SU1698814A1 - Pulse-modulated frequency meters - Google Patents

Abstract

The invention relates to the technique of electrical and radio measurements and can be applied, for example, in sonar to determine the parameters of frequency-modulated signals. The pulse-filling frequency meter contains a pulse shaper 1, an And 2 element, a counter of 4 periods of the measured frequency, an arithmetic unit 5, a counter of 6 periods of the reference frequency, a shaper of 7 intervals, a shaper of 8 pulses, and a frequency generator 9. Introduction of the And 3 meter, the storage register 13 and the new connections to the meter made it possible, by dividing a burst of pulses into smaller and equally numerous ones, to increase the measurement performance and expand the functionality. 1 hp f-ly, 2 ill.

Description

SP

with

about: a

five

The invention relates to electroradiation measurements and can be used, for example, in sonar to determine the parameters of frequency-modulated signals.

The purpose of the invention is to increase speed and enhance functionality.

Figure 1 shows the structural diagram of the meter; FIG. 2 shows timing diagrams explaining his work.

The pulse-filling frequency meter contains a pulse shaper 1, elements 2-3, a counter of 4 periods of the measured frequency, an arithmetic unit 5, a counter of 6 periods of the reference frequency, a shaper 7 intervals, a shaper of 8 pulses, a generator 9 of the reference frequency, the third output 10 of the output information, input 11 input information, the second output 12 output information of the arithmetic unit 5, the register 13 of the storage.

The arithmetic unit 5 comprises a data I / O decoder 14, an information input port 15, information output ports 16-18, a data bus 19, an address bus 20, a control bus 21, a dividing control unit 22 and a memory unit 23.

The output of the reference frequency generator 9 is connected via serially connected elements I 2, counter 6, register 13 and input 11 of information input connected to the input of information input port 15, and the output of generator 1, whose input is the input of a frequency meter, is combined with the subtracting input of counter 4 and the entry of the imager of 7 intervals, the subtractive input of which is connected to the output of the element II 2, and the transfer output is combined with the input of the imager of 8 pulses and the second input of the element II 2. The outputs of ports 17 and 18, which are the outputs of the information arithmetic unit 5 is connected, respectively, to the D-inputs of the interval imager 7 and counter 4, the loan output of which is combined with the register entry input 13, the second input of interrupt requests of the arithmetic unit 5 and through the And 3 element connected to the record input of counter 4, the imager 8 output connected to the reset input of the counter b and the first input of the interrupt request of the arithmetic unit 5. The first, second and fourth outputs of the decoder 14 are connected respectively to the blocking ports 15,17 and 16, the output of which is the output of the meter, and t The retirement output of the decoder 14 is combined with the second input of the element I 3 and the blocking input of the port 18.

The first and second interrupt request inputs of the arithmetic unit 5 are the same inputs of the control unit 22, and the outputs of the information output ports 17 and 18 are respectively the output 12 and 10 of the information output of the arithmetic unit 5. The data inputs of the ports 15-18 of the control division 22 and memory unit 23 are connected by data bus 19, address inputs of control unit 22, memory unit 23 and decoder are combined with address bus 20, and control inputs of ports 15-18, decoder 14, memory unit 23 and control divider 22

combined by bus 21 control.

The meter of the frequency of filling the bursts of pulses works as follows.

In the initial state, i.e. in the absence of input pulses during initialization

arithmetic unit 5, the third output of the decoder 14 receives a pulse at the blocking input port 18 of the output information, which writes the code of the number N to the port 18 with a negative front, while

The logic level 0 of the same pulse records the code of the number N in the counter of 4 periods of the measured frequency. Similarly, the code for the delay coefficient K is written to port 17.

The counter 6 periods of the reference frequency is in the zero state.

The generator 9 of the reference frequency produces pulses with a period r0 (FIG. 2a). The shaper 7 intervals is in

zero state, while the logical 0 from the output of the generator 7 is fed to the second input of the element I 2 and prohibits the passage of reference frequency pulses from the output of the generator 9 through the element 2 on

subtracting the counting input of the interval imager 7, and on the D-inputs of the parallel loading of the imager 7, the delay coefficient code K is always present, i.e. the driver 7 is programmed to the division factor K, and the code for the coefficient K comes from the output of port 17 of the information output of the arithmetic unit 5 to the D inputs of the driver 7 and its sign

The choice is chosen from conditions K -

When the meter arrives at the input of a pack with an unknown filling frequency, impulses are formed at the output of imaging unit 1, the period of which Tx is equal to the frequency of the input signal, and the total duration of such a pack of pulses is Tn (Fig. 2b).

These pulses are fed to the counting counting input of the counter of 4 periods of the measured frequency and the recording input of the imager 7 intervals. Counter 4 divides the measured frequency by N, i.e. every N pulses of the measured frequency at the output of the loan of counter 4, a negative pulse is generated, which through the element 3 arrives at the input of the record of counter 4, reloading it with the number N, a also at the input of the register 13 storage (figv) and the second input of interrupt requests of the arithmetic unit 5. The interval imager 7 delays the pulses of the measured frequency by the value K of the delay coefficient. The delay is as follows. With the leading edge of the first pulse of the measured frequency, the interval generator 7 is set to state K, since its D inputs contain the corresponding code from the arithmetic unit 5. At the same time, its output of the loan has a logical 1 signal, which, at the input of the element And 2, permits the passage of pulses of the generator 9 through it to the subtracting counting input of the imaging unit 7 intervals and summing counting input of the СЧР-чика 6 periods of the reference frequency. If the peripd Tx of the pulses of the measured frequency of the input signal satisfies the condition Tx K r0, which is ensured by the corresponding coefficient K, then the output of the generator 7 during the entire batch of pulses will be a logical 1 signal, and the logical 0 signal at its output of the loan will Cg0 relative to the leading edge of the last pulse of the pack (Figg). From the exit of the borrower of the interval imager 7 intervals, a pulse of duration Tn + KT0 is produced. A counter of 6 periods of the reference frequency carries out, during the duration of this pulse, the counting of the pulses of the reference frequency of the generator 9 (Fig. 2d).

The contents of the counter 6 periods of the reference frequency by the positive edge of the pulse from the output of the counter of 4 periods of the measured frequency, which is generated every N periods of the measured frequency, are recorded in the storage register 13. The pulses from the output of the counter of the measured frequency 4 are also fed to the second request input interrupt control unit 22 dividing, made an interrupt request.

The control unit 22 processes the interrupt requests arriving at the second input of the interrupt requests by submitting the corresponding codes via the control buses 21 over the address buses 20 to the decoder 14 of the information input / output device, the information output ports 16-18 and the input port 15 information that reads the contents of the counter 6 periods of the reference frequency through the register 13 and the port 15 of entering information into the corresponding memory cell of the memory block 23. In this case, the cells of the memory block 23 will be

Store the contents of the counter 6: ni

mnm in codes corresponding to successive time intervals Tx-N, ... TxIN .... Tx m N,

where i is the number of the interrupt request pulse generated by the counter 4;

m is the number of interrupt request pulses generated by the counter 4, with m being a part of the Tp / Tx N ratio, i.e. rrr is the number of intervals in which the value of the pulse filling frequency f Xi with the duration Tn is measured.

The shaper 8 generates a pulse (fig. 2d), the leading edge of which co-operates with the falling edge of the pulse at the output of the imaging unit 7 intervals, and the falling edge is delayed relative to it for the time t3 required for processing the information stored in the memory block 23, upon request incoming interrupt request block 22. This pulse makes a request for interruption, and entering the reset input of counter 6 sets it to the zero state.

The dividing control unit 22, when the leading edge of a pulse arrives from the imaging unit 8, calculates m elements of the array fxi of the pulse filling frequency values by the formula

fN

Tx | (n, - n, - 1) r0 where N is the division factor of counter 4;

t0 - the period of the pulses of the generator 9;

um, pi - the contents of counter 6 at times Tx i N and Tx (i-1) N; i is the interrupt request number, takes a value from 1 to m.

As a result of the calculations, the control unit 22 sequentially writes m values of the measured frequency to the memory unit 23. Then, the control unit 22 determines the maximum fx max, the minimum fx min and the average fx cp of the pulse filling frequency and, based on the obtained filling frequency values, it produces an indication of the frequency filling of the pulse: a simple pulse if there are no maximum and minimum values; complex impulse, otherwise.

After this, the codes corresponding to the values of the frequencies fx Min, gx cp, fx max, fxi. successively on the data bus 19, they are supplied to the input of the information output port 16 and further to the output of the meter. Information output is synchronized from information output synchronization output 24, which is connected to the blocking input port of information output 16. The sequence of values of fxi makes it possible to judge the law of frequency modulation of the pulse.

Thus, the proposed pulse filling frequency meter allows, in comparison with a known meter, to increase the measurement performance by dividing the bursts into smaller and equally numerous ones, as well as to expand the functionality if it is necessary to determine the parameters of frequency-modulated signals.

Claims (2)

Claim 1. A pulse meter filling frequency meter containing a first driver, whose input is a meter input, a second pulse shaper, a period counter of the measured frequency, an interval shaper, an arithmetic unit, the first output information output of which is a meter output, successively the connected reference frequency generator, the first And element and the counter of the reference frequency periods, the reset input of which is combined with the output of the second pulse generator and the first interrupt input an arithmetic unit, where the input of the interval imager is combined with the output of the first pulse generator and the subtractive input of the counter of the measured frequency periods, the D inputs of the interval imager are connected by delay buses to the second output information output of the arithmetic unit, and the transfer output is combined with the input of the second pulse maker and the second input of the first element, O, of which, in order to increase speed and enhance the functionality, it is additionally introduced Torah AND gate and a register storing, D-inputs of which are connected to the outputs of the counter reference clock periods outputs - to the input information input arithmetic unit, and the recording input is combined with the first input of the second element I, the borrowing output of the period counter of the measured frequency and the second interrupt input of the arithmetic unit, the third output of the information output of the arithmetic unit being connected to the D inputs of the period counter of the measured frequency, and the installation output of the arithmetic unit the unit is connected to the second input of the second element I, the output of which is connected to the input of the record of the period counter of the measured frequency. 2. The meter according to claim 1, from l and h and y and y and the fact that the arithmetic unit contains a memory unit, a dividing control unit, first, second and third information output ports, an information input port, and a descriptive information input / output device, the first and second interrupt inputs of the control division unit being the first and second interrupt inputs of the arithmetic unit, the outputs of the first, second and third information output ports are respectively the first, second and third outputs of the information output of the arithmetic unit, the input of the information input port is the input of information input arithmet unit, the data inputs of the first, second and third information output ports, the data input port, the control divider unit and the memory unit are combined by the data bus; the address inputs of the divider control unit, the unit the memory and the decoder of the information input-output device are combined by the address bus, the control inputs of the control divider unit, the memory block, the information input port, the decoder of the information input-output device, the first, second and third information output ports are combined by the control bus; the second and fourth outputs of the I / O decoder are connected respectively with the locking inputs of the information input port, the second and first information output ports, and the third output of the I / O device decoder is connected to the locking input of the third information output port and is the installation output of the arithmetic unit. / 7t O 1 2 J X about 1 g s and / cn-L and I I I I I I I I I I I I I I I I I I -J U N7 figure 1 / 7t O 1 2 J X I I I I I I I B