XM HD Surround

On December 28, 2005, XM Satellite Radio announced that it had teamed up with Neural Audio Corporation to introduce XM HD Surround, XM HD Surround broadcasts XM channels in 5.1 digital surround sound. For a time XM broadcast a variety of special shows and live music performances in this format. According to the press release, Denon, Onkyo, Pioneer Electronics (USA) Inc., and Yamaha will introduce home audio systems capable of playing XM HD Surround in 2006.

The 5.1 surround sound is encoded in the stereo wave for transmission and is thus compatible with any mono/stereo/matrix-style receiver. If played on a 5.1 audio set equipped with Neural Surround decoder, the watermarks (i.e. spatial cues) in the waveforms are detected and the signal is recovered to its original 5.1 form. The technology is similar to parametric stereo, in which a mono signal is recovered to stereo. The bitrate for XMHD surround broadcasts is ~70 kbit/s using aacPlus from Coding Technologies.

XM HD Surround Channels (as of 12/11/08)
gollark: I sometimes get annoyed about living here given that the UK has many problems, but then I remember that actually quite a lot of countries have terrible governance too and ours is among the less bad.
gollark: Sort of. It's not finalised. Right now you can still travel and trade and wjatnot the same way.
gollark: Although Boris seems to want to mess it up now, at the most inopportune time.
gollark: Technically, we haven't exactly left yet.
gollark: Also several thousand something of diving gear.
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