What is Overmodulation? - Electrical Engineering Stack Exchange
100% modulation depth, the sine envelope touch at y=0. Maximum modulation that can be retrieved with an envelope detector without distortion; > 100% modulation depth, "overmodulation", the original sine wave can no longer be detected with an envelope detector. A still overview of the most important modulation depths (0, 50, 100 and 200%):
modulation - How to demodulate an overmodulated signal?
2014年3月31日 · 1 Answer. Sorted by: This signal is half way between regular AM modulation (for broadcasting music) and full double-sideband-suppressed-carrier. Because there is still carrier present you can filter this out to give a constant amplitude sine wave at only the carrier frequency. Use this sine wave and the original "over-modulated" signal and feed ...
transistors - Amplitude modulation with JFET - Electrical …
2021年1月29日 · For my message signal I used an AC amplitude of 0.5 V and I also gave a DC bias of -1.7 V to the gate of the JFET. The frequency of the AC is 500 Hz. For the carrier I used a 40 kHz AC signal of 0.5 V amplitude. I noticed that if I play a little with the DC bias (close to the threshold voltage of -1.71 V) it changes the output noticeably and ...
pwm - SinePWM - Electrical Engineering Stack Exchange
2021年3月20日 · Reason: The maximum peak voltage is always measured to a "virtual" neutral point of the DC link capacitor split in half. E.g. the maximum peak voltage (with mi = 1.0 - no overmodulation) is V_an_pk = Vdc / 2. From this value you can calculate RMS Line-Neutral voltage easily. Line-to-Line rms voltage is then V_LL_rms = sqrt(3) * V_an_rms
amplifier - What is transient intermodulation distortion? - Electrical ...
2015年2月23日 · 7. Transient Intermodulation distortion (TIM) is usually measured by putting a burst of a fixed frequency into a amplifier and then measuring what actually comes out. By Fourier analisys, you can see that changing amplitude of a frequency actually implies additional frequencies. This is why AM radio stations can't be spaced too close together.
Why, where and how we use envelope detector in AM …
2016年10月23日 · An envelope detector is the cheapest and fastest way to demodulate an AM signal. simulate this circuit – Schematic created using CircuitLab
AM modulation depth and phase addition [duplicate]
Overmodulation ,means that on negative modulation peaks the carrier goes hits 0. Share. Cite. Follow ...
rf - Signal multiplication in AM transmitter circuit - Electrical ...
2018年6月29日 · At +ve peaks, this adds to the 9V, so we get +12V on the transmitter, and the RF amplitude goes up. On negative peaks, we get 4V on the transmitter, and the RF amplitude drops. The level of the AC is set to get enough modulation. At some voltage >0, the RF output drops to 0. At this point we get overmodulation.
Over Amplitute Modulation vs DSB_SC Modulation
2020年12月12日 · When the low-frequency modulating signal (in green) passes through zero, the carrier undergoes a 180 degree phase inversion. The signal below is DSB, (with phase inversions), while yours appears to have no phase inversion. If you applied this waveform to a 4-quadrant multiplying demodulator, you'd get a very different baseband signal out.
Does an AM radio wave make use of a lower side band?
2022年12月29日 · \$\begingroup\$ Amplitude modulation preserves information about the phases of the components in the modulated signal, which is not preserved in SSB modulation.