SU129749A1 - The method of measuring the rms value of a periodic signal, the rms value of the stationary noise, or the ratio of these values - Google Patents

The method of measuring the rms value of a periodic signal, the rms value of the stationary noise, or the ratio of these values

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Publication number
SU129749A1
SU129749A1 SU640396A SU640396A SU129749A1 SU 129749 A1 SU129749 A1 SU 129749A1 SU 640396 A SU640396 A SU 640396A SU 640396 A SU640396 A SU 640396A SU 129749 A1 SU129749 A1 SU 129749A1
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SU
USSR - Soviet Union
Prior art keywords
rms value
signal
values
ratio
measuring
Prior art date
Application number
SU640396A
Other languages
Russian (ru)
Inventor
И.А. Цалкин
Original Assignee
И.А. Цалкин
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Application filed by И.А. Цалкин filed Critical И.А. Цалкин
Priority to SU640396A priority Critical patent/SU129749A1/en
Application granted granted Critical
Publication of SU129749A1 publication Critical patent/SU129749A1/en

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Description

Во МНОГИХ спецкальных о5.-|аст х радиоэлектроншси имеетс  необXD ,iiMCCTh точног:) измсрени  величин сигнала при наличии шума, самого шума или отношени  сигнал/ш м. Pi.sBCCTHbie способы нозиол ют измер ть сигнал и . раздельно, но не1 звестен способ измерени  этих величин, когда они присутствуют одновременно и соизморИмы.In many specials about the 5.- | ast x, the radio electronics have the necessary XD, iiMCCTh accurate measurements of the signal values in the presence of noise, the noise itself or the signal-to-w ratio. Pi.sBCCTHbie measure the signal and. Separately, but there is no known way to measure these quantities, when they are simultaneously present and comparable.

Преимушеством пред.тагаемэго способа  вл етс  то, что он дает возможность измер ть -клзанньге величины на выходе исследуемого устройства в услови х эксплуатации и устран ет вли ние переходных процессов в устройстве на резу.гьтат измерений. Это достигаетс  применением автокоррел ционного способа измерени  еигна,1а и отношени  сигнал/шум.The advantage of this method is that it makes it possible to measure the magnitude of the magnitude of the output of the device under study under operating conditions and eliminates the effect of transient processes in the device on the measurement results. This is achieved by using the autocorrelation method of measuring the signal, 1a, and the signal-to-noise ratio.

Сущность способа состоит в с.тедуюшем: на вхоа ;к-следуемого устройства / (см. блок-схему) подаетс  известпьгй де ерминированный снгнал. нап})имер синусоидальный сигнал или сери  пр моугольных импульсов с опредсл(Т1Ным периодом повторени . Полученный на выходе устройства сигнал подаетс  на коррелометр 2, причем на один вход коррелометра поступает сигнал непосредственно с выхода канала, а на другой вход -- через устройство задержки 3. Врем  задержки выбираетс  кратным нескольким периодам повторени  детерминированного сигнала, но значительно большим, чем интервал коррел ции П1ума. При зтом на величину измеренного коэффициента автокоррел ции не вли ет переходна  характеристика исследуемого устройства и нелпне1 п1ости, имеющиес  в тракте, так как гармоники, по вл юшиее  в тракте из-за нелинейностей , имеют интервалы коррел ции кратные интервалу коррел ции OCHOI ной чаетоты. а врем  задержки выбираетс  большим, чем врем  установлени  переходных процессов. Теоретически полученное выражение св зывает между собой измеренный коэффициент автокоррел ции при фикскровапном времени задержки, среднеквадратичное значение шума и среднеквадратичное значенне сигнала при компенсации средних значеsnni обоих процессов пли дл  случа  процессов с нулевыми средними :-:иач(ниими. Это выражение может быть нредставлено как зависимость между измеренным коэффициентом автокоррел ции и отношением сред}1еквадратичцых значений сигнала и шума.The essence of the method consists in the following: on the input; to the device to be followed / (see the flowchart), a known de-terminated information is supplied. ip}) measure a sinusoidal signal or a series of rectangular pulses with a determined (T1Nm repetition period. The signal received at the device output is fed to the correlometer 2, and the signal from the channel output is sent to one input of the correlometer, and to the other input through the delay device 3 The delay time is chosen to be multiples of several periods of repetition of the deterministic signal, but significantly longer than the correlation interval of P1uma. In this case, the value of the measured autocorrelation coefficient is not affected by the transient nature The stick of the device under study and non-linearity, which are present in the path, since the harmonics, which appear in the path due to nonlinearities, have correlation intervals multiple to the correlation interval of the OCHOI signal, and the delay time is chosen longer than the transition time. The resulting expression relates the measured autocorrelation coefficient at a fixed delay time, the rms value of the noise, and the rms value of the signal when compensating for the average values of both processes. or for the case of processes with zero means: -: Yach (niim. This expression can be represented as a relationship between the measured autocorrelation coefficient and the ratio of the media} 1 squared signal and noise values.

Пред м с т и 3 о б р е т е и и  Before m with t and 3 about b and e and and

Снособ измерении сред1 ек15адратич - ого значени  пе)исднче::кого сигнала, Среднеквадратичного ;начени  стационарного шума и,ч и отногне .ни  эти.х величин на вы.ходе исследуемого устройства с - омон1ью коррелометра, отличающийс  тем, что, е целью обеенечени  возможности изм ерени  указанных величин в услови х эксплуатации и устранени  вли ни  нереходных нронессов в устройстве, измер ют коэффициент автокоррел ции процесса на выходе устройства нри нреМени задержки большем, чем интервал )ел ции шума, но кратноМ интервалу -коррел ции Сигнала и большем, чем врем  установлени  нереходных процессов в устройстве, причем в случае измерени  Шума выходной процесс исследуемого устройства представл ет собой сумму неизвестного шума и известного вспомогательного нериодического сигнала , подаваемого на вход устройства, 5 с.тучае измерени  сигнала выходной процесс представл ет собой cyiMMy извеетного стационарного шума и неизвестного периодического сигнала и в случае нзмеренн  отношени  еигпала к выходной процесс представл ет собой сумму неизвестно1о стационарного шума и неизвестного периодического сигнала .The method of measurement of the mean square value of the baseline signal, the RMS signal, the onset of stationary noise, and the amount of these values at the output of the device under investigation is characterized by the fact that its goal is to the ability to measure these quantities under operating conditions and eliminate the influence of non-transient nroness in the device, measure the autocorrelation coefficient of the process at the output of the device and delay the delay more than the noise elimination interval, but a multiple of the signal correlation interval and longer than the time of establishing non-transitory processes in the device, and in the case of noise measurement, the output process of the device under study is the sum of the unknown noise and the known auxiliary non-periodic signal applied to the device input, 5 s. signal measurement the output process is cyiMMy known stationary noise and unknown periodic signal and in the case of the measured ratio of it to the output process is the sum of the unknown stationary noise and the unknown about a periodic signal.

SU640396A 1959-10-05 1959-10-05 The method of measuring the rms value of a periodic signal, the rms value of the stationary noise, or the ratio of these values SU129749A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471779A (en) * 1964-09-25 1969-10-07 Solartron Electronic Group Method and apparatus for testing dynamic response using chain code input function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471779A (en) * 1964-09-25 1969-10-07 Solartron Electronic Group Method and apparatus for testing dynamic response using chain code input function

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