SU1272488A1 - Device for determining moments of extrema occurence - Google Patents

Description

The invention relates to analog digital computer technology, can be used in digital computing machines, digital electrical measuring instruments, automation devices for converting analog information into digital form.

The purpose of the invention is to increase reliability in operation.

Fig, 1 shows a block diagram of the device; Fig. 2 shows timing diagrams explaining the operation of the device.

The device consists of the first 1 and second 2 comparison blocks, the converter 3 code — voltage, AND 4 elements, shift register 5, reversible counter 6 pulses, differentiation unit 7, zero-body 8 of the first 9 and second 10 coincident elements, and trigger 11, moreover, the input signal is connected to the first inputs of the comparison units 1 and 2 and to the input of the differentiation unit 7. The outputs of blocks 1 and 2 of the comparison are respectively connected to the inputs of the addition and subtraction of the reversible counter of 6 pulses, the outputs of which are serially connected to the inputs of the converter 3 code - voltage and through the elements 4 and 4 of the inputs of the shift register 5, the output of which is the digital output of the device The first and second outputs of the converter 3 code-voltage, differing by one quantization level, are connected to the second inputs of the comparison units 1 and 2, and the output of the differentiation unit 7 is connected to the input of the zero-body 8, whose output connected to the inputs of the elements 9 and 10, the matches and the outputs are the outputs of the device. The inputs of the trigger 11 are connected to the outputs of blocks 1 and 2 of coincidence, and the direct and inverse outputs of the trigger 11 are connected respectively to the inputs of the first and second elements 9 and 10 of coincidence, with the output of the zero organ 8 connected to the second inputs of the And 4 elements

The device works as follows.

The input signal (Fig. 2a, curve 1 is fed to the first inputs of comparison blocks 1 and 2, the response levels of which differ by one quantization level. If the input signal reaches the comparison level of the comparison block 1 as it increases, a pulse appears at the output of this block ( Fig. 26), which increases by one the number in the reversible counter of pulses 6 and sets a high logic level signal at the first output of trigger 11 (Fig. 2d), indicating a tendency of the function to a maximum. An increase by one number in the reverse counter ke 6 pulses leads to an increase in one level of quantization of the output voltage of the converter; code 3 - voltage, and hence the levels

5 of the operation of both blocks 1 and 2 of the comparison (Fig. 2a, curves 2 and 3). With a further increase in the input signal, the indicated operation of the device is repeated, and at the first output

0 flip-flop 11 maintains a high logic level signal (FIG. 2g), and the output signal of differentiation unit 7 repeats the input signal, taking into account the transfer characteristic

5 of this block, therefore, the extremum of the input signal coincides in time with the transition of the output signal of block 7 of differentiation through zero, as it carries out the shift

0 phase of the output signal (derivative) relative to the input on / 2,

At the moment of transition of the derivative through zero, i.e. at the moment when the input signal reaches an extremum, a pulse (Fig. 2e) is generated at the output of the zero-organ 8, which, due to the presence of a high logic level signal at the first input of the element 9, passes to the output of this element (4mg 2g) and indicates that the input signal reaches maximum. The same pulse arrives at the first inputs of the And 4 elements and allows the codogram to pass from the output of the reversing counter 6 pulses to the input of the register 5.

When the input signal passes an extreme value and decreases its amplitude by one quantization level, a pulse arises at the output of comparison block 2 (Fig. 2c), which is fed to the subtracter input of the reversible counter 6 pulses and to the second input of trigger 11. At that, from the reverse the pulse counter 6 subtracts one pulse, and the trigger 11 switches (Fig. 2e). At the same time, the supports are shifted

a single voltage for one quantization step, etc. When the input signal reaches the minimum, the device operates in the same way as described with the only difference that the pulse indicating the extremum now appears at the output of the coincidence element 10 (Fig. 2h), which indicates the minimum of the function.

Claims (1)

Invention Formula A device for determining the moment of occurrence of extrema containing the first and second comparison blocks, the code-voltage converter, AND elements, shift register, reversible pulse counter, differentiation unit, zero-body, first and second coincidence elements, the first inputs of the comparison blocks and input differentiation unit connected. to the input bus, and the outputs of the comparison units are respectively connected to 24884 The inputs for the addition and subtraction of a reversible pulse counter, the outputs of which are serially connected to the converter inputs, voltage code, and, via I elements, to the inputs of the shift register, whose output is the digital output of the device, and the first and second code converter outputs voltage. respectively connected to the second inputs of the comparison units, the output of the differentiation unit connected to the input of the null organ, the output of which is connected to the first inputs of the coincidence elements, and their outputs are device outputs from In order to increase reliability in operation, a trigger is inserted into it, to the inputs of which the outputs of the matching blocks are connected, and to the direct and inverse outputs - the second inputs of the first and second elements, respectively, the output of the zero-organ being connected to the second 5 inputs of elements And,