microphones for robot

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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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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-----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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32)
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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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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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