Hello Thomas,
the goal of the procedure is differently system approach of conventionally the procedures, but also regarding the commonly known WFS approach. In any case the transmitting chain ends at the loudspeakers. The "Holophony" procedure wants to include the playback room properties. Final goal of audio transmittion should be, restore the signals at he ears of a listener in recording room at the ear of a listener in playback room, not any loudspeaker signals.
bruno putzeys wrote on Wed, 23 June 2010 05:12 |
The obstacle is fairly simple. If the WFS is only one "wall" of the room, it can only reproduce wave fronts traveling away from that wall into the room. The unwanted wavefronts are traveling into other directions and can't be canceled by any waves you generate from the "WFS wall". Your only solution would be to cover all six surfaces with transducers. Then you could do it.
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...that would be perfect without all doubt, but we have to consider the spouse acceptance factor.
Such huge WFS Loudspeaker field will radiate very directed. At WFS we have separate access at any of the signal components, we can change time and level for direct wave, first reflections and reverberation separately and in different manner. That opens the possibility for common systen from recording room and playback room. Per example, we can delay the radiation of the first reflections, radiate in playback wall direction. That will enlarge phe perceived size of the recording room. On the other hand, we can send the first reflections in wall dirrection before the direct wave is synthesized. Than we will perceive smaller room.
For subtract the playback rooms influence regarding first reflections, show this littel animation:
http://www.syntheticwave.de/pictures/WFS_transformation_prin ciple.swf
Of course that wave fronts will be reflected in playback room again. But in the near field of the speaker wall that will have not very disturbing effect, I hope.