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

[Richard Smith]

>
> > The RIAA record curve reduces bass and increases treble, and the reverse
> > RIAA curve for playback does the opposite.
>
> Sorry, but this is plain wrong. The RIAA filter used when cutting a disk
> master will boost bass (below 50 Hz), and reduce high frequencies. This
> actually leads to a worse S/N ratio on playback. It looks like this:

I'm confused then.

This page:

http://www.bonavolta.ch/hobby/en/audio/riaa.htm

Has a spread sheet that runs the math on the equation presented. 
Unless I'm just backwards for RIAA reproduction it yeilds roughly 20dB
of gain for 20Hz and -21dB for 21kHz.  Which seems backward from what
you are saying.

--
Richard A. Smith