I'll toss in a couple un-informed opinions...
It's probably a typical electret button mic,
you may be able to ferret the part number from
schematics (or ask the mfg directly). If so it's
likely something like 30-10Khz freq response.
So then, yes you should be able to 'record' sound
in the human range, but see my comments from yesterday
about bandwidths and sampling rates.
The actual conversion values are probably pretty
arbitrary, depending on the gain of the pre-amp
for the mic. Ideally the max sound level you want
to capture should produce the max ADC value...and
when properly sign-converted, the min as well...
it's just the instantaneous voltage of the waveform
you're sampling.
MS
cya wrote:
Hi everyone,
I have modified the oscilloscope program to sense the sound readings
from the microphone of MTS310.
Then, the java program of oscilloscope can plot the figure of the sensed
readings.
But, I have some questions about the usages of the microphone.
Questions:
1. I have seen that acoustic recording is one of the principal uses of
the microphone circuit in the manual.
Does it mean that i can record the sound entirely if the sampling rate
is enough? Or, the microphone could only sense the 4KHz tone.
2. I get the readings from the microphone, but i don't know what the
unit of the readings is.
What is the meaning of the values? Could the values convert to other
engineering unit?
I have searched tinyos-help for the answer, but i can't exactly understand.
If someone has tried this, please tell me the answer.
Thanks in advance.
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