Abstract
We propose a new design method for FIR digital filters with arbitrary passband by using interpolation techniques. Interpolated FIR (IFIR) filters have a sparse impulse response with every Lth sample being nonzero and can be implemented by replacing each delay of an original filter with L delays. We call L the interpolation ratio. L is an integer. Then the frequency band is reduced to 1/L. To implement a desired passband, the IFIR filter requires only 1/L multipliers of the direct form FIR digital filter. Using this method it is possible to implement a narrowband filter with fewer than 30 percent multipliers of the direct form, and a wideband lowpass filter with fewer than 40 percent multipliers.
| Original language | English |
|---|---|
| Pages (from-to) | 6-10 |
| Number of pages | 5 |
| Journal | IEE Conference Publication |
| Issue number | 308 |
| Publication status | Published - 1989 Dec 1 |
| Event | European Conference on Circuit Theory and Design - Brighton, Engl Duration: 1989 Sept 5 → 1989 Sept 8 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering