SU779922A1 - Device for measuring amplitude modulation coefficient in wide range of modulating frequencies - Google Patents
Device for measuring amplitude modulation coefficient in wide range of modulating frequencies Download PDFInfo
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- SU779922A1 SU779922A1 SU782598506A SU2598506A SU779922A1 SU 779922 A1 SU779922 A1 SU 779922A1 SU 782598506 A SU782598506 A SU 782598506A SU 2598506 A SU2598506 A SU 2598506A SU 779922 A1 SU779922 A1 SU 779922A1
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- USSR - Soviet Union
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- wide range
- amplitude modulation
- modulation coefficient
- modulating frequencies
- measuring amplitude
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Description
Исследуемый AM сигнал демодулцруют демодул тором 1, с выхода демодул тор 1 низкочастотное напр жение подают на фазовращатель 2 и фильтр 3, где подавл ют гармоники этой частоты, возникшие при демодул ции AM сигналов. С выхода фильтра 3 низкочастотное напр жение подают на аттенюатор 4, а с его выхода на вспомогательный ЧМ генератор 5, с помощью которого форми руют вспомогательный ЧМ сигнал, и ЭС 11 дл измерени модулирующей частоты вспомогательного ЧМ сигнала С помощью фазовращател 2 и аттенюатора 4 регулируют девиацию частоты (индекс модул ции) ЧМ сигнала и фазу модулирующего напр жени . AMсигнал с определ емым коэффициентом AM подают также на преобразователь 6, .где его смешивают со вспомогательным ЧМ сигналом, от генератора 5. Компоненты с разностной частотой выдел ют фильтром нижних частот 7 и подают на анализатор спектра 8. Подбором фазы модулирующей функции ЧМ сигнала и девиации частоты (индекс модул ции) обращают в нуль спектральную составл ючто дает возможность св зать гп и р, Далее девиацию частоты умножают с по мощью .умножител 10 до таких значеНИИ , чтобы Jb было больше 10 и после обработки измер ют J ЭС 11 и вычисл ют т . Работу устройства можно по снить с помощью математических выражений. Входной AM сигнал и U,l+fncobat smu),t, преобразуют с помощью ЧМ сигнала и UjStn uOjt JbSiM(9rt: ). Низкочастотную составл ющую с выхода преобразовател 6 Uj Uj 1+m cos r(Wj-iO,)t+p,sinflH+4) (i) подают на анализатор спектра 8. Дл установлени фуйкциональной св зи ме ду w и Jb используют свойство спек .тра, заключающеес в том, что при - О спектр сигнала (1) приобретает простой вид U --U/|jr Jb)(l))i. (2) где Из формулы (2) следует, что при К О Iklm. К.-та спектральна составл юща обращаетс в нуль, т.е. ( дл определени m остаетс fkl . измеритель /Ь . Этот параметр измер ю элёктронно-счетным частотомером. The investigated AM signal is demodulated by demodulator 1, from the output of demodulator 1, low-frequency voltage is applied to phase shifter 2 and filter 3, where they suppress the harmonics of this frequency that occurred during demodulation of AM signals. From the output of the filter 3, the low-frequency voltage is applied to the attenuator 4, and from its output to the auxiliary FM generator 5, with which an auxiliary FM signal is formed, and ES 11 to measure the modulating frequency of the auxiliary FM signal With a phase shifter 2 and an attenuator 4 they regulate the deviation frequency (modulation index) of the FM signal and the phase of the modulating voltage. An AM signal with a definable AM factor is also fed to a transducer 6, where it is mixed with an auxiliary FM signal, from generator 5. Components with a differential frequency are extracted with a low-pass filter 7 and fed to a spectrum analyzer 8. Phase selection of the modulating function of the FM signal and deviation the frequencies (modulation index) vanish the spectral component that allows you to connect hp and p. Next, the frequency deviation is multiplied with the aid of multiplier 10 to such values that Jb is greater than 10 and, after processing, J ES 11 is calculated and calculatedt. The device can be operated using mathematical expressions. The input signal AM and U, l + fncobat smu), t, is converted using the FM signal and UjStn uOjt JbSiM (9rt:). The low-frequency component from the output of the converter 6 Uj Uj 1 + m cos r (Wj-iO,) t + p, sinflH + 4) (i) is fed to the spectrum analyzer 8. To establish a fuctional connection between w and Jb, the spec .tra, which implies that as - О the spectrum of the signal (1) takes the simple form U --U / | jr Jb) (l)) i. (2) where From formula (2) it follows that when K O, Iklm. The K.-that spectral component vanishes, i.e. (to determine m, fkl. meter / b remains. This parameter is measured by an electron-counting frequency meter.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782598506A SU779922A1 (en) | 1978-03-19 | 1978-03-19 | Device for measuring amplitude modulation coefficient in wide range of modulating frequencies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782598506A SU779922A1 (en) | 1978-03-19 | 1978-03-19 | Device for measuring amplitude modulation coefficient in wide range of modulating frequencies |
Publications (1)
Publication Number | Publication Date |
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SU779922A1 true SU779922A1 (en) | 1980-11-15 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SU782598506A SU779922A1 (en) | 1978-03-19 | 1978-03-19 | Device for measuring amplitude modulation coefficient in wide range of modulating frequencies |
Country Status (1)
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SU (1) | SU779922A1 (en) |
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1978
- 1978-03-19 SU SU782598506A patent/SU779922A1/en active
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