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Reason for the error which is inevitably present on the pw demodulated signal?
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Why three amplifiers are used in Tuned radio frequency receiver?
There are more than three amplifiers in a typical radio receiver. If, however, you are asking why there are three "stages" in the IF section, then the reason is that the IF section of a typical superhetrodyne receiver needs more bandwidth than can normally be provided by a single stage. As a result, there are usually three stages, each tuned slightly apart, so that you get a reasonable bandpass - otherwise, the demodulated signal will suffer.
What Distortion or unwanted noise in audio signal?
Noises present in audio signal may be of various kinds like environmental noises, transmission noises etc.
Why the received signal in analog communication is distorted by the channel noise than that of digital communication?
If an RF signal is AM modulated with a analogue signal any noise will add or subtract to the amplitude of the RF signal and will be present in the audio signal after detection, also will the noise add itself to the audio signal, where as in digital communication a slight variation in the amplitude of the signal is of no concern because you only work with ones and zeros, it's high or it's low
The small amount of ac signal present on the output of a filtering network for a dc power supply is known as?
Ripple.
Should a 24vdc circuit create arcing to use as a switch or signal?
Some voltage must be present but the current causes the arcing.
Why is amplitude of demodulated FM signal much less than modulated signal?
because demodulated FM is an audio signal, which the frequency is much smaller that is why it can be transmitted alone. It need carrier which has large frequency. Modulated signal is an audio signal + carrier that is why the amplitude is higher.
Explain quadrature null effect of coherent detector?
zero demodulated signal, which occurs for phase angle equal to + or - 90degrees, represent Quadrature Null Effect of the coherent detector.
How are electrical signals turned into data in microwave transmission?
This is usually done by modulating a much lower frequency carrier with the signal, then superheterodyning this carrier upconverting it into the desired microwave band. A corresponding superheterodyne receiver downconverts the microwave signal to a lower intermediate frequency which is then demodulated to recover the original signal.
Why is modulation necessary before multiplexing?
modulation means transmitting the signal which is to be transmitted along with the carrier wave, then at the receiver it is separated from the carrier and demodulated. So modulation is needed so as to transmit the signal over long distances with higher accuracy. Hence it is required before multiplexing.
How a radio program is broadcast and received?
The audio from the broadcast radio station is converted into a series of electro-magnetic radio waves via an aerial, which is receieved by the aerial in a radio and demodulated back into an audible signal again.
How radio program is broadcast and receive?
The audio from the broadcast radio station is converted into a series of electro-magnetic radio waves via an aerial, which is receieved by the aerial in a radio and demodulated back into an audible signal again.
What is FM threshold effect?
An important aspect of analogue FM satellite systems is FM threshold effect. In FM systems where the signal level is well above noise received carrier-to-noise ratio and demodulated signal-to-noise ratio are related by: The expression however does not apply when the carrier-to-noise ratio decreases below a certain point. Below this critical point the signal-to-noise ratio decreases significantly. This is known as the FM threshold effect (FM threshold is usually defined as the carrier-to-noise ratio at which the demodulated signal-to-noise ratio fall 1 dB below the linear relationship given in Eqn 9. It generally is considered to occur at about 10 dB).
Why harmonics present in a signal?
if a signal is not a pure sine wave it must contain harmonics
Data communication for signal characteristics?
past present and emerging developments in signal characteristics?
How is an analog signal used in a tv?
In standard definition TV sets, analog covers most anything picture related plus the audio, once the FM signal is demodulated. In the new HDTV (digital sets) about the only portion of the TV is the sound system once it's been separated from the digital audio stream.
Is demodulated carrier wave grounded in environment. if yes how. if no what happens to it?
During demodulation of AM the carrier beats with the sidebands reproducing the baseband signal. In other systems it is more complex, but in all the carrier is removed by the demodulator and baseband filter that follows the demodulator.
What is the use of connecting an integrator in delta modulation?
integrator converts the quantised signal to saw tooth signal which then compared with the present signal and error signal is generated,and error signal is quantised and the process continues
