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spkrdev: change device description, it's not 1bit

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hap 2021-05-03 23:39:05 +02:00
parent 68c537a52d
commit 2cf018ffd2
1 changed files with 5 additions and 5 deletions
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10
src/devices/sound/spkrdev.cpp
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@ -74,14 +74,14 @@
#include "emu.h"
#include "sound/spkrdev.h"
static constexpr double default_levels[2] = {0.0, 1.0};
// The default is 1-bit, but can be customized with set_levels.
static constexpr double default_levels[2] = { 0.0, 1.0 };
// Internal oversampling factor (intermediate samples vs stream samples)
static constexpr int RATE_MULTIPLIER = 4;
DEFINE_DEVICE_TYPE(SPEAKER_SOUND, speaker_sound_device, "speaker_sound_device", "Filtered 1-bit DAC")
DEFINE_DEVICE_TYPE(SPEAKER_SOUND, speaker_sound_device, "speaker_sound_device", "Filtered DAC")
speaker_sound_device::speaker_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
@ -143,9 +143,9 @@ void speaker_sound_device::device_start()
*/
#define FILTER_STEP (M_PI / 2 / RATE_MULTIPLIER)
/* Distribute symmetrically on x axis; center has x=0 if length is odd */
for (i = 0, x = (0.5 - FILTER_LENGTH / 2.) * FILTER_STEP;
for (i = 0, x = (0.5 - FILTER_LENGTH / 2.) * FILTER_STEP;
i < FILTER_LENGTH;
i++, x += FILTER_STEP)
i++, x += FILTER_STEP)
{
if (x == 0)
m_ampl[i] = 1;