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DFT on a specified frequency

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04 Feb 2006 (Updated )

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

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Description

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

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

18 Dec 2007 Bilal Bakht

get back soon

11 Sep 2007 Juan Bazo  
11 Jul 2007 maysam soltanpour

filter and matlab toolbox

11 Jul 2007 maysam soltanpour

filtering-coding-signaling

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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