O'Reilly logo

Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation by C. Britton Rorabaugh

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Note 35. Designing FIR Filters: Basic Window Method

The window method of FIR design is based on the fact that the frequency response of a digital filter is periodic, and therefore can be represented as a Fourier series. A template for the desired frequency response is selected and expanded as a Fourier series. This expansion is then truncated to finite-number terms by multiplying the sequence of Fourier series coefficients with a sequence of samples obtained from a time-limited window function. The resulting finite sequence of terms is then used as the coefficients for an FIR filter. This filter has a frequency response that approximates the original desired response. When a rectangular window is used to truncate the coefficient sequence, the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required