1 . Introduction
What is Audio all about? Subjectively, the answer is easy. It is literally a question about good sound. In practice the human mind can tell, within seconds, if a sound picture is correct or not, just as quickly as it can tell whether a girl is beautiful or a house, a car or a landscape is impressive.
Human beings consider things in a "global" fashion - everything is registered and perceived simultaneously, but no details are clear to begin with. However, when we measure, we do exactly the opposite ?we describe details with extreme accuracy. We concentrate on one parameter at a time in a "local" fashion.
We could accurately measure how tall the girl is, what colour her hair is and so on, but that doesn't directly tell us how beautiful she is.
Likewise, on a Hi-Fi system we could, for instance measure frequency response and harmonic distortion, but neither does that tell us whether the system is good or bad.,
Things that are easily and intuitively perceived, like Audio, are generally extremely hard to explain. It requires many words, many measurements, foreknowledge and interpretations.
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