5 decoder 6, shapers 7 and 8 pulses, elements AND 9 and 10, elements OR 11, trigger 12, estimators 15-15 ,. group of elements AND 16, element OR 17, group of elements AND 18, element OR 19.

The device works following 1M.

The initial state of the device in

each measurement cycle is determined by the feed., on the installation input of the pulse device Reset, setting the trigger, pulse shapers 7 and 8, counters 5,13,1

; and 15, to the zero state, and the trigger i12 - to the single state. Pulse shapers 7 and 8, the inputs of which are received respectively pulses; frequencies j and%, form pulses whose duration is equal to the periods of these frequencies T and Tj.

For a time equal to the duration of the copied pulses, elements AND 9 and 10 are open, transmitting N and N to the inputs of counters 13 and H, respectively.

N f, T,.

P)

Na fo T2

with the end of the last of the periods Tf and Tg at the output of the element OR 11, a voltage drop appears, setting trigger 12 to zero, and trigger k - 6 unit state.

The counter 15, the group of elements AND 16 and the element OR 17 constitute the first channel of the converter 1, at the output of which, after counting in the counter 13 of the number N, the pulse-pulse sequence is formed with the following frequency f

Nv o

.

(2)

f where Nj, is the number capacity of the counters

13-15.

The counter 15, the group of elements AND 18 and the element OR 19 constitute the second channel of the converter 1, at the output of which, after counting in the counter IV of the number N, the pulse-frequency sequence is formed with the following frequency

f - N2 fo., h

Claims (2)

H - -ZH7. Pulses with the following frequency: from the moment the flip-flop C is set to one state through an open element AND 3 arrive at the counter of counter 5. When a certain specified number N is set at the output of the decoder 6, a voltage drop appears to which the trigger k is set to zero zero, and the elements 2 and 3 are closed. In this case, the trigger k is in the unit state for a time t equal to the unit state of the trigger element I 2 is also opened and the number of impulses SQ passes to the device output (s1e: the following frequencies f are equal to H Taking into account equations (1), ( 2), (3) and Ci), the expression (5) can be written Ne N N since N is a constant value, and the number of pulses arriving at the output of the device is directly proportional to the quotient from the division. frequency signal t per frequency signal f2. Formula of the invention Frequency dividing device containing a two-channel code to frequency converter, first and second elements AND, first trigger, first estimator, and the outputs of the first and second channels of the two-channel code-to-frequency converter are connected respectively to the first the inputs of the first and second elements And, the second inputs of which are connected to the output of the first trigger, the output of the first element And is connected to the counting input of the first counter, the output of the second element And is the output The house of the device, characterized in that, in order to expand the scope of application by performing the division of frequency signals, the device contains a decoder, two pulse drivers, the third and fourth elements AND, the element OR, the second trigger, the second and third counters, and the outputs The first counter is connected respectively to the inputs of the decoder, the output of which is connected to the first input of the zero setting of the first trigger, the first and second frequency inputs of the device are connected respectively to the first inputs of the first and second About pulse formers, the second inputs of which are connected to the installation input of the device, the second input of the zero setting of the first trigger and the installation input of the second trigger unit, the zero input of the first, second and third counters and the two-channel code-to-frequency converter, the outputs of the first and second pulse shaper are connected to the first, the inputs of the third and fourth elements AND, and the first and second inputs of the OR element, the output of which is connected to the installation input of the unit of the first trigger, respectively, and the input the home of the zero setting of the second trigger, the second inputs of the third and fourth And elements and the input frequency reference of the two-channel code-to-frequency converter are connected to the input frequency reference of the device, the output of the second flip-flop is connected to the third inputs t) and the fourth elements And the second and third counters, respectively, the bit outputs of which are connected to the corresponding inputs of the first and second channels of the two-channel code converter in MacTO ty. Sources of information taken into account in the examination of t. Kirianaka H.S. et al. Methods and devices for digital measurement of LOW and infra-low frequencies. Kiev, school, 975, p. eight. 2. USSR author's certificate "310257. cl. G About G 7/16, 1971 (prototype). ,