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Fixed clamping to 12 bit range to Okim6376, and adjusted

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volume attenuation accordingly (Mirko Buffoni)
This commit is contained in:
Mirko Buffoni 2009-01-21 13:45:21 +00:00
parent 1901ac8f3a
commit 771e2d4ab4
1 changed files with 8 additions and 8 deletions
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16
src/emu/sound/okim6376.c
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@ -54,10 +54,10 @@ static int diff_lookup[49*16];
attenuation to apply to the sound signal. */ attenuation to apply to the sound signal. */
static int volume_table[4] = static int volume_table[4] =
{ {
0x10, // 0 dB 0x20, // 0 dB
0x08, // -6.0 dB 0x10, // -6.0 dB
0x04, // -12.0 dB 0x08, // -12.0 dB
0x02, // -24.0 dB 0x04, // -24.0 dB
}; };
/* tables computed? */ /* tables computed? */
@ -136,10 +136,10 @@ static INT16 clock_adpcm(struct ADPCMVoice *voice, UINT8 nibble)
voice->signal += diff_lookup[voice->step * 16 + (nibble & 15)]; voice->signal += diff_lookup[voice->step * 16 + (nibble & 15)];
/* clamp to the maximum 12bit */ /* clamp to the maximum 12bit */
if (voice->signal > 4095) if (voice->signal > 2047)
voice->signal = 4095; voice->signal = 2047;
else if (voice->signal < -4096) else if (voice->signal < -2048)
voice->signal = -4096; voice->signal = -2048;
/* adjust the step size and clamp */ /* adjust the step size and clamp */
voice->step += index_shift[nibble & 7]; voice->step += index_shift[nibble & 7];