Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Fons Adriaensen
On Sat, Jul 23, 2011 at 09:35:41PM +0100, dave.mal...@york.ac.uk wrote: > I have an interesting question (well, I think it's interesting). The > Soundfield microphone, like any directional microphone, has a boosted > bass response to close sounds. When listening to this through a speaker >

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Fons Adriaensen
On Sat, Jul 23, 2011 at 05:45:48PM -0700, Robert Greene wrote: > To make sense of this jargon, suppose a source is on the line that is > equistant from three of the capsules. Then its distance to those three > will always be the same, and if the source is reasonably far away the > distance to

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Sampo Syreeni
On 2011-07-24, Fons Adriaensen wrote: In a normal SF mic the effect could become significant if the distance between the capsules is a non-trivial fraction of the source distance AND of the wavelength, so not really at low F. Does that really matter, though? I mean, by definition XYZ contain

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Eric Benjamin
Robert Greene wrote: > there are VERY serious problems of other kinds with using it at the kinds of >distances > > (fractions of a meter less than 1/2 , much less often enough) where proximity > effect becomes really major. That is indeed true, except perhaps for the label of "Very". I first no

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Eric Benjamin
Sampo Syreeni wrote: > the problem is squarely in that the higher order components can't be fully >suppressed Exactly.  We can model the W output as being composed of a zeroth order (monopole) component plus a quadrapole component, which is frequency dependant.  A quadrapole has a squared prox

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Sampo Syreeni
On 2011-07-24, Eric Benjamin wrote: We can model the W output as being composed of a zeroth order (monopole) component plus a quadrapole component, which is frequency dependant. A quadrapole has a squared proximity effect, so for very close sources the proximity effect due to the quadrapole be

Re: [Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Sampo Syreeni
On 2011-07-25, Sampo Syreeni wrote: Especially because, as you pointed out for quadrupoles, the sensitivity goes up exponentially. Actually to be more exact, isn't the increase something like quadratic in order? -- Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front +358-50-57

[Sursound] the recent 2-channel 3D sound formats and their viability for actual 360 degree sound

2011-07-24 Thread Richard Lee
There's loadsa good stuff being discussed here. If I can comment on just one or two > When listening to this through a speaker rig, we hear this boost and tend to interpret it as meaning the sound is close especially in a dry acoustic with a Greene-Lee head brace etc., etc.,. However, sur