Binaural recording + virtual 3D sound source + CMSS-3D
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Binaural recording + virtual 3D sound source + CMSS-3D
by Francois Montignies
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Re: Binaural recording + virtual 3D sound source + CMSS-3D
by Daniel PEACOCK
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RE: Binaural recording + virtual 3D sound source + CMSS-3D
by Francois Montignies
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Hi Dan , I am using a XFi Platinum, or sometimes an Audigy 2 for testing. Please tell me that one of these two can play an OpenAL application with HRTF [On] for mono source, without upmixing stereo source. I really thought that upmix and downmix was only for nonOpenAL sound files. I thought that stereo buffer in OpenAL application was not spatialized at all, but it is still 3D virtualized if I understood well. Could you explain me how the sound card (XFi for example) will spatialize an OpenAL application when CMSS-3D is [off] ? If both features (HRTF for mono buffer, upmix of stereo buffers) are linked in CMSS-3D function, maybe could you give me a trick in the OpenAL code ? Thank you, Francois HITlabNZ -----Original Message----- From: Daniel PEACOCK [mailto:dpeacock@...] Sent: Thu 10/15/2009 3:44 AM To: Francois Montignies Cc: openal@... Subject: Re: [Openal] Binaural recording + virtual 3D sound source + CMSS-3D Hi Francois, Which soundcard are you using? >> When I enable Headphones CMSS-3D it adds a processing artifact on >> my binaural recordings. I think it might be a cross-feed algorythm. >> Is there a way to keep my original binaural track (that means left >> channel to left ear, right channel to right ear) and add a 3D source >> with CMMSS-3D "On" ? The "CMSS-3D" feature includes upmix technology and enables high-quality 3D Audio virtualization. Depending upon the soundcard you are using it may or may not be possible to separate these two features unfortunately. >> What would be the result if I turn off CMSS-3D and only select "headphones" reproduction, do I lose the HRTF for the virtual 3D speaker ? I believe the answer depends on the soundcard you are using. Dan Creative Labs (UK) Ltd. Notice The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying or distribution of the message, or any action taken by you in reliance on it, is prohibited and may be unlawful. If you have received this message in error, please delete it and contact the sender immediately. Thank you. Creative Labs UK Ltd company number 2658256 registered in England and Wales at 79 Knightsbridge, London SW1X 7RB Francois Montignies <francois.montignies@canter bury.ac.nz> To Sent by: openal@... openal-bounces@... cc reative.com Subject [Openal] Binaural recording + virtual 3D sound 10/12/2009 05:07 AM source + CMSS-3D Hi, I would be really happy if someone could tell me if it is possible to deal with binaural recordings as background sound environments. I work for a research project in which we only use headphones reproduction. Binaural recording is therefore a solution to have a realistic sound environment. We would like to add a virtual speaker with 3D coordinates that we can vary. In my OpenAL source code I have : - a stereo buffer for the binaural source (no spatialization with OpenAL) - a mono buffer for the virtual source (3D definition with OpenAL) Problem is : When I enable Headphones CMSS-3D it adds a processing artifact on my binaural recordings. I think it might be a cross-feed algorythm. Two questions : - Is there a way to keep my original binaural track (that means left channel to left ear, right channel to right ear) and add a 3D source with CMMSS-3D "On" ? - What would be the result if I turn off CMSS-3D and only select "headphones" reproduction, do I lose the HRTF for the virtual 3D speaker ? Thanks for any help, Francois, HITlabNZ This email may be confidential and subject to legal privilege, it may not reflect the views of the University of Canterbury, and it is not guaranteed to be virus free. If you are not an intended recipient, please notify the sender immediately and erase all copies of the message and any attachments. Please refer to http://www.canterbury.ac.nz/emaildisclaimer for more information. _______________________________________________ Openal mailing list Openal@... http://opensource.creative.com/mailman/listinfo/openal ForwardSourceID:NT00075872 This email may be confidential and subject to legal privilege, it may not reflect the views of the University of Canterbury, and it is not guaranteed to be virus free. If you are not an intended recipient, please notify the sender immediately and erase all copies of the message and any attachments. Please refer to http://www.canterbury.ac.nz/emaildisclaimer for more information. _______________________________________________ Openal mailing list Openal@... http://opensource.creative.com/mailman/listinfo/openal  graycol.gif (144 bytes) Download Attachment pic18060.gif (1K) Download Attachment ecblank.gif (62 bytes) Download Attachment |
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RE: Binaural recording + virtual 3D sound source + CMSS-3D
by Daniel PEACOCK
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Hi Francois, I believe that the XFi Platinum card will be able to do this - but I don't think the Audgy 2 can. With CMSS-3D 'On' (to enable the higher-quality 3D spatialization algorithms) you can use an EAX 5.0 extension call to tell an AL Source playing stereo content that it should not be upmixed. If you are interested in this approach then send me a private email and I can give you the details. Dan Creative Labs (UK) Ltd. Notice The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying or distribution of the message, or any action taken by you in reliance on it, is prohibited and may be unlawful. If you have received this message in error, please delete it and contact the sender immediately. Thank you. Creative Labs UK Ltd company number 2658256 registered in England and Wales at 79 Knightsbridge, London SW1X 7RB Francois Montignies <francois.montign To ies@... Daniel PEACOCK .nz> <dpeacock@...> cc 10/14/2009 10:57 openal@... PM Subject RE: [Openal] Binaural recording + virtual 3D sound source + CMSS-3D Hi Dan , I am using a XFi Platinum, or sometimes an Audigy 2 for testing. Please tell me that one of these two can play an OpenAL application with HRTF [On] for mono source, without upmixing stereo source. I really thought that upmix and downmix was only for nonOpenAL sound files. I thought that stereo buffer in OpenAL application was not spatialized at all, but it is still 3D virtualized if I understood well. Could you explain me how the sound card (XFi for example) will spatialize an OpenAL application when CMSS-3D is [off] ? If both features (HRTF for mono buffer, upmix of stereo buffers) are linked in CMSS-3D function, maybe could you give me a trick in the OpenAL code ? Thank you, Francois HITlabNZ -----Original Message----- From: Daniel PEACOCK [mailto:dpeacock@...] Sent: Thu 10/15/2009 3:44 AM To: Francois Montignies Cc: openal@... Subject: Re: [Openal] Binaural recording + virtual 3D sound source + CMSS-3D Hi Francois, Which soundcard are you using? >> When I enable Headphones CMSS-3D it adds a processing artifact on >> my binaural recordings. I think it might be a cross-feed algorythm. >> Is there a way to keep my original binaural track (that means left >> channel to left ear, right channel to right ear) and add a 3D source >> with CMMSS-3D "On" ? The "CMSS-3D" feature includes upmix technology and enables high-quality 3D Audio virtualization. Depending upon the soundcard you are using it may or may not be possible to separate these two features unfortunately. >> What would be the result if I turn off CMSS-3D and only select "headphones" reproduction, do I lose the HRTF for the virtual 3D speaker ? I believe the answer depends on the soundcard you are using. Dan Creative Labs (UK) Ltd. Notice The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying or distribution of the message, or any action taken by you in reliance on it, is prohibited and may be unlawful. If you have received this message in error, please delete it and contact the sender immediately. Thank you. Creative Labs UK Ltd company number 2658256 registered in England and Wales at 79 Knightsbridge, London SW1X 7RB Francois Montignies <francois.montignies@canter bury.ac.nz> To Sent by: openal@... openal-bounces@... cc reative.com Subject [Openal] Binaural recording + virtual 3D sound 10/12/2009 05:07 AM source + CMSS-3D Hi, I would be really happy if someone could tell me if it is possible to deal with binaural recordings as background sound environments. I work for a research project in which we only use headphones reproduction. Binaural recording is therefore a solution to have a realistic sound environment. We would like to add a virtual speaker with 3D coordinates that we can vary. In my OpenAL source code I have : - a stereo buffer for the binaural source (no spatialization with OpenAL) - a mono buffer for the virtual source (3D definition with OpenAL) Problem is : When I enable Headphones CMSS-3D it adds a processing artifact on my binaural recordings. I think it might be a cross-feed algorythm. Two questions : - Is there a way to keep my original binaural track (that means left channel to left ear, right channel to right ear) and add a 3D source with CMMSS-3D "On" ? - What would be the result if I turn off CMSS-3D and only select "headphones" reproduction, do I lose the HRTF for the virtual 3D speaker ? Thanks for any help, Francois, HITlabNZ This email may be confidential and subject to legal privilege, it may not reflect the views of the University of Canterbury, and it is not guaranteed to be virus free. If you are not an intended recipient, please notify the sender immediately and erase all copies of the message and any attachments. Please refer to http://www.canterbury.ac.nz/emaildisclaimer for more information. _______________________________________________ Openal mailing list Openal@... http://opensource.creative.com/mailman/listinfo/openal ForwardSourceID:NT00075872 This email may be confidential and subject to legal privilege, it may not reflect the views of the University of Canterbury, and it is not guaranteed to be virus free. If you are not an intended recipient, please notify the sender immediately and erase all copies of the message and any attachments. Please refer to http://www.canterbury.ac.nz/emaildisclaimer for more information. (See attached file: graycol.gif)(See attached file: pic18060.gif)(See attached file: ecblank.gif) ForwardSourceID:NT0007625E _______________________________________________ Openal mailing list Openal@... http://opensource.creative.com/mailman/listinfo/openal graycol.gif (144 bytes) Download Attachment pic18060.gif (1K) Download Attachment ecblank.gif (62 bytes) Download Attachment |
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