SU760157A1 - Device for receiving pulse-frequency information - Google Patents

Description

The invention relates to telemechanics and can find application in measuring information systems in which the frequency form of data presentation is adopted.

A device for receiving a pulse-frequency information, comprising triggers Elements And, the input bus ⁵ You are a drive Khodnev [1}.

The device has a limited speed and a large amount of output information, which complicates and complicates the process of its further processing. _ten

Closest to the invention to the technical essence is a device for receiving frequency-pulse information, containing the reference frequency generator,. the output of which is connected to the zero input of the comparison trigger and the first input of the first 15 element AND, the single input of the comparison trigger and the first input of the second element AND are connected to the device input ^ the trigger outputs, the comparisons are connected respectively to the second inputs of the first and second AND elements whose outputs are connected respectively to the subtractive input of the reversible counter, the single input of the first trigger of memorizing the sign of deviation

frequency and the summing input of the reversible counter, zero inputs of triggers for memorizing the sign of frequency deviation are interconnected, outputs for trigger for memorizing the sign of deviation, frequency are connected with corresponding inputs of the third element And [2 |.

Along with such a positive quality as high speed, this device has a serious drawback. The amount of output he has is large, since it is necessary to transfer the contents of the reversible counter after each change of its contents. This complicates and complicates the further processing of information. _β · ··

The aim of the invention is to "increase the information content of the device,

This goal is achieved by introducing into the device a counter, an OR element and a signal analysis unit, the control inputs of which are connected respectively to the additional output of the reference frequency generator, the output of the OR element, the output of the AND element and the first output of the counter, the counting input of which is connected to the output of the generator reference frequency

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the output of the signal analysis unit is connected to the input of the initial installation of the reversible counter, the zero input of the second trigger for storing the frequency deviation sign and the input of the initial installation of the counter, the second output of which is connected to the first input of the OR element and the first information input of the signal analysis unit, the second information input of which is connected to the output reversible counter, the information output of the signal analysis unit is connected to the output of the device, the output of the first element AND is connected to the second input of the element OR, the third the input of which and the single input of the second trigger of memorizing the sign of the frequency deviation are connected to the output of the second element I.

The drawing shows the block diagram of the device.

The device contains a reversible counter 1, block 2 analysis of signals, the element OR 3, the elements And 4 and 5, the counter 6, the trigger 7 comparison, the element And 8, the generator 9 of the reference frequency, the trigger 10 and 11 remembering the sign of the frequency deviation,

The device works as follows

The reference pulse sequence from the reference frequency generator 9 is fed to the zero input of the comparison trigger 7, the analyzed pulse sequence is fed to the single input of this trigger.

Consider the point in time when the comparison trigger 7, the first 10 and second II triggers of memorizing the sign of the frequency deviation are in the Zero state. In the operation of the device, three situations are possible: complete equality of the reference frequency and the frequency of the analyzed sequence, the analyzed frequency is higher than the reference frequency, the reference frequency is higher than the analyzed one.

Consider the situation when the reference and analyzed frequencies are equal to each other. Then each pulse of the analyzed frequency will correspond to the next reference pulse following it. After the end of the first pulse of the analyzed frequency trigger comparison 7 goes into one state. Next, the switching cycles of trigger 7 will be repeated. Since during the pulse of the reference frequency the trigger 7 is in a single state, the passage of pulses through the first element I 4, in, is prohibited. the pulse time of the analyzed frequency trigger 7 is in the zero state, which prohibits the passage of pulses through the second element And 5.

Considering the situation when the frequency of the analyzed sequence is higher than the reference one, it can be noted that in this case there must necessarily be periods of time between the passage of reference frequency pulses, during which more than one arrives (for definiteness)

pulse frequency analyzed. In this case, at the moments of arrival of all £ 1 pulses of the analyzed frequency (except for the first), trigger 7 is in a single state, and ί -1 the pulse passes through the second element And 5.

In a situation with a lower compared to the reference frequency of the pulses of the analyzed sequence, there should be intervals between the pulses of the analyzed frequency, during which more than one (for definiteness £) pulses of the reference frequency arrive. Then at the moments of arrival £ -1 of them (except the first) trigger 7 is in the zero state, and) .- 1 pulse passes through the first element And 4.

Since the output of the first element AND 4 is connected to the single input of the first trigger 10, memorizing the sign of frequency deviation 10, and the output of the second element 5, to the single input of the second trigger II of memorizing the deviation sign, the first situation corresponds to the invariable zero state of both triggers memorizing the deviation sign. In the second situation, the trigger 10 is in the zero state, and the trigger 11 is in the unit state, in the third situation the trigger 10 is in the unit position, and the trigger 11 is in the zero position. In each of these situations, the third element And 8 is closed. The signals from the output of the first 4 and second, 5 elements And served on the subtracting and summing the inputs of the reversible counter I, respectively. Thus, the contents of the reversible counter 1 either invariably (the first situation), either does not increase monotonically (the second situation), or does not decrease monotonously (the third situation).

The counter 6 counts the pulses of the reference frequency and, thus, is a timer. With a constant frequency of the analyzed sequence, the change in the content of the reversible counter 1 is strictly linear in time. The linearity of the change in the contents of the reversible counter in time, determined by the contents of counter 6, is determined by the signal analysis unit 2. To do this, at its control input, the cc element OR 3 receives all the signals for changing the contents of the reversible counter 1. Next, using signals from the additional generator output 9 of the reference frequency, fed to one of the control inputs, the analysis unit 2 compares the increment of the counter 6 with the expected increment, which is determined on the basis of the previous comparative analysis of the contents of counters 1 and 6. If the increment is within acceptable limits, block 2 calculates the next expected at ascheniya. Otherwise, analysis block 2 outputs data at its information output.

five

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<, the frequency at the analysis site and the time of the end of this area, which is the code of the time of receipt of the preceding pulse from the output of the element OR 3. The frequency P must then be calculated using the formula

"_ P + C ^P T, -T _o '

where P is the change in the contents of the reversible counter I during the analysis section;

C - change the contents of the counter 6 during the analysis section;

That is the code. the arrival time of the preceding pulse from output 3, formed during the previous information output;

Τ ι - the code of the time of arrival of the preceding pulse from output 3, which is currently generated.

Since counter 6 has a finite number of digits, it may overflow, and further analysis of the frequency by the analysis unit 2 signals will become impossible. Therefore, from one of the outputs of the counter 6, an overflow pulse is fed to the inputs of the analysis unit (directly and through the element OR 3). The appearance of signals at the inputs of block 2 causes the forced issuance of the frequency and code of the end of the analysis section to the output of the device. This occurs at the moments of abrupt changes in the frequency of the analyzed pulse sequence, which corresponds to setting the unit of both triggers 10 and 11 to memorize the sign of the deviation and the appearance of a unit voltage level at the output of the third element I 8.

Simultaneously with the issuance of information at the output of the device, a pulse is generated for the initial installation of the contents of the triggers 10 and 11, counter 6 and reversible counter I, after which the operation of the device is repeated.

The use of the invention will allow several times (depending on the type of analyzed pulse frequency sequences) to reduce the amount of output information.

Claims (1)

Claim A device for receiving pulse frequency information, comprising a generator reference frequency, the output of which is connected to the zero input of the comparison trigger and the first input of the first element And, the single input of the comparison trigger and the first input of the second element And connected to the input of the device, the outputs of the comparison trigger are connected respectively to the second inputs of the first and second elements And, the outputs of which are connected respectively to the subtracting input of the reversible counter, the single input of the first trigger of storing the sign of the frequency deviation and the summing input of the reversible counter, zero inputs of the trigger triggers Memorizing the sign of the frequency deviation is interconnected, the outputs of the triggers remembering the sign of the frequency deviation are connected to the corresponding inputs of the third AND element, characterized in that, in order to increase the information content of the device, a counter, an OR element and a signal analysis unit, whose control inputs are connected, are entered into it with an additional output of the reference frequency generator, the output of the OR element, the output of the AND element and the first output of the counter, the counting input of which is connected to you _: the reference frequency generator The control output of the signal analysis unit is connected to the input of the initial installation of the reversible counter, the zero input of the second trigger for storing the sign of the frequency deviation, and the input of the initial installation of the counter, the second output of which is connected to the first input of the OR element and the second information input of the signal analysis unit connected to the output of the reversible counter, the information output of the signal analysis unit is connected to the output of the device, the output of the first element I is connected to the second input of the element nta OR, the third input of which and the single input of the second trigger memorizing the sign of the frequency deviation are connected to the output of the second element I.