Online Fast Fourier Transform (FFT) Tool

The Online FFT tool generates the frequency domain plot and raw data of frequency components of a provided time domain sample vector data. Vector analysis in time domain for complex data is also performed.

The FFT tool will calculate the Fast Fourier Transformof the provided time domain data as real or complex numbers.
A DSP design guide is provided to help understand the FIR filter design.

I use this tool to analyze captured data and design FIR filters. I hope it helps to you too. Enjoy...

There is no such thing as analog!

Input

Source Input Source Input Source may be a file, pattern, stream or a function. File Mode: Provide the time domain data file. The requirements for the time domain data file is described in file field help. Pattern Mode: Select one of the pregenerated pattern waves from the list. Stream Mode: Stream the data continuously. This is option available for a fee. Function Mode: Enter the function of time F(t). Eg. sin(3t)	File Pattern Stream Function
Time Domain Data File Time Domain Data File File may contain real or complex type sample values. Each sample should be in a new line. Each line contains one sample. Complex number real and imaginary parts are separated by comma character. Sample values should be in decimal format. A complex sample file may look like -1.332,3.22 2.55,-3.443 5.122,3.112 If real data is provided, the frequency spectrum will be mirrored on negative frequency as it will be identical. If complex data is provided fft will calculate and plot both negative and positive frequencies.
	1/4fs Real Sine wave 1/4fs Complex Sine wave -1/4fs Complex Sine wave -3/8fs Complex Sine wave 0.0212fs Complex Sine wave
Stream Spectrum Analyzer Stream function enables the Spectrum analyzer mode. It requires our wireless probe hardware. Contact me for streaming to the Online Spectrum analyzer functionality.	Disabled
F(t): Function Eg. sin(0.2*t)+(cos(0.5*t))**2 where t is the unit period.
Max Hold Max Hold Max hold
Verbose Verbose Verbose
Sampling Frequency Sampling Frequency Sampling Frequency is optional. If provided, it is used for normalizing the output spectrum plot. Has no affect in calculation.
Resolution Frequency Steps Number of FFT points (BINS) to be calculated Max number is limited to 512 to prevent CPU overloading. If you need a higher degree of calculation, please contact me.	16 32 64 128 256 512
Window Function Window Function Window Function is optional. This specifies the window function; if not given, no such function is used. Often for these purposes the data is partitioned into K segments, each containing 2M elements. The power spectrum for each segment is calculated, and the net power spectrum is the average of all of these segmented spectra. A problem that may arise in this procedure is leakage: the power spectrum calculated for one bin contains contributions from nearby bins. To lessen this effect data windowing is often used	None Bartlett Welch Hann
Output Output Format of the data to be displayed Analyzer: Plot the output data on an anlyzer window on screen. In Analzer format you may continue calculating new data and accumulating the results Raw Data: Output data is displayed as CSV format on screen. You may save this as a CSV file.	Analyzer Raw Data Display Raw Data Download
Calculation Time: 0 ms Print Time: 0 ms

Notes:
Internet Spectrum Analyzer Mode: Data can also be streamed to the server to have a continuous FFT which practically turns the page to an Online spectrum analyzer. Please contact me for this feature.

Internet Vector Signal Analyzer (VSA) Mode: Streamed data will be analyzed continuously as VSA.