RIAA decoding AudioUnit
RIAA decoding AudioUnit
- Subject: RIAA decoding AudioUnit
- From: Brian Willoughby <email@hidden>
- Date: Sat, 28 Jun 2008 05:14:13 -0700
Hi folks,
The RIAA standard EQ for vinyl came up as a topic on another mailing
list, and I decided to implement the specification in an AudioUnit.
The standard 2-pole 1-zero filter is there, plus an optional
correction for the 50 kHz low pass cutting lathe EQ. The IEC rumble
filter is not working yet, so look for that some time after this 1.0
release. As per the spec, there is unity gain at 1 kHz, with boost
at lower frequencies and cut at higher frequencies. This may clip
subsequent stages, so you may turn off the "Unity gain @ 1 kHz"
parameter to avoid clipping.
As is usual with my AUs, this one is free to end users, but take care
to note the distribution restrictions.
http://www.sounds.wa.com/audiounits.html
Brian Willoughby
Sound Consulting
P.S. This should be an optimal implementation of the RIAA curve. If
anyone finds any errors, please let me know.
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