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Any low-end camcorders I could buy for BATS' sounds?

We want to do a project taping a bunch of environments with sounds just at or above the audible range... sort of a hearing test with psychology mixed in. Most mikes pick up just above the 20kHz range (which is at the high end for audio for most young kids), but a friend told me that most camcorders on the market use a Pulse Code Modulation of around 8bits ...a sampling rate that puts them down around 8kHz. I'm not sure I understand. But I'm seeing in camera specs an audio sampling rate of 16bits.... which still puts us below where we'd like to go with this. Is my friend wrong, or do I have to scrap this experiment?

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Re: Any low-end camcorders I could buy for BATS' sounds?

In reply to: Any low-end camcorders I could buy for BATS' sounds?

In this case, the bit count is almost irrelevant. Here's why. To sample a 20KHz sound the sampler needs to run at 40KHz or higher. The bit count is more about the quality and depth of the sound, but not the possible frequency range.

You'll be out of running for most consumer camcorders and my have to get some ultrasonic recorders. If your school has an electronics division, take time to visit their gurus on such.

Bob

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Re: Any low-end camcorders I could buy for BATS' sounds?

In reply to: Re: Any low-end camcorders I could buy for BATS' sounds?

Thanks, Bob.
I take it that the same constraints apply even if I record in analog, and convert to digital... i.e. the same sampling algorithms are going to be applied during the conversion, right? The ultrasound should get through the CODEC compression, but we'd have to run it through the same camera to get it there, right? I'll talk to the guys in EE. This might not be extremely do-able yet.
Spark

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Re: Any low-end camcorders I could buy for BATS' sounds?

In reply to: Re: Any low-end camcorders I could buy for BATS' sounds?

In short, yes. I think you're beginning to grasp the problem and will do fine.

Look up AUDACITY to see if you can edit the recording into more human audible content.

Bob

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