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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: How low is too low posted by morricab on June 15, 2006 at 08:18:12:
to determine the most conservative audibility level - ie lowest audibility of distortion. I would "manufacture" a continuously sweeping sines wave signal at a very low level and mix that with samples of music signals and a set of the same music samples with no swept signal. Then have a set of samples with a slightly higher swept sine signal. Using ABX, play the sample sets until a bias in the results is created.Since distortion components cannot be predicted, and the sine wave signal will at some time will be mostly at a frequency that is arbitrary relative to the music signal. At the point you can no longer discriminate the swept signat you can be pretty certain you could not perceive a disortion component at the same level.
Probably a great wav to use my goldwave program.
Play back equipment would have to have a low distortion capacity itself, or the swept modulation would be creating distortion in the equipment.
Since the music signal has a varying level, reporting the relative level of the distortion signal is a bit problematic in this case. Choices would include relative to the max level, or min level or average level or a statistical median or minumum - Something like the sound the music signal is above 90% of the time.
I'll keep you posted.
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- Here's what I would do... - gymwear5@hotmail.com 14:21:23 06/16/06 (0)