Rockbox Development > Feature Ideas

Surround sound or better support for it(proposal)

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MajiKool Dragonâ„¢:
what if you output the bit stream through the regular headphone jack and built/made/used/found some sort of small/compact(well i guess it doesn't really matter how big or small it is since you would have to use speakers... headphones can only output two channels.) external decoder that can decode this signal and output four audio channels.

saratoga:

--- Quote from: blingcash on August 28, 2008, 09:52:45 AM ---what if you output the bit stream through the regular headphone jack

--- End quote ---

Headphone jacks are analog, not digital.

Multiplex:
Pink Floyd were famous for making stuff appear in 3D space in stereo recordings (I know not how) and there is lots of discussion about the phase and amplitude effects caused by the shape of the ear which may expalin how you work out what is in front and what is behind you.

It is entriely palusible that a lossless or a very well compressed recording may still carry the subtle information to give the spatial hints to the brain.

BUT if you read up on how the various lossy compression algorithms work you'll appreciate that it is unlikely, maybe it is the effects of the compression (artifacts) that are producing the spatial effects you are experiencing...

MajiKool Dragonâ„¢:

--- Quote from: saratoga on August 28, 2008, 10:42:55 AM ---
--- Quote from: blingcash on August 28, 2008, 09:52:45 AM ---what if you output the bit stream through the regular headphone jack

--- End quote ---

Headphone jacks are analog, not digital.

--- End quote ---

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.

soap:

--- 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.

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