search for: ambisonia

2008/9/25 e deleflie <edeleflie at gmail.com>: > Hi Vorbis-dev, > Hi, > I've been on this list for a couple of weeks, but its been quiet, so I > dont know who is who. > > My name is Etienne Deleflie, I am the creator of www.ambisonia.com, > and I am (together with the Ambisonic community) looking for a > 'delivery format' for Ambisonic data. > > There has been a lot of discussion on the sursound list (and even more > off-list) about how Ambisonics could be wrapped into Vorbis compressed > streams. A gr...

> Also, there has been some recent work on channel mappings for OggPCM (uncompressed PCM data in an Ogg container), which may be related: Our proposal involves only Vorbis. Uncompressed PCM Ambisonics is already well catered for. > It is indeed related. We are proposing a different ambisonic channel scheme (not speaker mapping though) called N3D (different to the usual FuMa scheme). The

Hi Flac Developers, My name is Etienne Deleflie, I'm the founder of http://www.ambisonia.com and, more recently, http://soundofspace.com. Myself and the community I serve are looking for a lossless file format that can encapsulate ambisonic encoding. To this end a specification has been drafted, and is nearing stability, that describes practical features designed to get the most out...

Hi all, My apologies for the confusion ... but I am re-naming this thread again because the proposal doesn't come from Ambisonia. As the founder of Ambisonia I have only been 'mediating' between some members of the ambisonic community ... so it would be wrong to associate the spec with Ambisonia. To clarify. This is what the spec proposes: - that Mapping = 1 means the contents are ambisonic - that the Vorbis encode...

On 2/28/07, Ivo Emanuel Gon?alves <justivo@gmail.com> wrote: > On 2/28/07, Ralph Giles <giles@xiph.org> wrote: > > Well, there are todo pages at wiki.xiph.org, but I meant more in the > > community folklore sense. My point is a roadmap doesn't help much unless > > there are people committed to making things happen. That's been the > > problem with a

On 2/28/07, Ivo Emanuel Gon?alves <justivo@gmail.com> wrote: > On 2/28/07, Ralph Giles <giles@xiph.org> wrote: > > Well, there are todo pages at wiki.xiph.org, but I meant more in the > > community folklore sense. My point is a roadmap doesn't help much unless > > there are people committed to making things happen. That's been the > > problem with a

...39; chunk), and in the long term we could register an ID for a METADATA_BLOCK_APPLICATION. If you are interested in the ".amb" spec then the non-standard GUIDs are described at: http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html and the rest of the description is at: http://www.ambisonia.com/Members/mleese/file-format-for-b-format/ There are currently over 100 pieces in the ".amb" format available for free download. Most are full-sphere surround sound. Visit http://www.ambisonia.com/ Regards, Martin -- Martin J Leese E-mail: martin.leese@stanfordalumni.org Web: http:/...

Not sure if this belongs here or in flac-dev. I am subscribed to both, so flop it over if fits better over there. Looking at the Changelog for FLAC 1.2.1 (17-Sep-2007), it says: "With the new --keep-foreign-metadata in flac, non-audio RIFF and AIFF chunks can be stored in FLAC files and recreated when decoding." Where can I find more detail on what is a

...ot; and "data" chunks as far as chunk Id's and lengths where concerned and the overall file length is correct. The only issue is that the "data" chunk started and ended with a sample from the same channel. I have read through some of the documentation provided at http://www.ambisonia.com/Members/mleese/file-formats/ and especially the McGill university WAVE specification and the Microsoft/IBM documentation and can't find anywhere that it says that there needs to be an even number of samples, just that they need to be interleaved. I may have missed something along the way i...

--- On Thu, 9/17/09, e deleflie <edeleflie at gmail.com> wrote: > Hi Flac Developers, > > My name is Etienne Deleflie, I'm the founder of > http://www.ambisonia.com and, more recently, http://soundofspace.com. > > Myself and the community I serve are looking for a lossless file > format that can encapsulate ambisonic encoding. To this end a > specification has been drafted, and is nearing stability, that > describes practical features desi...

...do it though. Etienne On Mon, Sep 21, 2009 at 11:57 AM, Josh Coalson <xflac at yahoo.com> wrote: > --- On Thu, 9/17/09, e deleflie <edeleflie at gmail.com> wrote: >> Hi Flac Developers, >> >> My name is Etienne Deleflie, I'm the founder of >> http://www.ambisonia.com and, more recently, ?http://soundofspace.com. >> >> Myself and the community I serve are looking for a lossless file >> format that can encapsulate ambisonic encoding. To this end a >> specification has been drafted, and is nearing stability, that >> describes prac...

...ot; and "data" chunks as far as chunk Id's and lengths where concerned and the overall file length is correct. The only issue is that the "data" chunk started and ended with a sample from the same channel. I have read through some of the documentation provided at http://www.ambisonia.com/Members/mleese/file-formats/ and especially the McGill university WAVE specification and the Microsoft/IBM documentation and can't find anywhere that it says that there needs to be an even number of samples, just that they need to be interleaved. I may have missed something along the way i...

...ambisonics? Something to sanity check/inform equipment selections of someone building My First Ambisonics Rig? Not at all Monty. This is an important question and I am ashamed to say I can't point you to a good answer. In the meantime, have a look at Permananent Ambisonic Systems from www.ambisonia.com\Members\ricardo Using identical speakers gives much better results, though matched phase is sufficient. > (i.e. reversing phase on a driver breaks it completely) This isn't true and would invalidate about 70% of good small speakers. My choice would be The Core on the above page. If...

..., and people don't agree on one thing for > some reason. (perhaps being stubborn) I was a little surprised that you did not discuss the ".amb" format as this is the official file format for Ambisonic B-Format.(3) This has also been used in the wild for many years, particularly at Ambisonia.com.(4) It uses Furse-Malham component ordering and MaxN normalization. (It also only works up to third-order.) Note that Vorbis is lossy. Ambisonics is picky about low-frequency phase and, as far as I know, nobody has checked the extent to which this is preserved in Vorbis. This may or may no...

..."data" chunks as far as chunk Id's and lengths where concerned and the overall file length is correct. The only issue is that the "data" chunk started and ended with a sample from the same channel. I have read through some of the documentation provided at http://www.ambisonia.com/Members/mleese/file-formats/ and especially the McGill university WAVE specification and the Microsoft/IBM documentation and can't find anywhere that it says that there needs to be an even number of samples, just that they need to be interleaved. I may have missed something along...

"Alex Brims" <alex.brims@gmail.com> wrote: > Ok, we actually worked this out - there were 2 extra bytes doing nothing at > the end of the files. Opening the file in SoundForge and saving it (without > changing it) took off the extra bytes and allowed the file to convert to > FLAC. > > Thanks to everyone who emailed me suggestions. > > Is there a decent

...nnels but a channel mask of zero. Clearly, the channel mask does not always implicitly contain the number of channels. Not every FLAC or WAVEFORMATEXTENSIBLE file will contain speaker feeds. The FLAC specification needs to allow for this. The Microsoft specification can be viewed at: http://www.ambisonia.com/Members/mleese/file-formats/multichaud.pdf/view The underlying problem is that FLAC has got itself into a mess over channel assignments. The number of channels is specified in the METADATA_BLOCK_STREAMINFO, but using only three bits. (Three bits is insufficient for the channel assignment, e...

Where can I find the Header file or whatever which specifies the "Mapping" flag. In feb - apr 2007, there was a lot of discussion about Ambisonics and Monty kindly stated that Mapping = 1 ; Denotes and Ambisonic file as opposed to = 0 which is 1 speaker/ 1 channel Has this been written explicitly into the standard? Which standard should I be looking at?