Rockbox Development > Feature Ideas
Surround sound or better support for it(proposal)
MajiKool Dragonâ„¢:
--- Quote from: soap on September 07, 2008, 05:02:07 PM ---
--- Quote from: blingcash on September 07, 2008, 04:25:12 PM ---but it is still possible to out put a "digital" signal through this analog output. the signal itself would still be output as analog but it would be a digital-ish signal thats being output. you'd just need to make/modify a decoder to decode this "digital" signal.
--- End quote ---
A CD is 1,411,200 bps.
A MP3 might be 128,000 bps.
AC3 audio might be 448,000 bps.
The peak audio frequency your analog output can create is probably 22 or 24 Khz.
24,000 cycles per second.
Unless I am mistaken somewhere, you are going to need to figure out a way to dramatically compress your "surround sound" bitrate.
--- End quote ---
hmmm... you've got a point. ???
dreamlayers:
It's possible to output surround sound via headphones using just two channels. For example there's binaural recording, which records sound at the ears. Another example is some software which can downmix sound for headphones in a way which preserves 3D sense of direction. CyberLink PowerDVD and ffdshow can do this. It's not perfect but it's better than stereo. Ffdshow is open source and may have code which can be used in Rockbox.
Note that Rockbox can already play binaural recordings or files which have already been downmixed using such algorithms. They're just normal stereo files. Many binaural samples are available online.
markun:
--- Quote from: dreamlayers on September 27, 2008, 11:11:44 AM ---It's possible to output surround sound via headphones using just two channels. For example there's binaural recording, which records sound at the ears. Another example is some software which can downmix sound for headphones in a way which preserves 3D sense of direction. CyberLink PowerDVD and ffdshow can do this. It's not perfect but it's better than stereo. Ffdshow is open source and may have code which can be used in Rockbox.
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I once read a review of QSound where the reviewer first was very sceptical, but later blown away by the results. I haven't tried it for myself. I would also like to see such an algorithm for rockbox, especially for playing back Ambisonics recordings.
The crossfeed effect we have in rockbox moves the sound from inside my head to the front of it. I've heard that the effect doesn't work for everyone (since our ears and heads are different) so I wonder how well such a 3D simulation algorithm could work. Well.. as long as it works for my ears :P
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