FL10quiz24 - G ω in terms of F ω c What is the principal...

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ESE 351 Quiz 24 Name: 12/2/10 Section 13.5–13.8 a. With your stereo system, you can hear the left-speaker sound from your left speaker and the right-speaker sound from your right speaker. The FM radio stations in the US do not broadcast the right-speaker signal, r ( t ), and the left-speaker signal, ( t ), separately. Rather, they broadcast the sum, a ( t ) = r ( t ) + ( t ), of the two signals and the difference, b ( t ) = r ( t ) - ( t ), of the two signals separately. Why is it done this way? b. Amplitude modulation takes place when a sine wave, sin ω 0 t , is modulated by a signal f ( t ) and creates a new signal g ( t ) = f ( t ) sin ω 0 t . What happens to the frequency spectrum F ( ω ) of f ( t )? Express
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Unformatted text preview: G ( ω ) in terms of F ( ω ). c. What is the principal advantage of the single-sideband amplitude modulation over the double-sideband amplitude modulation? d. It is possible to recover the original continuous-time signal f ( t ) from its sampled values so long as the sampling rate is fast enough. What is the name of the sampling rate which spells out the lowest limit of such a sampling rate? e. In a western movie, the wheels of a stage coach sometimes do not appear to rotate at the correct speed or even in the correct direction. What name is given to this phenomenon?...
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