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In Reply to: Re: see hi-fi world page 55 march 2000 rre bandwidth of music posted by Steve Eddy on February 14, 2000 at 11:25:35:
just saw in another mag that the chief engineer of tannoy says that
cymbals go up to 100khz. when we get the 192khz stuff in place does
that mean the 50 v/us goes away and we trade up?i seem to remember some old articles that says marantz japan has
tried sampling rates up to 500khz and in each case sound quality
improvement was audible. is this where we are headed after the 192khz?of course by that time i will need hearing aids to get it--hmmmmm-- do
they make some lightweight single ended tubed triodes with bone
conduction------leelock
The microphones will have to improve if we want to get 100K response, except
for special, very noisy, instrumentation mikes. The standard is about 40KHz for the best practical mikes today, and has been for the last 30 years.
it is true the popular and mainly colored(musical?) mics in wide use
do not go up in response as the capsule needs to be small and the
electronics very quiet(expensive?). there is also no choice in polar
patterns--only omni for the really high end specs.however earthworks(founded by ex-dbx guys) makes instrument and
music mics with outstanding characteristics. their instrument mic
is omni pattern and get out to 55khz at -3db and with self noise of
26dba with max spl of 150db. the low end is something like 5hz at
-3db.i guess this is a chicken and egg thing where there was no demand for
the response possible with the likes of the earthworks (i think the
small diameter b&k mics also went up to very high khz) since the
domestic playback systems could not take it. but just like the super
tweeters now coming out in japan with 100khz response i think the
industry will respond with 50khz and higher mics once sacd and dvd-a
starts hitting the market in volume. imagine a digital mic with smarts
to average the noise out and microfabrication in silicon....
leelock
Thanks for the input. I have not followed this manufacturer, but I have helped design mikes over the decades and know the tradeoffs. This is the problem: It requires a small area diaphragm to have a high resonant frequency and to have a flat response at high frequencies. The electronics has to handle VERY high Z and still be very quiet. This is a difficult tradeoff, added to the fact that small diaphragms have low output as well. B&K made very small instrumentation mikes, but they were very noisy and could only be used in very high ambient environments or measurement purposes.
Cymbals may, indeed, have harmonics out to 100kHz. That is pretty much meaningless, though, since 16/44 digital systems prevent any signal past 22kHz.Trevor
Trevor Wilson wrote:"Cymbals may, indeed, have harmonics out to 100kHz. That is pretty much meaningless, though, since 16/44 digital systems prevent any signal past 22kHz."
Yes. But what got this sub-thread started was commentary on the new digital audio formats and their extended bandwidths as it relates to slew rate.
se
CD's, I don't listen to no stinking CD's! ;-)
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