
ifilter: Interactive Fourier filter function 3 File ID: 83158 


 ifilter: Interactive Fourier filter function 3 License: Shareware File Size: 10.0 KB Downloads: 13
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ifilter: Interactive Fourier filter function 3 Description 

Description: ifilter(x,y) or ifilter(y) or ifilter([x y]) or ry=ifilter(x,y,center,width,shape,plotmode,filtermode) Keyboardoperated interactive Fourier filter function for timeseries signal (x,y), with keyboard controls that allow you to adjust the filter parameters continuously while observing the effect on your signal dynamically. Optinal input arguments set the intital values of center frequency, filter width, shape, plotmode (1=linear; 2=semilog frequency; 3=semilog amplitude; 4=loglog) and filtermode ('Bandpass','Lowpass', 'Highpass', 'Bandpass', and 'Bandreject (notch)'). Returns the filtered signal. Press K to list keyboard commands. T. C. O'Haver (toh@umd.edu), Version 3 adds X key to switch between frequency and period x scale on power spectrum plot.
Example 1: x=0:100;y=sin(x);ifilter(x,y);
Example 2 uses optional input arguments to set intital values: x=0:(1/8000):.3; y=(1+12/100.*sin(2*47*pi.*x)).*sin(880*pi.*x)+(1+12/100.*si(2*20*pi.*x)).*sin(2000*pi.*x); ry=ifilter(x,y,132,31,18,3,'Bandpass');
KEYBOARD CONTROLS when figure window is topmost: Adjust center frequency.......Coarse: < and > Fine: left and right cursor arrows Adjust filter width...........Coarse: / and " Fine: up and down cursor arrows Filter shape..................A,Z (A more rectangular, Z more Gaussian) Filter mode...................B=bandpass; N or R=notch (band reject) H=Highpass; L=Lowpass Select plot mode..............1=linear; 2=semilog frequency 3=semilog amplitude; 4=loglog Print keyboard commands.......K Pints this list Print filter parameters.......Q Prints input argumentsy: center,width,shape,plotmode,filtermode Print current settings........T Prints list of current settings Switch SPECTRUM Xaxis scale..X switch between frequency and period x scale on POWER SPECTRA Switch OUTPUT Yaxis scale....Y switch between fixed or variable y scale on output plot Play output as sound..........P or Enter Save output as .mat file......S
License: Shareware Related: Filter, shapeaz, widthcoarse, arrows, Cursor, rectangular, gaussian, dhighpass, dlowpass, reject, Ifilter O/S:BSD, Linux, Solaris, Mac OS X File Size: 10.0 KB Downloads: 13


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