Fourier Analysis

Produces the Fourier analysis of a data set by computing the Discrete Fourier Transform (DFT) of an input array of complex numbers using a couple of Fast Fourier Transform (FFT) algorithms.

Para aceder a este comando...

From the menu bar:

Choose Data - Statistics - Fourier Analysis

From the tabbed interface:

Choose Data - Statistics - Fourier Analysis.

On the Data menu of the Data tab, choose Statistics - Fourier Analysis.


note

For more information on Fourier analysis, refer to the corresponding Wikipedia article.


Dados

Intervalo de entrada: a referência do intervalo de dados a analisar.

Intervalo de saída: a referência da célula ou intervalo em que os resultados serão mostrados.

Input range has label: Mark when the first row or column of the input array is actually a label and not part of the data analysis.

Input Range is a 2 x N or N x 2 range representing an array of complex number to be transformed, where N is the length of the array. The array represents the real and imaginary parts of the data.

Agrupar por

Selecione se os dados de entrada estão dispostos em colunas ou linhas.

Options:

Inverse: When checked, calculates the inverse Discrete Fourier Transform.

Polar: When checked, the results are in polar coordinates (magnitude, phase).

Minimum magnitude for polar form output (in dB): used only when output is in polar form. All frequency components with magnitude less than this value in decibels will be suppressed with a zero magnitude-phase entry. This is very useful when looking at the magnitude-phase spectrum of a signal because there is always some very tiny amount of rounding error when doing FFT algorithms and results in incorrect non-zero phase for non-existent frequencies. By providing a suitable value to this parameter, these non-existent frequency components can be suppressed.

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Exemplos

The source data for this example is the same of the FOURIER function page.

Fourier Transform

Fourier Transform

Input data range : $B$6:$C$40

Input data range : $B$6:$C$40

Real

Imaginary

Magnitude

Phase

17.1775578743134

3.88635177703826E-15

17.1775578743134

2.26245884628906E-16

3.428868795359

2.37164790000189

4.16915518748944

0.605113892937279

-6.80271615433369

-15.1345439297576

16.5931120359682

-1.99322000923881

-1.605447356601

-5.08653060378972

5.33387802617444

-1.87652762269615

0.395847917447356

-2.41926785527625

2.45143886917874

-1.40861048708919

-1.49410383304833

-2.39148041275

2.81984482347817

-2.12922380028329

0.87223579298981

-1.14394086206797

1.43853952829993

-0.919353665468368

1.5332458505929

0.678159168870983

1.6765269746366

0.416434654153369

0.450563708411459

0.22911248792634

0.505470263676592

0.470425948779898

0.545106616940358

0.411028927740438

0.682704916689207

0.646077879418302

2.22685996425193

-2.43092236748302

3.29670879167654

-0.829181229907427

-1.61522859107175

-2.41682657284899

2.90689079338124

-2.15994697868441

1.30245078290168

1.45443785733126

1.95237484175544

0.840472341525344

1.57930628561185

-1.33862736591677

2.07029745895472

-0.70310180067089

-1.07572227365276

-0.921557968003809

1.41649126309482

-2.43322886402899

-0.055782417923803

-1.81336029451831

1.81421807837012

-1.60154853447151

-0.577666040004067

1.38887243891951

1.50421564456836

1.96495487990047

-0.826878282157686

-0.186591000796403

0.847669685126376

-2.91965280961949

-0.826878282157715

0.186591000796416

0.847669685126408

2.91965280961948

-0.577666040004051

-1.38887243891954

1.50421564456838

-1.96495487990045

-0.055782417923785

1.81336029451832

1.81421807837012

1.6015485344715

-1.07572227365276

0.921557968003802

1.41649126309482

2.433228864029

1.57930628561187

1.33862736591678

2.07029745895474

0.703101800670888

1.3024507829017

-1.45443785733125

1.95237484175543

-0.840472341525331

-1.61522859107176

2.416826572849

2.90689079338125

2.15994697868441

2.22685996425191

2.43092236748304

3.29670879167653

0.829181229907435

0.545106616940365

-0.411028927740441

0.682704916689214

-0.646077879418299

0.450563708411458

-0.229112487926344

0.505470263676594

-0.470425948779905

1.53324585059292

-0.678159168870965

1.6765269746366

-0.416434654153355

0.872235792989797

1.14394086206799

1.43853952829994

0.919353665468386

-1.49410383304834

2.39148041275001

2.81984482347818

2.12922380028329

0.395847917447327

2.41926785527626

2.45143886917875

1.4086104870892

-1.60544735660102

5.08653060378972

5.33387802617445

1.87652762269616

-6.80271615433379

15.1345439297575

16.5931120359682

1.99322000923882

3.42886879535907

-2.37164790000194

4.16915518748952

-0.605113892937279


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