Paul Mullen wrote:
Hi Guys,
I've been lurking here since the beginning and have very little experience
with video technology but I have experience with high end audio hardware.
The kind of people who care that much about making it sound "warm" and "full"
already have spent €5k on a microphone and another €3k on a preamp for it. If
you can create a sound card that can accurately digitise that then you would
be on to a winner.
A multi input/multi output system with high end A/D converters that sample at
24bit/192kHz is state of the art atm and I can't see anyone needing much more
in the pro/semipro audio world. The audiophiles who say they tell the
difference between a song at 96kHz and one at 192kHz because of the ripple
effect from the filter have a completely different set of requirements. They
just want the highest numbers possible on the box.
It isn't the ripple effect from the filter. Only dogs can hear that.
What you can hear below 20 KHz is the phase linearity of the filter.
The frequency response up to 200 KHz has an effect on the phase
linearity of the filter below 20 KHz. Nyquist sampling theory is
correct -- no useful information is obtained by sampling at higher than
48 KSPS (the standard 44.1 KSPS is really sufficient). So, why do sound
users believe this? Simple, a higher sample frequency means a higher
filter frequency which pushes it closer to 200 KHz. But a proper Bessel
filter will get you the same thing.
The studio market is pretty big and has fairly deep pockets for something
useful, so I can't see you having trouble selling it if you get it reviewed
by the right people.
But as you have already pointed out, these users are not real engineers
and they have developed superstitions about what is needed for good
sound reproduction.
One concern is that you will need to build a breakout box for your A/D
converters or else rely on someone else's converter box and just support
something like ADAT lightpipe I/O but at that stage you have pushed yourself
downmarket unless you add something to differentiate yourself like a DSP
farm.
It is the DAC output stage which is most important for sound quality.
So, if you want to make a better product, you need to include that part
of the system. OTOH, ADC just requires a low noise driver amp/SaH and a
good ADC -- no magic there (well actually there is a little since a good
Sample and Hold needs to be high impedance and low noise needs low
impedance).
--
JRT
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