FIR_Coef
Advanced Analysis Library Only
AnalysisLibErrType FIR_Coef (int type, double samplingFrequency, double lowerCutoffFreq, double upperCutoffFreq, int numberOfCoefficients, double *firCoefficientArray);
Purpose
Generates a set of FIR filter coefficients based on the window design method. FIR_Coef returns the coefficients as the truncated impulse response of an ideal frequency response of the selected filter type.
Use Convolve to achieve the actual filtering.
Parameters
| Input | ||
| Name | Type | Description |
| type | int | Controls the filter type of the FIR filter coefficients to design. type has the following valid values: lowpass = 0 (default) highpass = 1 bandpass = 2 bandstop = 3 |
| samplingFrequency | double | Sampling frequency in Hertz. |
| lowerCutoffFreq | double | Lower cutoff frequency in Hertz. |
| upperCutoffFreq | double | Upper cutoff frequency in Hertz. |
| numberOfCoefficients | int | Length of the FIR filter. |
| Output | ||
| Name | Type | Description |
| FIRCoefficientArray | double | Calculated output window FIR filter coefficients. |
Return Value
| Name | Type | Description |
| status | AnalysisLibErrType | A value that specifies the type of error that occurred. Refer to analysis.h for definitions of these constants. |
Additional Information
Library: Advanced Analysis Library
Include file: analysis.h
LabWindows/CVI compatibility: LabWindows/CVI 3.1 and later