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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Real vs Reproduced posted by Inmate51 on August 20, 2014 at 20:12:34:
The answer is incredibly easy - take a very simple case, A single Cello playing in a room for you. (My Niece was just in a recital this past weekend.) The sounds produced by the cello emanate form all over instrument - the front, the back, the bridge, & strings, of course.
The acoustics radiate outward into the room - are reflected by the various surfaces and combine in a completely non phase coherent way at your ears. Then the fun stuff happens. Your ears convert the waveform into a arbitrarily sampled god-zillion different neural impulses - that combined with visual clues - assuming your eyes are open - that the brain processes into an event that moves us with the emotion in the music and the real time experience of the performance.
In stereo (or multi-channel) reproduction the waveforms from pressure variations in the room are recorded mostly with directional microphones (omni's would be better perhaps - another discussion) at discrete positions in the room. In the production - those signals are blended into the two or more signals making up the recording. Heyser called this process "Apodization" - literally "Removing the Foot" - or foundation of the live event.
In playback, we take those two somewhat correlated voltage signals, amplify them without too much alteration, directed then to some kind of loudspeaker that further distorts the signal - in space, time and frequency. By the time it begins producing its pressure variations into a room with a completely different characterization (visually and acoustically), there is absolutely very little resemblance to any of the recorded tracks - let alone the waveform of pressure variations that occurred at your ears.
We sit in out listening chair - perhaps to a Klipschorn or WATT or Quad, or 35 year old twice re-coned Advent - and our brain works the magic, trying, and often succeeding to fool us into imagining a live performance.
It is a miracle it works at all...
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
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Follow Ups
- RE: Real vs Reproduced - BigguyinATL 07:22:41 08/21/14 (12)
- At least with time coherent speakers - morricab 03:49:17 08/22/14 (2)
- RE: Recording technique - microphones and playback systems - Trying to maintain a waveform fidelity. - BigguyinATL 13:54:55 08/22/14 (1)
- RE: Recording technique - microphones and playback systems - Trying to maintain a waveform fidelity. - morricab 07:19:58 08/23/14 (0)
- Real vs Reproduced / reality is REAL COMPLICATED - PSP 09:42:33 08/21/14 (2)
- RE: Real vs Reproduced / reality is REAL COMPLICATED - Inmate51 12:41:17 08/21/14 (0)
- yes, but interestingly... - BigguyinATL 11:40:06 08/21/14 (0)
- RE: Real vs Reproduced - Inmate51 08:55:04 08/21/14 (1)
- RE: Real vs Reproduced - BigguyinATL 09:20:01 08/21/14 (0)
- our brain works the magic, trying, and often succeeding to fool us into imagining a live performance - G Squared 07:58:42 08/21/14 (2)
- RE: I nice little read - if you are interested. - BigguyinATL 09:58:15 08/21/14 (1)
- RE: I nice little read - if you are interested. - Inmate51 07:31:03 08/22/14 (0)
- Nice. Thanks for posting! - woober goober 07:29:30 08/21/14 (0)
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