SU1672475A1 - Device to determine extremums - Google Patents

Abstract

The invention relates to computing and can be used in information processing systems. The purpose of the invention is to improve accuracy. It is achieved due to simultaneous, rather than sequential, fixation of changes in the signal under study in two channels — revealing the maximum and minimum. In this case, the error associated with the time quantization is determined only by the speed of the analog-digital converter. 1 il.

Description

The invention relates to computing and can be used in information processing systems.

The purpose of the invention is to improve accuracy.

The drawing shows a block diagram of the device.

It contains the first 1 and second 2 blocks of comparison, the first 3, second 4, third 5 and fourth 6 registers, analog-to-digital converter (ADC) 7, generator 8 clock pulses, block 9 set intervals, decoder 10, counter 11. element AND 12, the trigger 13, the output 14 of the maximum value, the output 15 of the minimum value, the outputs 16, 17 of the indication of the moments of occurrence of extremes.

The device works as follows.

The signal under study is fed to the input of the A / D converter 7 and, at clock points in time, the generator 8 begins digitizing it. At the initial time point the signal generated at the output of block 9, the trigger 13 is set to one. As a result, at the second input of the element 12, a voltage level of logical 1 is set and the first pulse from the output of the generator 8 passes to the output of the element 12 and sets the counter 11 to the initial zero state. At the end of the pulse, the trigger 13 returns to the zero state, prohibiting the reset of the counter 11 to the zero state until the beginning of the next time interval

Upon completion of the conversion of the signal under study, the digital output of the ADC 7 is set to the digital equivalent of the input signal to be converted at the information output, and the signal for the end of the conversion is generated at the output of the READY. Under the influence of this signal, a signal is generated at the output of the decoder 10 that provides a record in the registers 3 4 of the first reference of the signal being studied,

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The second pulse of the generator 8 switches the counter 11 to the next state and starts the ADC 7. At the end of the conversion, the second digital sample is fed to the first inputs of the comparison blocks 1, 2, the second digital inputs of which receive the previous digital sample of the investigated signal recorded in registers 3, 4 the first tact.

The synchronization inputs of the units 1, 2 of the comparison receive a pulse formed at the output. READINESS ADC 7 after the completion of the conversion. Under the influence of this pulse at the output of Comparison Unit 1, if the second digital sample is greater than the first, a signal is generated that records the first register 3 of the larger digital sample, and the third register 5 - the contents of counter 11, corresponding to the time of the second sample.

If the second digital sample is less than the first, then a signal is generated at the output of Comparison Unit 2 that records the minimum digital sample to register 4. And the corresponding content of counter 11 to this sample is written to register 6.

The review process will continue until a predetermined time interval has elapsed.

Claims (1)

Invention Formula A device for determining extremes containing a first comparison unit, first, second, third and fourth registers, an analog-to-digital converter, whose information input is the input of the device, and an information output connected to the first information input of the first comparison unit and to the information inputs of the first and second the registers whose outputs are outputs of the device maximum and minimum values, clock generator, output which is connected to the first input of the element I, an interval setting block, a counter whose output is connected to the information inputs of the third and fourth registers whose outputs are outputs indications of the moments of occurrence of extremes of the device, characterized in that, in order to improve the accuracy, a second comparison unit, a decoder and a trigger are introduced into it, and the generator output clock pulses connected to the counting input of the counter and the sync input of the analog-digital converter, the information output of which is connected to the first information input the second comparison block, and the Readiness output are connected to the synchronization inputs of the decoder, the first and second comparison blocks, the outputs of the first and second registers are connected to the second information inputs of the first and second comparison blocks, respectively, the output of the counter is connected to the information input of the decoder, the information output of which is connected to the first the recording inputs of the first and second registers, the output of the first comparison unit is connected to the second recording input of the first register and to the recording input of the third register, output the second comparison unit is connected to the second the input of the record of the second register and the input of the record of the fourth register, the output of the interval setting block is connected to a single trigger input, the clock input of which is connected to the output of the And element, and with the input of the zero setting of the counter, and the single output - with the second input of the element I.