From f3c22ed3cca0961c29806f0387ac3585e4af3ee4 Mon Sep 17 00:00:00 2001
From: Ahmet Inan <inan@aicodix.de>
Date: Thu, 3 Jan 2019 20:20:56 +0100
Subject: [PATCH] added delta() and decibel() to utils

---
 README.md |  2 ++
 utils.hh  | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/README.md b/README.md
index 1e16bdb..97e6cb7 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,8 @@ Some everyday helpers:
 * [lerp function](https://en.wikipedia.org/wiki/Linear_interpolation)
 * [probability density function](https://en.wikipedia.org/wiki/Probability_density_function) of the [normal distribution](https://en.wikipedia.org/wiki/Normal_distribution)
 * [sinc function](https://en.wikipedia.org/wiki/Sinc_function)
+* [delta function](https://en.wikipedia.org/wiki/Dirac_delta_function)
+* [decibel function](https://en.wikipedia.org/wiki/Decibel)
 
 ### [resampler.hh](resampler.hh)
 
diff --git a/utils.hh b/utils.hh
index c155ee2..415ff3e 100644
--- a/utils.hh
+++ b/utils.hh
@@ -35,6 +35,18 @@ TYPE sinc(TYPE x)
 	return TYPE(0) == x ? TYPE(1) : std::sin(Const<TYPE>::Pi() * x) / (Const<TYPE>::Pi() * x);
 }
 
+template <typename TYPE>
+TYPE delta(TYPE x)
+{
+	return TYPE(0) == x ? TYPE(1) : TYPE(0);
+}
+
+template <typename TYPE>
+TYPE decibel(TYPE v)
+{
+	return TYPE(10) * std::log10(v);
+}
+
 }
 
 #endif