W
William
- Jan 1, 1970
- 0
Anybody can tell me how to do the sound level power of ultrasonic sound in db?
Plese help!!!!
Plese help!!!!
Anybody can tell me how to do the sound level power of ultrasonic sound =
in db?
Plese help!!!!
What about if we want to make ordinary sound level measurement,
i.e. in the normal hearing range, do we do it as follows:
We can use an electret microphone connected to an op amp
amplifier, and then we can read the output of the op amp.
I assume the voltage is directly and linearly proportional
to the sound level, so all we need is to measure two
known sounds, we can use an already calibrated sound meter
for this. Then we draw a line between the points and we can
know which voltage corresponed to which sound level.
The only problem here is that we have skipped the frequency
weighting, so we must (if at all possible) choose a frequency
for the calibration which is not affected much by the weighting
curve in the real sound meter (I don't know if such a frequecy
exists) and, of course, then, our meter will be good only for
that frequency.
Is this correct?
Addie.
aaa said:What about if we want to make ordinary sound level measurement,
i.e. in the normal hearing range, do we do it as follows:
We can use an electret microphone connected to an op amp
amplifier, and then we can read the output of the op amp.
I assume the voltage is directly and linearly proportional
to the sound level, so all we need is to measure two
known sounds, we can use an already calibrated sound meter
for this. Then we draw a line between the points and we can
know which voltage corresponed to which sound level.
The only problem here is that we have skipped the frequency
weighting, so we must (if at all possible) choose a frequency
for the calibration which is not affected much by the weighting
curve in the real sound meter (I don't know if such a frequecy
exists) and, of course, then, our meter will be good only for
that frequency.
Is this correct?
Addie.