Rockbox Development > Feature Ideas
Even more EQ bands are necessary for many users
AlexP:
I don't think those on head-fi are a particularly large section of the population. I do like that website though, it reads warmer and more open than most other websites, which seem muddy by comparison, especially at the mid page point. :)
That aside, if you feel it helps to have loads of bands then by all means go for it, just don't expect to see more bands appearing in the standard Rockbox builds.
saratoga:
--- Quote from: ZoSo on December 18, 2013, 02:42:00 PM ---I respectfully disagree. I've experienced a lot of success making headphones fairly neutral in the past by removing their deviations from neutrality with parametric equalization, all while without creating audible (to my ears) artifacts. If I am creating artifacts, I can't hear them, so I really don't care. The post-ringing of minimum phase equalizers is generally masked by the signal itself anyways.
--- End quote ---
I don't doubt that this sounds ok to you, most of those adjustments have a minuscule effect on the actual signal as they are very small. How are you generating these parameters though? I'm quite skeptical for instance that you actually heard some of these resonances, as 1 or 2 dB adjustments can be hard to hear in fairly broad bands, let alone with very high Q.
ZoSo:
--- Quote ---How are you generating these parameters though?
--- End quote ---
0-1000 Hz by measuring the headphones with a microphone, past 1000 Hz by using a sine wave generator (Sinegen) to sweep through the frequencies while listening to the generated sine tones. I then mentally do my best to make what I hear match a smoothly ascending and descending diffuse field target curve. Pic related.
One of these days I'm going to build some in-ear microphones as described here: http://www.davidgriesinger.com/Binaural_hearing_and_headphones.ppt then use them to match the headphone response at my eardrum with the response of equalized-to-neutrality speakers at my eardrum. This type of thing is certainly going to require a lot more than 8 peak bands of EQ.
1 decibel differences are very difficult to perceive whilst listening to music... notsomuch whilst listening to test tones, though:
http://www.audiocheck.net/blindtests_level.php?lvl=1
I can reliably detect half-decibel differences using the above test.
--- Quote ---I do like that website though, it reads warmer and more open than most other websites, which seem muddy by comparison, especially at the mid page point.
--- End quote ---
;D
saratoga:
--- Quote from: ZoSo on December 18, 2013, 07:13:47 PM ---
--- Quote ---How are you generating these parameters though?
--- End quote ---
0-1000 Hz by measuring the headphones with a microphone, past 1000 Hz by using a sine wave generator (Sinegen) to sweep through the frequencies while listening to the generated sine tones. I then mentally do my best to make what I hear match a smoothly ascending and descending diffuse field target curve. Pic related.
--- End quote ---
I think equalizing based on pink noise or whatever is a reasonable idea, but I am skeptical the EQ settings you have chosen are all that realistic. I suspect that you could turn a few of them off and not even realize it.
--- Quote from: ZoSo on December 18, 2013, 07:13:47 PM ---1 decibel differences are very difficult to perceive whilst listening to music... notsomuch whilst listening to test tones, though:
--- End quote ---
That is not the same thing. You're talking about a 1 or 2 dB change over a very narrow range of frequencies, not a volume change of the entire signal. For example your 1.5 dB change at 5400 Hz with a Q of 10 affects just 3% of the audible spectrum. To have the same power as a Q=1 filter at 1 dB it would have to be about 10x as large. Or to put it another way its like saying you have a Q=1 filter at 0.1 dB. You might hear it on a pure tone if you listen carefully (and precisely align the tone with the center of the filter) but thats basically irrelevant to actual audio.
ZoSo:
--- Quote ---I suspect that you could turn a few of them off and not even realize it.
--- End quote ---
If I flip back and forth between the original EQ setting and one with the 1-2.5 decibel gain bands removed whilst listening to music, I can definitely hear the difference as I flip back and forth between them, and I can very easily hear those peaks and valleys in the unequalized response whilst sweeping a sine tone through the various frequencies and listening to it. You're just going to have to trust me on this one.
Yeah, they're small differences whilst listening to music, but once I know they're there from listening to the sine tones it's going to drive me nuts to not EQ them out just based on principle and all. I'm detail-oriented and like doing things right.
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