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Re: [Qemu-devel] [PATCH] PC speaker emulation (fixed point)

From: Sebastian Kaliszewski
Subject: Re: [Qemu-devel] [PATCH] PC speaker emulation (fixed point)
Date: Tue, 24 Jan 2006 19:29:44 +0100
User-agent: Mozilla Thunderbird 1.0.2 (X11/20050322)

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.

Sebastian Kaliszewski

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