Talk:SuperEQ - Revision history

Raffriff42: Category:Talk

2015-12-14T00:55:37Z

Category:Talk

Admin at 21:12, 20 September 2015

2015-09-20T21:12:06Z

Admin at 21:09, 20 September 2015

2015-09-20T21:09:30Z

Raffriff42: reply pt.2

2015-09-19T11:30:13Z

reply pt.2

Raffriff42: reply

2015-09-19T01:03:17Z

Admin at 23:14, 18 September 2015

2015-09-18T23:14:51Z

Admin at 23:14, 18 September 2015

2015-09-18T23:14:04Z

Admin at 23:13, 18 September 2015

2015-09-18T23:13:25Z

Admin: added a bunch of questions

2015-09-18T23:12:39Z

added a bunch of questions

Admin: added a bunch of questions

2015-09-18T23:12:09Z

added a bunch of questions

← Older revision		Revision as of 00:55, 14 December 2015
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		+	[[Category:Talk]]
	===== Re: behavior for invalid preset files - the following is ''probably'' true: =====		===== Re: behavior for invalid preset files - the following is ''probably'' true: =====
	<blockquote>''If SuperEQ encounters an error in the preset file, all bands after the invalid line will be set to the last valid decibel value; ''<br>		<blockquote>''If SuperEQ encounters an error in the preset file, all bands after the invalid line will be set to the last valid decibel value; ''<br>

← Older revision		Revision as of 21:12, 20 September 2015
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	::'''EDIT''' Oh, you're asking me to answer these ''in the article''...will do, but I'll have to get citations and stuff.<br>[[User:Raffriff42\|Raffriff42]] 13:30, 19 September 2015 (CEST)		::'''EDIT''' Oh, you're asking me to answer these ''in the article''...will do, but I'll have to get citations and stuff.<br>[[User:Raffriff42\|Raffriff42]] 13:30, 19 September 2015 (CEST)

−	:::Would be nice if you can expand it a little bit (only when relevant of course). Could you enlarge the pics by 250% (so they are cleary visible to the reader)? (Ok, -44dB is the noiselevel i guess.) How do people choose the equalizer bands? Are different choices made or are the bands usually the same? Wrt the question. I noticed that the lowest frequency of every band is a the frequency of a c note. Octaves range from Cj to C(j+1), as least according to https://en.wikipedia.org/wiki/Octave . I don't know anything about this stuff, just saying what i read. ;) [[User:Admin\|Admin]] 23:09, 20 September 2015 (CEST)	+	:::Would be nice if you can expand it a little bit (only when relevant of course). Could you enlarge the pics by 250% (so they are cleary visible to the reader)? (Ok, -44dB is the noiselevel i guess.) How do people choose the equalizer bands? Are different choices made or are the bands usually the same? Wrt the question. I noticed that the lowest frequency of every band is a the frequency of a C-note. Octaves range from Cj to C(j+1), as least according to https://en.wikipedia.org/wiki/Octave and https://en.wikipedia.org/wiki/Pitch_class . I don't know anything about this stuff, just saying what i read. ;) [[User:Admin\|Admin]] 23:09, 20 September 2015 (CEST)

← Older revision		Revision as of 21:09, 20 September 2015
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	::'''EDIT''' Oh, you're asking me to answer these ''in the article''...will do, but I'll have to get citations and stuff.<br>[[User:Raffriff42\|Raffriff42]] 13:30, 19 September 2015 (CEST)		::'''EDIT''' Oh, you're asking me to answer these ''in the article''...will do, but I'll have to get citations and stuff.<br>[[User:Raffriff42\|Raffriff42]] 13:30, 19 September 2015 (CEST)
		+
		+	:::Would be nice if you can expand it a little bit (only when relevant of course). Could you enlarge the pics by 250% (so they are cleary visible to the reader)? (Ok, -44dB is the noiselevel i guess.) How do people choose the equalizer bands? Are different choices made or are the bands usually the same? Wrt the question. I noticed that the lowest frequency of every band is a the frequency of a c note. Octaves range from Cj to C(j+1), as least according to https://en.wikipedia.org/wiki/Octave . I don't know anything about this stuff, just saying what i read. ;) [[User:Admin\|Admin]] 23:09, 20 September 2015 (CEST)

← Older revision		Revision as of 11:30, 19 September 2015
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	::''The lowest bands C-1, C0 and C1 are missing (same for F#). Why?'' I am confused by the question. One, I have never heard equalizer bands referred to by musical notes, and Two, the lowest band's effect extends to zero(!)<br>		::''The lowest bands C-1, C0 and C1 are missing (same for F#). Why?'' I am confused by the question. One, I have never heard equalizer bands referred to by musical notes, and Two, the lowest band's effect extends to zero(!)<br>
	::[[User:Raffriff42\|Raffriff42]] 03:03, 19 September 2015 (CEST)		::[[User:Raffriff42\|Raffriff42]] 03:03, 19 September 2015 (CEST)
		+
		+	::'''EDIT''' Oh, you're asking me to answer these ''in the article''...will do, but I'll have to get citations and stuff.<br>[[User:Raffriff42\|Raffriff42]] 13:30, 19 September 2015 (CEST)

← Older revision		Revision as of 01:03, 19 September 2015
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	:4) The lowest bands C-1, C0 and C1 are missing (same for F#). Why?		:4) The lowest bands C-1, C0 and C1 are missing (same for F#). Why?
	[[User:Admin\|Admin]] 01:12, 19 September 2015 (CEST)		[[User:Admin\|Admin]] 01:12, 19 September 2015 (CEST)
		+
		+	::''Definition of equalization'' - it originally meant to flatten the frequency response (going way way back to analog telephone lines, if not before) but now "equalizing" can also mean any audio effect that tweaks the frequency response, such as making a musical instrument sound "sizzling," "thumping" or "honking."<br>
		+
		+	::''Does it make sense?'' From an old-time audio engineering POV, no. They would want 1/3 octave equalizers, since that's what they're used to. [https://dl.dropboxusercontent.com/u/108089426/Screenshots/geq_31v.jpg Here's a professional 1/3 octave equalizer]; note the center frequencies are industry standard.
		+
		+	::Audio engineers also don't want such sharp separation in the frequency bands. They ''want'' some interaction between the bands, which gives them more control. There's a standard [https://en.wikipedia.org/wiki/Q_factor Q factor] for 1/3 octave graphic equalizers, which I don't recall.
		+
		+	::Very sharp analog filter cutoffs are prone to phase anomalies, but SuperEQ seems OK here, probably because of the extremely high (16383) FIR filter order. Having little experience with an equalizer made this way, I made some tests (like subtracting EQ'd and not-EQ'd sweep tone) and did not find anything that would make me avoid this filter. It seemed fine, actually. It's just different! <br>
		+
		+	::''Why does a value of 0dB in a band correspond with -44dB in the spectrum analysis?'' Spectrum analysis is not perfect - there a tradeoff between frequency and time resolution. Some low-level noise/artifacts are to be expected.<br>
		+
		+	::''The lowest bands C-1, C0 and C1 are missing (same for F#). Why?'' I am confused by the question. One, I have never heard equalizer bands referred to by musical notes, and Two, the lowest band's effect extends to zero(!)<br>
		+	::[[User:Raffriff42\|Raffriff42]] 03:03, 19 September 2015 (CEST)

@@ Line 13: / Line 13: @@
 ::Since equalizers, "adjust the amplitude of audio signals at particular frequencies," they are, "in other words, frequency-specific volume knobs (source: https://en.wikipedia.org/wiki/Equalization_%28audio%29). Seems to apply here too (well at frequency bands instead of particular frequencies).
 :2) Why are the bands (1-18) chosen the way they are. Guess we need to ask Sh0dan. I see that indeed the lower frequencies of the bands are C notes, and the higher frequencies F# notes (see https://en.wikipedia.org/wiki/C_%28musical_note%29 and https://en.wikipedia.org/wiki/F%E2%99%AF_%28musical_note%29). So they are spaced half an octave (sqrt(2)) apart. Why? Does this make sense?
-:3) About your pictures (white noise examples): Why does a values of 0dB in a band correspond with -44dB?
+:3) About your pictures (the white noise examples): Why does a value of 0dB in a band correspond with -44dB in the spectrum analysis?
 :4) The lowest bands C-1, C0 and C1 are missing (same for F#). Why?
 [[User:Admin|Admin]] 01:12, 19 September 2015 (CEST)

@@ Line 4: / Line 4: @@
 </blockquote>
 but I have not tested it very much.<br>
-[[User:Raffriff42|Raffriff42]] 17:56, 16 September 2015 (CEST)
+[[User:Raffriff42|Raffriff42]] 17:56, 16 September 2015 (CEST) <br> <br>
 I guess i need to run it through a debugger to verify the above. I can't make sense of the code itself.
 I see code like 'my_eq.bands[n] = ((-readval)+20);'. Indicating that the first band in Loudness.feq (4dB is changed to 16dB).

← Older revision		Revision as of 23:12, 18 September 2015
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	but I have not tested it very much.<br>		but I have not tested it very much.<br>
	[[User:Raffriff42\|Raffriff42]] 17:56, 16 September 2015 (CEST)		[[User:Raffriff42\|Raffriff42]] 17:56, 16 September 2015 (CEST)
		+	I guess i need to run it through a debugger to verify the above. I can't make sense of the code itself.
		+	I see code like 'my_eq.bands[n] = ((-readval)+20);'. Indicating that the first band in Loudness.feq (4dB is changed to 16dB).
		+	It's probably my misunderstanding.<br>
		+	Anyway a couple of things are still missing:
		+	:1) definition of equalization. I guess here it means:
		+	::Since equalizers, "adjust the amplitude of audio signals at particular frequencies," they are, "in other words, frequency-specific volume knobs (source: https://en.wikipedia.org/wiki/Equalization_%28audio%29). Seems to apply here too (well at frequency bands instead of particular frequencies).
		+	:2) Why are the bands (1-18) chosen the way the were. Guess we need to ask Sh0dan. I see that indeed the lower frequencies of the bands are C notes, and the higher frequencies F# notes (see https://en.wikipedia.org/wiki/C_%28musical_note%29 and https://en.wikipedia.org/wiki/F%E2%99%AF_%28musical_note%29). So they are spaced half an octave (sqrt(2)) apart. Why? Does this make sense?
		+	:3) In your pictures (white noise examples). Why does a values of 0dB in a band correspond with -44dB?
		+	:4) The lowest bands C-1, C0 and C1 are missing (same for F#). Why?
		+	[[User:Admin\|Admin]] 01:12, 19 September 2015 (CEST)