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Engineering
Electrical Engineering
Amplitude modulation of signals with [suppressed] carrier
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[QUOTE="the_emi_guy, post: 5492882, member: 415127"] It's often easier this consider these in the frequency domain. Assuming sinusoidal modulation, in the suppressed carrier case we simply have two pure tones (the sidebands) beating against each other. They could be, for example, 0.99MHz and 1.01MHz. Your Case I waveform could just as easily be representing two sound waves, close in frequency, beating against each other producing the wowwwow sound (say 499Hz and 501Hz). In the second case there are three pure tones, the two sidebands, and the carrier which is centered in between the sidebands in frequency, (0.99MHz, 1MHz, 1.01MHz). You can see the carrier tone in the Case II waveform. There are lots of references online describing the relevant math and the methods used to generate, for example: [URL]https://en.wikipedia.org/wiki/Double-sideband_suppressed-carrier_transmission[/URL] In a simplified nutshell we can generate both of these by multiplying (with a mixer) the carrier tone (1MHz) with a modulation tone (10KHz) that is appropriately offset in amplitude. In the case of suppressed carrier the offset is zero [cos(ω[SUB]m[/SUB]t)*cos(ω[SUB]c[/SUB]t)]. In the case of AM the offset is necessary [1+ cos(ω[SUB]m[/SUB]t)]*cos(ω[SUB]c[/SUB]t)]. [/QUOTE]
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Amplitude modulation of signals with [suppressed] carrier
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