SU1762275A1 - Device for recording of signal-noise ratio - Google Patents

Abstract

Use for measuring signal suppression about signal / interference in telephones and in the paths of other radio devices. The essence of the invention is that the introduction of an analog-digital converter 1, a first 5, a second 6 accumulating adders, a control unit 3 as well as serially connected computational unit 7 and a functional converter 8 allows the signal / interference ratio to be calculated using small ( first and second) moments, which increases the accuracy of 4 is.

Description

The invention relates to a measurement technique and can be used to measure the signal-to-noise ratio in telephone channels and in paths of other radio devices.

The purpose of the invention is to increase the measurement accuracy.

Fig 1 shows a block diagram of the device; Fig. 2 is a diagram of the algorithm of operation of the computing device, Fig. 3 is a timing diagram of the operation of the device, Fig. 4 is a transfer function of a functional converter.

The signal-to-noise ratio recording device contains an analog-digital converter 1 digital detector 2, a control unit 3 quad 4, a first accumulating adder 5 a second accumulating summatoo 6 computational unit 7, a functional pre-decoder 8 and a recording unit 9

The device works with / .leader

The input signal (it is the sum of the amplitude-modulated signal and an additive interference having a normal distribution and a zero value} is fed to the analog-to-digital converter 1, where it is converted into a digital code, after which the digital detector 2 will correct the signal, which corresponds to representation of this signal in the form of a digital signal-to-noise mixture with a one-sided probability distribution,

From the output of the first accumulating sumtotoa 5, the rectified and iterated value of the input signal-to-noise mixture is formed, while the rectified input signal from the output of the digital detector 2, passing through the quadrant 4 "l of the second accumulating adder 6, forms the dispersion at its output or an integrated square value of the input signal, equivalent to the power of the input smngalo-noise mixture

The control unit 3 determines the accumulation of elementary digital values appearing at the input of both the first accumulating adder 5 and the second accumulating adder 6, as it generates control pulses (CN-Fig. 3) that allow the output bus.

HZ

accumulating a total of 5.6, after accumulating a certain amount of o-ifro-B-L-other on the analog-digital interface 1 and a converted square value on the quad of the 4 input c / drive device.

Computing unit 7 processes the digital values of the integrated signals at the outputs of accumulating adders 5.6 according to the following algorithm: first, the root is calculated from the digital value at the output of accumulating adder 6 (value y, see Fig. 1 and LJ .2). in which the value is obtained; i computing unit 7 corresponds to vY, then dividing the digital code that is at the output of accumulating adder 5 or X HBI is obtained; the resulting value is already in the computing unit 7, and the output of the computing block 7 produces a signal equal to the value X: VY.

After all the informative processes in the computing unit 7 have been completed, the control unit 3 receives an information readiness pulse Ve at the output of the computing unit 7. The control unit 3 turns on (records J; a functional converter 8, during which the value of the digital shoe corresponds to signal to interference ratio.

The functional converter has a transfer characteristic (see FIG. 4), expressed in the following analytical form:

M1

V & X

 JJ} i + ll L l2

Gp

l

/

cos p f

-and

where M1 is the first moment of one-way probability density distribution;

ah, the second moment (dispersion) of the one-sided distribution of the probability density;

h is the signal-to-noise ratio.

From the output of the functional converter 8, the signal is fed to the recording unit 9, where it is initialized.

Control unit 3 synchronizes

operation of all units, including the output registration unit 9. The operation algorithm of the control unit 3 allows you to initially select the number of accumulations accumulating accumulation of 5.6, matching

thus, the optimum is relative to the minimum required number of singal / interference ratios removed at the output and the necessary accuracy of measuring the signal / interference ratio at the output of the same device, which increases with the number of accumulations on accumulating adders 5.6. The number of accumulations in accumulative adders 3.6 is determined by the decoupling of the frequencies .. pulse- at the control inputs of the analog-TsIFP & amp converter 1 and quad 4 to the frequency of the pulses at the control inputs of the accumulating adders 5.6.

The invention of the Ustpoisgro registration of the ratio of interference, containing a digital detector, a quadrant and a registration unit, about t and h with e. that, in order to improve the accuracy of 1 metering, an analog-to-digital converter was introduced into it, the first f. the second accumulate-ie accumulators, control unit, as well as sequentially

connected computing unit and functional converter, while the output of analog-digital converter is connected to the input of a digital detector, the output of which is connected to the inputs of the first accumulator and quad, the output of which is connected to the second input of the computing block, the first input of which is connected to exit first

accumulator, the output of the functional converter is connected to the input of the registration unit, the outputs of the control unit are connected to the corresponding control inputs of the analog-digital converter, quad, functional converter, the registration unit and the computing unit whose synchronization output is connected to the synchronization clock of the control unit.

ED7 /

FMS

2

L

NA

five

X

2

Alternate four

 .

"

control unit. five

-L

/

Y 7

-L

V

i5

Have

X

vY

It

J

FIG. one

РЪ

 2

№ g.Z

Oft of ohm o.wsittmo nows.wo.uso / is0 2 Fig 4

with. of

 2

Claims (1)

Claim Signal to noise ratio recorder. containing a digital detector, a quadrator and a registration unit, about τη and more so. that, in order to improve the measurement accuracy, an analog-to-digital converter, first and second accumulating adders, a control unit, as well as a series-connected computing unit and a functional converter are introduced into it, while the output of the analog-to-digital converter is connected to the input of a digital detector, the output of which connected to the inputs of the first accumulating adder and a quadrator, the output of which through the second accumulating adder is connected to the second input of the computing unit, the first input of which is connected is connected to the output of the first accumulating adder, the output of the functional converter is connected to the input of the registration unit, and the outputs of the control unit are connected to the corresponding control inputs of the analog-to-digital converter, quadrator, functional converter, registration unit, and computing unit, the synchronization output of which is connected to the synchronization input of the control unit . ] Ί (> 22Ί5 FIG. 1 of FIG. 2 L 0.1 0.3956 Oh's 0.3987 0.3 0.3988. al 0.399 / 0.5 0.3998 0.5 0, -2007 0.7 Oh, 7/020 0.8 Oh, 9036. 0.9 0.0055 1.0 O. 0076 1,1 Oh, 7 / 09.9 1.2 Oh, 5-122 1.3 Oh 5/96 1L Oh, 0/68 1.5 O. 519 / 1.5 0.0212 1.7 Oh 0232 1.8 Oh 5250 1.9 Oh, 4,268 2.0 O. 7/288 2.1 O. 5298 -j Compiled by L. Emelkin Editor Tehred M. Morgenthal Corrector M. Maximishinets Order 3258. Circulation Subscribed. VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, Gagarin St. 101