SU1260976A1 - Versions of device for calculating ratio of time intervals - Google Patents

Abstract

This invention relates to the field of automation and computing technology. Common nodes and elements of both variants of the device are the reference frequency generator, AND elements, counters, trigger, OR elements, and a result counter. In this case, the device according to the first variant additionally contains the element NOT, and the device according to the second option - the one-shot. Simplification of the structural implementation is achieved by setting the trigger to its original state at the moment of time corresponding to the end of a larger time interval (the dividend signal) by connecting the set trigger input to the second input of the device. In addition, upro. The construction is achieved by applying a smaller time interval (divider signal) directly to the inputs of the OR elements (in the first version of the device) or to the counter reset input (in the second version), which allows maintaining the counter state of the results counter to be constant, 2 sp.f-ly, 4 Il. 1C

Description

one

1260976 J

The first output of generator 1 does not arrive at the counting input of counter 6. At the time point corresponding to the end of the first time interval, first, the falling edge of a pulse of duration T (passing through the OR 9 element at the counting input of counter 10 (Fig. 2 ( 4), in this counter, the records. The invention relates to automation and computing technology and can be used in information and measurement systems for performing the operation of dividing the pulse-width signals.

The purpose of the invention is to simplify the device.

Figures 1 and 2 show the block diagram of the device in the first embodiment and the time diagram of its operation; figure 3 and 4 is a block diagram of the device according to the second variant and the timing diagram of its work.

According to the first variant, the device 5 has the potential from the control V-input to the counter-generator of the reference frequency, 6 is removed (with

1 (this means in a longer time - 10 variable interval T is laid exactly

one time interval T); secondly, the element AND 2 is closed and the contents of the counter 5, equal to N T, fjj, is fixed; thirdly allowing

the first 2 and second 3 elements are AND, the element is NOT 4, the first 5 and second 6 counters, the trigger 7, the first 8 and second 9 elements OR, the result counter 10, the first 11 and second 12 information inputs of the device.

The specified device works as follows.

In the initial state of the circuit, all the counters 5.6 and 10 are in the zero position: the potential O from the second input 10 of the device is set-. Flax in position O on the installation R-input trigger 7.

I.

On the first and second information

the inputs of the device 11 and 12 are pulsed with durations corresponding to the time intervals T, and Tj, the ratio of which is required to be calculated (Figures 2a, 5). In this case, the inhibiting potential O from the R input of the trigger 7 is removed (this means that the first pulse, which arrives at the counting C input of the trigger from the overflow output of the counter 6, flips it to position 1, the second pulse returns to the position Oh, etc.). During T, counter 5 through element And 2 receives impulses of reference frequency f from the first output of generator 1 (FIG. 2 B), the contents of the counter increase and in the additional code are rewritten into counter 6, because the pulse with duration T is transmitted through RShI 8 (Figure 2h) is also fed to the control V-input of counter 6, allowing it to record information on the installation inputs. During the time of filling the counter 5, the element And 3 is closed with a prohibiting signal from the output of the element 4 (fig.2d) and the pulses of the reference frequency 2 fg sec.

25

N in additional code); fourthly, a high potential 1 is established at the output of the element HEA (Fig. 2A), the element And 3 is turned off and the pulses of the reference frequency 2 f from the second output of the generator 1 begin to flow to the counting input of the counter 6 (figure 2).

The contents of counter 6 are increased and at the moment of overflow (which occurs after time T from the moment the counter begins to fill with reference frequency pulses 2 f) a pulse with

    - 0

its P-output, fig.2e, first

throws trigger 7 tt It

35

40

in position

(FIG. 2), secondly, passes through the element OR 8 (FIG. 2O to the poisoning input of counter 6 and again allows entering into it the code equivalent N of the interval T, from counter 5. The pulses of the reference frequency 2 f from the second the output of generator 1 continues to flow to the counting input of counter b (Fig. 2d). At the time of the next overflow of this counter, the next pulse from its P input (Fig. 2e) returns trigger 7 to position O (Fig. 2g), and the pulse c The Q-output of the trigger passes through the element OR 9 (FIG. 2c) and is entered into the result counter 10 (this means that the The second time interval was placed in the Tg interval. The impulse from the P-output of counter 6 also passes through the element OR 8 (FIG. 2p to the control input of counter 6, allowing N to be entered into it from counter 5, etc. pos.

55 The sequence of operations is similar to that discussed above. The even pulses generated at the P output of counter 6 correspond to the sweep times ne50

the potential from the control V-input of the counter 6 is removed (with

N in additional code); fourthly, a high potential 1 is established at the output of the element HEA (Fig. 2A), the element And 3 is turned off and the pulses of the reference frequency 2 f from the second output of the generator 1 begin to flow to the counting input of the counter 6 (figure 2).

The contents of counter 6 are increased and at the moment of overflow (which occurs after time T from the moment the counter begins to fill with reference frequency pulses 2 f) a pulse with

    - 0

its P-output, fig.2e, first

throws trigger 7 tt It

in position

(FIG. 2), secondly, passes through the element OR 8 (FIG. 2O to the poisoning input of counter 6 and again allows entering into it the code equivalent N of the interval T, from counter 5. The pulses of the reference frequency 2 f from the second the output of generator 1 continues to flow to the counting input of counter b (Fig. 2d). At the time of the next overflow of this counter, the next pulse from its P input (Fig. 2e) returns trigger 7 to position O (Fig. 2g), and the pulse c The flip-flop Q output passes through the OR 9 element (FIG. 2c) and is entered into the result counter 10 (this means that The second time interval was placed in the Tg interval. The impulse from the P-output of counter 6 also passes through the element OR 8 (FIG. 2p to the control input of counter 6, allowing N to be entered into it from counter 5, etc. pos.

The sequence of operations is similar to that discussed above. The even pulses generated at the P output of counter 6 correspond to the sweep times ne

Riode T ((divisor) on the period T (divisible).

The calculation process ends at the point in time corresponding to the end of the time interval T,,

while at the second input i 2 of the device, a potential O is established (Fig. 28). The trigger 7 at this point in time may be in one of two possible positions. If the last pulse from the P-output of counter 6 is odd and the trigger, therefore, is in position 1, then the potential O from the second input of the device forcibly returns it to position-0 at the R-input, while the pulse from a single Q- trigger output is shorter in duration than T cut out pulse shaded in FIG. 2, is entered through the element OR 9 (FIG. 2 and) into the result counter. If the last pulse from the P-output of counter 6 is even and the trigger, therefore j, is in the O position, then the potential O from the second input of the device does not change (confirms) the indicated position of the trigger; the result in counter 10 is saved.

Thus, a device with a simple constructive implementation provides rounding of the result of calculations to the nearest integer value of the ratio,. The error of rounding in absolute value does not exceed 0.5 T,.

The device according to the second variant (FIG. 3) contains the generator 1 of the reference frequency, the first 2 and second 3 elements, the one-shot 4, the first 5 and the second 6 counters, the trigger 7, the first 8 and the second 9 elements OR, the result counter 10, the first II and second 12 information inputs of the device.

The specified device works in the following way.

The first P and second 12 inputs of the device are pulsed with durations corresponding to the time intervals T and T, the ratio of which is required to be calculated (Fig. AA,) In this case, the inhibitory potential O from the R input of trigger 7 is removed, allowing its operation in divider by two. During T, the counter 5 through the element And 2 receives impulses of the reference frequency fg from the first output of the generator 1 (figv). During this

the time interval is impulse from the first input of the device (Fig. 4o) 6 is blocked by the Reset input, therefore the reference frequency pulses 2 f from the second generator output 1, although passing through the And 3 element to the counting input of the specified counter (Fig.4-g) not counted by them.

At the moment of time, corresponding to the end of the first time interval, the element And 2 is closed and the arrival of the pulses of the reference frequency fg to the counter 5 is stopped, the blocking of the counter 6 is removed, the one-shot 4 generates a pulse (fig.4d), which first passes through an element of RShI 8. (FIG. 4O to the control input of counter 6 and allows entering the contents of the counter 5 into it (N T, f) in the additional code; secondly, it passes through the element OR 9 (FIG. 4o ) on the counting input of the counter 1 About the result and shares it with him (this means that in pain s time interval T ulozhils exactly one timeslot TS).

A further sequence. The operation sequence is similar to the sequence of operations for the device in the first embodiment. The content of the counter 6 begins to increase and at the moment of overflow the pulse from its P-output (FIG. 4e) flips the trigger 7 to position 1 (FIG. 4G), passes through the OR element 8 (FIG. 4p to the control input of the counter 6 and again permits N to be inserted into it in the additional code from counter 5. The pulses of the reference frequency 2 fg continue to flow to the counting input of counter 6 through the open element I 3. B. The next overflow of this counter is another pulse from its P-transceiver (Fig. 4e ) returns the trigger 7 to the position O (figure 4), and the pulse from the Q-output trigger and passes through the OR 9 element (Fig. 41 |) and is calculated by the result counter 10. This means that the second interval T is laid out in a longer time interval T (), the P1 pulse from the P output of the counter. 6, in addition, passes through the OR element 7 (FIG. 4p and allows N to be entered from counter 5 to counter 6 in an additional code, etc.

The calculation process ends at the time point corresponding to the end of the time interval Tj.

In this case, if the last pulse from the P-output of counter 6 is odd (trigger 7 is in position), then the potential O from the second input 2 of the device forcibly returns the trigger to position O from the R-input and the pulse from a single Q trigger input (shaded by Fig. 4g) is entered through the IL 9 element (Fig.) into the result counter. If the last pulse from the P-output of counter 6 is even and the trigger 7, therefore, is in the O position, then the potential O from the second input of the device does not change the specified position of the trigger and re-. the result in counter 10 is stored.

As in the previous case, the device provides for calculating the result of calculations to the nearest integer value of the ratio with an error not exceeding the absolute value of 0.5 T, and is characterized by a simpler constructive implementation.

Claims (2)

Invention Formula . A device for calculating the ratio of time intervals, comprising a reference frequency generator, the first and second outputs of which are connected respectively to the first inputs of the first and second elements AND, the second inputs of which are connected respectively to the first and second information-25 to the counting input of the result counter, device inputs, the element is NOT, the input of which is connected to the first information input of the device, and the output is to the third input of the second element I, the first counter j counts 40 input of which is connected to the output of the first element AND, and the outputs of the bits to the installation inputs of the second counter, the counting input of which is connected to the output of the second element I, and the output-45 to the counting input of the trigger and nepBoi-iy and a one-shot, the input of which is connected to the first information input of the device, and the output to the second inputs of the OR elements, characterized in that, for the purpose of ynponje-device, the reset input of the second counter is connected to the first information input of the device, and the setup input of the trigger is connected to the second digital input fy device. 60976 6 the input of the first OR element, the output of which is connected to the control input of setting the code of the second counter, and the second UTI element, the first input of which is connected to the trigger output, and the output to the counter input of the result counter, which, in order to simplify the device , the second inputs of the elements OR are connected to the first information input of the device, and the setup input of the trigger is connected to the second information input of the device. 2. A device for calculating a time ratio, comprising a reference frequency generator, the first and second outputs of which are connected respectively to the first inputs of the first and second elements AND, the second inputs of which are connected respectively to the first and second information inputs of the device, the first counter, the counting input which is connected to the output of the first element And 5 and the outputs of the bits - to the installation inputs of the second counter, the counting input of which is connected to the output of the second element And, and the output to the counting input of the trigger and the first input 0 of the first OR element, the output of which is connected to the control input of the second counter code, the second element OR, the first input of which is connected to the trigger output, and the one-one output, the input of which is connected to the first information input of the device, and the output to the second inputs of the OR, characterized in that, for the purpose of the ynponje device, the reset input of the second counter is connected to the first information input of the device, and the setup input of the trigger is connected to the second informational fy input of the device. 1 FIG. 2