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swp00: small fixes to the lpf, may need more bits in the calculation though

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Olivier Galibert 2023-10-01 21:46:27 +02:00
parent 7906b34f3d
commit 95fcb3123b
1 changed files with 2 additions and 2 deletions
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4
src/devices/sound/swp00.cpp
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@ -992,9 +992,9 @@ void swp00_device::sound_stream_update(sound_stream &stream, std::vector<read_st
s32 mul = m_sample_pos[chan] & 0x7fff;
s16 sample = (val1 * mul + val0 * (0x8000 - mul)) >> 15;
s32 lpf_value = m_lpf_value[chan] + ((lfo_fa_phase * m_lfo_pmod_depth[chan]) << (m_lfo_step[chan] & 0x40 ? 2 : 1));
s32 lpf_value = m_lpf_value[chan] + ((lfo_fa_phase * (m_lfo_famod_depth[chan] >> 5)) << (m_lfo_step[chan] & 0x40 ? 2 : 1));
m_lpf_ha[chan] += lpffpapply(lpf_value, sample - fpapply(m_lpf_feedback[chan], m_lpf_ha[chan]) - m_lpf_hb[chan]);
m_lpf_ha[chan] += lpffpapply(lpf_value, sample - 2*fpapply(m_lpf_feedback[chan], m_lpf_ha[chan]) - m_lpf_hb[chan]);
m_lpf_hb[chan] += lpffpapply(lpf_value, m_lpf_ha[chan]);
sample = m_lpf_hb[chan];