SU1308919A1 - Device for measuring frequency ratio of two signals - Google Patents

Abstract

The invention can be used to measure the ratio of frequencies, periods, as well as the frequency and period of electrical signals. The purpose of the invention is to increase the speed of the device. The device contains a processor 1, counters 2 and 3 pulser, RS-flip-flop 4, triggers 5 and 6, element OR II and elements AND 13 and 14. The introduction of triggers 7-10, element OR 12 and the formation of new functional connections eliminate the need for preparatory measurement aiming to establish which of the frequencies i and i are 6onbme. The capabilities of the device can be expanded by entering 2 and 3 pulses of different numbers N and M into the counters 2 and 3. Tay, by setting N, 1, and N, 1, can be measured; the duration of one-time time intervals that satisfy the condition of the interval TC. By setting N equal to an integer, the duration of a different number of periods of unknown frequency can be measured. 3 il. i SL 00 about 00 with so uu.f

Description

113

The invention relates to a measurement technique and can be used to measure the ratio of frequencies, the ratio of periods, as well as the frequency and period of electrical signals.

The purpose of the invention is to increase the speed by reducing the measurement time.

Figure 1 shows the structural diagram of the device; Figures 2 and 3 show time diagrams explaining its principle of operation.

The device contains a processor 1, counters 2 and 3 pulses, R5-trigger 4, triggers 5-10, elements Ш1И .11 and 12, elements И 13 and 4, inputs 15 and 16, respectively, frequencies

1, the bus 1 7 data.

Bus 17 of the processor 1 is connected to the information inputs and outputs by a counter 2 and 3 pulses, with the first control output of processor 1 connected to the 5th input of the K5 trigger 4, the second and third controlling outputs to the data recording inputs of the counters 2 and 3 pulses, and the fourth and fifth control outputs to the data reading inputs, respectively, of the counters 2 and 3 pulses, the counting inputs of which are connected respectively to the outputs of the elements 13 and 14. The first inputs of the latter are the inputs of the first and second measurements, respectively emy one, and these inputs are combined respectively with the C-inputs of the flip-flops 5 and 9 and the flip-flops 6 and 10, and the second inputs of the AND 13 and 14 elements are connected to the output of the OR 11 element and the control input of the processor 1. The signal outputs of the counters 2 and 3 pulses are connected via the OR element 12 and the R input of the RS trigger 4, the output of which combines the D inputs of the flip-flops 5 and 6. The outputs of the flip-flops 5 and 6 are connected to the D inputs of the flip-flops respectively 7 7 and 8.9, as well as With inputs respectively triggers 8 and 7, the outputs of which are connected to the R-inputs respectively triggers 9 and 10. Inputs element OR 11 is connected to the outputs of the triggers 9 and 10.

The device works as follows.

Before starting the measurement, the processor 1 sets in the initial state all the elements of the device

five

five

0

0 5 0

-five

192

The gistra of programmable counters 2 and 3 pulses enter the code of the number N -1, where N is some specified number. In this case, the triggers 4-6, 9, and 10 are in zero, and the triggers 7 and 8 are in arbitrary states. At the moment tg (Figures 2 and 3) of the beginning of the measurement, the processor produces at its first control output a signal 1, which is. ry translates the R5 flip-flop 4 into a single state. The pulses of frequencies i and f, which are closest to b oo, and tji2 and tC2 bring in 1 from the output of RS trigger 4, respectively, to triggers 5 and 6. If the first time pulse arrives after the tg, frequency pulse in this case corresponds to the time diagrams in figure 2) then the first one is set to the trigger one state. Switching its output signal from O to 1 writes O from the output of trigger 6 to trigger 8, allowing recording 1 to trigger 10. Nearest frequency pulse i. (the moment i, except for recording 1 into trigger 6, writes 1 into trigger 10, 1 from whose output through the element OR 11 allows the passage of frequency pulses (and i, respectively, through elements 13 and 14 and to the counting inputs of counters 2 and 3 Switching the output signal of trigger 6 from O to 1 writes 1 to trigger 7, 1 from whose output holds trigger 9 in the zero state during this measurement. If one of the counts of programmable counters 2 and 3 pulses of frequency pulses 1, or .j given the number N -1 (the moment tpl on his si A rotary output appears 1, which, via OR 12, resets R 5-flip-flop 4. The closest pulses tj and fJ after ip write O into triggers 5 and 6, and the closest pulses of frequency 1 (ij following the closest tp of the frequency pulse f, (the moment i K,) writes O to the trigger 10. Switching the output signal of the trigger 10 from II111 g MQir element to the control input of processor 1 indicates the end of the counting of pulses, and O from the output of the element OR 11 prohibits the passage of frequency pulses i, and f through the elements And 13 and 14 on the counting inputs s 2 and 3 meters impul3I 089I94

owls The processor 1 reads the contents. The device capabilities can be counters of 2 and 3 pulses and performs the necessary calculations from the ratio

i, N,

 C |

„......,

sg

are expanded - by entering into counters 2 and 3 pulses of different numbers N, and N. So, for example, the problem is M | M | 1, and NJ 1, can be measured

the duration of one time

(J

intervals that satisfy the condition ц i Ni / ij; By setting N to be an integer, one can measure the length of the bone of a different number of periods of unknown frequency, etc.

Claims (1)

Invention Formula A device for measuring the relation- is set to one state - (5 nor the frequencies of two signals, containing processor, two pulse counters, three flip-flops, one of which is R5-flip-flop, element OR, and two elements 5 in flip-flop 7, and bl; 1 the strongest pulse is AND, in which the data rate npouecco-- frequencies j (time ij, ), besides recording 20 PS, is connected to informational inputs 1 to trigger 5, records I and informational outputs of pulse counters, the first control output of the processor - with 5 input where M and sr .-- the contents of counters 2 and 3, respectively, at the end of the account. If the first pulse after frequency i comes the closest frequency pulse 1 to this case correspond to the timing diagrams in FIG. 3), then the first trigger 6 (moment. Switching its output signal from O to 1 writes O from the output of the trigger output of trigger 6 to the trigger 9, 1 from the output of which through the element OR 11 allows the removal of pulses from both the trigger, the second and third control frequencies. Switching of the output signal 25 output outputs - with recording inputs A trigger of 5 from O to 1 loads into the trigger 8, 1 from the output of which keeps the trigger 10 in the zero state during the entire measurement. Further, the device works in the same way as in the previous case, except for the fact that the pulse of frequency f, nearest after time i, (moment data, respectively, in the first and second pulse counters, and the fourth and fifth control outputs - with data reading inputs, respectively, 30 of the first and second pulse meters, the counting inputs of which are connected respectively to the outputs of the first and second And elements, and the first inputs of And elements the OR element, and the signal outputs of the first and second counters of the pulses are connected to the inputs of the second ) writes O from the output of the trigger 35 are the inputs of the first 6, respectively, to the trigger 9, switching the output and second measured frequencies, and the second signal of which from 1 to O, the inputs are interconnected, T leads to the same change It is consistent with the fact that, with the signal of the element OR 11. purpose of speed, it introduced four triggers and the second Formula (I) reflects the assumption that the counting time of both frequencies is the same, i.e. . From the diagram 2 and 3) it can be seen that the absolute element OR, the output of which is connected to the measurement error from such 45 to the R-input of the R5 trigger, the output The 5th flip-flop is connected to the D-inputs of the first and second flip-flops, the outputs of which are connected to the D-inputs of the third, sixth, and fourth frequencies, respectively, at least equal to the specified, fifth, flip-flop, as well as to the number N, that the C-inputs, respectively, of the fourth relative error do not exceed the third and triggers, the C-inputs of the first value i 1 / N. of the first and fifth triggers are connected to The device allows you to exclude the first input of the first element AND, the need for preparatory measurement of the 55 C inputs of the second and sixth triggers, the aim of which is to determine how the first input of the second element I, k of frequency i i is greater, and the output The first element OR is connected by the highest speed performance. with the second inputs of the first and second the assumption does not exceed the duration of one period by the greater frequency i. and i, and, taking into account the fact that the number of periods is greater than K5 trigger, the second and third controllers, respectively, in the first and second pulse counters, and the fourth and fifth control outputs - with data read inputs from the first and second pulse meters, respectively, the counting inputs of which are connected to the outputs of the first and second elements, respectively, the first inputs of the elements I vl the element OR, and the signal outputs of the first and second counters of the impulses I are connected to the inputs of the second Four triggers are introduced and the second OR element, the output of which is connected to the R-input of the R5 trigger, output 51308919 6 And elements and with the control input of the sixth trigger, R-inputs of which processor, the inputs of the first element are connected respectively to the outputs OR connected to the outputs of the third and fourth triggers. /.JLJLJLJLJ|JaJL Figg Fig.Z