From 104133eeb4cff907d9aedf4763659252b8c5786f Mon Sep 17 00:00:00 2001
From: kub <derkub@gmail.com>
Date: Fri, 28 Mar 2025 08:41:51 +0100
Subject: [PATCH] core, make dc filter reacting faster (arm)

---
 pico/sound/mix_arm.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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
 
-- 
2.39.5