[maemo-developers] [maemo-developers] microphone recording quality

From: Michael Wiktowy michael.wiktowy at gmail.com
Date: Thu Oct 12 23:07:05 EEST 2006
On 10/5/06, Andrew Barr <andrew.james.barr at gmail.com> wrote:
> Hi, I notice that apps recording from the microphone input--Maemo
> Recorder in my case--are limited to a sampling rate of 8,000 Hz (I
> looked in ~/.gstreamer-0.8/registry.arm.xml (or whatever) to determine
> this). This is okay if there is little to no background noise (I am
> recording class lectures), but if there are papers shuffling or excess
> talking the main voice can get very hard to follow. Is it possible to
> increase the sample rate, say, to 22,050 Hz, where the GNOME Sound
> Recorder is set for "voice" quality? This works quite well but
> unfortunately requires my Thinkpad to be fired up :(. What's more, my
> Thinkpad doesn't have the battery life of the Nokia, especially with
> WLAN on. I have a 1 GB memory card so space is not really a concern
> (typical .wav files from one session with g-s-r on my laptop are ~230
> MB).
> Regards,
> Andrew Barr

I would like to second this request. I am not sure if the 770 has enough
poop to handle that much more data but if it does then I would love to have
the option to handle CD quality wavs.

One issue might be if the mic on the 770 has some hardware prefiltering on
it. I get the sense that it does based on the samples that I have taken so
far and that might limit the frequency content entering the 770 in the first
place. So no amount of sample rate increase will capture something that
doesn't exist.

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