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Topic: RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o (Read 13238 times) previous topic - next topic

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  • Juha
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RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Audacity 1.2.6

Normalization and Amplification done using Audacity features.

24-bit/48kHz (wma) samples:

1 - no RIAA - [ Specified attachment is not available ]
2 - Audacity EQ w/ RIAA preset - [ Specified attachment is not available ]
3 - Audacity EQ w/ RIAA preset + Normalization (< -3.0 dB) - [ Specified attachment is not available ]
4 - Audacity EQ w/ RIAA preset + Amplifying (< -0.0 dB) - [ Specified attachment is not available ]
5 - IIR filter (< -1.0 dB) - [ Specified attachment is not available ]
6 - IIR filter (< -3.0 dB) - [ Specified attachment is not available ]

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


Juha

RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #1
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 am an independent software developer (VinylStudio) based in UK

  • Juha
  • [*][*][*][*][*]
RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #2
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

RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #3
OK, thank you.
I am an independent software developer (VinylStudio) based in UK

  • Juha
  • [*][*][*][*][*]
RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #4
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)):

[ Specified attachment is not available ]

[ Specified attachment is not available ]

[ Specified attachment is not available ]

[ Specified attachment is not available ]


  • Juha
  • [*][*][*][*][*]
RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #5
Here's the final comparison:

[ Specified attachment is not available ]

[ Specified attachment is not available ]

[ Specified attachment is not available ]

[ Specified attachment is not available ]

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


  • Juha
  • [*][*][*][*][*]
RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #6
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)):  (Attachment Link)   (Attachment Link)   (Attachment Link)   (Attachment Link)


Additionally one file for comparisons, which is done using convolution w/ RIAA impulse response data (source file is the same as for the others).

[ Specified attachment is not available ]





  • Juha
  • [*][*][*][*][*]
RIAA EQ comparation between Audacity EQ (FIR) w/ RIAA preset and 2nd o
Reply #7
Forgot to link the IR file(s) used in that sample file #05-05