SU369703A1 - - Google Patents

Description

DEVICE FOR TRANSFORMING FREQUENCY TO CODE

one

This invention relates to the field of computing.

Devices are known for converting a frequency into a code comprising (serially connected an input driver, a key, a counter, as well as a sensor of a calibrated time interval, a vernier key, and a counter of an additional digit.

The proposed device for frequency conversion into a code differs from the well-known topics that it contains an additional key, an AND logic circuit, a reversible counter, a decoder, a coincidence circuit, a vernial and a reference oscillators, whose outputs are connected to the subtractor via a matching circuit ( a counter connected via a monitor to the control input of the vernier key, and the output of the reference generator is via an additional key, the control inputs of which are connected respectively to the output and (the INPUT of the sensor connected to the sum, and the input of the reversible counter, and the input of the non-starting generator through a logic circuit "AND connected to the output of the driver and to the second control input of the vernier key, which greatly simplifies the design (Converter) while maintaining a high conversion accuracy in wide frequency range.

On fng. 1 is a block diagram of a device for frequency conversion to a code; “And FIG. 2 - time diagrams of us, which show his work.

Device for transformed; Frequency code contains an input driver /, the output of which is via (key 2 is connected to the high-order counter 3, as well as via the onus key 4 to the additional-discharge counter 5, the sensor of the calibrated time interval 6, synchronized by the frequency of which is connected to the first control input of the additional key 7, to the potential input of the logic circuit "And 8" and to the reference generator 9, the output of which, together with the output of the Vernier generator 10, is connected to the coincidence circuit // connected to the subtractor A reversible counter 12, the summing input of which is connected via a switch 7 to the output of the reference generator 9. The reverse counter 12 via a decoder 13 is connected to the control input of the vernier key 4, the second control input of which is connected to the input of the Vernier generator 10 and the output of the logic circuit 8 whose input is connected to the output of shaper 1.

Consider the operation of a device for converting a frequency into a code in the general case when one or several pulses of the reference sequence (o) are located between the end of the calibrated interval Tn and the next with a M1 pulse of the frequency being converted. that is, in 1 time interval A / (the number of pulses of the reference sequence S 2, Fig. 2, a, b). First, a signal from the control unit (not shown in the drawing) is produced overgrown and the IB reversible counter is written "1. The first impulse of the converted frequency fx, coming from the output of the imager 1, signals sensor 6 of the calibrated time interval, which opens the key 2 for the time interval Hz, through which the frequency pulses fx are measured and the counter 3. The duration of the time interval Г „is sufficient for evaluation Is the highest order, i.e., no more than ten periods of the maximum value of the frequency being converted. During the interval T „, the counter 3 fixes the number of pulses corresponding to the value of the highest bit of the frequency being converted. At the time of the end of the interval T, the sensor 6 of the calibrated time interval closes the key 2, opens the key 7, starts the reference generator 9, and opens the logic circuit 8 at the potential input, allowing the next f-pulse of the converted frequency fx to start the nonius generator 10 and the control input of the vernier key 4. Since, in the time interval of the DW, two pulses of the apore frequency are located, they first pass through the public key 7 to the summing input of the reversible counter 12, increasing the written value of not from “1 to“ 3. After the last reference pulse is written to the counter, the first pulse of the converted frequency fx starts the vernier generator 10, which has a follow-up period, pulses / and Somewhat different from the follow-up period of the reference oscillator (Fig. 2, b), and also opens the innovative key 4, through which the pulses of the converted frequency fx begin to pass to the counter 5 additional. In the moment of coincidence of the pulses of the vernier and reference sequences, the output pulse of the matching circuit // passes to the subtractive input of the reversible Counter 12 (Fig. 2, d), copying "1" from the number entered into it. Next, the process is repeated until the new coincidence of the pulses of the vernier and reference sequences, which leads to the description of the following "1, etc." When the zeros appear in all bits of the reversible counter, the decoder 13 generates a signal that closes the key 4. The additional counter counts the NUMBER impulses of the transduced frequency fx passed through the vernier key 4. in the time interval} l / will not have a single impulse of the reference T1.c of the sequence (5 0), then, in this case, the impulse from the coincidence circuit // will be deleted. in the counter 1 start of the measurement, ii decoder J3 closes loniusny spanner 4, fixing the number of pulses in the counter frequency preobrauemoy 5 dololnitelnoo discharge. For the case of (Exceeding the pulses of the reference sequence of the period of the period of the frequency to be converted, T, (5 5), the basic scale equation of the proposed device for converting the frequency to the code Ch + G, (5) G ". VX / Number of pulses | frequency f, calculated from the moment of launching the pulses of the vernier sequence until the moment of coincidence of the imnous1 in the reference and vernier Sequences, i.e., during time T, is equal to rti T-fx sequences for example 1.1 T ", time G 10AH. Taking into account these expressions, we obtain the values of the frequency to be converted, + 0, l (Wn,) l. II Hence it is obvious that the additional bit of the frequency to be converted should be counted out IB by the additional code. to convert a frequency into a code containing a serially connected input driver, a key, a counter, and a calibrated time interval sensor, a vernier key, and an additional counter (bit, characterized in that, in order to increase the reliability of the device, it contains there is an additional key, an AND logic, a reverse counter, a decoder, a coincidence circuit, a vernier and a support; a new generator, the outputs of which are connected to the subtractor of the reverse graphical counter, connected with a vertical input converter, through the control circuit 1 and the output of the reference generator through an additional key, the control inputs of which are connected respectively to the output and the sensor input of a calibrated time interval, is connected to the summing input of a reversible counter, and; input non usnogo generator through logic "AND shaper connected to the output and to the second control input key vernier.

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