help formula for biquad coefficients make

[sakthivel159]

Dear Friends

i am beginning DSP, so i need help detail about following biquad coefficients make formula, please help me ,

H(z) = (b0+ b1z[-1]+ b2z[-2]) / (1 - a1 z[-1] - a2[-2]).

fs = 44.1KHz,
fo =80Hz,
Peak gain =6db,
Q= 0.7071,

 

[TNT]

You tried these?

Coefficient Calculator For Digital Biquad Filters - COEFFICIENT-CALC - TI Software Folder

or

Biquad calculator v2 | EarLevel Engineering

fs = 44.1KHz,
fo =80Hz,
Peak gain =6db,
Q= 0.7071,

=>

a0 = 1.007957238938289
a1 = -1.9838808895496516
a2 = 0.9760525264901593
b1 = -1.9838808895496516
b2 = 0.9840097654284482

//

 

[scott wurcer]

The minidsp site has a free Excell spread sheet for all the standard biquads. You need to specify low or high pass.

 

[sakthivel159]

Hi TNT ,

Thanks your reply , i tried both above types , but b2 value is different otherwise all biquad value is correct ,