diff --git a/audio/aidl/vts/EffectHelper.h b/audio/aidl/vts/EffectHelper.h
index 5c75e48..e334ee9 100644
--- a/audio/aidl/vts/EffectHelper.h
+++ b/audio/aidl/vts/EffectHelper.h
@@ -88,6 +88,7 @@
 static constexpr int kNPointFFT = 16384;
 static constexpr int kSamplingFrequency = 44100;
 static constexpr int kDefaultChannelLayout = AudioChannelLayout::LAYOUT_STEREO;
+static constexpr float kLn10Div20 = -0.11512925f;  // -ln(10)/20
 
 class EffectHelper {
   public:
@@ -595,6 +596,8 @@
         }
     }
 
+    constexpr float dBToAmplitude(float dB) { return std::exp(dB * kLn10Div20); }
+
     static int getHalVersion(const std::shared_ptr<IEffect>& effect) {
         int version = 0;
         return (effect && effect->getInterfaceVersion(&version).isOk()) ? version : 0;