Crosstalk cancellation

Prune · 30th November 2004, 02:01 PM

Are there any free or open source crosstalk cancellation programs, so that binaural recordings can be listened to over speakers? Any I've found, like WaveSurround, are pay-for; as for hardware options, they are very expensive.

Wodgy · 30th November 2004, 02:40 PM

Are you looking for crosstalk cancellation, or are you looking for an inverse HRTF program? You'd need the latter to remove the full set of head effects from a binaural recording. There are some sets of public-domain HRTF data available online, though I don't have the links offhand. Seems to me that it would be straightforward to compute the inverse filters and apply them to your music.

(How many binaural recordings do you have anyway? Just curious.)

Prune · 30th November 2004, 06:46 PM

That is not correct. Indeed, it's the other way around, where non-binaural recordings are used you need additional processing. See for example Gardner's PhD thesis.

Wodgy · 30th November 2004, 07:50 PM

I'm not up for reading through Ph.D. theses right now. Can you give me a brief reasoning of why this is wrong? Are we both using the same definition of "binaural"? I'm assuming you mean two microphones placed on a simulated head, not a generic dual mic stereo recording arrangement. How do you subtract away the head and pinna effects (occlusion, diffraction) if you don't have an HRTF to work with?

fcserei · 30th November 2004, 11:32 PM

Prune, IMHO you are wrong.

BTW an inexpensive and surprisingly good HW implementation is the Creative Playworks PS2000. Just scrap the speakers and the woofer and use real speakers and woofer in a + - 5 deg setup. And you need a quite dead room too.

It can do crosstalk cancellation based on the Dimagic (ISVR origin) technology and additional inverse HRTF processing to play back binaural recordings over the crosstalk cancelled speakers.

Marantz is also promised an ISVR research based technology (OPSODIS) for crosstalk cancellation only by next spring.

Frank

Prune · 1st December 2004, 09:25 AM

Quote:

Just scrap the speakers and the woofer and use real speakers and woofer

Wha?!

fcserei · 1st December 2004, 11:23 AM

The DSP is very good, but do not expect anyting accurate from the speakers. Just use quality speakers instead of these.

Prune · 1st December 2004, 01:18 PM

I remember the stereo dipole demo from an ISVR page. But searching for OPSODIS using Google, all I'm finding are Japanese pages. Do you have a pointer to the info?

fcserei · 1st December 2004, 04:14 PM

It is Japanese only yet. Search for Optumum Source Distribution for the original technology.

ashok · 19th January 2006, 01:44 PM

Anyone heard the systems shown at www.dimagic.com ?

In spite of positional restrictions , how does it sound ?
Any experiments.
Cheers.

30th November 2004, 02:01 PM	#1
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	Crosstalk cancellation Are there any free or open source crosstalk cancellation programs, so that binaural recordings can be listened to over speakers? Any I've found, like WaveSurround, are pay-for; as for hardware options, they are very expensive.

19th January 2006, 01:44 PM	#10
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	www.dimagic.com Anyone heard the systems shown at www.dimagic.com ? In spite of positional restrictions , how does it sound ? Any experiments. Cheers. __________________ AM

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30th November 2004, 02:40 PM	#2
Wodgy diyAudio Member Join Date: Jul 2003	Are you looking for crosstalk cancellation, or are you looking for an inverse HRTF program? You'd need the latter to remove the full set of head effects from a binaural recording. There are some sets of public-domain HRTF data available online, though I don't have the links offhand. Seems to me that it would be straightforward to compute the inverse filters and apply them to your music. (How many binaural recordings do you have anyway? Just curious.)

30th November 2004, 06:46 PM	#3
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	That is not correct. Indeed, it's the other way around, where non-binaural recordings are used you need additional processing. See for example Gardner's PhD thesis.

30th November 2004, 07:50 PM	#4
Wodgy diyAudio Member Join Date: Jul 2003	I'm not up for reading through Ph.D. theses right now. Can you give me a brief reasoning of why this is wrong? Are we both using the same definition of "binaural"? I'm assuming you mean two microphones placed on a simulated head, not a generic dual mic stereo recording arrangement. How do you subtract away the head and pinna effects (occlusion, diffraction) if you don't have an HRTF to work with?

30th November 2004, 11:32 PM	#5
fcserei diyAudio Member Join Date: Sep 2002 Location: US	Prune, IMHO you are wrong. BTW an inexpensive and surprisingly good HW implementation is the Creative Playworks PS2000. Just scrap the speakers and the woofer and use real speakers and woofer in a + - 5 deg setup. And you need a quite dead room too. It can do crosstalk cancellation based on the Dimagic (ISVR origin) technology and additional inverse HRTF processing to play back binaural recordings over the crosstalk cancelled speakers. Marantz is also promised an ISVR research based technology (OPSODIS) for crosstalk cancellation only by next spring. Frank

1st December 2004, 01:18 PM	#8
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	I remember the stereo dipole demo from an ISVR page. But searching for OPSODIS using Google, all I'm finding are Japanese pages. Do you have a pointer to the info?

1st December 2004, 04:14 PM	#9
fcserei diyAudio Member Join Date: Sep 2002 Location: US	It is Japanese only yet. Search for Optumum Source Distribution for the original technology.