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Posted by Davide L. on January 22, 2008, 9:24 am
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Hello everybody,
I am using the epuck robot for my project and I am really interested in
using sound. The epuck is equipped with 3 microphones and a speaker.
After some testing with tones in the range of 100hz to 1Kz I found out
that the microphones work well only if the source of the sound/noise is
very very close to them (and strangely they can hear better a clicking
of fingers). I was wondering whether someone had any experience with
sound and microphones. I was planning to change them for better ones
(even if a lot more expensive) but I have no idea of what kind I should
look for and if that is the real problem anyway.
At the moment they are SISONIC SP0103NC3-2 (used for mobile phones I think).
Any suggestion, advice, critic .... very welcome.
Thanks.
Davide.
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Posted by GregS on January 22, 2008, 9:51 am
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>Hello everybody,
>
>I am using the epuck robot for my project and I am really interested in
>using sound. The epuck is equipped with 3 microphones and a speaker.
>After some testing with tones in the range of 100hz to 1Kz I found out
>that the microphones work well only if the source of the sound/noise is
>very very close to them (and strangely they can hear better a clicking
>of fingers). I was wondering whether someone had any experience with
>sound and microphones. I was planning to change them for better ones
>(even if a lot more expensive) but I have no idea of what kind I should
>look for and if that is the real problem anyway.
>
>At the moment they are SISONIC SP0103NC3-2 (used for mobile phones I think).
>
>Any suggestion, advice, critic .... very welcome.
>
>Thanks.
>
>Davide.
Threse are not raw capsules, but already have 20 dB gain or X10 voltage.
So yo need more gain. Probably another X10. Electret capsules usually have plenty
of frequency range. You need another amplifier after the capsule. Capsule noise
will go up but should be OK.
greg
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Posted by Brendan Gillatt on January 22, 2008, 5:51 pm
Please log in for more thread options -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Davide L. wrote:
| Hello everybody,
|
| I am using the epuck robot for my project and I am really interested in
| using sound. The epuck is equipped with 3 microphones and a speaker.
| After some testing with tones in the range of 100hz to 1Kz I found out
| that the microphones work well only if the source of the sound/noise is
| very very close to them (and strangely they can hear better a clicking
| of fingers). I was wondering whether someone had any experience with
| sound and microphones. I was planning to change them for better ones
| (even if a lot more expensive) but I have no idea of what kind I should
| look for and if that is the real problem anyway.
|
| At the moment they are SISONIC SP0103NC3-2 (used for mobile phones I
| think).
|
| Any suggestion, advice, critic .... very welcome.
|
| Thanks.
|
| Davide.
You could try a simple compressor circuit - it's used in audio to boost
the volume of quiet sounds and attenuate loud ones.
http://machines.hyperreal.org/categories/DIY/info/compressor is a nice
circuit.
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j2sw6eNY1ZtP6huzDn7/Pbk=
=6tGe
-----END PGP SIGNATURE-----
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Posted by Brendan Gillatt on January 23, 2008, 5:00 pm
Please log in for more thread options broker system," and the facts as
presented below will speak for themselves as to whether the
objurgations are warranted or not. The brokers are all China men,
and are admitted to be men of the worst character. They have their
assistants or partners in the chief ports of China, who scout
the country round in search of men and are known to be not very
particular as to the means they employ in obtaining them. Nothing
is required of the recruit except a willingness to hand himself
over with his scanty outfit to the tender mercies of the broker,
who pays his passage and provides him with food and such things as
he considers needful. While the vessels, however, with their decks
crowded with emigrants, are leaving the Chinese ports, it is a
common occurrence for the cry of "man overboard" to be raised, so
common indeed that few Captains now take the trouble to stop their
ships, leaving the fugitive coolie to his fate or to be picked up
by one of the native craft which are usually close at hand. The
|
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Posted by Brendan Gillatt on January 23, 2008, 6:28 pm
Please log in for more thread options deposed to in Court; the Chinese and Dr. Eitel have
spoken from the favorable surroundings of respectable domestic
life in China. The conflicting views thus presented are but a
reproduction of conflicting testimony in reference to negro
slavery in the West Indies, and more lately in the United States.
Very benevolent persons, some my own friends, looking at facts
from the respectable standpoint, thought that such slavery was
based on human nature, and conduced to the spread of Christianity.
But the contrary view prevailed. I am quite satisfied that the
right view on this question will ultimately prevail. As a man I
have very decided views on these subjects, but as a judge I feel
it is not for me further to debate them. I expressly retired from
doing so on the 27th of October, 1879, although I thought it
necessary in March last to comment on what I thought to be an
erroneous view of the _patria potestas_."
Later, in response to a suggestion on the part of the Governor, for a
more explicit statement as to wherein his views differ from those of
the Chinese and of Dr. Eitel, the Chief Justice says, among other
things:
"I do not admit the statements of Dr. Eitel. They do not apply
to Hong Kong, but they may, and probably do, apply to certain
respectable classes in China proper, where China family life
proper exists. What I assert is that family life does not, in the
proper Chinese sense, exist in Hong Kong, and that although, under
certain very restricted conditions, the buying and selling, and
adopting and taking as concubines, boys and girls in China proper,
is permitted as exceptions to the penalties inf
|
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>
>I am using the epuck robot for my project and I am really interested in
>using sound. The epuck is equipped with 3 microphones and a speaker.
>After some testing with tones in the range of 100hz to 1Kz I found out
>that the microphones work well only if the source of the sound/noise is
>very very close to them (and strangely they can hear better a clicking
>of fingers). I was wondering whether someone had any experience with
>sound and microphones. I was planning to change them for better ones
>(even if a lot more expensive) but I have no idea of what kind I should
>look for and if that is the real problem anyway.
>
>At the moment they are SISONIC SP0103NC3-2 (used for mobile phones I think).
>
>Any suggestion, advice, critic .... very welcome.
>
>Thanks.
>
>Davide.