Welcome, Guest
Username: Password: Remember me
All tutorials related to equalization of a system with miniDSP platforms.
  • Page:
  • 1

TOPIC:

Is it possible to do this? 7 years 8 months ago #21270

  • lito
  • lito's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 4
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Is it possible to do this? 7 years 8 months ago #21271

  • john.reekie
  • john.reekie's Avatar
  • Offline
  • Platinum Member
  • Platinum Member
  • Posts: 3778
  • Thank you received: 1593
I believe if you set b0 to 1.414 or 0.707 (others at zero), that will do it.

Not sure why though - ?

Please Log in or Create an account to join the conversation.

Is it possible to do this? 7 years 7 months ago #21302

  • devteam
  • devteam's Avatar
  • Away
  • Administrator
  • Administrator
  • Posts: 9161
  • Thank you received: 1460
@ 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)

DevTeam
miniDSP, building a DSP community one board at a time.

For any official support, please contact our technical support team directly @ support.minidsp.com/support/home

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
Moderators: devteam