specwelch
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specwelch Ranking & Summary
File size:
Platform:
Linux / Mac OS / BSD / Solaris
License:
Freeware
Price:
Freeware
Downloads:
21
Date added:
2007-09-11
Publisher:
Alex Sanchez
specwelch description
specwelch is a small yet useful script for everyone. It can calculate the spectrum for x using Welchs method. The confidence intervals are calculated using the inverse of chi-square CDF. Also includes a filtering option using the butterworth filter to see the effect of the filter on the spectrum.
Usage:
- q = specwelch(x,dt,w,Nsg,pnv,Wn,ftype,n)
- [psdf,f] = specwelch(x,dt,w,Nsg,pnv,Wn,ftype,n)
- [psdf,conf,f] = specwelch(x,dt,w,Nsg,pnv,Wn,ftype,n)
Input Var:
- x - Time series, [vector]
- dt - Sampling Rate, [scalar]
- win - Window, one of: hanning, hamming, boxcar
- Nsg - Number of Segments (>=1)
- pnv - Percentage Noverlap of Segments (0-100)
- Nb - Band Averaging, number of bands to average
- Wn - Cut-Off frequencies, used for filtering
- ftype - Type of filter, high, low or stop
- n - Number of coefficients to use in the Butterworth filter
Output Var:
- q - structure with the following fields:
- xp - detrended x
- f = Frequencies
- T - Periods
- m - Magnitude
- a - Amplitude
- s - Power spectrum, Sxx(win), [Power]
- psdw - Power Spectral Density, Pxx(win), [Power/rad/sample]
- psdf - Power Spectral Density, Pxx(f), [Power/sample-freq]
- psdT - Power Spectral Density, Pxx(T), [Power*time-unit]
- conf - Upper and Lower Confidence Interval multiplication factors using chi-squared approach.
Requirements:
- MATLAB 7 (R14)
specwelch Screenshot
specwelch Keywords
Power spectral density
specwelch
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spectrum
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processing
matlab specwelch
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specwelch Copyright
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