From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] PC speaker emulation (square wave)
Date: Thu, 26 Jan 2006 04:50:43 +0000 [thread overview]
Message-ID: <20060126045043.GA23296@mail.shareable.org> (raw)
In-Reply-To: <ED00D612-2AD2-4BE8-AC9A-585C70F4660D@gmx.de>
Joachim Henke wrote:
> Ok, I simplified my patch to generate just plain square waves.
> Indeed, its sound is much closer to a real PC speaker now.
>
> Does "cut off frequency" mean, that we have silence above that
> specific frequency? I changed my patch to go this way. Before, it
> always played the highest possible frequency for that case (f > 16 kHz).
No, it means the higher-frequency harmonic components of the square
wave are attenuated, which affects how it sounds. Filtering a square
wave in this way is particularly simple, but unlikely to be worth the
effort.
-- Jamie
next prev parent reply other threads:[~2006-01-26 4:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-09 19:01 [Qemu-devel] [patch] minimal PC speaker output Joachim Henke
2006-01-09 20:40 ` Fabrice Bellard
2006-01-10 9:11 ` he.jo
2006-01-18 23:05 ` [Qemu-devel] [PATCH] PC speaker emulation Joachim Henke
2006-01-18 23:32 ` [Qemu-devel] " Joachim Henke
2006-01-19 0:32 ` [Qemu-devel] " malc
2006-01-19 20:44 ` [Qemu-devel] [PATCH] PC speaker emulation (fixed) Joachim Henke
2006-01-19 23:29 ` malc
2006-01-20 9:42 ` Joachim Henke
2006-01-20 13:03 ` Johannes Schindelin
2006-01-20 12:03 ` Sebastian Kaliszewski
2006-01-23 21:10 ` [Qemu-devel] [PATCH] PC speaker emulation (fixed point) Joachim Henke
2006-01-24 12:35 ` Sebastian Kaliszewski
2006-01-24 15:50 ` Joachim Henke
2006-01-24 18:29 ` Sebastian Kaliszewski
2006-01-24 21:45 ` Fabrice Bellard
2006-01-25 0:38 ` Sebastian Kaliszewski
2006-01-25 21:54 ` [Qemu-devel] [PATCH] PC speaker emulation (square wave) Joachim Henke
2006-01-26 4:50 ` Jamie Lokier [this message]
2006-01-26 16:55 ` Sebastian Kaliszewski
2006-01-29 10:44 ` Joachim Henke
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