Mono makes the best reproduction...

[syntheticwave]

_____________________________________

That seems a little bit crazy, but each source themselves is a mono source. It makes no sense transmitting a mono source signal in 7.1 or more channels. We want to restore the spatial behavior of the sonic field in that matter. But what ineffective way, transmitting the same signal more as one times, only because amplitude and phase differs a little. Let my describe a more useful way:

The spatial sound field in the recording room becomes initiated from direct wave, radiated by the sound source. That wave front will reflected by all surfaces in the recording room. We can imagine those reflections by mirror source model. Behind each reflecting surface such mirror sources occur. Its spatial position dependent from listener position, its signal become modified by the surface reflection factors.

Those mirror sources situated all around the listener, the reflections arrive from all directions. That’s decidedly the spatial impression. Reducing those spatial distribution of the mirror sources upon the horizontal level, moreover upon a few single channels inevitably caused a significantly loss of spatial impression!

More meaningful is the way, transmitting only the pure mono signal of the source in addition to the reflection properties of the recording room. By principle of wave field synthesis the spatial sound filed become synthesizing much more accurate from that information’s. The procedure is described by Wikipedia or in drolly English, but with easily understandable animations by my website wave field synthesis- animated audio rendition procedure description . Such wfs- rendition systems installed in some cinemas currently. I was able to listen sometimes, the spatial impression incomparably more precise as conventionally reproduction. The virtually source has the ability to whisper directly into your ear, in principle is possible go around the virtually source hence.


Kind regards Helmut

[John7]

Yes indeed!

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[vader100]

With it for the first paragraph but then

[syntheticwave]

Originally Posted by vader100

With it for the first paragraph but then

...you mean only a little bit crazy ?

Regards Helmut

[eviljohn2]

In some ways, but of course if you're at a concert for example, the band aren't a point source on the stage - they're across the whole thing.

If it was all recorded in mono, you'd only know what it sounded like at that one place in the room and it would be remarkably difficult to amplify the instruments properly particularly if they're keyboards or vocals which need effects/compression/anything else applied to them.

[syntheticwave]

… but each single source remains mono source still. Of course you must include into the synthesis its directional radiation pattern and the actual source position on the stage and its actual main direction. You need for each source a separate channel for that. But if you synthesize it’s the early reflections in the recording room, the reproduction is much more accurate as by conventionally procedures. Of course you can apply all effects. The way is described by wikipedia or in google, search wave field synthesis. It is a very interesting topic, I promise.

Regards Helmut

[eviljohn2]

Originally Posted by syntheticwave

[color=black]… but each single source remains mono source still.
Regards Helmut

I don't totally agree with this. A drum could be a mono source, a drum kit could be a stereo source or more. It just isn't cut and dried unfortunately.

[syntheticwave]

Originally Posted by eviljohn2

I don't totally agree with this. A drum could be a mono source, a drum kit could be a stereo source or more. It just isn't cut and dried unfortunately.

..no, isnt a cut and dried opinion. Its absolutely right. For each drumset you must have its especially stored spatial behaviour for the synthesis.
B another way the principle has the possibility for synthesizing those radiation pattern from a number of point sources. But in that case you need a own (mono) transmitting channel for each item of the set. The superposition of the point sources from its correct virtually positions by the reproduction site deliver the correct spatial radiation.

[eviljohn2]

You may not have come across them, but the same principles are used in binaural recordings (to be played back through headphones) and in directing the audio from line-arrays in large PA systems.

Don't forget also that using stereo speakers can be much like your wave field depending on how the original recording was made. The difficulty is finding microphones appropriate to pick up the audio information at such distances and with the most desirable characteristics for the instruments.

[syntheticwave]

Originally Posted by eviljohn2

You may not have come across them, but the same principles are used in binaural recordings (to be played back through headphones) and in directing the audio from line-arrays in large PA systems.

Don't forget also that using stereo speakers can be much like your wave field depending on how the original recording was made. The difficulty is finding microphones appropriate to pick up the audio information at such distances and with the most desirable characteristics for the instruments.

Hi John

yes, the directed radiation concerning sound reinforcement very similar. Besides the MPEG4 based procedures are working in computer world are object based, likely the WFS recordings. Aproperiate software is able to restore the sound from dry single channel mono- records for each source in combination with the impulse response.

By tight mice spacing many of the recording difficulties doesn't arise. Moreover the procedure delivers a huge advantage in comparison regarding normal Loudspeaker reproduction:

I agree with you, in some cases conventionally reproduction today is very good. But only for the case, the rendition room acoustic is suitable. Those a very important transfer factor, but its properties widely unknown during the recording process. In normal dwellings the reproduction room reflection in less than 1 meter surmounting the direct radiation.

The main advantage of the synthesis by the “acoustic curtain” wave field synthesis loudspeaker field is the huge dimension of the resulting diaphragm. The listener becomes situated in the near field hence, because the room acoustic remains hardly influential for the reproduction.

Moreover the speaker field provides the possibility for balancing the properties. For example: If the recording room ceiling much high larger as the rendition room ceiling high, the rendition room ceiling reflection arrive too early by listener during conventionally reproduction. The synthesis is able to retard the directed radiation. By such way the ceiling high impression of the rendition room fits the recording room properties.

Wave field synthesis is introducing utterly new possibilities for the reproduction, aimed to establish a virtually copy of the recording room soundfield, indistingishable possibly in future.

Kind regards Helmut

[eviljohn2]

Have you noticed that the method (and handy animations) only work when the band are playing outside?

[syntheticwave]

Originally Posted by eviljohn2

Have you noticed that the method (and handy animations) only work when the band are playing outside?

Hi John,

the speaker field is able to produce focused source by arbitrary positions inside the playback room. Only the restriction arise the listener should not situated between the focused virtually source and the producing loudspeaker arrangement, because the convex wave fronts causing wrong ITD cues in that case. But the virtually band can play inside the rendition room, near by the listener. Sources or early reflections behind the listener may produce on help of the reflecting rendition room surfaces, similar the sound projectors. But it isn’t producing virtually loudspeakers by my proposual, but the source and its early reflections itself.
That does depict by animations by my site, unfortunately I am not allowed to placing links to the animations. If you searching “animated wave field synthesis principle” in Google, the first hit, klick to the fourth site (patent description), left side.

Regards Helmut