From 5943373e917a7dec185dd1ecbddbf27a4febdc5c Mon Sep 17 00:00:00 2001 From: cam900 Date: Fri, 27 Apr 2018 17:46:34 +0900 Subject: [PATCH] c6280.cpp : Fix LFO <<1 is same at patent, not +1 (reference:https://patents.google.com/patent/US4924744A/) --- src/devices/sound/c6280.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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];