Sebastian Kaliszewski wrote:
Joachim Henke wrote:
Ok, these are really strong arguments. Thanks a lot for your
interesting statements! I'll do some testing on square waves and will
post an updated patch, as I am also not totally satisfied with the
current sound myself.
One little suggestion...
Real PC-speaker is rather poor source of sound, and I also noticed, that
sound cards which took PC-speaker sound for themselves (some SB-clones
did route PC-speaker sound into thier own output) liked to low-pass
filter the resulting audio. So to make things as real as feasible, use
your wave table to store something like square wave with rounded corners
-- maybe sth like pow(sin(x), 0.2) (i.e. sinus rooted to 5th degree)
will sound pleasant enough.
If you want to model the real PC speaker, the best to do is to generate
a square signal and to pass it thru a low pass filter with a cut off
frequency of a few kHz. Then you could even be able to play samples thru
the simulated PC speaker using the tricks used in old MSDOS programs,
provided QEMU implements a precise cycle counter (it will come someday !).
Fabrice.
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