SU1012429A1 - Automatic threshold device - Google Patents

Abstract

AUTOMATIC THRESHOLD DEVICE, containing a mold, the input of which is connected to the input terminal, and an output to the input of the address counter set to Zero and an input of the generator, whose input is connected to the calculator’s counting input, the memory unit of thresholds, the address inputs of which are connected to the counter outputs addresses, and the output with the first input of the element I, in which the input is a connection with the input of the device, characterized in that, in order to extend the functionality by checking the authenticity of the Control, a block n is entered into it accumulations, buffer memory block, pulse shaper, trailing edge former, counter, shift register, trigger, wggt py-. ;; ..:, “.,.,.,. , „I -..-. -And .; -Q 45j S iVii - (V-Siii- :. ", rtv -j, J: ,,; №Ь; l /.,;., 4th SaBjiKl vyc.;.;. I -.f | x) th and the third elements And, while the output of the counter. address is connected to the address inputs of the storage unit, the buffer storage unit, the first input of the storage unit is connected to the output of the trailing edge generator, the information input to the recording input of the buffer storage unit and with the inverse trigger output, the second input through the third element I is connected to the output of the generator and the first input of the second element I, the outputs inverse through the second element, and direct directly connected to the counter inputs, the output of which 9 is connected to the input of the pulse former and the shift register; the output of the pulse former is connected to the information input (F of the buffer memory block whose output is connected to the information input of the threshold memory block whose entry input is connected to the second the input of the third element is And and the trigger output, the information input of which is soy | Odinen with the output of the shift register, and 4ib The synchronization input is with the second input of the shift register and the output of the device, and the device input is connected En to the entrance of the front edge former and the counter.

Description

The invention relates to a pulse technique and can be used in the processing and display systems of measurement information, in devices for statistical analysis of the structures of pulse flows. A device for selecting pulses is known, comprising a coincidence element, the output of which is the output of the selector, and a delay device connected between the inputs of the coincidence element. This device generates an output signal in case the signal delay in the delay device is less than the duration of the input pulse 1J; However, if it is necessary to process multi-position signals, the use of this device increases the equipment costs, since it must then have several threshold levels. In addition, in the case of a change in the scale of the input signal towards longer or shorter durations while maintaining the number of positions, the processing of the signal selectors becomes impossible without manual adjustment of the threshold levels. Closest to the proposed is a threshold device in duration, containing a differentiating circuit, the output of which is connected to the input of the installation in O of the address counter and to the control input of the generator, the output of which is connected to the counting input of the counter, the storage device, the address inputs of which are connected to the output of the counter ka, and an information input with a single pulse impulseJ circuit I, the first input of which is connected to the output of the charger, and the second one - to the input of the differentiating circuit and to the input of the selector 2. second devices is that the processing of real measurement signals necessary to adjust the threshold levels during operation. This is due to the fact that a noise signal and noise of various intensity are imposed on the measuring signal in the communication channel, which narrows the zone of confident signal detection, and the noise is unevenly distributed over time. In addition, when working from different signal sources, as well as due to instability of the signal former 9 in the direction of shorter or longer durations while maintaining the number of zones, the device requires manual correction of threshold levels, which is not always possible, for example, with a transmission cycle of no more than a few seconds. The task of continuous correction of threshold levels in the processing of information, especially short messages, can be solved only by an automatic threshold device. The purpose of the invention is to expand the functionality of the device by increasing the reliability of the control. This goal is achieved by the fact that the device containing the driver, whose input is connected to the input terminal, and the output to the input of the zero address address counter and the generator input, the output of which is connected to the counting input of the counter, the threshold memory unit, the address inputs connected to the output an address counter and an output to the first input of the AND element, the second input of which is connected to the device input, an accumulation memory block, a buffer memory block, an impulse shaper, a front current shaper, a counter, a shift register , trigger, second and third elements And, while the output of the address counter is dinine with the address inputs of the accumulation memory block and the buffer memory block, the first recording input of the accumulation memory block is connected to the output of the falling edge driver, the information input with the recording input of the buffer block Memory and inverse trigger output, the second recording input through the third element I is connected to the output of the generator and the first input of the second element .. And, the outputs are inverse through the second element I, and the direct is directly connected to the inputs of the counter, output is connected to the input of the pulse generator and the shift register, the output of the pulse generator is connected to the information input of the buffer memory block, the output of which is connected to the information input of the threshold memory block, the recording input of which is connected to the second input of the third element And the trigger output, which information input connected to the output of the shift register, and the synchronization input is connected to the second input of the shift register and the output of the imaging device, and the input of the device is connected to the input of the imaging machine of the falling front and the counter.

On fmg. 1 given a block diagram of the device; in fig. 2 - diagrams of input signals; Fig. 3 timing diagram of the device. Automatic threshold threshold (eoystvo (figure 1 contains a driver 1, the input of which is connected to the input of the device, and the output is connected to the installation input. Zero of the address counter 2 and the input of the generator 3, the output is connected to the counter input of the counter 2, block control thresholds 4, the address inputs of which are connected to the outputs of the address counter 2, and the output to the first input of the element 5 and the second input of which is connected to the input of the device, the memory block коп 6, the address inputs of which are stored with the address inputs of the threshold memory block k, buffer memory block 7V od The rear processor is 8, the input of which is connected to the input of the device, and the output to the first input of the memory block of the accumulation | 1 and 6, the counter E, the counting input of which is connected to the output of the second element 10, the driver of a single output 11, and the first the input to the zero of the counter 9 is connected to the output of the storage unit 6, and the second input of the zeroing of the counter 9 to the input of the former 1, the input of which is connected to the input of the installation in 1 of the shift register 12 and the trigger synchronization input 13, the second element | And 10 , the first entry KOtoporp connect | Inverted output of storage unit 6, the second input - with the first input of the third element And | And with the output of generator 3, the output of the third element And 1 is connected to the Secondary input of the storage unit 6, the output of counter 9 is connected to the input synchronization regis. of shift 12 and through the shaper of a single pulse 11 with information input of the block of buffer memory 7 "whose output is connected to the information input of the memory block of thresholds k, trigger 13, information input of which is connected to the output of shift register 12, output | Trigger 13 with single with recording entry

The storage device of the thresholds and, the second input of the third element It, the inverse output of the trigger 13 connect, is not connected with the recording input of the buffer memory block 5 and with the information input of the memory storage 6.

The automatic threshold device works as follows. Shaper 1 forward

0 to the front of the input signal are formed: the pulses are set to the zero state; the counter of the address 2 and the generator 3 stop. "At the end of these pulses, the counter is filled with 2 clock pulses of the generator 3- The period of the pulses of the generator 3 is selected based on the specified selection precision and the number of bits The address counter 2 is selected in the KIM manner. So that the interval of filling of the counter 2 does not exceed the period of following the input signals. Thus, each clock pulse interval of the generator 3 corresponds to: vuet. a certain state of the counter 2, which is the address of the dth clock interval in the binary code. At the generated address, the address is made to the memory block 4, 6 and 7 of the memory).

0

All three memory blocks are one-bit and have a capacity equal to the capacity of the address counter 2. The threshold values of the lower levels corresponding to the selection zones t .... tg are threshold

 the levels are located between the boundaries of the selection zones, within the interval O-ti ,, ... .. (Fig. 2) are read into the; Operation process from the memory block i and through the And 5 element in the presence of the input signal ria the second input goes to the output of the device . In this case, the number of output pulses corresponds to the number of the selection zone, for example, if the input signal has

 the duration t, then the output of the device, the device will be Three pulses (Fig.27. if ty - at the output of the element And 5 pulses.

The values of the threshold levels in the memory block f are continuously adjusted to track the change of the scale of the input signal. The formation and entry of threshold levels into the memory block k is performed as follows: on the falling edge of the input signal, allocated by the driver 8, in the memory block 6 it records | with 1 at the address coming from the estimator 2 and the corresponding end of the input signal. The recording process goes on continuously, and after passing the input pulses containing all possible positions in duration, in memory 6. TV addresses are recorded at the addresses corresponding to the end of the input signals, and O are recorded for the rest. Content of memory block 6 (sequentially by addresses) for the n code code is shown in fig.Za. Reading from the memory block is performed simultaneously with writing to it (the output is not blocked when writing, so the recorded information immediately appears on the output): as the address code of memory block 6 increases, logical 1 second. its output is input to the installation in O of the counter 9 and the signals from the inbers output of block 6, probed by pulses from the generator 3 to the element | TI 10, - to the counting input of the counter 9. Counter 9 after recalculation of the series of pulses is set O. in O. The conversion factor of the counter 9 is chosen so that its time is longer than the maximum possible variation in the duration of the input signal from the nominal value, but no more than the minimum possible duration of the signal position. From Fig. 36, where the temporary operation of counter 9 is shown, it can be seen that the temporary position of the positive and n repressions at the output of the counter 9 corresponds to the specified position of the threshold levels (between the borders of the input signal positions in FIG. 3a). On the positive front of the output signals, 4ik 9 9 Pulse Forming 11 generates a single pulse, which is fed to the information input of block 1, preprogrammed for temporarily storing the thresholds until they receive a Signal about them. authenticity. Confidence signals are designed to increase the reliability of the device and are formed on shift register 12 and trigger 13. On the leading edge of the input signal allocated by shaper 1, the contents of shift register are entered into confidence trigger 13, AND the shift register is set to 1. Upon subsequent reading from the memory block ti 6 counter pulses 9. advance 1 on shift register 12. In the next clock cycle of the input signal, if the number of register shifts is equal to 12. The number of selections (the number of thresholds) in the trigger of validity 13 is written 1i. At the same time, the recording of the thresholds from block 7 to block A is stopped by the counter 9 in the buffer memory block 7 Oro. At the same time, 1 is removed from the information input of the memory block 6, and the second entry of the record of this block is transmitted through the And 1 element in the write mode O at all addresses, clearing the memory block). In the next input signal cycle, a new accumulation block 6 information accumulation cycle begins, analyzing its contents and generating new thresholds until the validity trigger is set to 1. Thus, the proposed automatic threshold device allows for the processing of MHohops) signals, does not require pre-tuning and adjustment, and is a device suitable for signal selection during short sessions of communication, as well as in the case of a change in the scale of the input signal in belt.

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Claims (1)

'<AUTOMATIC THRESHOLD DEVICE, containing a driver whose input is connected to the input terminal and the output to the input mustache. zero the address counter and, the input of the generator, the output of which is connected to the counter input of the counter ”is a threshold memory unit whose address inputs are connected to the outputs of the address counter, and the output is with the first input of the element And, the second input of which is connected to the input of the device, that, in order to expand the functionality by increasing the reliability of control, an accumulation memory block, a buffer memory block, a pulse shaper, a trailing edge shaper, a counter, a shift register, a trigger, and a second are introduced into it the third and third elements And, while the output of the address counter is connected to the address inputs of the accumulation memory block, the buffer memory block, the first record input of the accumulation memory block is connected to the output of the trailing edge former, the information input is the record input of the buffer memory block and the inverse trigger output , the second input of the record through the third element And is connected to the output of the generator and the first input of the second element And, the outputs are inverse through the second element And, and the line is directly connected to the inputs of the counter, the output of which is connected to the input of the pulse former and the shift register, the output of the pulse former is connected to the information input of the buffer memory unit, the output of which is connected to the information input of the threshold memory unit, the recording input of which is connected to the second input of the third AND element and the output of the trigger, the information input of which is connected with the output of the shift register, and the synchronization input with the second input of the Shift register and the output of the shaper, and the input of the device is connected to the input of the shaper of the falling edge and counter.