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The sine vs. saw tooth wave is an excellent test.

Posted by jsm (A) on January 25, 2006 at 15:40:23

In Reply to: I hear you :-) posted by Christine Tham on January 24, 2006 at 16:27:01:

It avoids any question of phase shifts. However, when I listen to tones at the limit of my hearing, I have a hard time distinguishing any characteristics of them other than that they are there.

I don't what kind of filters the XA777ES has. I am probably older than you, and I doubt I have much hearing above 12-13 kHz. I should go back and repeat the test. I can slide the low-pass frequency around, and it would be interesting to see where I hear an effect. I know I can hear a drop of 2-3 dB on my 32 band equalizer at 10kHz.

As for the difference between 96 and 48 kHz, if you are talking about sampling frequencies I think something else could be going on. That is over-sampling issue. Regardless of the famous Nyquist result, there is no question from my experience that things are better when you have more than a factor of two oversampling. For example, with 48 kHz sampling, a sine wave of 24 kHz could be sampled in such a way that no signal is detected. So how much oversampling is needed before you can't hear the difference with more? People argue about this and do tests, but there is nothing really definitive. I don't know the answer, but I suspect 4-5 times oversampling (I mean real oversampling of the original signal at the highest frequencies of interest) is plenty, and perhaps even 3 is enough. My research makes use of CCD images. Pixels are a very expensive commodity in our custom-built detectors, so we do not like to oversample needlessly. At first I designed my instruments to work at two time oversampling, but experience taught us we could get more out of our data if we used three to four times oversampling, and that's what I designed my later spectrographs for.

Joe

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