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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: RE: Echo threshold posted by KlausR. on August 20, 2010 at 22:03:04:
>I’ve looked at the original paper and the setup Haas was using was two loudspeakers at 45º, half to the left and half to the right, one as direct sound source, the other as source for the single reflection. Both loudspeakers played at the same SPL. Once again, the single source/single reflection scenario. What happens in 2-channel stereo (phantom source, see also http://www.aes.org/e-lib/browse.cfm?elib=12718) with multiple natural reflections, has not yet been thoroughly investigated, to the best of my knowledge that is.<Mine either. As far as I know, all we have are the fusion experiments and the practical experience and lore, which suggests
- Side reflections -- all reflections -- add a sense of spaciousness to a stereophonic image, but alter timbre and broaden the image when within the 10-30 msec fusion range
- Rear reflections are important to the recreation of depth and distance cues (this has been established by informal experiment)
- Linkwitz's assertion that room reflections should be spectrally similar to the original so that the brain interprets them as reverberation, a formalization I think of some very old observations regarding the spatial fidelity of dipoles and omnidirectional loudspeakers but also I think an excellent result. Again, there have been informal experiments here, e.g., the observation that adding a rear-firing tweeter to a loudspeaker with limited high frequency dispersion improves spatial rendition.
Linkwitz did do an interesting experiment and make some measurements, but his papers on the subject are more in the manner of throwing out some hypotheses and a simple experiment than a systematic investigation. The design and implementation of the sort of experiment that would significantly expand our knowledge in the manner of Haas's fusion and intelligibility experiments would I think be fairly challenging.
Edits: 08/21/10
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Follow Ups
- RE: Echo threshold - josh358 06:34:16 08/21/10 (0)
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