From 4aa64a7114df3f75af22527e612633b4b6bdd84a Mon Sep 17 00:00:00 2001
From: Jeff Pyke <jpyke@zoox.com>
Date: Fri, 20 Dec 2024 17:39:13 -0800
Subject: [PATCH] Fix spectrogram gain

---
 src/plugins/spectrogram.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/plugins/spectrogram.ts b/src/plugins/spectrogram.ts
index c6c0556e0..21d0516d7 100644
--- a/src/plugins/spectrogram.ts
+++ b/src/plugins/spectrogram.ts
@@ -345,8 +345,8 @@ class SpectrogramPlugin extends BasePlugin<SpectrogramPluginEvents, SpectrogramP
     this.frequencyMin = options.frequencyMin || 0
     this.frequencyMax = options.frequencyMax || 0
 
-    this.gainDB = options.gainDB || 20
-    this.rangeDB = options.rangeDB || 80
+    this.gainDB = options.gainDB ?? 20
+    this.rangeDB = options.rangeDB ?? 80
     this.scale = options.scale || 'mel'
     this.numMelFilters = options.numMelFilters || this.fftSamples / 8
     if (this.scale == 'mel') {
@@ -602,7 +602,7 @@ class SpectrogramPlugin extends BasePlugin<SpectrogramPluginEvents, SpectrogramP
         for (let j = 0; j < fftSamples / 2; j++) {
           // Based on: https://manual.audacityteam.org/man/spectrogram_view.html
           let valueDB = 20 * Math.log10(spectrum[j])
-          if (valueDB < -this.rangeDB) {
+          if (valueDB < -this.gainDB - this.rangeDB) {
             array[j] = 0
           } else if (valueDB > -this.gainDB) {
             array[j] = 255