SU744936A1 - Pulse shaper - Google Patents

Description

I

The invention relates to a pulse technique and can be used in generators of regular or code pulse signals for generating single pulses, a series of pulses, or single code pulses.

Known driver single pulses and series I, containing triggers, elements AND NOT and inverters. However, this driver has a complex structure, contains a large number of elements and as a result, it does not have sufficiently high reliability.

The closest technical solution to the invention is a device 2 comprising a trigger with separate inputs, a bipolar switch, two coincidence elements and a trigger with a counting input. However, this device generates only single pulses from the pulse sequence, arriving at the input bus.

At the same time, in many practical cases, besides single pulses, the formation of single series of pulses is required (for example, when checking counting and recording devices) or

code parcels (for example, when checking digital devices with binary codes). The purpose of the present invention is to extend the functionality by controlling the number of pulses in a single 5 series.

The goal is achieved by the fact that a pulse shaper containing a trigger with separate start, the inputs of which are connected to a bipolar switch; and the output - to the trigger with a counting input, and the element of coincidence, entered the D-trigger, the element OR, and the double element OR-NOT. In this case, the information input-flip-flop is connected to the trigger output with the counting input, the forward output is connected to the first input of the coincidence element, and the inverse is connected to the trigger setup input with the counting input. The output of the OR element is connected to the clock input of the V-trigger, and the first input is connected to the clock bus. The first output of the item is OR NOT connected

20 with the second input of the OR element and the second input of the coincidence element, the second output with the third input of the coincidence element, the inputs with buses of control signals and clock pulses. The fourth input of the match element is connected to the input code sequence bus.

The drawing shows a block diagram of the device.

The shaper contains a bipolar switch 1, trigger 2 with separate start, trigger 3 with a counting input, D-flip-flop 4, element OR 5, element ORINE 6, element 7 coincidence, bus sync pulses 8, control signals of the 9 series mode, clock signals 10, the control signals of the mode of single pulses 11, the input code sequence 12.

The device works in the following way.

In the initial state, the switch 1 (the start button) is in the position a, the level of the trigger 2 and the direct outputs of the triggers 3 and 4 (0) is set to "1, the coincidence element 7 is closed and no output pulses.

The circuit is prepared for operation by switch 1. After switching it to

Operation mode

The position of the b (start button pressed) signal, arriving from the output of trigger 2 to the input of trigger 3, sets at its output and the D input of the trigger 4 level “O. This level is rewritten to the output of the trigger 4 either by a sync pulse arriving on the bus 8, or by a clock pulse received by it on the bus 10 (depending on the set operating mode). The level “O from the output of trigger 4 opens element 7 of coincidences and allows passage of the generated signal to the output of the device, and the unit level from the other output of trigger 4 enters the input of trigger 3 and again sets the output level to“ 1. Thus, the scheme is prepared for work.

The scheme works in three modes: the formation of single pulses; the formation of a series of pulses; formation of a single code signal,

The operation of the EJO device of all modes is explained by a state table.

Logic levels in the world 891112

The formation of any desired signal occurs after pressing the start button (switch 1) and sending control and information signals in accordance with the table.

In the single pulse shaping mode, the first clock pulse after pressing the start button (switch 1 is set to b) from the iO bus via the OR-NOT b element and the OR 5 element enters the clocked inputB-trigger 4, rewriting the level "O from input II to output and thus opening element 7 matches. At the same time, the level “1 from the output of the trigger 4 arrives at the installation input of the trigger 3 and sets the output level to“ 1.

The second clock pulse through the open element 7 matches is fed to the output of the device, and also rewrites the level "1 from the input of the D-flip-flop 4 to the output, again closing the element matches. All subsequent pulses cannot pass to the output of the device, since the coincidence element will remain closed until then. until the start button is pressed again (the switch If and - the whole process does not repeat.

In the pulse train mode, the trigger 4 is affected by the clock pulses delivered to the bus 8. The first clock pulse opens the coincidence element 7 and the clock pulses begin to arrive at the device output, the number of which (the run length) is determined by the time relationship between clock pulse repetition periods T and clock sync pulse G and is equal to D. The second ctTHx impulse again closes the element of coincidence and brings the circuit to the initial state n-ke.

in the mode of forming single-time code signals, the clock pulses do not arrive at trigger 4 and element 7 of the match-up, since the OR-NOT 6 element is closed. Bus 12 receives a signal in the form of a pseudo-random sequence; the millions of code words, the repetition period of which is equal to the Tc sync pulse repetition interval, the code signal (one period) is present at the device output between the next two sync pulses, after which the circuit returns to its initial state before the start button is pressed again (switch 1).

The introduction of a D-flip-flop, an OR element, and an OR-NE element into the circuit thus allows the functionality and scope of the known device to be expanded by forming not only single pulses, but also a series of pulse signals and one-time code messages.

Claims (2)

1. USSR author's certificate number 570189, cl. H 03 K 3/78, 1976. 2. USSR author's certificate number 526063, cl. H 03 K 3/84, 1974. D With eight 0