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Q: What is the effect of time constant in envelope detector?
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Explain about the effect of the time constant RC in envelope detector?

The circuit that generates signal having the shape like imaginary curve is called an envelope detector. The effect of the time constant RC in envelope detector is that the output follows the input curve and the circuit performs like a demodulator.


What is meant by non constant envelope modulation?

A constant-envelope modualtion is a modualtion scheme in which the amplitude of the modualted tone remains constant with time. Main advantage of such modualtion schmes is that they relax the linearity requirements of the power amplifier (PA) and hence a less linear and more efficient PA can be used. Most modualtion schemes are not constant-envelope. For example, BPSK, QPSK, 16-QAM are not constant-envelope. Few modualtion schemes such as GFSK are constant-envelope.


What is diagonal clipping in AM demodulation?

The diagonal clipping in Amplitude Demodulation (using envelop detector) can be avoided if RC time-constant of the envelope detector satisfies the following condition, where W is message bandwidth and w is carrier frequency both in rad/sec: The time contant t should be always in between ( 1/w) and ( 1/W) [without including ( 1/w) and ( 1/W) ]


Can you give a sentence using the word constant?

The passage of time has a constant erosive effect.


Is time constant throughout the universe?

no due to difference of mass. see effect of gravity/velocity on time


What is resolving time in GM counter?

The resolving time or dead time of a detector is the time it takes for the detector to reset.


How envelope is eliminated and sine wave is produced in demodulation?

One way to demodulate an amplitude modulated signal from its carrier is to build a peak-follower. This could be a simple RC filter with a diode at the input. The voltage across the capacitor would charge to the peak value of the carrier (envelope), and then discharge through the resistor. The time constant would be selected so that the capacitor would have no "trouble" following the envelope. Since the typical ratio of signal to carrier frequency is quite high, i.e. 20kHz signal vs 1MHz carrier, the time constant can be quite short.


Does the length of time that a force acts on an object that have any effect on the strength of the impulse produced explain?

Yes, it does. Assuming a constant force, the impulse is equal to the force multiplied by the time the force acts. (If it isn't constant, you will of course use an integral instead.)


What is acoustic envelope?

An acoustic envelope is a graph that describes the pitch, volume or other such parameters of a sound over time.


Do pH levels change over time?

Factors like decomposition and absorption of gas from the atmosphere can effect pH. Because these factors are rarely constant, pH will change over time.


What does retention time mean?

The retention time represents the time it takes to an analyte to pass from the column inlet to the detector.


How do you calculate the time constant in a series resistor?

A resistor by itself has no time constant. For a circuit to have a time constant it must contain either capacitors or inductors.