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DFT on a specified frequency

4.8 | 4 ratings Rate this file 5 Downloads (last 30 days) File Size: 2.04 KB File ID: #9891 Version: 1.0

DFT on a specified frequency


Hongxue Cai (view profile)


04 Feb 2006 (Updated )

spectral analysis (amplitude & phase) of recorded time-series data

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Compute the discrete Fourier transform at specified frequencies, not using fft.
Why one may need this?

(1) MATLAB fft function computes the amplitude of signals only (no phase).
(2) Once having the recorded time-series data, one often uses fft to do the spectral analysis. However, the frequency set at which you do the fft may not contain the specified frequency of interest. For example, when we use two primary tones (f1, f2) to stimulate the ear, we are interest in comptuting the distortion product at frequency of 2f1-f2. This frequency may not be inculuded in the frequency set for the fft analysis

MATLAB release MATLAB 7.0.4 (R14SP2)
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Comments and Ratings (7)
09 May 2013 know

know (view profile)

it's usefull. But how to reconstruct the data?

18 Dec 2007 Bilal Bakht

get back soon

Comment only
11 Sep 2007 Juan Bazo

11 Jul 2007 maysam soltanpour

filter and matlab toolbox

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11 Jul 2007 maysam soltanpour


Comment only
15 May 2006 Benny Lifschitz

a very good program. easy to work with and to anderstand.

12 Apr 2006 Benny Li

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