SU711679A2 - Arrangement for shaping differential frequency pulses - Google Patents

Description

one

The invention relates to the field of automation and computer technology and can be used in digital devices for various purposes, such as electronic digital computers, digital measuring instruments, digital converters.

A device for generating differential frequency pulses according to the main author's certificate No. 391729, contains input and output triggers, two AND elements, a delay element, a driver, a high frequency pulse bus, and a low frequency pulse bus 1).

A disadvantage of the known device is that it can lose low frequency pulses in the case of coincidence of a high frequency pulse and a low frequency pulse if the value of one of the low frequency pulse periods is less than or equal to the high frequency pulse period. This disadvantage may result in a decrease in the accuracy of the formation of differential frequency pulses.

The purpose of the proposed invention is to improve the accuracy of the device by eliminating the loss of low-frequency pulses with non-synchronous arrival of high and low frequency pulses.

The goal is achieved by the fact that in ycTpojiCTBo according to the author's certificate No. 391729, containing the input trigger, the first output of which is connected to the first input of the And element, the second input of which is connected to the first input of the input trigger and to the output of the delay line, an additional trigger, additional element And pulse generator, the input of which is connected to the second output of the trigger, and the output to the first input of the additional trigger, the second input of which is connected to the low-frequency pulse bus, and the output through the additional element t I - with the second input of the trigger input, the second input of the additional element I is connected to the input of the delay line and the high frequency pulse bus; additional input of the trigger trigger and four AND elements are introduced, and the low frequency pulse bus is connected through the first element I to the second input of the input trigger, and through the second element I with the first input of an additional input trigger, the high-frequency pulse bus is connected to the third input of the output trigger through the third element I, the second input of which is connected with the output of of the pilot input trigger, the output of the imager is connected to the second input of the additional input trigger through the fourth element I, the second input of which is connected to the third input of the third element I, to the second input of the first element I and the second input of the second element I connected to the first output trigger input.

The drawing shows the functional scheme of the proposed device.

The device contains triggers 1, 2, 3, And 4, 5, 6, 7, 8, 9 elements, delay element 10, driver 11, output 12, high frequency pulse bus 13, low frequency pulse bus 14.

The device works as follows. In the initial state, the triggers I, 2, 3 are in the state O, while the elements AND 4, 5, 7, 8 are closed, and the elements AND 6, 9 are open. When a low frequency pulse is emitted, the first high frequency pulse delayed by the delay element 10 will set the trigger 2 to state 1. The AND element 5, which can be executed, for example, in the form of a potential-potential coincidence circuit, opens and each high-frequency pulse passes from a range of 13 high-frequency pulses through element 5 and to output 12 of the device. With the appearance of a pulse on the bus 14 of low-purity pulses, trigger 1 is set to state 1, and element 4 And opens, and element 6 And closes. The next high-frequency pulse passes through element 4 I and sets trigger 2 to state O. At the output of pulse generator 11, an impulse is generated that sets state O to trigger 1, which leads to opening element 6 AND and closing of element 4 I. Due to the fact that the trigger 2 is set to the state O, the element 5 is closed, the high-frequency pulse delayed by the delay element 10 does not pass to the output 12 of the device, but only sets the trigger 2 to the state 1.

If the delay time of the high-frequency pulse relative to the low-frequency pulse is shorter than the transition time of element 4 to the open state, then the output of element 4 I will generate a signal that does not set to the state O trigger 2. In this case, the installation to the state O trigger 2 occurs when post-n the next high frequency pulse.

If during the operation of the device, the period of the pulse of low frequency changes and its length | at some intervals is shorter. or equal to the transmission of high frequency pulses, it is possible that pulses are simultaneously received at untHy 13 high frequency pulses and

bus 14 pulses low frequency. Therefore, in this case, it may be that the pulse at the output of the driver 11 is formed at the moment when the next low-frequency pulse arrives on the bus 14

low frequency pulse. The elimination of the low-frequency pulse loss is accomplished with the help of trigger 3 and the elements 6, 7, 8, 9 I. This happens as follows.

If at the time of formation of a pulse on

the output of the driver AND receives a pulse to the pulse 14 low-frequency pulses, the latter at the second input of the trigger 1 does not pass because element b is still closed, and passes to the first input of the trigger 3 through element 7 and since it was opened by the potential from the first output of the trigger 1. At the same time, trigger 3 will be set to state 1 and will prepare element 8 I for opening.

After the pulse arrives from the output of the driver And, the trigger I will be set to the state O, which will lead to the opening of elements 6, 8, 9 and the closing of the elements 4, 7 I. Another pulse in the high frequency from the current 13 high-frequency pulses proceeds through element 8 AND

and sets the trigger 2 to the state O, as a result of which this high-frequency pulse does not pass to the output 2 of the device. The impulse generated at the output of the imaging unit 11, in turn, enters through the open element 9 and to the second input of the trigger 3 and sets it to the state O.

If one of the periods of low frequency pulses is less than the high frequency pulse period,

then state 1 will be set first trigger 1, and then through the open element 7 and trigger 3. In this case, the elements 6, 8, 9 And will be closed, so the next high frequency passes through the element 4 And on

the second input of the trigger 2, and through the element 8 And does not pass. The impulse generated in this case at the output of the imaging unit 11, will establish the trigger 1 in the state O. The arrival of the impulse from the output of the imaging device 11 to the second input

Claims (2)

trigger 3 is prohibited because element 9 is closed by the potential from the second output of trigger 1. After being set to state O of trigger 1, the next high frequency pulse passes through the element 8 and to the third input of trigger 2, which prohibits the passage of a high frequency pulse on output 12 of the device. Thus, the introduction of trigger 3 and elements 6, 7, 8, 9 and provides intermediate memorization of a single low frequency pulse if before the end of the processing of the previous low frequency pulse n setting trigger 1 in the state O to the bus 14 low frequency pulses received another impulse. This eliminates the loss of a low-frequency pulse if the length (The length of one of the low-frequency pulse periods is less than or equal to the length of the high-frequency pulse follow-up period when the high-frequency and low-frequency pulses receive asynchronously. In this connection, the accuracy of the formation of differential pulses frequency output device 12. The proposed device can be used even if the duration of several successive periods of low frequency pulses, eg Measuring two is greater than or equal to the period of high frequency pulses. To do this, another additional trigger and three elements I. must be connected to trigger 3. Connect the newly introduced trigger and three elements AND to trigger 3 and trigger 2 are similar to the trigger connections. 3 n elements 7, 8, 9 And with trigger i and trigger 2. The invention of the Device for the Forms of the Difference Frequency Pulses according to the Author's Certificate No. 391729, characterized in that, from the price of work, an additional trigger and four elements I were inserted into the low frequency pulse of your low frequency pulses are connected through the first element And with the second input of the trigger input, and through the second element And with the first input of the additional input trigger, the high frequency pulse is connected to the third input of the output trigger through the third element And, the second input connected to the output of the additional input trigger, the output of the driver is connected to the second input of the additional input trigger via the fourth element M, the second input of which is connected to the third input of the third element I, to the second input of the first element I and to the second input of the second trigger element And is connected to the first output of the trigger input. Sources. Attitudes of attention for examination 1. Copyright wedding USSR № 391729, CL, H 03 K 13/20, 1971.