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33 lines
1.5 KiB
TeX
33 lines
1.5 KiB
TeX
%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "readme"
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\subsection{Output sample rate}
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The output sample rate tells ScummVM how many sound samples to play per channel
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per second. There is much that could be said on this subject, but most of it
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would be irrelevant here. The short version is that for most games 22050 Hz is
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fine, but in some cases 44100 Hz is preferable. On extremely low-end systems
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you may want to use 11025 Hz, but it's unlikely that you have to worry about
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that.
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To elaborate, most of the sounds ScummVM has to play were sampled at either
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22050 Hz or 11025 Hz. Using a higher sample rate will not magically improve the
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quality of these sounds. Hence, 22050 Hz is fine.
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Some games use CD audio. If you use compressed files for this, they are
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probably sampled at 44100 Hz, so for these games that may be a better choice of
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sample rate.
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When using the Adlib, FM Towns, PC Speaker or IBM PCjr music drivers, ScummVM
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is responsible for generating the samples. Usually 22050 Hz will be plenty for
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these, but there is at least one piece of Adlib music in Beneath a Steel Sky
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that will sound a lot better at 44100 Hz.
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Using frequencies in between is not recommended. For one thing, your sound card
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may not support it. In theory, ScummVM should fall back on a sensible frequency
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in that case, but don't count on it. More importantly, ScummVM has to resample
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all sounds to its output frequency. This is much easier to do well if the
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output frequency is a multiple of the original frequency.
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