ada17 - ϖ± Ω Phase modulation • Suppose the phase...

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Periodogram of a sinusoid + spike Single high value is sum of sine curves all in phase at time t 0 :
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Periodogram of a sinusoid + white noise White noise is sum of sine curves with equal amplitude but random phases: NOTE THAT BOTH FLAT NOISE AND A SPIKE HAVE FLAT PERIODOGRAMS
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Amplitude modulation Suppose the amplitude of the oscillation changes sinusoidally with time: This produces sidelobes at
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Unformatted text preview: ϖ± Ω . Phase modulation • Suppose the phase increases at a rate that has a sine variation superposed: • This also gives sidelobes at ϖ± Ω but with different phases relative to those produced by amplitude modulation. Phase relations for sidelobes • Combined amplitude & phase modulation: • Frequency spectra: S( ϖ ) C( ϖ ) Amplitude modulation Phase modulation...
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