[opendtv] Re: Cinema explained by persistence of vision : a myth
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 21 Jun 2010 19:26:18 -0500
Olivier Houot wrote:
>> But if the hand moves faster than a watch's second hand, it seems
>> to require higher update rates to achieve a smooth-looking
>> display. Sometimes as high as 32 or 64 Hz, depending on the
>> instrument.
> I don't see how you can deduce this from a purely thought
> experiment? Perhaps you actually saw the phenomenon?
Yes, indeed, and have to design for it too.
Same sort of odd effects occur in audio, where frequency response and playback
power peaks in some cases are way more than traditional Fourier analysis would
predict. For example, to reproduce piano correctly. Or most percussion
instruments.
The piano's highest note, believe it or not, is only slightly more than 4000
Hz. (Most instruments are far less than that.) And yet, most audio buffs will
tell you that pianos never sound right, even in the best audio systems. Also
interestingly, the only other musical instrument that has higher fundamentals
than the piano is the pipe organ, out to 8 KHz.
The brain is great at detecting missing overtones, even well beyond the
supposed 20 KHz limit of hearing. So, strict Fourier analysis is not quite
enough.
http://www.psbspeakers.com/audio-topics/The-Frequencies-of-Music
http://www.cco.caltech.edu/~boyk/spectra/spectra.htm
Bert
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
