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can we distinguish AM or FM by looking the waveform
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anup dhital



Joined: 16 Jun 2005
Posts: 19
Post22 Feb 2008 6:34   

can we distinguish AM or FM by looking the waveform
Is it possible to distinguish AM or FM modulated signal by looking at the waveform?
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toonafishy



Joined: 18 Jun 2002
Posts: 461
Helped: 25
Location: Earth
Post22 Feb 2008 6:59   

Re: can we distinguish AM or FM by looking the waveform
Yes - if you look on an oscilloscope, the amplitude (envelope) of the waveform will vary in AM but is constant in FM. Also, in AM, the phase of the waveform is constant (the waveform is varying at the rate of the carrier frequency). In FM, you will see the phase vary.
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