DFD IIR Notch Peak Design VI

LabVIEW 2011 Digital Filter Design Toolkit Help

Edition Date: June 2011

Part Number: 371325F-01

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Owning Palette: Special Filter Design VIs

Requires: Digital Filter Design Toolkit

Designs a notch or peak filter in which the notch or peak is located at the center frequency. You must manually select the polymorphic instance you want to use.

Examples

Use the pull-down menu to select an instance of this VI.

DFD IIR Notch Peak Design By Q Factor

filter type specifies the type of filter that this VI creates.

0Notch (default)
1Peak
f0 specifies the center frequency of the notch or peak in hertz. The value of f0 must be greater than 0 but less than half the value of fs. The default is 0.10.
Q factor specifies the Q factor of the filter, which equals the quotient of center frequency and corresponding bandwidth. The default is 20. The Q factor reflects the relative sharpness of the filter notch or peak. Increasing the Q factor sharpens the notch or peak.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
fs specifies the sampling frequency in hertz. The value must be greater than zero. The default is 1, which is the normalized sampling frequency.
filter out returns a new filter.
error out contains error information. This output provides standard error out functionality.

DFD IIR Notch Peak Design By Bandwidth

filter type specifies the type of filter that this VI creates.

0Notch (default)
1Peak
f0 specifies the center frequency of the notch or peak in hertz. The value of f0 must be greater than or equal to 0 but less than half the value of fs. The default is 0.10.
Df defines the full bandwidth at the level of –Ab in hertz. The default is 0.02. Df represents f.
Ab specifies the attenuation, in decibels, that corresponds to the bandwidth. The default is 3.0103, which corresponds to 3 dB bandwidth, the commonly used bandwidth of a filter.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
fs specifies the sampling frequency in hertz. The value must be greater than zero. The default is 1, which is the normalized sampling frequency.
filter out returns a new filter.
error out contains error information. This output provides standard error out functionality.

Examples

Refer to the following VIs for examples of using the DFD IIR Notch Peak Design VI:

  • IIR Notch Peak Filter Design VI: labview\examples\Digital Filter Design\Floating-Point Filters\Conventional
  • Noise Cancellation for ECG Signal by Notch Filter VI: labview\examples\Digital Filter Design\Floating-Point Filters\Conventional

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