SU1193818A1 - Number-to-time interval converter - Google Patents

Description

The invention relates to a pulse technique and can be used in control systems with digital information processing.

The aim of the invention is to improve the accuracy.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 shows an example of execution of a pulse distributor circuit; in fig. 3 timing charts of the device.

The Converter contains a pulse generator 1, the output of which is connected through element 2 and with the counting input of the first counter 3, the installation inputs of which are connected to the input buses 4. The output of the first trigger 5 is connected to the second input of the element 2. The outputs of the distributor 6 pulses are connected to the output of the pulse generator 1 and bus 7 control, and the outputs are respectively connected to the first input of the first trigger 5, the recording inputs of the first counter 3 pulses and the second counter 8 pulses, the first input of the element OR 9 and the second input of the first rigger 5. The second input element OR 9 is connected to the output element And 2, and the output is connected to the counting input of the second counter 8, the installation inputs of which are connected to the input buses through the block 10 of inverters 4. The outputs of the counters 3 and 8 are connected to the inputs of the second trigger 11, the output of which is the output bus 12.

The distributor 6 pulses (Fig. 2) contains a B-flip-flop 13, *

2

ment And 14, the pulse counter 15 and the decoder 16.δ-input-trigger 13 is the first input of the distributor 6 pulses _t Ώ-input 39-flip-flop 13

5 is integrated with the reset counter ”input - ka 15 and connected to the inverse output 3? -trigger 13, the direct input of which is connected to the first input of the element And 14, the second input ko10. Some- another is the second output of the pulse distributor 6, and the output is connected to the counting input of the counter 15. The outputs of which are respectively connected to the information inputs de, 5 of the encoder 16, the synchronization input of which is connected to the output of the And 14 element, and the outputs are the corresponding outputs 6.1, 6.2 , 6.3, 6.4 of the distributor 6 pulses, while

20 output 6.4 is connected to the C-input of the O-flip-flop 13.

The Converter operates as follows.

The signal arriving at the pressure bus 7 in the pressure pack (Fig. 3b) starts up the distributor 6 pulses. In the initial state, the counter 15 of the distributor 6 pulses is in the zero state, since at its inlet of zeroing (8-input) there is a single potential coming from the inverse output of the 3? -Trigger 13, and the And 14 element is closed by zero potential from the direct output Ί) -trigger 13. The signal arriving at the control bus 7 sets the ϋ-trigger 13 of the distributor 6 pulses? single state. In this case, a sequence of pulses with sec 3 11

first output of the generator 1 pulses (Fig. Over) through the element And 14 is fed to the counting input of the counter 15

and. the input edge of the decoder 16. On the trailing edge of each counting pulse received at the counting input of counter 15, its content increases by one, and an impulse is formed at the corresponding output of the decoder 16 with a single potential at its input of gating. The pulse from the fourth output of the decoder 16 sets!) The trigger 13 to the zero state, and the passage of the sequence of pulses through the element I14 of the distributor 6 pulses stops. The single potential from the inverse output!) - the trigger 13 sets the counter 15 to the initial zero state, and the operation of the distributor 6 pulses ends. Thus, after applying four control pulses, the distributor 6 pulses returns to its original state.

The first pulse of the pulse distributor 6 (fig. 3β) from output 6.1 sets the first trigger 5 to zero (fig. Зж). '

The number code, fed to the input buses 4, goes to the installation inputs of the counter 3 and through the inverter unit 10 to the installation inputs of the counter 8. The signal of the second pulse (Fig. Zg) of the pulse distributor 6, which goes to the recording inputs of counters 3 and 8 from the output 6.2, in the counter 3 the direct code is written, and in the counter 8 - the return code of this number. The third pulse of the distributor 6 pulses (Fig. 3 <|) through the element OR 9 is fed to the counting input of the second counter 8 and from the written back code it forms an additional code of the number. The fourth pulse of the pulse distributor 6 (FIG. 3) sets the first trigger 5 (FIG. 3) to one state, and the output pulses of the pulse generator 1 begin to flow to the counting inputs of the counters.

18 <

3 and 8. By overflow signal of the first counter 3, the second trigger 11 is set to one state, and by the overflow signal of the second counter 8, the trigger 11 is set to the zero state. Thus, a rectangular pulse is formed on the output bus 12, the duration of which corresponds to the number code supplied to the input buses 4.

Due to the fact that the counters 3 and 8 have an equal number of digits and are identical to each other, the switching time of the counter elements and its change in a wide range of temperatures and from aging at both counters are the same and, therefore, do not affect the duration of the time interval 6 ^ generated at the output of the second trigger 11 (FIG. 3A). In the known device, the error £, determined by the switching time of the counter, is introduced into the duration of the time interval.

In addition, high speed requirements are not imposed on the converter elements, since the errors from the switching time of the element-paths forming the beginning and end of the time interval are mutually compensated. When the code changes, the output signal length changes symmetrically relative to its middle, and since the transfer pulse generation sequence in counters 3 and 8 is determined by the code value, a time interval is periodically generated on the output bus 12, the duration of which is - = 2ΝΤ- _Γ , where N is the input code ; T _g - period of the pulse generator 1.

At that, the positive values of the input values are represented in the direct code with the highest (sign) digit equal to "1", the negative values of the input values are represented in the additional code with the highest (sign) digit equal to "zero ' ¹ .

1193818

FIG. 2

have penetrated

Claims (2)

1. CONVERTER CODE DURING TIME INTERVAL, containing a pulse generator, the first output of which is connected to the first input of the element I, the output of which is connected to the counting input of the first pulse counter, the installation inputs of which are the corresponding input buses, and the first trigger, the output of which is connected to the second input element I, about tl and h and y and i with the fact that, in order to improve accuracy, the element OR, block of inverters, the second trigger, the second pulse counter and pulse distributor, the first and second inputs of which are respectively connected to the control bus and the second output. pulse generator, the first output is connected to the first input of the first trigger, the second output to the recording inputs of the first and second pulse counters, the third output to the first input of the OR element, and the fourth output to the second input of the first trigger, the second input of the OR element with the output element And, and the output with the counting input of the second pulse counter, the installation inputs of which are connected to the corresponding outputs of the inverter unit, the inputs of which are combined with the corresponding installation inputs of the first pulse counter s, and an output connected to a first input of the second flip-flop, a second input connected to the output of the first pulse counter, and the output is an output bus. zi 1193818 > 1193818 2. Converter pop.), Characterized in that the pulse distributor is made on the element And, the pulse counter, the decoder and I) -trigger, 5-input of which is the first input of the distributor, and!) - the input is combined with the input of the reset of the pulse counter and connected to the inverse output 3) -trigger, the direct output of which is connected to the first input of the element And, the second an input ^- a second input of the pulse distributor, and the output is connected to the count input of the pulse counter, the outputs of which are respectively connected to data inputs of a decoder whose clock input connected to the output of the AND, and the outputs are the corresponding pulse distributor outputs, a fourth output is connected to the C -An input of the 37 flip-flop. one