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Old 23rd March 2008, 12:47 PM   #1
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Lightbulb Which amount of channels need the perfect rendition?

I say ONE for a single source.

Each source itself itís a mono source. Why we should broadcast a mono source signal in 7.1 or more channels? We want by that way to restore the spatial behavior of the sonic field. But what for a ineffective way, to transmit the same signal more as one times in that matter, only because amplitude and phase differs a little. Let my describe a much better way:

The spatial sound field in the recording room constitutes from the direct wave, radiated by the sound source. That wave front becomes reflected by all surfaces in the recording room. We can imagine those reflections by mirror source model. Each reflecting surface creates such mirror source behind. Its spatial position is dependent from the listener position, its signal become modified by the surface reflection factors.

The spatial distribution of those mirror sources are situated all around the listener, the reflections arrive by the listener from all directions. Thatís decidedly the spatial impression. Especially the relationships of direct wave and early strong reflections are vital for the perception.

Reducing those spatial distribution of the mirror sources upon the horizontal level, moreover upon a few single canals inevitably caused a significantly loss of spatial impression! Hence it makes much more sense, to transmit only the pure mono signal of the source. If stored the reflection purposes of the recording room by the rendition side, by principle of wave field synthesis the spatial sound filed become synthetisized much more accurate from that informationís.
The procedure is described by easily understandable animations by my website http://www.syntheticwave.de/Wavefieldsynthesis.htm or also shortly by Wikipedia.

Should that procedure in principle been able to create a virtual copy of the rendition room sound field in future? And whatís by your opinion the chance for the home market?


Kind Regards Helmut
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Old 23rd March 2008, 11:13 PM   #2
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Old 17th April 2008, 11:33 AM   #3
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Default Audio revolution?

thanks, cal.
But no reactions, the topic seems too complicated for reading shortly. Let my try a simply description:
---------------------------------------------------------------------------------

Imagine, you are situated in an opera house, best place, great tenor sings. Suddeny unexpected some bricklayers come in, build up a little housing around you. You are angrily, 56$ for the ticket and now you can hear nothing!hot:
But help is coming. One of the masons made holes into all walls, 10 cm in diameter, each on the other. Super, you hear Caruso as good as without the house. But now the electricians coming, sticking each hole by a loudspeaker. The sound is blocked again, but then, suddenly you hear likely the holes would be open. The electricians have supplied each speaker by a small amplifier and a microphone on the outside of the holes. Nothing is changed, speakers and microphones working well today.

The problem is only; you need one discrete channel for each micro, if you want to build the speakers into your living room walls. The second, mostly bigger problem is your wife, if you want to load all walls around in your living room by loudspeakers.:

The webside does describe nothing else as a solution for those two problems. It describes a way for build up the direct wave and the first early reflections from a dry recorded audio signal in the same spatial behavior as in the opera house. Thatís the core of each acoustic, by conventionally loudspeaker reproduction we are far away from this goal. The reverberation tail then becomes created from the impulse response, thatís practice in all studios today so. The impulse response becomes suppressed for the early reflection time, so that the first reflections donít produce again. The reverberation is coming from all directions by such approach, likely in the opera house. By using of reflecting walls, as it is known from the sound projectors, you can resign the loudspeakers all around, only those behind the picture screen remain. But the gadget isnít producing virtually loudspeakers, as do it the sound projectors. The speaker field simulates the source itself. That would be a little revolution in audio by my opinion.

The ony remaining problems woud be the other problems with your wife.

Greetings Helmut
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