Is there a way to simulate a notch filter in CVI?

[JasmineD]

Hi

I am pretty new to CVI.  I've only used it for a course in university. 

I'm wondering if CVI can do things that Matlab can do.  For example, a notch filter is very easily implemented in Matlab. 

Is there a way to create a notch filter in CVI?

Thanks,

Jasmine

[Tanya_V]

Hi Jasmine,

In the CVI Library you should find a Advanced Analysis Library. From there go to Signal Processing»FIR Digital Filters and look for any function that ends in _BSF (Band Stop Filter). These functions will give you the coefficients for a filter and then you would convolve it with your signal to filter the signal. Here's some example code that comes with the  Wind_BSF filter:

/* Design a 55-point bandstop FIR linear phase filter that can achieve at least a 44 dB attenuation and filter the incoming signal with the designed filter. */
double x[256], coef[55], y[310], fs, fl, fh;
n, m, windType;
fs = 1000.0; /* sampling frequency */
fl = 200.0; /* desired lower cutoff frequency */
fh = 300.0; /* desired higher cutoff frequency */
/* stop band is from 200.0 to 300.0 */
n = 55; /* filter length */
windType = 3; /* using Hanning window */
m = 256;
Wind_BSF (fs, fl, fh, n, coef, windType);
Convolve (coef, n, x, m, y); /* Convolve the filter with the signal. */

 I hope this helps!