Digital Signal Processing Reference
In-Depth Information
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(a)
(b)
Fig. 12.4. Basis vectors for an
eight-point DFT. (a) Real
components; (b) imaginary
components.
rates. This should not be surprising, since Euler's identity expands a complex
exponential as a complex sum of cosine and sine terms.
We now proceed with the estimation of the spectral content of both DT and
CT signals using the DFT.
12.3 Spectrum analysis using the DFT
In this section, we illustrate how the DFT can be used to estimate the spectral
content of the CT and DT signals. Examples 12.6-12.8 deal with the CT signals,
while Examples 12.9 and 12.10 deal with the DT sequences.
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