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RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Juha
post Aug 26 2009, 10:39
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Audacity 1.2.6

Normalization and Amplification done using Audacity features.

24-bit/48kHz (wma) samples:

1 - no RIAA - Attached File  1.wma ( 1.21MB ) Number of downloads: 550

2 - Audacity EQ w/ RIAA preset - Attached File  2.wma ( 1.1MB ) Number of downloads: 389

3 - Audacity EQ w/ RIAA preset + Normalization (< -3.0 dB) - Attached File  3.wma ( 1.16MB ) Number of downloads: 334

4 - Audacity EQ w/ RIAA preset + Amplifying (< -0.0 dB) - Attached File  4.wma ( 1.16MB ) Number of downloads: 317

5 - IIR filter (< -1.0 dB) - Attached File  5.wma ( 1.07MB ) Number of downloads: 298

6 - IIR filter (< -3.0 dB) - Attached File  6.wma ( 1.07MB ) Number of downloads: 425


Examples/instructions to make IIR type RIAA EQ implementation can be found @ http://jiiteepee.fortunecity.com/riaafilter/index.html


Juha
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Paul Sanders
post Dec 28 2012, 16:29
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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?


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I am an independent software developer (VinylStudio) based in UK
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Juha
post Sep 8 2013, 18:34
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QUOTE (Paul Sanders @ Dec 28 2012, 18:29) *
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 and Scott Wurcer.

My new RIAA pages are here - http://jiiteepee.tripod.com/riaa.html


Juha
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Paul Sanders
post Sep 9 2013, 15:35
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OK, thank you.


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Juha
post Apr 9 2014, 22:57
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QUOTE
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)):

Attached File  01-01-Flat_-_ESI-consolidated-140410_0041.mp3 ( 2.29MB ) Number of downloads: 61


Attached File  02-02-ESI_Flat_-_Audacity__EQ_RIAA_preset__4095_taps__-consolidated-140410_0041.mp3 ( 2.29MB ) Number of downloads: 46


Attached File  03-03-Flat_-_ESI__RIAA_VST_-consolidated-140410_0041.mp3 ( 2.29MB ) Number of downloads: 49


Attached File  04-04-Project_phono_box_MM_-_ESI-consolidated-140410_0041.mp3 ( 2.29MB ) Number of downloads: 50


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Juha
post Apr 13 2014, 19:43
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Here's the final comparison:

Attached File  01_CD_rip.mp3 ( 1.15MB ) Number of downloads: 49


Attached File  03_2nd_order_IIR_VST.mp3 ( 1.15MB ) Number of downloads: 43


Attached File  04_FIR_EQ_preset_4096_taps_Audacity.mp3 ( 1.15MB ) Number of downloads: 48


Attached File  05_TerraTec_iVinyl.mp3 ( 1.15MB ) Number of downloads: 45


Steep HP @20Hz was used for all 4 samples.

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