| Re: [hatari-devel] New cycle exact YM2149 emulation |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] New cycle exact YM2149 emulation
- From: David Savinkoff <dsavnkff@xxxxxxxxx>
- Date: Sat, 17 Jun 2017 22:01:57 -0600 (MDT)
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- Thread-topic: New cycle exact YM2149 emulation
----- Nicolas Pomarède wrote:
>
> From a few comparisons with my STF, I would say that Hatari result is a
> little bit too attenuated and should be a little more "sharp", but not
> as much as when turning filter off completely.
>
> Nicolas
>
This patch changes filter coefficients for a sharper sound.
I can make more patches until the timbre is right.
--- hatari/src/sound.c 2017-06-17 20:06:59.678017765 -0700
+++ hatari/src/sound.c 2017-06-17 20:20:56.588497567 -0700
@@ -433,7 +433,10 @@
y0 = (3*(x0 + x1) + (y0<<1)) >> 3;
else
/* R8 Pull down: fc = 1992.0 Hz (44.1 KHz), fc = 2168.0 Hz (48 KHz) */
- y0 = ((x0 + x1) + (6*y0)) >> 3;
+ /* y0 = ((x0 + x1) + (6*y0)) >> 3; */
+
+ /* R8 Pull down: fc = 4516.6 Hz (44.1 KHz), fc = 4916.0 Hz (48 KHz) */
+ y0 = ((x0 + x1) + (y0<<1)) >> 2;
x1 = x0;
return y0;