What is Frequency Modulation?
admin In frequency modulation the variation in frequency of the carrier wave happens due to the instantaneous value of the modulating voltage. In this case the amplitude is made constant. The…
Physics
What is the difference between Amplitude modulation and frequency modulation?
1. In case of frequency modulation the change in amplitude may be due to noise. If we make use of amplitude limiters in FM receivers then we can completely vanish…
What is pulse modulation?
The transmission of analog data or speech which is in continuous form is known as pulse modulation. At some certain levels or points, the wave formation can be seen in…
What is Pulse Amplitude Modulation and Pulse time modulation?
In Pam each sample is directly proportional to signal amplitude. Generally it is used for the modulation of the carrier wave The part (a) of figure represents the modulating signal.…
What is demodulation?
This process is used in the receivers to recover the original signal coming from the sender end in modulating form. We can say that its function is opposite to that…
Explain data transmission and data retrieval?
The data transmission is done basically in the form of audio frequency. First it is converted into electrical signals. Then the process of signal filtration is done. After the filtering…
What is modem?
Modem is a device which is used to connect two computers with the help of ordinary telephone lines. Voltage changes are not tolerated by our ordinary telephone lines. This limitation…
Explain the working of the modems?
As we know that the computers can’t understand our language. Computers understand the language of 0’s and 1’s i.e. digital form. The modem will modulate the signal into a sine…
What is Fax?
FAX is basically a technique of reproducing a document electronically at a distant place. FAX machine is an example of digital communication system. Uses of a fax machine: (a) It…
What is space communication?
The receiving, sending and processing of information using space as a medium is called space communication. The information is sent in the form of sound waves. To send the information,…