diff --git a/src/emu/sound/aicadsp.c b/src/emu/sound/aicadsp.c
index 1879ea89ff8..65d6e3358cb 100644
--- a/src/emu/sound/aicadsp.c
+++ b/src/emu/sound/aicadsp.c
@@ -24,6 +24,7 @@ static UINT16 PACK(INT32 val)
 	else
 		val <<= 11;
 	val >>= 11;
+	val &= 0x7FF;
 	val |= sign << 15;
 	val |= exponent << 11;
 
@@ -40,7 +41,10 @@ static INT32 UNPACK(UINT16 val)
 	mantissa = val & 0x7FF;
 	uval = mantissa << 11;
 	if (exponent > 11)
+	{
 		exponent = 11;
+		uval |= sign << 22;
+	}
 	else
 		uval |= (sign ^ 1) << 22;
 	uval |= sign << 23;
diff --git a/src/emu/sound/scspdsp.c b/src/emu/sound/scspdsp.c
index bb30dd376be..0415aebf021 100644
--- a/src/emu/sound/scspdsp.c
+++ b/src/emu/sound/scspdsp.c
@@ -24,6 +24,7 @@ static UINT16 PACK(INT32 val)
 	else
 		val <<= 11;
 	val >>= 11;
+	val &= 0x7FF;
 	val |= sign << 15;
 	val |= exponent << 11;
 
@@ -40,7 +41,10 @@ static INT32 UNPACK(UINT16 val)
 	mantissa = val & 0x7FF;
 	uval = mantissa << 11;
 	if (exponent > 11)
+	{
 		exponent = 11;
+		uval |= sign << 22;
+	}
 	else
 		uval |= (sign ^ 1) << 22;
 	uval |= sign << 23;