First of all i will try to put my agenda of my system:
>capture of ubiquitous speech of a area under surveillance and further transfer it to a RF module that's it
In that event i have chosen to use a stereo codec chip from TI - AIC3204 which has inbuilt programmable IIR Bi-quad Filter having a transfer function as shown below
i have five such Biquad Blocks through which using 2 i can make out a Band Pass Filter (200-3800) while speech being captured at a sampling rate of 8000 samples / sec,More over the coefficient is a 2s complemented 24 bit value
now my problem is how to find out the above coefficients of the bi-quad blocks (i dont want to use any ready made calculators as one such called TIBQ calculator as i want a subjective approach towards my task)
neither i have found a solution from matlab or any simulators
what do you say do any of have got a approach to find out Bi quad Filter Coefficients
You usually start with the transfer function of the time-continuous filter prototype (e.g. Butterworth, Chebychev) and convert it to z-domain by bilinear or similar transformation.
I'm sure that you can do that in Matlab.
As a lazy engineer, I prefer tools that directly give the z-domain transfer function for a given filter specification.
if you are that sure show me the way, i too can go with the way you mentioned but finally my filter to work i have to fill my filter coefficients with the needed