Mind Peak WaveRider Manual de instrucciones descargar pdf (Pagina 51)

WaveRider Operating Manual

FFTS, DIGITAL FILTERS AND SIGNAL PROCESSING

The Fast Fourier Transform (FFT) is a mathematical prism. Just as a prism splits white light

into its component colors, an FFT splits a signal into its component frequencies. Another

perspective is that the FFT sorts a signal into a set of frequency bins. The WaveRider's FFT

sorts a signal into frequency bins one hertz wide.

An FFT takes a window or set of data points and converts this time window of data into a set

of frequencies. The input data is considered to be in the "time domain," the output data is in

the "frequency domain." The WaveRider uses a one second window. In the slow bars mode a

new window is begun every .25 seconds.

A digital filter performs a transfer function consisting of a collection of stop and pass bands.

Pass bands let specific frequencies pass. Stop bands stop certain frequencies from passing.

Most digital filters used in WaveWare have three bands, two stop bands and a pass band in

the middle. A digital filter also uses a window of data points. Unlike the FFT this window is

recalculated every time a new data point comes in. This makes digital filters much more

responsive to signal variations than FFTs.

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Mind Peak WaveRider Manual de instrucciones Pagina 51