signal.WindowFunctions.Interface.WindowFunctionDescr

dsp-collection / signal/WindowFunctions / WindowFunctionDescr

Interface: WindowFunctionDescr

Window function descriptor.

Properties

cpuCost

cpuCost: number;

Relative complexity of computation.

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f

f: WindowFunction;

Non-normalized window function.

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firstMinPos

firstMinPos: number;

Relative frequency position of the first minimum.

For most window functions the first minimum is a null in the spectrum or a zero in the filter transfer function. But for the parabolic window, it's only a local minimum and not a null/zero. In the sprectrum, the frequency is relative to the window size (DFT bin, normalized frequency). When used as a filter, the frequency is relative to the FIR kernel size. Formula for FIR filters:

firstMinFrequency = firstMinPos * sampleRate / firKernelWidth

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fNorm

fNorm: WindowFunction;

Gain-normalized window function.

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id

id: string;

Internal ID of the window function.

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name

name: string;

Descriptive name.