Amazing... Stephen... I really don't know much about this... I mean I
don't know theactually "audio physics" between bits and sampling
rates. Of course sample rates seems obvious... how often the recorder
is "trapping" for sound, but how that relates to 'bits" is
mysterious... anyway... just going with what you said:
on recordSound
set the recordsamplesize to 11
set the recordrate to 5
set the recordformat to "wave"
record sound file gAudioTestPath
end recordSound
I'm getting really decent quality at about 15 K per second or 900 K
per minute
i.e. 11 seconds gives us a 168 K file... I don't think it gets any
better than that! And you seem to have declared the bottom
threshold... as anything less than a sample rate of 11 starts to
break down noticeably... I guess everyone has figured this out long
ago...
Sivakatirswami
On May 15, 2006, at 6:10 AM, Stephen Barncard wrote:
Actually you could halve that sample rate to 11 K and still have
good intelligibility. Using the Nyquest theorem, the highest
frequency you can record at a given sample rate is approximately
less than half its sample rate. AM broadcast stations cut off at
5khz, which can be handled easily by the 11k sample rate.
This is not 11 k bits per second, like in MP3s, but a full parallel
16 bits at 11k and without compression, will have no artifacts,
just bandwidth reduction - i.e. less high end.
sqb
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