SU851752A2 - Device for determining the difference of two frequencies - Google Patents

Description

(54) yCTPOlCTBQ TO DETERMINE THE DIFFERENCE

t

The invention relates to measuring and computing technology and can be used to construct functional transducers of the difference of two frequencies into a digital code, as well as when constructing calculators to solve a system of two linear algebraic equations.

A device for determining the difference between the two frequencies, which contains a pulse counter, a switch of the operating modes of the counter, an operating generator and a mixer, the device input through one switch contacts: connected directly to the counter input, and through contacts - E to the mixer, the second input co-, 5 torso is connected to the reference generator, the frequency is equal to the capacity of the pulse counter divided by the measurement time 3

The known device does not allow solving a system of two linear equations:

f, .b, n,

: i-- zV4 "2 TWO FREQUENCIES

according to the calculation algorithm

.

(I) V-V.,

N, N (2. - calculated parameters}

Where - - information frequencies; t -, - t t - times of calculation VV3T .T, toa /. Tj - C / l; ,,

where Ak-s-Ct / iba-Cibt

since the known meter assumes the total computation time of the frequencies and f2

. The purpose of the isophenenia is to expand the functionality / by telling the device the ability to solve a system of two linear equations.

The goal is achieved by. the fact that in .jycipoEcTBo to determine the difference between two frequencies, contains a pulse counter, a switching unit, a reference oscillator, a mixer and a time interval generator, the device input being connected through one contact of the switching unit directly to the input of the pulse counter, and through other contacts to the mixer, the second input, which is connected to the reference generator, is additionally introduced a pulse counter and a mixer, the first and second heads of the additional mixer being connected respectively to the output generator. The operatic frequency and the fourth transient switching unit, the fifth input of which is connected to the output of the additional mixer, the second output of the switching unit is connected to the counting input of the additional pulse counter, the control input of which is connected to the output of the time interval former, The functional diagram of the device is shown . / The device contains a switching unit 1, a counter 2, the information input of which is connected to the first output of block 1, a mixer 3, one input of which is connected to the third terminal of bluff 1, and the mixer 3 is connected to the fourth input of block 1, the reference generator 4, upstream connected to another input of the mixer 3, the driver 5 i eMeH of intervals, the outputs of which are connected respectively to the control input of the counter 2, with the third and sixth inputs of block 1, the first and the thermal inputs of the driver 5 connect, respectively, to the output of the reference generator ora 4 and with the fifth output of block 1, additional counter 6, the information and control inputs of which are connected respectively to the second output of block 1 and the code T of the imager 5, and the additional mixer 7, are connected to the inputs of the base respectively with the output of the reference oscillator 4 and with the fourth code 1, and the code is connected to the first unit of block 1. The switching unit 1 contains eight elements. And 8-15 and the control unit 16, the device operates as follows, oom, In Addition mode. The first output of the control unit 16 is in the lag state (1 ches41 units.). The second output of the control unit 16 is always in the opposite state. Elements And 8 and 9 are open for pulses with a frequency f. Elements And 14 and 15 of the cable; At the same time, elements 12 and 13 are opened and a signal with a frequency {arrives at counters 2 and an additional counter 6. The pulse counts intervals by counter 2 and additional counter 6 are equal respectively to Tj according to the calculation algorithm (1). After starting the counters, the corresponding codes remain on them play- fiV-V3 Interv In the shaper 5, counting clock alarms are formed from frequency Q pulses coming from the output of the reference generator 4 after the start pulse from the fifth rise of the switching unit 1. In the Subtraction mode, elements 10 and 11 are opened by the potential of the logical unit from the second output of the control unit 16. Elements 8 and 9 are closed, at their outputs there are potentials of logical units that open elements 12 and 13. Elements 14 and 15 are open for signals from the outputs of mixer 3 and an additional mixer 7. Signals with a frequency f2 through elements AND ten 11 are fed together with the signal from the reference generator 4 to mixer 3 to 7. For additional mixer tanks ELAPSED (aces counters 2 and 6 are selected, based on the ratio with the reference frequency. "O - E. ./T. The signal from the output of the mixer 3 during the time T2 enters the counter 2 pulses, where it is added to the number And recorded in the Addition mode. As a result of the summation of the two pulsed streams, the counter 2 enters Nj the number of pulses N4-aiVTaV E but, since the capacitance of the counter 2 is equal to Ел, the resulting number is equal to - Ь. T-.f., Similarly, for the signal from the output of the additional mixer G 7 we get ,, i: -T4 € i Teach (wah, which records in the counters, with the modulus numbers, you can write fNal-T3f tT4f.

Claims (1)

Claim A device for determining the difference of two frequencies by auto, St. No. 314149, characterized in that, in order to expand the functionality, an additional pulse counter and mixer are introduced into it, the first and second inputs of the additional mixer being connected respectively to the output of the reference frequency generator and the fourth output of the switching unit, the fifth input of which is connected to the output additional mixer, the second output of the switching unit is connected to the counting input of the additional pulse counter, the control input of which is connected to the output of the time shaper vomiting.