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How to implement these biquad filters? 1 year 6 months ago #47569

  • jdubs
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Hey guys, I have the following 96khz RIAA correction biquad filters that I would like to use:

a coefficients 1. -1.866632 .86705829
b coefficients 1. -.85352776 -.11046426

gain at 1kHz 18.625dB

How would I input these into the MiniDSP software?

Thanks!
Jim

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Last edit: by jdubs.

How to implement these biquad filters? 1 year 6 months ago #47589

  • Ultrasonic
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On the outputs tab in the plugin, click on PEQ and then Advanced. This will then let you type in biquad coefficients.

An 18.625 dB gain at 1 kHz sounds like a bad idea though. What makes you want to do this?

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How to implement these biquad filters? 1 year 6 months ago #47590

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Thanks and how is the gain piece of it entered?

Re: that gain....its for RIAA correction....so a big boost is needed.

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How to implement these biquad filters? 1 year 6 months ago #47591

  • Ultrasonic
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Thanks and how is the gain piece of it entered?

Re: that gain....its for RIAA correction....so a big boost is needed.


Ah, I've never had anything to do with vinyl :) .

Correctly calculated biquad coefficients define every aspect of the filter, including the gain. You don't set this separately. Once you've entered the coefficients you'll get a visual representation of the filter so you'll be able to see if it looks as you expect.

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How to implement these biquad filters? 1 year 6 months ago #47593

  • dreite
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This kind of thing is much better done in an analog phono preamp/EQ.

Dave.

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How to implement these biquad filters? 1 year 6 months ago #47594

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This kind of thing is much better done in an analog phono preamp/EQ.

Dave.


Ughh...

-Jim

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Last edit: by jdubs.

How to implement these biquad filters? 1 year 6 months ago #47600

  • Ultrasonic
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Two quick thoughts:

I wouldn't discount a well-designed phono stage with built in correction being superior but I don't use a turntable myself to comment from experience. Do you have a phono stage but this lacks the RIAA correction?

Thinking about this I guess you need to apply multiple biquads rather than the single one you mentioned? If so it would probably be easier to save these in a text file and using this to load them all in one step. Let me know if you want to do this and I'll then check the required format for you.

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Last edit: by Ultrasonic.
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