-#ifndef _DB_H
-#define _DB_H 1
+#ifndef _DECIBEL_H
+#define _DECIBEL_H 1
// Utility routines for working with decibels.
static inline double from_db(double db) { return pow(10.0, db / 20.0); }
static inline double to_db(double val) { return 20.0 * log10(val); }
-#endif // !defined(_DB_H)
+#endif // !defined(_DECIBEL_H)