From d08840a61f405bc89e730c0cef51537e89e6dbb5 Mon Sep 17 00:00:00 2001
From: Volker Fischer <corrados@users.noreply.github.com>
Date: Wed, 3 May 2023 17:23:12 +0200
Subject: replace sqrt scaling of normalized input velocity by a curve function
similar to what is implemented in Edrumulus
---
src/inputprocessor.cc | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
(limited to 'src')
diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index a15c9c1..f0b2935 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -298,9 +298,12 @@ auto target_max_power_db = 10 * log10(instr->getMaxPower());
auto sel_power_db = 10 * log10(sample->getPower());
auto target_dynamic_db = 40.0; // dB
-auto target_power_db = sqrt(event.velocity) * target_dynamic_db + target_max_power_db - target_dynamic_db;
-auto diff_power_db = target_power_db - sel_power_db;
-event_sample.scale = pow(10.0, diff_power_db / 20);
+static auto a = 0.981;
+static auto factor = 126.0f / (pow(a, 126.0f) - 1.0f);
+auto y = (factor * (pow(a, event.velocity * 127.0f - 1.0f) - 1.0f) + 1.0f) / 127.0f;
+auto target_power_db = y * target_dynamic_db + target_max_power_db - target_dynamic_db;
+auto diff_power_db = target_power_db - sel_power_db;
+event_sample.scale = pow(10.0, diff_power_db / 20);
//printf("event_sample.scale: %f, diff_power_db: %f, target_power_db: %f, sel_power_db: %f\n", event_sample.scale, diff_power_db, target_power_db, sel_power_db);
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