[Vorbis-dev] Re: Ambisonics in Ogg Vorbis

[Richard Lee]

Dear Martin,

> http://www.ambisonia.com/Members/etienne/Members/mleese/file-format-for-b-format

> "The W channel is attenuated by -3 dB (1/sqrt(2)) for all orders.  That is to say, a source at 45 degrees azimuth (zero elevation) would produce equal gains in W, X, and Y."

> As others have said, the available documentation is either opaque or uses conflicting notation.

Could you change the above statement on your page to say

"The W channel is a perfect omnidirectional microphone whose response is -3dB with respect to the on-axis response of the X, Y and Z signals.  A source at 45 degrees azimuth with zero elevation would produce equal signals in W, X and Y."

The original statement implies that there is an "original" W which is then attenuated to something which is not proper W in B-format.

This is causing lots of confusion in the Vorbis decoder discussions both on the forum and in private.

Thanks
Richard




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