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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)

also the bandwidth provide is bandwidth octaves or bandwidth in hertz
ie bandwith=f0/Q
 
where f0-> center frequency
Q= sqrt(2^N)/((2^N) -1)

N-> bandwidth octaves

with regards 
rammya

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