From: kub <derkub@gmail.com>
Date: Fri, 28 Mar 2025 07:41:51 +0000 (+0100)
Subject: core, make dc filter reacting faster (arm)
X-Git-Tag: v2.04~11
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=104133eeb4cff907d9aedf4763659252b8c5786f;p=picodrive.git

core, make dc filter reacting faster (arm)
---

diff --git a/pico/sound/mix_arm.S b/pico/sound/mix_arm.S
index 64383c3a..486aa5b5 100644
--- a/pico/sound/mix_arm.S
+++ b/pico/sound/mix_arm.S
@@ -299,7 +299,7 @@ m16_32_rsm_end:
 @ in=int_sample (max 20 bit), y=filter memory, r8=tmp
 .macro DCfilt in y
     rsb     r8, \y, \in, lsl #12	@ fixpoint 20.12
-    add     \y, \y, r8, asr #12		@ alpha = 1-1/4094
+    add     \y, \y, r8, asr #9		@ alpha = 1-1/512
     sub     \in, \in, \y, asr #12
 .endm