For a
feeling of how reverberation/upmix with the The FIReverb Suite actually
may sound, this page gives mp3-examples
of stereo to stereo reverb/remix and stereo to 5-channel reverb/upmix
from anechoically recorded material, using a binaural
listening simulation. In addition, stereo and 5-channel binaural listening
simulation is explained and exemplified so in some
ways it is also a demonstration of CATT-Acoustic auralization.
Skip the explanation/background info,
go directly to demonstration.
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The anechoically
recorded music:
Mikael Ekholm has studied under Anders Ljungar-Chapelon och Sven-Olof Johansson in Malmö with emphasis on solo and orchestral music playing. He has the past summers given a number of chamber-music concerts in the south of Sweden, mostly in a flute/guitar duo setting but also with piano. Mikael is also about to complete a Master of Science degree with a thesis at the Dept. of Applied Acoustics, Chalmers University of Technology, Gothenburg (topic: comparison between scale- and computer- modeling auralization). Fredrik Runnström has studied under professor Göran Söllscher and Gunnar Spjuth. Fredrik performed chamber music in 1997 at the inauguration of Rikskonserter's new venue in Stockholm. During 1997 and 1998 he has also appeared as a chamber music performer in the Swedish National Radio channel 2. He now studies at the Royal Academy of Music in London. |
![]() During the summer of 1999 Duo Dulce gave
five Web page (in Swedish): Duo Dulce |
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Subsequent processing:
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Material | Processing | Sketch | Comment/mp3-file | Guidance to "state of mind" |
Pink noise | Binaural listening simulation |
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A burst of pink noise cycles C![]() ![]() ![]() ![]() L = Left Download/play: |
I imagine sitting in my 5-ch listening room, and bursts of pink noise emit from one loudspeaker at a time. |
Stereo flute/guitar duo |
Anechoic |
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Exactly as recorded.
Download/play: |
I am listening to an anechoic stereo signal via headphones: The sound is very clear but completely inside my head. |
Stereo flute/guitar duo |
Binaural listening simulation |
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How the anechoic stereo recording of the duo
sounds when replayed trough speakers L and R with only the natural acoustics of the listening room added. Download/play: |
I imagine sitting in my 5-ch listening room listening to stereo-speaker replay of an anechoically recorded stereo signal. I must now think that I do no longer listen via head- phones. I notice that it is more relaxing to listen and that the sound is no longer inside my head (1). |
Stereo flute/guitar duo |
Binaural listening simulation |
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How the anechoic stereo recording of the duo
sounds after a stereo remix with reverb as heard over only the left and right speakers in the listening room. The two read squares indicate placement of two virtual sound sources used for the right and left anechoic stereo signals. Note: the amount of reverb is likely to be too high for many tastes but this is a demo that attempts to clearly illustrate the principles rather than be subtle. Download/play: |
I imagine sitting in my 5-ch listening room listening to stereo-speaker replay of a stereo recording of the duo playing in a concert hall. |
Stereo flute/guitar duo |
Binaural listening simulation |
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How the anechoic stereo recording of the duo
sounds after a 5-channel upmix with reverb as heard over the five speakers in the listening room (2). With a real listening the difference from the previous example is more obvious. Also see Note on the previous example. Download/play: |
I imagine sitting in my 5-ch listening room listening to 5-speaker replay of a 5-ch recording of the duo playing in a concert hall. |
Stereo flute/guitar duo |
Binaural listening simulation |
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How only the surround channels of the 5-channel
upmix with reverb sound, as heard over the rear speakers in the listening room (3). If the stereo recording already has some reverberation,
the Download/play: |
I imagine sitting in my 5-ch
listening room listening to only the two surround speakers of a 5-ch
recording of the duo playing in a concert hall. I notice that the surrounds have an obvious "room sound" as created by the rear-facing virtual mics used in PureVerb™. |
(1) | Unfortunately the binaural simulation hasn't used your own ears (and you are - probably - not using the headphones that are equalized for) but the idea should hopefully be clear anyway. For a real test, download The FIReverb Suite 30 day trial version and try for yourself with real speakers. |
(2) | The total number of convolutions to create this sample was first 2x5 to create the 5 loudspeaker signals from the stereo duo recording and then 5x2 for a binaural listening simulation (all in all 20 convolutions performed in two steps by the MultiVolver™). |
(3) | The levels of the surround signals are not exactly as in the full 5-channel replay simulation (example 5). |