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Is it possible to do this? 5 years 10 months ago #21270

  • lito
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hi,
is it possible to use biquad filters to say increase or drecrease the output by say 3 db using biquad without using the digital output gain. How do you do this? Thanks

Lito

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Is it possible to do this? 5 years 10 months ago #21271

  • john.reekie
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I believe if you set b0 to 1.414 or 0.707 (others at zero), that will do it.

Not sure why though - ?
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?

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Is it possible to do this? 5 years 9 months ago #21302

  • devteam
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@ Lito,

Yes, you indeed can do it:

If you want to combine Gain (GdB) to one of your biquad filter, there is a simple way. Simply "Multiply" your numerators (all b0, b1, b2) to the linear gain value. (Glin)

e.g. H(z) = Glin * (b0 + b1z-1 + b2z-2) / ( 1+a1z-1 + a2z-2)
So Glin = 10^(GdB/20)

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