A couple of points:
- at the recording level adjustments are usually made to what has been recorded to change the levels of certain aspects of the sound in order to make it "more realistic" sounding for the final cut
- Our audio systems are not linear from one end to the other which needs to be recognised so as not to constantly repeat this myth of linearity
- finally, we need to understand what is important to our auditory perception & focus on these important aspects rather than the blunderbust approach that currently prevails. This means that we are more than likely wasting our time trying to linearise certain aspects of the audio signal & not spending enough effort in addressing other areas of the signal.
Of course I know that a recording is not an objective reproduction of an audio event; that 'artistic' decisions have been made even if the recording is just a pair of mics recorded directly without any further processing. So let's think of all recordings as the audio equivalent of the Mona Lisa and that we can't get to the gallery to view the painting directly. The question remains: how do I want to view (the reproduction of) the painting?
I don't accept the point about audio systems not being linear from one end to the other. Of course, in practice, they're not literally linear - there are distortions - but there's no reason for a system not to be very close:
- good mics are close to linear;
- digital audio is linear to any arbitrary degree we choose, by definition;
- a solid state amp is linear to all intents and purposes;
- a good speaker transducer is close to linear especially if not driven beyond its limits (so it pays to be clever in how we use them).
A recording engineer can choose to feed a pair of mics directly into ADCs and into digital storage. We play the recording directly over a pair of DACs and into our amplifiers and speakers. It's a close-to-linear system if we choose it to be.
Would I rather view the Mona Lisa (or a photograph of the Mona Lisa) over a 2" phone screen, a 15" laptop monitor, a 26" CRT, or life size on a 100" screen with the capability to go very bright? I would say it should be obvious, but I'm not sure everyone makes that choice in audio terms. For a while, I believed that CRTs were inherently superior to LCDs, and went out of my way to keep on using a CRT TV while all around me, everyone changed to LCD. I wouldn't make that choice now.
For my audio system, I want the 100" screen with as high a pixel density as possible - so it can still display a dim 2" image if that is what the person who made the image wants me to see, but can also do a huge painting life size. If I choose to limit myself to less than the 100" screen, or it is imposed on me by necessity, do I want to process the image in the hope of making it closer to the experience of viewing the real painting? I would suggest that on the 2" screen, it would pay to zoom in on the Mona Lisa's face and optimise the contrast, gamma and saturation for a not-very-bright display, and on the 26" CRT we might want to do something similar but different. Maybe we employ an automatic algorithm that zooms and pans over the image slowly. Maybe the subjective experience is 'improved' - and maybe the effect, for some people, is even more intense than viewing the original painting. But in describing the system, shouldn't we really point out that it's a small, dim screen and an algorithm, rather than describing the (spurious?) emotional effect that the processed, cropped Mona Lisa has on us?
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