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foo_dsp_xfeed, Crossfeed
xnor
post Sep 12 2011, 18:50
Post #1





Group: Developer
Posts: 486
Joined: 29-April 11
From: Austria
Member No.: 90198



Heya,

this is the discussion thread for foo_dsp_xfeed, a Crossfeed DSP component.
For those who don't know what that is: it enables a more relaxed and natural listening experience with headphones. A more detailed explanation why and how it works is given below.

Download

Usage
1) Install the downloaded zip file using the Components preferences page.
2) Add "Crossfeed" to the list of active DSPs (Playback - DSP Manager preferences page).
3) Configure it.

Explanation
Let's take a look at the image below.



When listening with headphones, the left ear only hears sound coming from the left speaker (LL) and the right ear only the sound coming from the right speaker (RR). This often results in unnatural stereo separation or spaciousness and can cause listening fatigue.

When listening with speakers, sound from the right speaker also arrives at the left ear (RL), with a small time delay though. This time delay is known as interaural time difference (ITD). Additionally, there's a difference in level known as interaural level difference (ILD). In the image above, line thickness indicates these level differences.

In reality, things aren't that simple. The level difference, for example, is not constant because the head obstructs higher frequencies a lot better than low frequencies (aka head shadow). While at low frequencies the attenuation can be as low as and even lower than 3 dB, it can reach up to about 20 dB at high frequencies.
To make things more complex, both the ITD and ILD change depending on the angle of the speakers.

As the delay and level differences are reduced to zero, the left and right speakers merge into a single center speaker (effectively mono).

How is this DSP component different from ...
Compared to simple crossfeed effects, this implementation does not only crossfeed bass and lower mids but all frequencies up to Fs/2.
By configuring crossfeed levels for both low and high frequencies, this DSP can be set up to mimic the acoustic shadow of your own head.
-> For example, hi-hat sounds panned hard to the left/right on a recording can be moved "out of the head" coherently with all the other instruments.

The configuration dialog looks like this:


Please give it a try and let me know what you think, thanks.

This post has been edited by xnor: Sep 19 2011, 22:58
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Posts in this topic
- xnor   foo_dsp_xfeed   Sep 12 2011, 18:50
- - mudlord   Nice. Put it right in and worked outta the box.   Sep 13 2011, 11:46
- - Steve Forte Rio   Can't hear any considerable differences from ...   Sep 13 2011, 14:01
- - xnor   I updated the first post which should hopefully an...   Sep 13 2011, 15:48
- - Steve Forte Rio   Thanks. Please, add the "Load Defaults" ...   Sep 13 2011, 20:14
- - markanini   This one really nails the illusion of listening to...   Sep 14 2011, 04:16
- - markanini   xnor, after listening to my favorite albums throug...   Sep 16 2011, 00:37
- - xnor   I'm glad you enjoy it as much as I do. The de...   Sep 16 2011, 15:47
|- - markanini   QUOTE (xnor @ Sep 16 2011, 16:47) I'm...   Sep 17 2011, 01:14
- - j_b   Fascinating. Headphone users are using DSP to add ...   Sep 16 2011, 23:18
|- - xnor   QUOTE (j_b @ Sep 17 2011, 00:18) Fascinat...   Sep 16 2011, 23:41
|- - j_b   QUOTE (xnor @ Sep 16 2011, 16:41) ...addi...   Sep 17 2011, 00:12
|- - xnor   QUOTE (j_b @ Sep 17 2011, 01:12) But that...   Sep 17 2011, 00:26
|- - j_b   QUOTE (xnor @ Sep 16 2011, 17:26) There a...   Sep 17 2011, 03:53
|- - xnor   QUOTE (markanini @ Sep 17 2011, 02:14) Th...   Sep 17 2011, 12:28
|- - markanini   QUOTE (xnor @ Sep 17 2011, 13:28) 0.15/(2...   Sep 17 2011, 14:22
- - jaro1   Headphone DSPs have had always my interest, so tha...   Sep 18 2011, 18:36
|- - xnor   QUOTE (jaro1 @ Sep 18 2011, 19:36) Does y...   Sep 18 2011, 19:30
- - jaro1   Thanks for your comment, i must definitely try you...   Sep 18 2011, 21:52
- - xnor   I gave it a try quite some time ago so I'll ha...   Sep 18 2011, 22:18
- - Sandrine   The positioning of instruments is indeed more agre...   Sep 20 2011, 13:24
|- - xnor   Sandrine, with the latest release you can adjust t...   Sep 20 2011, 14:37
- - Ihmemies   Thanks for this. It's interesting to find and...   Sep 21 2011, 00:38
- - xnor   QUOTE (jaro1 @ Sep 18 2011, 22:52) Howeve...   Sep 22 2011, 20:01
- - The Link   Sorry for being a little off topic. In the lack of...   Sep 22 2011, 21:19
- - xnor   Thanks for mentioning it, The Link. Even a simple ...   Sep 22 2011, 22:30
- - kumbbl   first of all thanks for this very nice plugins - e...   Sep 23 2011, 13:12
|- - xnor   QUOTE (kumbbl @ Sep 23 2011, 14:12) One q...   Sep 23 2011, 13:51
- - jaro1   Thanks for commenting TB Isone, glad to hear your ...   Sep 24 2011, 12:59
- - Fool_on_the_hill   hello. Thank you xnor for another great crossfeed ...   Oct 5 2011, 14:59
- - xnor   I always found that dolbyhp adds quite some amount...   Oct 5 2011, 15:42
- - markanini   Xnor, do you recomend having crossfeed turned on o...   Oct 5 2011, 16:18
|- - xnor   QUOTE (markanini @ Oct 5 2011, 17:18) Xno...   Oct 5 2011, 17:24
|- - markanini   QUOTE (xnor @ Oct 5 2011, 18:24) QUOTE (m...   Oct 6 2011, 20:51
- - jaro1   Finally i've had an opportunity to try xfeed a...   Oct 6 2011, 20:12
- - jaro1   I wanted slightly revise my last comment in favour...   Oct 12 2011, 19:31
|- - xnor   QUOTE (markanini @ Oct 6 2011, 21:51) [.....   Oct 12 2011, 20:21
|- - jaro1   QUOTE (xnor @ Oct 12 2011, 21:21) ...but ...   Oct 13 2011, 07:35
- - vittau   Thank you xnor, both your crossfeed and equalizer ...   Oct 28 2011, 20:36
|- - xnor   Noted. You're right. I think it would already ...   Oct 29 2011, 09:37
- - markanini   xnor, Do you think your crossfeed works best with ...   Nov 9 2011, 19:17
- - xnor   Hmm I'd say that the reduction of stereo separ...   Nov 12 2011, 18:18
- - markanini   Let me check if I understood your point, so headph...   Nov 13 2011, 01:10
- - markanini   Did further searching, the ID-HRTF above has one l...   Nov 13 2011, 10:48
- - markanini   Xnor, is the HF cutoff preset or dependent on othe...   Dec 19 2011, 23:31
- - extrabigmehdi   Thanks, I found this component very easy to tweak...   Feb 3 2012, 19:09
|- - xnor   QUOTE (extrabigmehdi @ Feb 3 2012, 20:09)...   Feb 3 2012, 19:33
|- - extrabigmehdi   QUOTE Well that's hard to say. Those ILD value...   Feb 3 2012, 20:00
- - markanini   I've compared head-fit to xfeed a while back. ...   Feb 15 2012, 11:42
- - YellowOnion   Do you take into account speaker distance from Lis...   Oct 12 2012, 01:01
- - markanini   A new contender? http://europe.beyerdynamic.com/vi...   Apr 12 2013, 04:34
- - Propheticus   I find the effects to sound quite realistic (espec...   Apr 12 2013, 11:55
|- - extrabigmehdi   QUOTE (Propheticus @ Apr 12 2013, 10:55) ...   Apr 12 2013, 13:33
- - Propheticus   This* is not a crossfeed however, it is a room vir...   Apr 12 2013, 14:30
|- - extrabigmehdi   QUOTE (Propheticus @ Apr 12 2013, 13:30) ...   Apr 12 2013, 20:58
- - rowbee   Xnor you're awesome! This plugin is brill...   Feb 7 2014, 03:12


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