Table of Contents
What is frequency modulation in radio?
Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing. For this reason, most music is broadcast over FM radio.
How do you modulate radio waves?
Modulation is the process by which a sound wave is added to a basic radio wave known as the carrier wave. For example, an audio signal can be electronically added to a carrier signal to produce a new signal that has undergone amplitude modulation (AM).
How does a radio modulator work?
Modulation is what takes a signal from low frequencies (the message) and pulls it up to a higher frequency (the carrier). The idea is simple: Multiply your message by a high frequency carrier, such as 680 kHz. Voila, that’s AM radio!
What produces radio frequency carrier wave?
The term carrier wave originated with radio. In a radio communication system, such as radio or television broadcasting, information is transmitted across space by radio waves. In the transmitter, an electronic oscillator generates a sinusoidal alternating current of radio frequency; this is the carrier wave.
What is the purpose of modulating a signal?
The carrier is higher in frequency than the modulation signal. The purpose of modulation is to impress the information on the carrier wave, which is used to carry the information to another location. In radio communication the modulated carrier is transmitted through space as a radio wave to a radio receiver.
What is difference between modulator and demodulator?
Difference Between Modulation and Demodulation Modulation is the process of influencing data information on the carrier, while demodulation is the recovery of original information at the distant end of the carrier. A modem is an equipment that performs both modulation and demodulation.
How are radio frequency waves generated?
Radio waves are generated by charged particles undergoing acceleration, such as time-varying electric currents. Naturally occurring radio waves are emitted by lightning and astronomical objects, and are part of the blackbody radiation emitted by all warm objects.
What are differences between frequency and phase modulation?
Difference between Frequency Modulation and Phase Modulation Frequency variation in FM and PM waves To understand the difference between FM and PM, we first consider the FM wave. Maximum frequency deviation The maximum frequency deviation in FM occurs at the point where the rate of change of modulating signal is maximum that means the maximum frequency corresponding Effect of modulating frequency
What is the advantage of frequency modulation?
(1) There is very low noise distortion and interference in Frequency Modulation.
What are the applications of frequency modulation?
Applications of FM (Frequency Modulation) (1) The Frequency Modulation technique widely used in FM Radio Broadcasting. (2) The Frequency Modulation technique also used in our computer Modems. (3) In Magnetic Tape Recording system, the Frequency Modulation technique is used. (4) The Frequency Modulation technique is used in Radio Detection And Ranging (RADAR) system.
What is modulation index formula in frequency modulation?
Equation for FM: V= A sin [ wct +Δf / fm sin wmt ] = A sin [ wct + mf sin wmt ] Equation for AM = Vc ( 1 + m sin ωmt ) sin ωct where m is given by m = Vm / Vc In FM, the Modulation Index can have any value greater than 1 or less than one In AM, the Modulation Index will be between 0 and 1 In FM, carrier amplitude is constant.