Hi Gus,
Yes, to record a signal frequency of 100 kHz, one would need a sample rate =
of lets say at least 220 kHz (205 kHz would be probably still too low). The=
actually required minimum sample rate would depend on the properties of th=
e anti-aliasing filters of the specific recorder and the intensity of the p=
otential signal components above 100 kHz.
Some time ago I tested the aliasing behaviour of the SD 722 recorder (at a =
sample rate of 192 kHz) by recording a sine sweep signal ranging from 5 to =
130 kHz through its line input:
http://www.avisoft.com/scartch/alias_722.gif
It can be seen that its anti-aliasing filter is not very steep at all, whic=
h means that a small signal that appears in the recorded .wav file for inst=
ance at 70 kHz might actually be a 122 kHz signal (96-70+96=3D122).
Bye the way, I enjoyed the stereo sample of your work very much.
Raimund
--- In "gus" <> wrote:
>
> Hi Raimund -
> i think I know what you mean but Im not sure - what you are basically say=
ing is that if say you wanted to record a frequency of ,say, 100khz you wou=
ldnt just need a recorder that stated its max sample rate was 200khz but ac=
tually 205 khz or something like that (ie a little bit over) ?
> Gus
|
