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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 13:35:32 +0100
User-agent: Mozilla Thunderbird 1.0.2 (X11/20050322)

Joachim Henke wrote:
I still prefer using a sine wave, it sounds more smooth and won't hurt our ears (and speakers) too much.

Well, it sounds rather dull, and even worse, on non hi-fi computer speakers (which is 90% of PC users use) low frequencies (<100Hz) are simply unhearable (since equipment is very poor at transmitting those frequencies). While harmonics rich square wave will be hearable, due to harmonics being hearable.

I don't think that people want to play square waves, when they have their PC connected to their hifi system

Many people connected their Apples IIs, Commodores 64s & Ataris 800s to their Hi-Fi equipment, and those didn't break their ears nor equipment.

(c: The main purpose of the PC speaker is to generate tones and many programmers used it to play melodies. Why shouldn't we take this chance to make it sound as good as we can manage it?

Exactly. No real musical instrument generates sine wawes. Moreover as various psyhoacustics reaserch shows, using pure sine waes changes our perception of chords & harmony. Then 95% of home sound equipment degrages and attenuates low frequencies below 40-50Hz.

If Qemu is for emulation it should emulate things as close to reality as feasible. Why do more work & intentionally break the close emulation, while it's even easier to acheive?

However, this approach should still be sufficient for our purpose. Most programs don't use too low frequencies, and if they do, people probably won't notice.

Many PC games used low frequencies to emit varius buzzes and stuff (like engine noise). With sine wave those will be completely broken.

Sebastian Kaliszewski

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