Hello.
I'll appreciate your help in assessing the info on the commonly
accepted bandwidth in audio recordings by pocket-type consumer digital
still cameras.
I'm undertaking certain project of processing audio data recorded by a
consumer digital still camera. This is going to be quite
computation-intensive, and I'd strive to obtain a working algorithm
that would be realizable in real time.
The audio is recorded by the camera being in video clip recording mode
(AVI clips), and the camera hardware is configured for a standard
CD-quality sampling rate of 44.1kHz. My assessement calls for a fair
(IMHO) assumption that such CD-quality sampling rate is non-necesserily
high given the particular market the products targets. I think it can
be safely assumed that the main goal of audio recording by a
pocket-type consumer digital still camera (in AVI clip recording)
doesn't encompass high qualily audio (such as concerts and alike), but
rather voice and surrounding sounds.
Given that assumption, I'm willing to downrate the recorded data and
built two sampling rate conversion models - one for twice reducing
(i.e. decimating to 22050 Hz sampling rate), the second for 16 kHz
sampling rate.

Do you know any commonly accepted rules of thumb of an acceptable audio
bandwidth for such kind of applications (low-end and mid-end
pocket-type consumer digital still cameras) ? 
That would dictate the minimum sampling rate.

Thanks in advance, Alex