25 Aug
2006
25 Aug
'06
7:55 p.m.
st wrote:
BJaY wrote:
Common misconception... Very high frequency audio does not equal
electromagnetic radiation (radio, etc.). Audio is the compression and
expansion of air, so it isn't really affected by EMI.
Are you using another ultrasonic transducer to receive the signal? Is
it necessary to capture the entire waveform, or just the envelope? If
you need an accurate waveform, your best bet would likely be to build
your own A/D circuit. Otherwise, rectify it, use an LP filter, and
you're good to go.
TimH
Hi,
I'm looking to do some high sample rate stuff - 500kHz or more
Where did you get a microphone and preamp that would respond at
that frequency? You will be up into maritime radio communication
band, approaching AM radio band. I wonder if you will have problems
with interference.