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XM on AOL Radio

post #1 of 3
11/18/06 at 9:30am
Thread Starter 
Started sending AOL Radio with XM from the Internet to a receiver. The music selection is great.

Does anyone know the bitrate used?

And does anyone know, or have a logical guess, as to whether or not the Comcast digital music channels, Music Choice, is superior in sound quality to XM via AOL radio?

thanks
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post #2 of 3
3/1/07 at 8:22pm
I've scoured the internet and I cannot find this answer anywhere. I've read that directv uses 192kbps, but it's and mpeg2 variant....not nearly as efficient as aac or even mp3.
I know AOL Music uses AAC, I'm guessing 96 or 128kbps. If so I'm not sure if directv would be better or not.
I would love to find the actually bitrate AOL uses though.
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post #3 of 3
3/1/07 at 8:57pm
Quote:
Originally Posted by mikehall View Post

I've scoured the internet and I cannot find this answer anywhere. I've read that directv uses 192kbps, but it's and mpeg2 variant....not nearly as efficient as aac or even mp3.
I know AOL Music uses AAC, I'm guessing 96 or 128kbps. If so I'm not sure if directv would be better or not.
I would love to find the actually bitrate AOL uses though.

My understanding is it's 64kbps AAC for non-subscribers (to AOL, not to XM) and 128kbps AAC for AOL subscribers.

Directv is 192kbps MPEG-2

XM Online is 32kbps WMA9 at "low" and 64kbps WMA9 at "high"

And XM itself is anwhere from 24kbps (lowest) to 64kbps (XMHD channels) depending on the channel using AACplus, or HE-AAC (not AAC) with SBR.
http://en.wikipedia.org/wiki/HE-AAC
http://en.wikipedia.org/wiki/Spectral_Band_Replication

Also, their "source" music is 384kbps MPEG2 stored on IBM SANs (22TBs!!) http://www.rwonline.com/reference-ro...rwf_xm_1.shtml
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