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Re: High-frequency hearing in humans
On Thu, Feb 3, 2011 at 23:08, Kevin Austin <kevin.austin@xxxxxxxxxxxx> wrote:
> A colleague of mine has been working on clicks in an electroacoustics aural perception course. He discovered that a 48kHz sampling rate was "too crude", and that working at 96kHz (or higher), the differences between clicks over 8kHz were noticeable. This is not quite what sampling theory seems to say. At 44.1kHz, a single sample click represents 22kHz, and a two sample click represents 11kHz. How does one represent a 16kHz click with a 44.1kHz sampling rate?
I think one has to be careful about the actual D/A hardware in these
cases. Oversampled sigma/delta? R-2R? What are the postfilter
characteristics? I think with these type of stimuli, differences
might be audible: even if the same soundcard is used at different
rates, the filter should change. The differences in filter
characteristics might extend to lower frequencies, where they might be
picked up by individuals with good hearing.
Joachim Thiemann :: http://www.tsp.ece.mcgill.ca/~jthiem