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-rw-r--r--src/emu/sound/discrete.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/emu/sound/discrete.h b/src/emu/sound/discrete.h
index 2abc171fe83..6fb097cea89 100644
--- a/src/emu/sound/discrete.h
+++ b/src/emu/sound/discrete.h
@@ -3412,6 +3412,8 @@
#define RC_DISCHARGE_EXP_DT(rc, dt) (exp(-(dt) / (rc)))
#define RC_DISCHARGE_NEG_EXP_DT(rc, dt) (exp((dt) / (rc)))
+#define FREQ_OF_555(_r1, _r2, _c) (1.49 / ((_r1 + 2 * _r2) * _c))
+
/*************************************
*
* Interface & Naming