Skip to content Skip to navigation


You are here: Home » Content » FIR Filter on TI Chip


Recently Viewed

This feature requires Javascript to be enabled.

FIR Filter on TI Chip

Module by: Chris Metzler, Abhijit Navlekar. E-mail the authors

Summary: ELEC 301 Project Procedure Part 5: FIR Filtering

5. FIR Filter on the TI Chip.

To create a FIR filter which matches a desired inverse filter, use the built in MATLAB filter design program called fir2 [b = fir2(n,f,m)]. This designs an n order FIR filter which attempts to create an FIR filter whose spectrum matches a linear interpolation between input amplitudes m at frequencies f. The coefficients (b) are obtained by applying an inverse Fourier transform to m at frequencies f and multiplying by a window. In creating an inverse filter, the default Hamming window is acceptable because it provides a balance between the dynamic range and the resolution of the signal. The response of the inverse filter at different frequencies should not be so different that a huge dynamic range is required. Finally enter these coefficients into the TI chip and produce an FIR filter.

Figure 1
Figure 1 (graphics1.png)

h=fir2(62, ((10.^(linspace(0,1,length(targetfft))'))-1)/9,targetfft);

Figure 2
Figure 2 (graphics2.jpg)
The FIR2 command with 64 coefficients does an acceptable job of matching the shape of an ideal inverse filter. However, given more memory and more coefficients one could do any even better job of matching the ideal.

Content actions

Download module as:

PDF | EPUB (?)

What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

Downloading to a reading device

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

| More downloads ...

Add module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens


A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks