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author | Travis Howell | 2006-01-20 00:19:56 +0000 |
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committer | Travis Howell | 2006-01-20 00:19:56 +0000 |
commit | bb9a3814dc216290b35a5ef98e3178cca226f6f4 (patch) | |
tree | 7a830abc4f96217edd05be5da2c400104676f948 /doc/07_08.tex | |
parent | 89ecf72e517571753788590893f53d389699a140 (diff) | |
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Sync. updates and section numbers.
svn-id: r20104
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diff --git a/doc/07_08.tex b/doc/07_08.tex new file mode 100644 index 0000000000..31c95e00ca --- /dev/null +++ b/doc/07_08.tex @@ -0,0 +1,32 @@ +%%% Local Variables: +%%% mode: latex +%%% TeX-master: "readme" +%%% End: + +\subsection{Output sample rate} + +The output sample rate tells ScummVM how many sound samples to play per channel +per second. There is much that could be said on this subject, but most of it +would be irrelevant here. The short version is that for most games 22050 Hz is +fine, but in some cases 44100 Hz is preferable. On extremely low-end systems +you may want to use 11025 Hz, but it's unlikely that you have to worry about +that. + +To elaborate, most of the sounds ScummVM has to play were sampled at either +22050 Hz or 11025 Hz. Using a higher sample rate will not magically improve the +quality of these sounds. Hence, 22050 Hz is fine. + +Some games use CD audio. If you use compressed files for this, they are +probably sampled at 44100 Hz, so for these games that may be a better choice of +sample rate. + +When using the Adlib, FM Towns, PC Speaker or IBM PCjr music drivers, ScummVM +is responsible for generating the samples. Usually 22050 Hz will be plenty for +these, but there is at least one piece of Adlib music in Beneath a Steel Sky +that will sound a lot better at 44100 Hz. + +Using frequencies in between is not recommended. For one thing, your sound card +may not support it. In theory, ScummVM should fall back on a sensible frequency +in that case, but don't count on it. More importantly, ScummVM has to resample +all sounds to its output frequency. This is much easier to do well if the +output frequency is a multiple of the original frequency. |