[linux-audio-dev] applying RIAA curves in software

[fons adriaensen]

On Tue, Oct 25, 2005 at 06:47:51PM -0500, Richard Smith wrote:

> Which one is 9  the 50 or the 2120?
> Any suggestions on what program I can use to run these?  Audacity will
> do LADSPA plugings but I rather something I can script.

Filter 1:   F =   50 Hz, A = 9
Filter 2:   F = 2120 Hz, A = 1

and add the two outputs.

The first one produces the first downward 'corner' at 50 Hz, and
the second one the downward corner at 2120 Hz. The combination of
the two gives the 'upward' corner at 50 * (1 + 9) / 1 = 500 Hz.

-- 
FA