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Perception and Measurement of Headphone Sound Quality
Speedskater
post Apr 24 2013, 20:19
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Sean Olive has a new blog page.

"The Relationship between Perception and Measurement of Headphone Sound Quality"

http://seanolive.blogspot.com/2013/04/the-...eption-and.html


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xnor
post Apr 26 2013, 02:29
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For all intents and purposes single driver headphones are (mostly) minimum phase, so flattening the frequency response using a linear phase EQ with pre-ringing just doesn't make sense.
And I guess we all know that minimum phase filters are "perfectly reversible". So for equalization during playback linear phase is crap imho.

On audibility of phase:
http://www.audioholics.com/education/acous...dibility-part-2

edit:
QUOTE (extrabigmehdi @ Apr 26 2013, 00:37) *
Having played with different kind of eq (minmum phase & linear phase) , I'm skeptical when you say that the phase shift are undetectable.

What does a linear phase EQ have to do with hearing phase shifts? When you compare min. with linear phase EQs you are not just comparing phase shift but also the audibility of pre-ringing.

QUOTE (extrabigmehdi @ Apr 26 2013, 01:39) *
There's the eq ddmf lp10, that allow to set the "amount" of phase separately for each frequency band. (i.e 0 for minimum phase, 1 for linear phase, and any values between). Would you consider using such eq for comparison "fair" ?

Just use a min. phase EQ that has an all pass filter.

This post has been edited by xnor: Apr 26 2013, 02:34
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extrabigmehdi
post Apr 26 2013, 12:30
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QUOTE (xnor @ Apr 26 2013, 01:29) *
For all intents and purposes single driver headphones are (mostly) minimum phase, so flattening the frequency response using a linear phase EQ with pre-ringing just doesn't make sense.
And I guess we all know that minimum phase filters are "perfectly reversible". So for equalization during playback linear phase is crap imho.


Well, does a minimum phase eq allows to cancel the phase from the headphones ? If not, they may just add more phase, and using "linear phase" still makes sense.
And regarding the "pre-ringing", it can be minimized by using enough smooth eq curve which means , you don't try to "flatten" exactly the freq response.

But I don't try to "flatten" the freq curve anyways. According to headroom website:

QUOTE
A "natural sounding" headphone should be slightly higher in the bass (about 3 or 4 dB) between 40Hz and 500Hz. This compensates for the fact that headphones don't give you the physical punch or 'impact' that the sound waves from a room speaker have; so a slight compensation for increased bass response is needed for natural sound.

Headphones also need to be rolled-off in the highs to compensate for the drivers being so close to the ear; a gently sloping flat line from 1kHz to about 8-10dB down at 20kHz is about right. You'll notice all headphone measurements have a lot of jagged ups & downs (peaks & valleys) in the high frequencies; this is normal and mostly due to reflection cancellations in the folds and ridges in the outer part of the ear. Ideally however, the ups and downs of the frequency response should be fairly small and average out to a flat line. Large peaks or valleys over 3kHz in width usually indicate poor headphone response, and should be viewed as a coloring of the sound. Some small dips in the highs may actually be desirable and should exist in the 2kHz to 8kHz region.


http://www.headphone.com/learning-center/t...easurements.php


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Posts in this topic
- Speedskater   Perception and Measurement of Headphone Sound Quality   Apr 24 2013, 20:19
- - benski   The headphones aren't specifically identified ...   Apr 24 2013, 20:35
|- - chicks   QUOTE (benski @ Apr 24 2013, 12:35) The h...   Apr 24 2013, 22:10
||- - benski   QUOTE (chicks @ Apr 24 2013, 16:10) QUOTE...   Apr 24 2013, 22:19
|- - solive   QUOTE (benski @ Apr 24 2013, 12:35) The h...   Apr 25 2013, 01:31
|- - chicks   QUOTE (solive @ Apr 24 2013, 17:31) You...   Apr 25 2013, 17:17
|- - solive   QUOTE (chicks @ Apr 25 2013, 09:17) QUOTE...   Apr 25 2013, 19:37
- - dhromed   QUOTE marketing B.S. (Before Science) he he he he   Apr 24 2013, 21:57
- - extrabigmehdi   It's obvious that the HP1 is the audeze, becau...   Apr 24 2013, 23:34
|- - solive   QUOTE (extrabigmehdi @ Apr 24 2013, 15:34...   Apr 25 2013, 01:39
- - IgorC   Interesting article. It will be even better with s...   Apr 25 2013, 01:44
- - godrick   I wonder which of the following is correct: hp1 -...   Apr 25 2013, 02:13
- - extrabigmehdi   Here is my guess, based on user comments only. hp...   Apr 25 2013, 02:57
- - dhromed   In practical terms, i.e. when buying some phones f...   Apr 25 2013, 09:16
|- - extrabigmehdi   QUOTE (dhromed @ Apr 25 2013, 08:16) In p...   Apr 25 2013, 12:58
|- - markanini   QUOTE (dhromed @ Apr 25 2013, 10:16) In p...   Apr 25 2013, 18:16
||- - xnor   QUOTE (markanini @ Apr 25 2013, 18:16) Al...   Apr 25 2013, 18:37
||- - markanini   QUOTE (xnor @ Apr 25 2013, 19:37) Your li...   Apr 25 2013, 19:25
|- - Nessuno   QUOTE (extrabigmehdi @ Apr 25 2013, 13:58...   Apr 25 2013, 21:46
|- - extrabigmehdi   QUOTE (Nessuno @ Apr 25 2013, 20:46) All ...   Apr 25 2013, 22:42
|- - Nessuno   QUOTE (extrabigmehdi @ Apr 25 2013, 23:42...   Apr 26 2013, 14:05
|- - markanini   QUOTE (Nessuno @ Apr 26 2013, 15:05) I me...   Apr 26 2013, 20:14
- - zheka   Dr. Olive dropped a few hints about identity of t...   Apr 25 2013, 17:01
|- - solive   QUOTE (zheka @ Apr 25 2013, 09:01) Dr. Ol...   Apr 25 2013, 19:20
- - xnor   I've seen him wearing K550's about a year ...   Apr 25 2013, 18:09
- - DVDdoug   QUOTE In practical terms, i.e. when buying some ph...   Apr 25 2013, 18:17
|- - solive   QUOTE (DVDdoug @ Apr 25 2013, 10:17) QUOT...   Apr 25 2013, 19:39
|- - extrabigmehdi   QUOTE (DVDdoug @ Apr 25 2013, 17:17) Head...   Apr 25 2013, 20:54
||- - pdq   QUOTE (extrabigmehdi @ Apr 25 2013, 15:54...   Apr 25 2013, 21:04
|- - Arnold B. Krueger   QUOTE (DVDdoug @ Apr 25 2013, 13:17) QUOT...   Apr 26 2013, 13:19
|- - Martel   QUOTE (DVDdoug @ Apr 25 2013, 19:17) Yes,...   Sep 12 2013, 08:24
|- - Nessuno   QUOTE (Martel @ Sep 12 2013, 09:24) QUOTE...   Sep 12 2013, 09:55
|- - markanini   QUOTE (Martel @ Sep 12 2013, 09:24) QUOTE...   Sep 12 2013, 10:01
- - DVDdoug   QUOTE The website innerfidelity provide different ...   Apr 25 2013, 21:47
- - greynol   If your pinna doesn't affect the sound when we...   Apr 25 2013, 23:04
- - xnor   From my experience phase is really a non-issue in ...   Apr 25 2013, 23:13
- - extrabigmehdi   QUOTE (greynol @ Apr 25 2013, 22:04) If y...   Apr 26 2013, 00:37
- - DVDdoug   QUOTE Having played with different kind of eq (min...   Apr 26 2013, 01:02
|- - extrabigmehdi   QUOTE (DVDdoug @ Apr 26 2013, 00:02) To r...   Apr 26 2013, 01:39
- - xnor   For all intents and purposes single driver headpho...   Apr 26 2013, 02:29
|- - extrabigmehdi   QUOTE (xnor @ Apr 26 2013, 01:29) For all...   Apr 26 2013, 12:30
|- - xnor   QUOTE (extrabigmehdi @ Apr 26 2013, 12:30...   Apr 26 2013, 13:46
|- - extrabigmehdi   QUOTE (xnor @ Apr 26 2013, 12:46) so yes,...   Apr 26 2013, 15:58
||- - xnor   QUOTE (extrabigmehdi @ Apr 26 2013, 15:58...   Apr 26 2013, 19:03
|- - Arnold B. Krueger   QUOTE (xnor @ Apr 26 2013, 08:46) But sur...   Apr 26 2013, 16:26
- - markanini   extrabigmehdi, youre not getting it. Just stop.   Apr 26 2013, 13:30
- - xnor   Imaging with stereo recordings in headphones is a ...   Sep 12 2013, 10:54


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