Coefficient calculation of bandpessfilter in SIGMA STUDIO

hi everybody..

i have some queries regarding the coefficient calculation of filter in
SIGMA STUDIO software..

in the software they had provided equation to calculate the coefficients
but there is some mistakes please help me to get correct equations

ie:in 2nd order band pass filter design in the calculation of alpha
they didn't provide the closing braces of SINH part
eqation is like this

alpha = sin(w0) * sinh( ln(2)/2 * bandwidth * w0/sin(w0)

w0=2*pi*f0/fs
also the bandwidth provide is bandwidth octaves or bandwidth in hertz
ie bandwithQ

where f0-> center frequency
Q= sqrt(2^N)/((2^N) -1)

N-> bandwidth octaves

with regards
rammya Start a New Thread

Howdy Rammya,

check out this page:
http://www.mathworks.com/products/filterdesign/demos.html?file=/products/demos/shipping/filterdesign/parameqdemo.html

About a third of the way down it shows the same formula with all
parenthesies intact.

Patience, persistence, truth,
Dr. mike

On Wed, 17 Mar 2010, r...@ymail.com wrote:

> hi everybody..
>
> i have some queries regarding the coefficient calculation of filter in
> SIGMA STUDIO software..
>
> in the software they had provided equation to calculate the coefficients
> but there is some mistakes please help me to get correct equations
>
> ie:in 2nd order band pass filter design in the calculation of alpha
> they didn't provide the closing braces of SINH part
> eqation is like this
>
> alpha = sin(w0) * sinh( ln(2)/2 * bandwidth * w0/sin(w0)
>
> w0=2*pi*f0/fs
> also the bandwidth provide is bandwidth octaves or bandwidth in hertz
> ie bandwithQ
>
> where f0-> center frequency
> Q= sqrt(2^N)/((2^N) -1)
>
> N-> bandwidth octaves
>
> with regards
> rammya
> Start a New Thread