Re: [Sursound] Ambisonic hydrophone?

2013-02-19 Thread Dave Malham
Hi, The trouble with Angelo's kit is that it's not really hi-fi. Works well for what it was designed for (noise pollution research) but not really good enough for serious audio. Because it's based on differencing omni's to generate directional responses it has a relatively limited bandwidth

Re: [Sursound] Ambisonic hydrophone?

2013-02-19 Thread Dave Malham
Angelo's paper relating to this is at http://www.angelofarina.it/Public/UAM-2011/ Dave On 19 February 2013 04:03, Marc Lavallée m...@hacklava.net wrote: umashankar manthravadi umasha...@hotmail.com a écrit : angelo farina has exactly the beast you are looking for. he had a power point

Re: [Sursound] Sound Field Microphone

2013-02-19 Thread Jörn Nettingsmeier
On 02/18/2013 02:58 PM, Michael Chapman wrote: Good Morning Everyone, I'm interesting to buy a Sound Field Microphone but I don't have any experience in this field. Could you recommend me some models or brands according to your experience? There are many on here more expert than I. But to

Re: [Sursound] Any experience with dome acoustics?

2013-02-19 Thread Peter Lennox
Just a quick one: It seems to me that a dome could be interesting used as a kind of wavefield synthesis device. Domes have the interesting property of focussing sound at a point that is opposite the source, as it were. So you can create a 'holosonic' point source right next to someone's ear

Re: [Sursound] Any experience with dome acoustics?

2013-02-19 Thread Augustine Leudar
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Re: [Sursound] Any experience with dome acoustics?

2013-02-19 Thread Peter Lennox
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Re: [Sursound] Any experience with dome acoustics?

2013-02-19 Thread umashankar manthravadi
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Re: [Sursound] Any experience with dome acoustics?

2013-02-19 Thread Augustine Leudar
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Re: [Sursound] Gran Sasso - first impressions

2013-02-19 Thread Martin Leese
Gerard Lardner wrote: Here's a suggestion: a place that is publicly-accessible, but is under threat of being demolished. It's Achill Henge, a modern copy of much of Stonehenge but built on Achill Island, off the west coast of Ireland. There are a number of Stonehenge replicas dotted around

Re: [Sursound] Ambisonic hydrophone?

2013-02-19 Thread Martin Leese
Fons Adriaensen wrote: Don't know what Len will think of it, but putting a Tetramic (or any such mic) in a plastic bag isn't likely to produce anything usable. Basic problem is that the acoustic impedance of water is around 3400 times higher than that of air, so the water/air interface will

Re: [Sursound] Gran Sasso - first impressions

2013-02-19 Thread Richard Dobson
Needless to say, it would be even more interesting if they actually posted the IRs somewhere! If they have, it is very well hidden. Richard Dobson On 19/02/2013 17:28, Martin Leese wrote: ... Also, it looks like the University of Salford have already measured IRs of the original Stonehenge

Re: [Sursound] Ambisonic hydrophone?

2013-02-19 Thread Dave Malham
The trouble with the sort of materials used in condoms is that they are inherently stretchy. Under any sort of pressure (more than a quite small depth of water) the material presses through any holes and either (a) rips or be (b) comes into contact with the diaphragm which is potentially almost

Re: [Sursound] Ambisonic hydrophone?

2013-02-19 Thread Dave Malham
Oh, and a couple of other tips for anyone wanting to use condoms for protecting microphones - wipe as much of the lubricant off as you can before use (it's a b***er to remove from microphone) and use the featherlite variety for maximum acoustic transparence. Dave On 19 February 2013 21:46,