Roman Haefeli a écrit :
hi all
i'd like to create a patch, that measures the distance between the
speaker and the microphone. my first problem is, that i don't know which
kind of signal would be suitable for that purpose. the simplest is to
use a dirac impulse. but on the receiver-side it's hard to separate
unwanted artefacts from the impulse itself. also it would be nice, if it
would be possible to detect the signal reliably at different amplitudes,
since the amplitude heavily changes when moving the mic closer to and
farer from the speaker. i am looking for a method, that allows higher
precision than the usual block-size (which introduces a grid of ~0.5m @
44100Hz, which is not very accurate). also should it be possible to
detect the signal correctly, when there was reverberation added from a
room. i know, there are ultrasonic-bases devices to measure a distance
to a wall, but i don't have clue how they work, but it makes me hope,
that something similar is possible with pd. any hints are much
appreciated.
roman
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hello,
you could use the patch you've made last month for am-radio and use it
to measure latency...
[message bang(
|
[t b b]
| |
[modulator] |
| |
[am-radio] |
| |
[dac~] |
|
[adc~ 1] |
| |
[demodulator] |
| |
[route message] |
| |
[timer ]
|
[nbx]
obviously the message is translated into voltage levels by a modulator
and a demodulator.
In the equation, you will need to substract the latency of the soundcard.
hope you get what I mean, and find something in this way,
best,
patco.
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