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VarWindow (FPScript)

21.09.2021

Creates a data taper compatible with a data set.

Syntax

VarWindow(Signal, Window [ , Adjustment ])

 

The syntax of the VarWindow function consists of the following parts:

Part

Description

Signal

The data set that specifies the sampling for the data window to be calculated. If you specify a signal or signal series, then its X component is used.

Permitted data structures are data series, data matrix, signal und signal series. All numeric data types are permitted.

If the argument is a list, then the function is executed for each element of the list and the result is also a list.

Window

The fixed or adjustable data window to be generated.

The argument Window can have the following values:

Constant

Meaning

WIN_RECTANGULAR

Rectangular -13 dB (no windowing, width=1)

WIN_WELCH

Welch -21 dB (fixed width=1.4)

WIN_SINE

Sine -23 dB (fixed width=1.5)

WIN_BISQUARE

Bi-Square or Connes -28 dB (fixed width=1.8)

WIN_BARTLETT

Bartlett -27 dB (fixed width=2)

WIN_HANNING

Hanning Max. Rolloff -31 dB (cosine, order 2, fixed width=2)

WIN_TUKEYHANN O

Tukey-Hann -37 dB (fixed width=2)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_BARTLETTMOD O

Modified Bartlett -39 dB (fixed width=2.3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_HAMMING

Hamming Min. Sidelobe -43 dB (cosine, order 2, fixed width=2)

WIN_COS3MAXROLLOFF O

C3 Max. Rolloff -47 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS3BLACKMAN

Blackman -58 dB (cosine, order 3, fixed width=3)

WIN_COS3BHARRIS62 O

Blackman-Harris -62 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS3NUTALL O

C1 Nutall -64 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS3BLACKMANEXACT O

Blackman Exact -68 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS3BHARRIS68 O

Blackman-Harris -68 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS3MINSIDELOBE O

Nutall -71 dB (cosine, order 3, fixed width=3)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4MAXROLLOFF O

C5 Max. Rolloff -61 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4BHARRIS74 O

Blackman-Harris -74 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4NUTALL83 O

C3 Nutall -83 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4BHARRIS92 O

Blackman-Harris -92 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4NUTALL93 O

C1 Nutall -93 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COS4NUTALL96 O

Nutall -96 dB (cosine, order 4, fixed width=4)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_FLATTOP

Flattop -68 dB (cosine, order 5, fixed width=5)

WIN_BETA O

Beta, Max. Rolloff (adjustable width=1.5-6)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COSMAXROLLOFF O

Cosine Max. Rolloff (adjustable width=1.5-6)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_KAISERBESSEL

Kaiser-Bessel (fixed width=3, adjustable width=1.5-6 with the Spectral Analysis option installed)

WIN_VANDERMAAS O

VanderMaas (adjustable width=1.5-6)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_CHEBYSHEV O

Chebyshev (adjustable width=1.75-5.75)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_CHEBYSHEVAPPROX O

Chebyshev Approx. (adjustable width=2.1-5)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_SLEPIAN O

Slepian DPSS-1 (adjustable width=2-5)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_GAUSS O

Gaussian (adjustable width=2-6)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

WIN_COSTAPER O

Tapered Cosine (adjustable width=1-2)

O This constant requires the option Order Tracking or the option Spectral Analysis to be licensed.

If the argument is a list, then the first element in the list is taken. If this is also a list, then the process is repeated.

Adjustment

The one-sided Fourier width as a multiple of the frequency interval. The valid range is window specific. The default is 1.5 for a tapered cosine window and 3.0 for all other adjustable data windows.

Permitted data structures are scalar value. All real data types are permitted.

If the argument is a list, then the first element in the list is taken. If this is also a list, then the process is repeated.

Remarks

The result has the same structure as the argument Signal.

The Y component is replaced by the computed data taper, the X and Z components, if present, are copied into the result without modification.

Available in

Option Spectral Analysis

Examples

Dim x = Log10((100,1,1))
VarWindow(Signal(x,x), WIN_TUKEYHANN)
 

Generates a Tukey-Hann window from the logarithmic data. The X component is copied into the result.

See Also

ApplyWindow Function

DataWindow Function

FFTn Function

Spectral Analysis Option

Data Tapering Window

Fourier Spectral Analysis

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