Scaling the Filter Coefficients (Digital Filter Design Toolkit)
June 2008
NI Part Number:
371988B-01
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A filter structure consists of many accumulators. Each accumulator might use a different data range. However, the LabVIEW Digital Filter Design Toolkit provides only one sum quantizer QS> for all the accumulators. You can scale the filter coefficients before quantizing them to ensure that all the accumulators use the same data range. Scaling the filter coefficients can help you obtain a better filtering result, especially for IIR Cascaded Second-Order Sections Form structures. Use the DFD Scale Filter VI to scale the coefficients of a floating-point filter.
Refer to the Scale Filter before Targeting to FXP VI in the labview\examples\Digital Filter Design\Fixed-Point Filters\Single-Rate directory for an example that demonstrates how to scale the filter coefficients.
Resources
- Working with LabVIEW Filtering VIs and the LabVIEW Digital Filter Design Toolkit VIs- Developer - NI Developer Zone
- Designing Filters Using the NI LabVIEW Digital Filter Design Toolkit- Developer Zone - NI Developer Zone
- Teaching FIR Filter Design Using the Digital Filter Design Toolkit (Windowing)- Developer Zone - NI Developer Zone