SD wrote:
On 3/22/2006 8:22 PM, wrote:
[snip]
The favorite demonstration used to illustrate the extended frequency range
of SACD is to display what happens to a 10kHz square wave when it is
recorded on CD and SACD and then played back. The illustration consists of
four oscilloscope shots and displays how SACD produces a very close
approximation to the original square wave while the corresponding result for
CD is a considerably rounded waveform which is closer to a sine wave than a
square one. The pictures are very convincing and will probably spook quite a
number of CD owners. They are accompanied by a brief description which tells
how CD loses harmonics of the test wave from the third up and so is clearly
inferior to SACD. What is forgotten is that the second harmonic of a 10kHz
periodic waveform (which CD can handle) is at 20kHz, already at the upper
limit of hearing for adolescents. The third harmonic would be at 30kHz and
there is little evidence that people are able to hear that high under any
reasonable conditions-it's ultrasound. So is the demonstration meant for you
or for your dog?
Square wave? Do any natural sounds have square waves? Isn't that what
blows speakers?
Clarinets produce square*ish* waves.
___
-S
"Excuse me? What solid proof do you have that I'm insane?" - soundhaspriority