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In the Forum: Audio Discussions
In the Thread: Measuring reality: empirical mode decomposition
Post Subject: Distortion and sound qualitiesPosted by drdna on: 2/8/2009
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 Andy Simpson wrote:
This type of test is more commonly called DFD (difference frequency distortion) and is sometimes used in microphone measurement to measure acoustic/mechanical non-linearity.
This is interesting. What physical methods are employed to minimize the distortion?

 Andy Simpson wrote:
If anybody is interested in listening, I am interested in perception of differences - dynamics, clarity, TUNING (ie. audible presence of inharmonic products), etc.
Well I listened to these files. There was an obvious difference. It did not seem to be blinded: the "A" files seem to have more distortion. I perceived the distortion as a loss of some of the correct sound which was then made into noise. The analogy: taking a fine wood carving, sanding it lightly and sprinkling the surface with the resulting sawdust. The noise floor and hence clarity and dynamics suffer, as well as correct timbre of sound.

In general, my impressions of distortion are:

harmonic distortion: usually too slight to be heard
intermodulation distortion: affects timbre, focus, presence
frequency response: affects "connection", emotional color

SO far...

Adrian

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