Audacity 1.2.6
Normalization and Amplification done using Audacity features.
24-bit/48kHz (wma) samples:
1 - no RIAA - [attachment=5340:1.wma]
2 - Audacity EQ w/ RIAA preset - [attachment=5341:2.wma]
3 - Audacity EQ w/ RIAA preset + Normalization (< -3.0 dB) - [attachment=5342:3.wma]
4 - Audacity EQ w/ RIAA preset + Amplifying (< -0.0 dB) - [attachment=5343:4.wma]
5 - IIR filter (< -1.0 dB) - [attachment=5344:5.wma]
6 - IIR filter (< -3.0 dB) - [attachment=5345:6.wma]
Examples/instructions to make IIR type RIAA EQ implementation can be found @ http://jiiteepee.fortunecity.com/riaafilter/index.html (http://jiiteepee.fortunecity.com/riaafilter/index.html)
Juha
Meanwhile, 3 years later, in a galaxy far, far away:
The Audacity samples sound wrong to me - too much treble and not enough bass. I have done some experiments of my own which support this. Maybe this is fixed in Audacity 2.x
How did you calculate your IIR filter parameters please?
Meanwhile, 3 years later, in a galaxy far, far away:
The Audacity samples sound wrong to me - too much treble and not enough bass. I have done some experiments of my own which support this. Maybe this is fixed in Audacity 2.x
How did you calculate your IIR filter parameters please?
I have not been here for long so haven't seen this query.
IIR filter coefficients came from Robert Orban http://www.dsprelated.com/showmessage/73300/3.php (http://www.dsprelated.com/showmessage/73300/3.php) and Scott Wurcer.
My new RIAA pages are here - http://jiiteepee.tripod.com/riaa.html (http://jiiteepee.tripod.com/riaa.html)
Juha
OK, thank you.
Maybe this is fixed in Audacity 2.x
Yes, they have improved the preset in 2.x.
Here are new files for my comparison (All recorded using ESI DuaFire and 24/44.1 (files 1-3 through fixed flat phono input, 4 through line input)):
[attachment=7856:01-01-Fl...410_0041.mp3]
[attachment=7857:02-02-ES...410_0041.mp3]
[attachment=7858:03-03-Fl...410_0041.mp3]
[attachment=7859:04-04-Pr...410_0041.mp3]
Here's the final comparison:
[attachment=7860:01_CD_rip.mp3]
[attachment=7861:03_2nd_o..._IIR_VST.mp3]
[attachment=7862:04_FIR_E...Audacity.mp3]
[attachment=7863:05_TerraTec_iVinyl.mp3]
Steep HP @20Hz was used for all 4 samples.
Maybe this is fixed in Audacity 2.x
Yes, they have improved the preset in 2.x. Here are new files for my comparison (All recorded using ESI DuaFire and 24/44.1 (files 1-3 through fixed flat phono input, 4 through line input)): [attachment=7856:01-01-Fl...410_0041.mp3] [attachment=7857:02-02-ES...410_0041.mp3] [attachment=7858:03-03-Fl...410_0041.mp3] [attachment=7859:04-04-Pr...410_0041.mp3]
Additionally one file for comparisons, which is done using convolution w/ RIAA impulse response data (source file is the same as for the others).
[attachment=8194:05-05-Fl...315_1148.mp3]
Forgot to link the IR file(s) (http://www.diyaudio.com/forums/digital-line-level/268276-what-about-digital-riaa-8.html#post4195482) used in that sample file #05-05