Difference between revisions of "Default EQCurves"

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(Update Telephone curve)
(Prototype bass/treble cut/boost curves)
Line 57: Line 57:
 
</curve>
 
</curve>
 
</pre>
 
</pre>
* bass boost
 
  Paste here
 
* bass cut
 
  Paste here
 
 
* 100Hz rumble (from Koz http://forum.audacityteam.org/viewtopic.php?f=28&t=33824#p90963).  I like this as it has a reference and I can see the use.  Why shelve at -40-odd dB though?  Why not go all the way down?  I suggest removing the first 4 points and replacing with
 
* 100Hz rumble (from Koz http://forum.audacityteam.org/viewtopic.php?f=28&t=33824#p90963).  I like this as it has a reference and I can see the use.  Why shelve at -40-odd dB though?  Why not go all the way down?  I suggest removing the first 4 points and replacing with
 
<point f="20.0" d="-80.0"/>
 
<point f="20.0" d="-80.0"/>
Line 170: Line 166:
 
<point f="5000.000000000000" d="-9.993000000000"/>
 
<point f="5000.000000000000" d="-9.993000000000"/>
 
<point f="48000.000000000000" d="-88.117000000000"/>
 
<point f="48000.000000000000" d="-88.117000000000"/>
 +
</curve>
 +
</pre>
 +
'''MJS:''' Just give users an idea of what these might look like.  We don't have agreed definitions of 'boost' or 'cut' or 'treble' of 'bass' so give an easily-modified (few points) prototype.
 +
* bass boost
 +
<pre>
 +
    <curve name="Bass Boost">
 +
        <point f="100.000000000000" d="9.000000000000"/>
 +
        <point f="500.000000000000" d="0.000000000000"/>
 +
    </curve>
 +
</pre>
 +
* bass cut
 +
<pre>
 +
<curve name="Bass Cut">
 +
<point f="150.000000000000" d="-50.000000000000"/>
 +
<point f="300.000000000000" d="0.000000000000"/>
 
</curve>
 
</curve>
 
</pre>
 
</pre>
 
* treble boost
 
* treble boost
  Paste here
+
<pre>
 +
<curve name="Treble Boost">
 +
<point f="4000.000000000000" d="0.000000000000"/>
 +
<point f="5000.000000000000" d="9.000000000000"/>
 +
</curve>
 +
</pre>
 
* treble cut
 
* treble cut
  Paste here
+
<pre>
 +
<curve name="Treble Cut">
 +
<point f="6000.000000000000" d="0.000000000000"/>
 +
<point f="10000.000000000000" d="-110.000000000000"/>
 +
</curve>
 +
</pre>
 
* Walkie-talkie
 
* Walkie-talkie
 
An easily-edited starting point for a 'walkie-talkie' sound
 
An easily-edited starting point for a 'walkie-talkie' sound

Revision as of 23:55, 14 October 2010

Here is a starting point for a default list of curves. This forms part of a Proposal for Import and Export of Equalization curves. Note that I have added some attributes to the 'curve'; these are not decided on yet.

You should be able to copy-paste the curves in the box below into EQCurves.xml and have them appear next time you open 'Effect->Equalization...'.

The following curves have been suggested (only the ones marked in green are actually in the current proposed default curve.

Also see Submit your EQ Curves on the Forum for some possible curves for consideration.


  • 60 Hz notch - Gale: We are going to distribute notch.ny with Audacity which can cut a much deeper notch, so we probably don't need this. Additional parameters have been proposed for this (curve length="8192" category="default" draw="yes" log="yes") but filter length can't be set this way yet.
	<curve name="60Hz notch">
		<point f="49.4" d="0"/>
		<point f="60" d="-120"/>
		<point f="71.3" d="0"/>
	</curve>
  • acoustic - Gale: generic acoustic 78 rpm curve. In reality there are hundreds of 78 rpm curves.
  • MJS: Who says 'acoustic' is a 'generic acoustic 78 rpm curve'? I've never seen that before. I always wondered what it was! It looks very crude and not very useful to me.
    • Gale: Good job you queried it. I'm sure from comments I've seen before that it was "intended" as some kind of "very early" curve, but on reflection the huge cut in the lowest frequencies makes little sense. In any case from now casting around in articles on the web e.g. http://www.shellac.org/wams/wequal.html it's clear that acoustic 78 rpms were not recorded with any EQ; the idea only started in the electrical era. So I also think this curve isn't useful.
	<curve name="acoustic">
		<point f="50" d="-20"/>
		<point f="63" d="5"/>
		<point f="70" d="4.400000095367"/>
		<point f="100" d="3.299999952316"/>
		<point f="125" d="2.5"/>
		<point f="200" d="1.700000047684"/>
		<point f="250" d="0"/>
		<point f="2000" d="0"/>
		<point f="3000" d="-1.5"/>
		<point f="4000" d="-2.5"/>
		<point f="5000" d="-3.299999952316"/>
		<point f="6000" d="-4"/>
		<point f="7000" d="-4.5"/>
		<point f="8000" d="-5"/>
		<point f="9000" d="-10"/>
		<point f="10000" d="-15"/>
		<point f="15000" d="-20"/>
	</curve>
  • amradio

MJS Replacement AM Radio curve. Cutoffs at 50Hz and 4.5kHz, 8th-order rolloff. Limited number of points to make editing easier should a user not like it.

	<curve name="AM Radio">
		<point f="20.000" d="-63.670"/>
		<point f="31.000" d="-33.219"/>
		<point f="50.000" d="-3.010"/>
		<point f="63.000" d="-0.106"/>
		<point f="100.000" d="0.000"/>
		<point f="2500.000" d="0.000"/>
		<point f="4000.000" d="-0.614"/>
		<point f="5000" d="-8.059"/>
		<point f="8000" d="-39.981"/>
		<point f="20000.000" d="-103.651"/>
		<point f="48000.000" d="-164.485"/>
	</curve>

<point f="20.0" d="-80.0"/>

    <curve name="100Hz_Rumble">
        <point f="25.558066373145" d="-40.000000000000"/>
        <point f="31.632604280524" d="-39.353843688965"/>
        <point f="37.316881063924" d="-37.953842163086"/>
        <point f="42.635296659786" d="-36.230766296387"/>
        <point f="49.237316986327" d="-33.107692718506"/>
        <point f="54.196034330446" d="-29.553844451904"/>
        <point f="88.033573501041" d="-6.923076629639"/>
        <point f="95.871851182279" d="-4.523078918457"/>
        <point f="108.957037410504" d="-1.938461303711"/>
        <point f="123.828171198057" d="-0.738462448120"/>
        <point f="149.228077614658" d="-0.092308044434"/>
    </curve>
  • Inverse RIAA Gale: This is a convenience included in 1.3.12 release, but not mandatory as you can use the button to invert the RIAA curve.
  • MJS: This is outdated by the improved RIAA curve below. I suggest that it is not included in the default EQCurves for the reason given just above.
    • Gale: Agreed it's marginal, though no doubt some would like it/may not figure you can invert the RIAA curve. I don't mind updating it against the new RIAA curve if others think we want it. If not, it can go.
	<curve name="Inverse RIAA">
		<point f="30.000000000000" d="-18.600000381470"/>
		<point f="31.000000000000" d="-18.500000000000"/>
		<point f="50.000000000000" d="-16.899999618530"/>
		<point f="63.000000000000" d="-15.899999618530"/>
		<point f="70.000000000000" d="-15.300000190735"/>
		<point f="100.000000000000" d="-13.100000381470"/>
		<point f="125.000000000000" d="-11.600000381470"/>
		<point f="200.000000000000" d="-8.199999809265"/>
		<point f="250.000000000000" d="-6.699999809265"/>
		<point f="300.000000000000" d="-5.500000000000"/>
		<point f="400.000000000000" d="-3.799999952316"/>
		<point f="500.000000000000" d="-2.599999904633"/>
		<point f="600.000000000000" d="-1.799999952316"/>
		<point f="700.000000000000" d="-1.200000047684"/>
		<point f="800.000000000000" d="-0.800000011921"/>
		<point f="900.000000000000" d="-0.300000011921"/>
		<point f="1000.000000000000" d="0.000000000000"/>
		<point f="2000.000000000000" d="2.599999904633"/>
		<point f="3000.000000000000" d="4.699999809265"/>
		<point f="4000.000000000000" d="6.599999904633"/>
		<point f="5000.000000000000" d="8.199999809265"/>
		<point f="6000.000000000000" d="9.600000381470"/>
		<point f="7000.000000000000" d="10.800000190735"/>
		<point f="8000.000000000000" d="11.899999618530"/>
		<point f="9000.000000000000" d="12.899999618530"/>
		<point f="10000.000000000000" d="13.699999809265"/>
		<point f="15000.000000000000" d="17.200000762939"/>
		<point f="16000.000000000000" d="17.700000762939"/>
	</curve>
  • loudness
  Paste here
  • RIAA Gale: This one is essential. MJS: Agreed, but lets get it right. This is at 1/3rd octave intervals.
	<curve name="RIAA">
		<point f="20.000" d="19.274"/>
		<point f="25.000" d="18.954"/>
		<point f="31.000" d="18.516"/>
		<point f="40.000" d="17.792"/>
		<point f="50.000" d="16.946"/>
		<point f="63.000" d="15.852"/>
		<point f="80.000" d="14.506"/>
		<point f="100.000" d="13.088"/>
		<point f="125.000" d="11.563"/>
		<point f="160.000" d="9.809"/>
		<point f="200.000" d="8.219"/>
		<point f="250.000" d="6.677"/>
		<point f="315.000" d="5.179"/>
		<point f="400.000" d="3.784"/>
		<point f="500.000" d="2.648"/>
		<point f="630.000" d="1.642"/>
		<point f="800.000" d="0.751"/>
		<point f="1000.000" d="0.000"/>
		<point f="1250.000" d="-0.744"/>
		<point f="1600.000" d="-1.643"/>
		<point f="2000.000" d="-2.589"/>
		<point f="2500.000" d="-3.700"/>
		<point f="3150.000" d="-5.038"/>
		<point f="4000.000" d="-6.605"/>
		<point f="5000.000" d="-8.210"/>
		<point f="6300.000" d="-9.980"/>
		<point f="8000.000" d="-11.894"/>
		<point f="10000.000" d="-13.734"/>
		<point f="12500.000" d="-15.609"/>
		<point f="16000.000" d="-17.708"/>
		<point f="20000.000" d="-19.620"/>
		<point f="25000.000" d="-21.542"/>
		<point f="48000.000" d="-27.187"/>
	</curve>

  • rumble filter
  Paste here
  • telephone - 300Hz-3.8kHz, 4th Order roll-offs. Done from a spreadsheet.
	<curve name="Telephone">
		<point f="20.000000000000" d="-94.087000000000"/>
		<point f="200.000000000000" d="-14.254000000000"/>
		<point f="250.000000000000" d="-7.243000000000"/>
		<point f="315.000000000000" d="-2.245000000000"/>
		<point f="400.000000000000" d="-0.414000000000"/>
		<point f="500.000000000000" d="0.000000000000"/>
		<point f="2500.000000000000" d="0.000000000000"/>
		<point f="3150.000000000000" d="-0.874000000000"/>
		<point f="4000.000000000000" d="-3.992000000000"/>
		<point f="5000.000000000000" d="-9.993000000000"/>
		<point f="48000.000000000000" d="-88.117000000000"/>
	</curve>

MJS: Just give users an idea of what these might look like. We don't have agreed definitions of 'boost' or 'cut' or 'treble' of 'bass' so give an easily-modified (few points) prototype.

  • bass boost
    <curve name="Bass Boost">
        <point f="100.000000000000" d="9.000000000000"/>
        <point f="500.000000000000" d="0.000000000000"/>
    </curve>
  • bass cut
	<curve name="Bass Cut">
		<point f="150.000000000000" d="-50.000000000000"/>
		<point f="300.000000000000" d="0.000000000000"/>
	</curve>
  • treble boost
	<curve name="Treble Boost">
		<point f="4000.000000000000" d="0.000000000000"/>
		<point f="5000.000000000000" d="9.000000000000"/>
	</curve>
  • treble cut
	<curve name="Treble Cut">
		<point f="6000.000000000000" d="0.000000000000"/>
		<point f="10000.000000000000" d="-110.000000000000"/>
	</curve>
  • Walkie-talkie

An easily-edited starting point for a 'walkie-talkie' sound

	<curve name="Walkie-talkie">
		<point f="100.000000000000" d="-120.000000000000"/>
		<point f="101.000000000000" d="0.000000000000"/>
		<point f="2000.000000000000" d="0.000000000000"/>
		<point f="2001.000000000000" d="-120.000000000000"/>
	</curve>
  • others that should be in the default list
  Paste here