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author cam900 <dbtlrchl@naver.com>2018-04-27 17:46:34 +0900
committer Vas Crabb <cuavas@users.noreply.github.com>2018-04-28 00:11:51 +1000
commit5943373e917a7dec185dd1ecbddbf27a4febdc5c (patch)
tree0ab654a3e40f1a1ba5f53f55414c23688446fc18 /src/devices/sound
parent636481edbd0b6d65da6bb545db0b0d13f03661ef (diff)
c6280.cpp : Fix LFO
<<1 is same at patent, not +1 (reference:https://patents.google.com/patent/US4924744A/)
Diffstat (limited to 'src/devices/sound')
-rw-r--r--src/devices/sound/c6280.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/sound/c6280.cpp b/src/devices/sound/c6280.cpp
index 8a72c691a3e..c0a91f36651 100644
--- a/src/devices/sound/c6280.cpp
+++ b/src/devices/sound/c6280.cpp
@@ -130,7 +130,7 @@ void c6280_device::sound_stream_update(sound_stream &stream, stream_sample_t **i
m_channel[1].m_counter &= 0x1FFFF;
lfo_data = m_channel[1].m_waveform[lfooffset];
if (m_lfo_control & 3)
- step += ((lfo_data - 16) << ((m_lfo_control-1)+1)); // verified from patent, TODO : same in real hardware?
+ step += ((lfo_data - 16) << ((m_lfo_control-1)<<1)); // verified from patent, TODO : same in real hardware?
offset = (m_channel[0].m_counter >> 12) & 0x1F;
m_channel[0].m_counter += m_wave_freq_tab[step & 0xfff];