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04-25-2008 Post does not mapped to Knowledge Tree
Romy the Cat

Boston, MA
Posts 9,914
Joined on 05-28-2004

Post #: 1
Post ID: 7287
Reply to: 7287
Artificial Phases Randominisation.

We know that distance between a listener and live source in a concert hall creates HF attenuation along with adding of reverberations, changing harmonics/overtones balance and so on. Loudspeakers are in a way exposed to the same rules. If we conditionally accept that playback acoustic system radiate unanimous phase characteristic across the whole frequency range then it would not be difficult to visualize the distance between source and listener as the area where phases get randomized. I do not completely agree with this depicting but let for the sake of name calling to call the diffusion sound with distance as the Phases Randominisation.

So, what I am interested is to found out if it is possible to inflict an artificial Phases Randominisation effect to playback’s acoustic system. I mean to have a loudspeaker to produce sound that would be mimicking the sound of the same loudspeaker only located at, let say 10 time of distance. For sake of simplicity I would not consider the RT-60 parameters of listening room.

I am sure that by processing signal by some kind of digital means it would be possible to do with signal anything imaginable. Well, the intra-venous vitamins feeding, I am sure, can substitute for some the interest for French cuisine…. So, I wonder if any natural and accepted way to inflict the Phases Randominisation effect to signal. The heavier loading of output tube creates the effect of transients subsiding and increase of harmonics but it has very different feel then the increase the distance of listening. The Phases Randominisation had different dynamic of attestation and harmonics change then plate loading.

Anyhow, this is the subject that I would like to learn and to discover more.

Rgs, Romy the Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
05-01-2008 Post does not mapped to Knowledge Tree
Posts 225
Joined on 10-13-2007

Post #: 2
Post ID: 7343
Reply to: 7287
Ralph Glasgal´s site
Hello Romy!

Ralph Glasgal´s site is mainly dedicated to his ambiophonics method, but also has some information about perception of concert halls in general.

05-20-2020 Post does not mapped to Knowledge Tree

Posts 399
Joined on 07-05-2012

Post #: 3
Post ID: 25849
Reply to: 7287
Each instrument in the orchestra has an individual „Phase Ramdomisation“
Maybe we could do something for the string or horn section of an orchestra as what reaches the microphone is very „random“ including early and late reflections. I would imagine problems however with instruments with less „random“ pickup: trumpets, trombones, triangles, piccolo flutes. This is the problem that I have with most „ambiphonic“ or surround sound attempts. Even the „directional“ instruments are randomized.

Whenever I feel blue, I start breathing again.
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