use-revolution Digest, Vol 24, Issue 59

[Jeffrey Reynolds]

Jacqueline,

if its just voice narration 11K 8bit might be ok. if you narration has 
any music underscore its tough to go below 22k with underscore, 
especially with 8bit sampling, you will really notice the sound quality 
of the voice narration go way down. you might try some tests with your 
files and see how they sound.

for the kids books we do the narration files at 22k 16bit uncompressed 
wav files. since we have plenty of room on the CD-ROM its worth the 
extra sampling. going from 22 to 44k you notice hardly any change in 
voice only narration, but going from 8bit to 16bit makes many narration 
voices sound a bit crisper and less cracklie, so we determined it was 
worth doubling the file size by increasing the sample size rather than 
the rate. now that we are using quicktime we could compress them with 
mp3 and save a lot of room, but not sure if it is worth the trouble.

cheers,

Jeffrey Reynolds


On Sep 25, 2005, at 1:00 PM, use-revolution-request at lists.runrev.com 
wrote:

>
>>> Will 11k and 22k 8 bit AIFFs or WAVs play in Rev without quicktime?
>>
>> Probably if they aren't compressed. But I was afraid that cutting the
>> bit rate would compromise the sound quality.
>
> 11k is pretty low; anything under that is usually reserved for 
> voice-only
> situations since voice audio is usually more forgiving than music. 11k 
> is
> workable for short sound effects, but 22k is better and pretty common 
> for
> music.  If, as you say, you don't have any filesize restrictions, you 
> might
> want to consider 44k which is closer to CD quality.  This means larger 
> files
> of course, so you should probably test to make sure Rev doesn't bog 
> down
> playing back your audio (if you're loading external audio, there might 
> be a
> small delay when loading a large file for playback).