2006-07-02 20:46:37 · 12 answers · asked by jac 1 in Consumer Electronics ➔ Music & Music Players
FM
Frequency Modulation
Link: http://en.wikipedia.org/wiki/FM
AM
Amplitude Modulation
Link: http://en.wikipedia.org/wiki/Amplitude_Modulation
2006-07-02 20:51:42 · answer #1 · answered by Anonymous · 0⤊ 0⤋
FM=
Frequency Modulation
AM=
Amplitude Modulation
2006-07-03 05:31:04 · answer #2 · answered by Wizard158 3 · 0⤊ 0⤋
FM radio = that is a radio receiver able to receive FREQUENCY MODULATED emissions. What is Frequency modulation, right? Well, that is one way of transmitting sound over radio waves. As we know, sound can be translated in electric current by means of a microphone. The frequency of the current generated by the microphone is supposedly equal to that of the sound coming into the microphone. The frequency of the current generated by microphone (or CD, recorder, etc.) is added to the frequency of the CARRIER (the basic radio wave ) produced by the transmitter's oscillator. For instance, if we want to transmit a 2 KHz sound over a 86 MHz wave, this will result in a 86,2 MHz signal being transmitted. At the receiver, the process is reversed. The CARRIER frequency is substracted from the received signal and bingo! We get the sound that was transmitted.
AM modulation = the transmitted sound is used as an "envelope", causing the CARRIER's AMPLITUDE to increase and decrease following the oscillations of the transmitted wave. At the receiver, the demodulation process is extremely simple: it merely needs a semiconductor diode to extract the signal from the carrier.
As a matter of fact, an AM radio only needs an earphone, a diode and an antenna and ground wire to be operational. No bateries needed!
Hope i was clear!
2006-07-03 05:12:26 · answer #3 · answered by Kostagh 2 · 0⤊ 0⤋
Google "electromagnetic spectrum broadcast"
FM = Frequency Modulation
AM = Amplitude Modulation
It's a physics topic.
2006-07-03 03:49:09 · answer #4 · answered by changmw 6 · 0⤊ 0⤋
Fm- Frquency modulation. has low travelling ablity but has good clarity
Am- amplitude modulation has high traveling ability but not as clear as FM waves
2006-07-09 22:01:21 · answer #5 · answered by Anonymous · 0⤊ 0⤋
the FM/AM radio is a radio which has both AM and FM bands
2006-07-03 03:50:27 · answer #6 · answered by cubsfreak2001 5 · 0⤊ 0⤋
FM is frequency modulated signal, and doesn't travel as far as AM
AM is Amp modulated signal, and goes farther then FM
2006-07-03 03:51:30 · answer #7 · answered by lightningviper 4 · 0⤊ 0⤋
It has to do with the radio waves.
One differentiates between channels by the distance between peaks of the radio waves; the other differentiates between channels by the height of the radio waves.
Does that add anything?
2006-07-03 03:52:12 · answer #8 · answered by Paul G 2 · 0⤊ 0⤋
FM- FREQUENCY MODULATION
AM- AMPLITUDE MODULATION
2006-07-03 03:59:47 · answer #9 · answered by sunny d 1 · 0⤊ 0⤋
in the process of modulation,there are three parameters of signal:
am-amplitude modulation
FM:frequency modulation
pm:phase modulation
2006-07-03 03:58:04 · answer #10 · answered by micha ella brania 1 · 0⤊ 0⤋