SU920720A1 - Device for computing the ratio of time intervals - Google Patents

Description

(5) DEVICE FOR CALCULATING RELATIONSHIPS

I

The invention relates to automation and computing and can be used in information and measurement systems for building specialized computing / computing devices with a time-pulse form of information representation.

A device containing a time interval meter is known, the inputs of which are connected to the inputs of the device, the digital output is connected to the counter input, and the control output directly to the control input of the valves and to one of the inputs of the collecting element via the delay element, the code comparison unit, the first inputs of which connected to the outputs of the counter, the second inputs to the outputs of the register, and the output to the input of the result counter and to the other input of the collecting element, the output of which is applied to the input of the counter zeroing and the outputs p AGRE OF TIME INTERVALS

Dov counter - to the inputs of the memory register through the valve. one.

However, it can perform the operation of dividing time intervals only separated in time with one another. If necessary, calculate the ratio of time intervals that partially coincide in time (including time intervals whose leading edges

10 coincide in time), this device can not be used. This limits its functionality and scope.

It is also known a device for

ts time ratio calculation, containing a pulse generator, two AND elements, two pulse counters, a result counter, a code comparison circuit whose inputs are connected to the information outputs of the first and second pulse counters, the counting inputs of which are connected to the outputs of the first and second AND elements, respectively the first inputs of the elements I are connected to the output of the pulse generator, the second input of the first element I is connected to the first input bus of the device, the output of the code comparison circuit is connected to the input of ki-zero pulses of the second counter

The disadvantage of this device is the need for a time shift (delay by time t,) of a pulse with a duration corresponding to a larger time interval tri, thereby increasing the time t and calculating the ratio of time intervals T

t th T,

and the digital measurement accuracy of the indicated ratio decreases.

t

four- -.

T T-, T

- - measurement error, obgde T

due to a delay tj. one

The closest technical

The essence of the invention is a device for calculating the ratio of time intervals, containing a pulse generator, two AND elements, two pulse counters, a result counter, a code comparison circuit whose inputs are connected to the information outputs of the first and second counters and pulses, the counting inputs of which are connected to the outputs respectively, the first and second elements And the first inputs of the elements And connected to the output of the pulse generator, the second input of the first element And connected to the first input bus device output Comparison code is connected to the input of the zero setting of the second pulse counter, the element NOT, the one-shot, the element OR, and the inputs of the one-shot and the element are NOT connected to the first input bus of the device, and the outputs to the first input of the element OR and the second input of the second element AND, the third input of which is connected to the second input bus of the device, the second input of the OR element is connected to the output of the code comparison circuit, and the output to the counting input of the result counter.

A disadvantage of this device is the low accuracy of the calculation of the ratio of time intervals,

The purpose of the invention is to improve the accuracy of the device

The goal is achieved by the fact that a device for calculating the ratio of time intervals, comprising a first pulse generator,

two elements AND two pulse counters, a result counter, a NOT element, a one-shot, a code comparison circuit whose inputs are connected to the information outputs of the first and second

pulse counters, the counting inputs of which are connected to the outputs of the first L of the second elements And, the first input of the first element And connected to the output of the first generator of pulses, the second input of the first element And connected to the first input bus of the device, the output of the comparison circuit of the codes the pulse counter, the inputs of the one-shot and the element are NOT connected to the first input bus of the device, and the output of the element is NOT to the first input of the second element I. The second input is connected to

The second input bus of the device contains a second pulse generator, the output of which is connected to the third input of the second element, And the output of the single-oscillator is connected to the input of the higher bit of the result counter, the counting input of which is connected to the output of the code comparison circuit.

The drawing is a diagram of the device.

A device for calculating the ratio of time intervals contains the element AND 1, the first generator of 2 pulses, the counter of 3 pulses, the element NOT to the element AND 5, the counter 6

-,

pulses, circuit / code comparison,

second generator of 8 pulses, one-shot 9, a binary-decimal counter 10 pulses with a fixed comma.

The device works as follows.

The first and second input buses of the device are pulses of a duration corresponding to

Claims (3)

time intervals T and TQ, the ratio of which is required to be calculated. Pulses with a frequency P from the output of the generator 2 pass through the ele1 during the time interval I of the shaft T, into the counter 3, the contents of which linearly increase as it is filled and at the time corresponding to the end of the specified interval becomes equal N, F. This code value is subsequently kept unchanged in counter 3 during the whole measurement time. The pulse with a duration corresponding to the time interval T is also inverted by the inverter and fed to the And 5 for the last element; as a result, pulses with a frequency FIJ from the output of the generator 8 during the specified time interval do not pass to the pulse counter 6. The ratio between the frequencies F (where n is an integer that determines the accuracy of the calculation. In the binary-decimal counter 10, the number of decimal digits The odds are equal to the number of un-I (1 bit of units). At the moment of time corresponding to the end of the time interval T, the one-shot 9, whose input is connected to the first input of the device, forms a short pulse that switches the first trigger of the ten-bit one c of the binary counter 10 into a single state. This means that exactly one time interval T was laid over a longer time interval T. At the same time, AND 5 opens, since the output potential of the inverter is now high and the same potential at the second input of the device, and the pulses from the output of the generator 8 begin to fill the counter 6, the content of which f increases until it reaches N j. The moment of equality is recorded by the code comparison circuit 7, the pulse from the output of which, first, resets the counter 6 and secondly oh, is stored in the result counter 10. This means that the time interval 10-T 1 is packed in a longer time interval TQ. The content of Y (counter 6 again begins to increase as the element 5 is open and the pulses from the generator 8 output continue arrive at counter 6, and increase until it becomes equal to HJ. The further sequence of operations is similar to that considered by you - the block 7 compares the codes, the pulse from the output of which again resets counter 6, is triggered, is entered into the counter of result 10, etc. The calculation process ends at the point in time corresponding to the end of the time interval TQ. Thus, the proposed device calculates the ratio of time intervals with an accuracy of the nth digit after the comma when it is known only with an accuracy of one (integer) . Apparatus of the Invention A device for calculating a time ratio comprising a first pulse generator, two AND elements, two pulse counters, a result counter, a HE element, a single vibrator, a code comparison circuit whose inputs are connected to information outputs of the first and second pulse counters whose counting inputs are connected respectively, with the outputs of the first and second elements And, the first input of the first element And is connected to the output of the first pulse generator, the second input of the first element And is connected to the first input one bus device, the output of the comparison code is connected to the input of the zero setting of the second pulse counter, the inputs of the one-vibrator and the element are NOT connected to the first input bus of the device, and the output of the element NOT to the first input of the second element And whose second input is connected to the second input bus of the device , in order to improve accuracy, it contains a second pulse generator, the output of which is connected to the third input of the second element And, the output of the one-shot is connected to the input of the higher bit of the counter cut ltata, a counting input coupled to an output of the circuit sraveni codes. Sources of information taken into account in the examination 1.ABtopCKoe certificate of the USSR 391728, cl. H 03 K 13/20, 1971. 2. Authors certificate of the USSR 579628, cl. G 06 G 7/16, 1976. 3. Authors certificate of the USSR 698006, cl. G About G 7 / 16,1979 (protype),