Propeller Head Plaza

RE: Room Acoustics Technical Question

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tomservo

M

In Reply to: RE: Room Acoustics Technical Question posted by cuallito on September 28, 2022 at 21:43:28

Hi
Without a time scale it's hard to say, but if that is say 50ms of time or more, to me that doesn't look much like a speaker in a room but more like an ambience processor.

Normal room impulses, especially viewing as an ETC curve clearly show the loudspeakers impulse followed by a short time where there is no reflected sound, followed by the first second and third arrivals etc.

Follow Ups:

That's his design target Tom - Dave_K 13:59:17 11/05/22 (1)
Not the fuzz per se, but the decay envelope. I took it as a desire to make a smaller room sound like a big one. It's not an easy desire to satisfy.
- RE: That's his design target Tom - tomservo 06:39:19 11/06/22 (0)
  Ah, that wasn't clear from his post and why i thought it looked much more like a processor than a measurement of loudspeaker in a room..
  
  What he may want is something an acquaintance at work, Steve Barbor developed called LARES which creates that impression on command impression.
  
  My introduction with it was my partner at work Mike playing a trumpet on stage in a large church while the LARES operator took the room sound from a very dry semi-anechoic space slowly to a giant cave in a very believable manner.
  
  The trick is having multiple microphones in the room and DSP that de-correlates the sound, the opposite what what i have to do with speakers themselves.
  
  If one is concerned with "the stereo image", the impulse he showed would be TERRIBLE if that was 1 speaker at the listening position. The space between the first/ direct arrival and the trail of reflected signals that follow is critical for stereo imaging, with LARES, all the late energy is well behind that critical range (and why close sidewall reflections screw up the recording's image too).
  
  https://www.wikiaudio.org/haas-effect/
  
  Tom Danley
  Danley Sound Labs

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