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specwelch
This can calculate the spectrum for x using Welchs method. more>>
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)
Added: 2007-09-11 License: Freeware Price: Freeware
1 downloads
EKKOREAD
EKKOREAD allows you to import WinEkko ascii GPR data files with header info. more>>
EKKOREAD with its excellent features will surely help you if you use MatLab. It can actually import WinEkko ascii GPR data files with header info which is a WinEKKO Ground Penetrating Radar File (.as2).
Usage - example:
- [x,t,A] = EKKOREAD('FILE') reads an ascii Sensors & Software WinEkko export file (.as2 extension). Output values are:
-
- x: vector of trace positions in x direction.
- t: vector of travel times
- A: amplitude data array
- hdr: structure array of parameters from header file in field .name and .value (empty if no header file exists).
- EKKOREAD('FILE','HEADERFILE') uses the specified header file. Default = 'FILE.hd'.
Enhancements: 30 Jul 2007
- Fixed some typos in description and added keywords.
Requirements:
- MATLAB 7.2 (R2006a)
Added: 2007-08-13 License: Freeware Price: Freeware
1 downloads
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