SU1007081A1 - Device for converting time intervals into code - Google Patents

Abstract

A DEVICE FOR CONVERSION OF TIME INTERVALS IN THE CODE, containing the generator of the reference frequency pulses, the main counter, the output unit of the AND elements and the source of the readout signal, the output of which is connected to the enable input of the output unit of the elements And, the information inputs of which are connected to the outputs of the bits of the main counter, characterized in that, in order to expand the range of convertible intervals, while maintaining the measurement accuracy and simplicity of the device, a scaling circuit, a block of elements AND decryption are introduced into it a torus and an additional counter, the output of the pulse generator of the reference frequency is connected to the input of the counting circuit and to the first input of the first group of inputs of the I block, the remaining n inputs of the first group of inputs of the I block are connected to the outputs of the counting circuit, the output of the I block are connected to the counting input of the main counter, the output of the higher bit of which is connected to the counting input of the additional counter, the output of the j series of which is connected to the additional information inputs of the output block Single-input AND gates and a decoder, the outputs of which are connected to the second group of inputs of the AND block, a third input coupled to the input device bus.

Description

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UI-4 The invention relates to measuring nodes of information-measuring and measuring-recording systems and can be used in measuring and recording time parameters (impulse duration, phase shift or period between pulses, etc.) of pulse signals. A device is known for converting a time parameter of a pulse signal frequency into a code, containing a pulse generator of a reference frequency, the output of which is connected via a switch to the counter input to the bits of which is connected to the corresponding memory register inputs, and the reset pulse generator is connected to one input the OR element, the second input of which is connected to the input source, and the output of the OR element is connected to one of the trigger inputs, the output of which is connected, to the input of the key control ij. I The disadvantage of this device is the limited range of change of the converted frequencies for a given conversion accuracy and the output code width. The closest in technical essence to the present invention is a device for converting Hoi time; o a pulse signal parameter into a code comprising a reference frequency pulse generator, an AND circuit, a counter, an AND block and a read signal source that is connected to the AND The control inputs of which are connected to the outputs of the counter, the counting input of the latter is connected to the outputs of the AND circuit, the input of which is the input of the device, and the other input of the AND circuit is connected to the pulse generator of the reference frequency m. However, in the known device, the range of convertible time napaNieTpoB pulsed signals with a measured measurement accuracy and a limited size of the output digital block is substantially mgsh. The purpose of the invention is to expand the range of convertible intervals while maintaining measurement accuracy and device simplicity. This goal is achieved in that a device for converting time intervals into a code containing a reference frequency generator, a main counter, an output unit of elements AND, and a source of a readout signal, the output of which is connected to the permitting input of the output unit of elements AND connected to the outputs of the bits of the main counter, introduced a scaling circuit, a block of elements and, a decoder and an additional counter, the output of the generator, pulses of the reference frequency being connected to the recce input of the first circuit of the first group of inputs of the block of elements tl, the remaining p INPUTS of the first group of inputs of the block of elements And are connected to the outputs of the scaling circuit, the output of the block of elements And is connected to the counting input of the main counter, the output of the higher bit of which is connected to the counting input of the additional counter The outputs of the bits of which are connected by cf additional information inputs of the output block of the elements And and the inputs of the decoder, the outputs of which are connected to the second group of inputs of the block of elements And, the third input to orogo connected to an input device bus; FIG. 1 shows a block diagram of the device} in FIG. 2 - connection of the inputs and outputs of the block of elements I. The device contains a generator of 1 pulses of the reference frequency, a block of 2 elements AND, a main counter 3 for c-bits, an output block of 4 elements AND for - (- Kim) bits, a source 5 of signal readout , scaling circuit 6, an additional counter 7 per m bits and a decoder 8. The device operates as follows. The measurement starts after zeroing of the counters 3 and 7 (zeroing circuits are not shown in the drawing). The measured signals are fed to the input bus — the third input of the 2-element I. And since the additional counter 7 records only zeroes after zeroing, the decoder 8 generates a signal 1 only in the first wave, which allows only the impulses from the generator 1 to pass to the input of the counter 3. pulse frequency reference. These pulses from generator 1 fill counter 3. If at the end of the input signal counter 3 is not completely filled, the digital equivalent of Nf., 0 at its output fully corresponds to the duration of the measured signal at the zero code of additional counter 7 (N-}, 0). If counter 3 is completely filled, and the input signal is valid, then there is a natural zeroing of counter 3 and. the signal is simultaneously transmitted to the additional counter 7. The additional counter 7 through the decoder 8 and through the block 2 sends to the input of the counter 3 pulses generated by the scaling circuit 6, whose frequency is y times less than the frequency of the generator 1 pulses of the reference frequency. With this frequency, new

filling the counter 3 So, with the subsequent decrease in the frequency of the pulses in times in the scaling circuit 6, the new meter 3 is filled up,

From the Measured time interval is.

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frequency of the generator of pulses of the reference frequency -1} - reduction ratio

frequencies of signals from scaling circuit 6; - the number of additional bits of the counter; numeric output codes in decimal value - the number of counter bits 3.

and the frequency of the general Hz is chosen, the reduction ratio is 4, the accuracy is set to 0, p2 is possible with the help of an additional counter 7 and, accordingly, de-1 encoder 8 only 3 times to provide measurement of time parameters from 50 ms to 18 "Yu MKS with the total number of bits of output counters, equal to 15. While in the known device with a 15-bit counter it is possible to provide only the range from .50 ms to 510 μs (5 mlc). or in order to provide a range of 50 μs-μs,

0 it would be necessary to increase the number of bits of the output counter and the code to 45.

The use of the proposed device allows to obtain a technical effect, which consists in the possibility of converting time slots into code in a wide. the measurement range of time interval values with a given accuracy at a limited i digit of the output code (or counter, which: leads to saving of the magnetic carrier of the register and reducing the number of devices: converting different ranges from changing the values of the time parameters.

Claims (1)

(54.) A DEVICE FOR CONVERTING TIME INTERVALS TO A CODE containing a pulse generator of a reference frequency, a main counter, an output block of AND elements, and a source of a read signal, the output of which * is connected to the enable input of the output block of AND elements, the information inputs of which are connected to the outputs of the bits main counter, characterized in that, in order to expand the range of converted intervals. while maintaining the measurement accuracy and simplicity of the device, a conversion circuit, a block of elements And ·, are decoded p and an additional counter, and the output of the pulse generator of the reference frequency is connected to the input of the conversion circuit and to the first input of the first group of inputs of the block of elements AND, the remaining η inputs of the first group of inputs of the block of elements AND are connected to the outputs of the conversion circuit, the output of the block of elements And is connected to the counting input of the main counter, the output of the highest level of which is connected to the counting input of the additional counter, the output of the bits of which are connected to additional information inputs of the output block of elements And the inputs of the decoder, the outputs of which are connected to the second group of inputs of the block of elements And, the third input of which is connected to the input bus of the device.