SU601625A1 - Frequency-code converter - Google Patents

Description

The invention relates to computing technology, in particular, to devices for converting frequency into a CODE, used in information-measuring systems, where the tasks of recording and processing information from sensors of various types are solved.

A frequency-code converter is known that contains a pulse generator of a reference frequency, the output of which is connected via a switch to the digital output of the counter, whose output of the bits is connected to the corresponding inputs of the memory register, and the reset pulse generator, output on which the input of the OR element, the other input of which is connected to the input source, and the output of the OR element is connected to one of the trigger inputs, the output of which is connected to the key control input 1.

This transducer functions with low accuracy.

Closest to the proposed frequency-code converter, comprising a reference frequency generator, a reset generator, two OR elements, a pulse delay unit, a key, a trigger, a pulse counter, and a storage register.

The disadvantage of this device is the ambiguous conversion characteristic associated with the reference counter overflow

frequency 1 when the measured frequency goes beyond the lower limit of the measuring range of the transducer, which causes the appearance of nonzero false information and can lead to gross errors in determining the measured parameter 2.

The purpose of the invention is to improve the accuracy of the conversion. This goal is achieved in that the frequency-1co.d converter, containing a reset generator, a reference frequency generator, the output of which is connected to the first input of the delay unit and through the key to the first input of the pulse counter, the output of which bits are connected to the corresponding inputs of the storage register , the second input of the delay unit is connected to one of the inputs of the first OR element, the output of which is connected to the first trigger input, the trigger output is connected to the key control input, and its second input is connected to the first output of the block aderzhki; The second output of the delay unit is connected to one of the inputs of the second OR element, the output of which is connected to the second input of the pulse counter, the third input of which is connected to the third output of the delay unit, two OR elements and a waiting multivibrator, whose input is connected to the output of the pulse counter, and the output the standby multivibrator is connected through one of the inputs of the first additional element OR to the input of the storage register and to the first input of the second additional element OR whose output is connected to the other inputs of the first and the second OR element and 1K to the third input of the delay unit, the fourth output of the delay unit is connected to the other input of the first additional OR element, and the output of the reset generator is connected to the BTOpOiMy input of the second additional OR element.

The drawing shows the converter circuit of the frequency-1COD.

Frequency-1 code converter contains delay / block, pulse counter 2, storage register 3, trigger 4, reference frequency generator 5, reset generator 6, key 7, elements OR 8 - // and waiting for Multivibrator J2.

The converter works as follows.

The pulse of the measured frequency through the element 8 sets the trigger 4 to the state "O", prohibiting the passage of reference pulses of the reference frequency from the generator 5 and thereby ending the conversion of the Previous period and 3 MEASUREMENT. At the same time, it starts a pulsed delay unit /, which generates Transformation control signals shifted relative to each other and To the input signal. P1mPulse from the first output of the block / Via the element // records the information from counter 2 to register 5, where it is stored the entire subsequent measurement period.

The impulse from the second output of the block / through the element OR 9 resets the counter 2, the impulse from the third output of the block 2 makes the initial entry into the counter 2, the impulse from the fourth exit of the block / sets the trigger 4 to the state "1, starting a new transformation. Thus, in the Converter, for each measurement period, some fixed control time is allocated, pre-recording into the counter 2 of the time code spent on the control to compensate for the systematic component of the fault, and the measurement of the remaining part of the period occurs. The reset generator 6 makes the initial installation of the converter in “O with: power supply voltage. If the measured frequency goes beyond the lower limit of the measurement range, the overflow pulse of meter 2 is triggered by the waiting multivibrator J2, the signal of which stops the conversion, sets the trigger 4 to the state "O", sets the initial delay unit 1, and writes the zero to the storage register 3. With the arrival of the next pulse, the measurer carried out the frequency boom. Thus, when a device arrives at the input of a frequency that goes beyond the lower limit of the conversion range, at the output of the frequency-stake converter, there is always zero information.

Claims (2)

1. USSR author's certificate No. 415595, G 01 R 23/02, 28.07.72. 2. Application No. 2193644/21, G 01 R 23/02, 01.12.75, according to which the decision to issue the author's certificate was made.