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FIRWHITEN whitens the input time-series by building an FIR whitening filter. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% DESCRIPTION: FIRWHITEN whitens the input time-series by building an FIR whitening filter. The algorithm ultimately uses fir2() to build the whitening filter. ALGORITHM: 1) Make ASD of time-series 2) Perform running median to get noise-floor estimate (ao/smoother) 3) Invert noise-floor estimate 4) Call mfir() on noise-floor estimate to produce whitening filter 5) Filter data CALL: b = firwhiten(a, pl) % returns whitened time-series AOs [b, filts] = firwhiten(a, pl) % returns the mfir filters used [b, filts, nfs] = firwhiten(a, pl) % returns the noise-floor % estimates as fsdata AOs Parameters Description VERSION: $Id: firwhiten.m,v 1.30 2011/12/12 07:29:50 hewitson Exp $ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
| Method Details | |
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| Access | public |
| Defining Class | ao |
| Sealed | 0 |
| Static | 0 |
| Sets for this method … |
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| Default |
Default |
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| no description | |||
| Key | Default Value | Options | Description |
| NFFT | -1 | none | The number of points in the FFT used to estimate the power spectrum. If unspecified, this is calculated as Ndata/4. |
| BW | 20 | none | The bandwidth of the running median filter used to estimate the noise-floor. |
| HC | 0.80000000000000004 | none | The cutoff used to reject outliers (0-1). |
| WIN | 'BH92' |
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Spectral window used in spectral estimation. |
| ORDER | -1 |
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The order of segment detrending:
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| FIRWIN | 'BH92' |
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The window to use in the filter design. |
| NTAPS | 256 | none | The length of the FIR filter to build. |
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| Some information of the method ao/firwhiten are listed below: | |
|---|---|
| Class name | ao |
| Method name | firwhiten |
| Category | Signal Processing |
| CVS Version | $Id: firwhiten.m,v 1.30 2011/12/12 07:29:50 hewitson Exp $ |
| Min input args | 1 |
| Max input args | -1 |
| Min output args | 1 |
| Max output args | -1 |
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Method: ao/filtfilt | Method: ao/fixfs | ![]() |
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