From b7dd57c64fc8607c1bf08ba00fdaa1fdb200037d Mon Sep 17 00:00:00 2001
From: Vladimir <i@vladimir.cc>
Date: Tue, 14 Jul 2026 20:23:49 +0300
Subject: [PATCH] fix(dmr): raise decoded voice level

---
 DMRDecoder.pas | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/DMRDecoder.pas b/DMRDecoder.pas
index 0190ca7..c834aeb 100644
--- a/DMRDecoder.pas
+++ b/DMRDecoder.pas
@@ -190,6 +190,7 @@ const
   // mbelib's floating-point API retains the signed 16-bit PCM scale. EWSDR's
   // audio outputs use normalized floating point, where full scale is +/-1.0.
   DMR_PCM_SCALE = 1.0 / 32768.0;
+  DMR_PCM_GAIN  = 1.5; // +3.5 dB nominal voice level before user volume
   DMR_SUPERFRAME_SAMPLES = DMR_INPUT_RATE * 360 div 1000;
   DMR_SYNC_CADENCE_TOLERANCE = DMR_SAMPLES_PER_SYM * 3;
 
@@ -823,7 +824,7 @@ begin
     if MbeResult.ErrorsTotal > 0 then Inc(FVoiceErrorCount, MbeResult.ErrorsTotal);
     for SampleIndex := 0 to High(PCM) do
     begin
-      PCM[SampleIndex] := PCM[SampleIndex] * DMR_PCM_SCALE;
+      PCM[SampleIndex] := PCM[SampleIndex] * DMR_PCM_SCALE * DMR_PCM_GAIN;
       if PCM[SampleIndex] > 1.0 then PCM[SampleIndex] := 1.0
       else if PCM[SampleIndex] < -1.0 then PCM[SampleIndex] := -1.0;
     end;