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CoCo Speech/Sound Pak: fix noise on reset (#8098)

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tim lindner 2021-05-26 04:25:22 -07:00 committed by GitHub
parent 9d2a5245ff
commit e43e9b68f6
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 22 additions and 26 deletions
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31
src/devices/bus/coco/coco_ssc.cpp
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@ -141,7 +141,7 @@ namespace
static constexpr int BUFFER_SIZE = 4;
private:
sound_stream* m_stream;
double m_rms[BUFFER_SIZE];
float m_rms[BUFFER_SIZE];
int m_index;
};
};
@ -237,7 +237,7 @@ void coco_ssc_device::device_start()
void coco_ssc_device::device_reset()
{
m_reset_line = 0;
m_reset_line = 1;
m_tms7000_busy = false;
}
@ -314,7 +314,6 @@ u8 coco_ssc_device::ff7d_read(offs_t offset)
data & 0x02 ? '1' : '0',
data & 0x01 ? '1' : '0',
data );
break;
}
@ -338,15 +337,12 @@ void coco_ssc_device::ff7d_write(offs_t offset, u8 data)
m_spo->reset();
}
if( (m_reset_line & 1) == 1 )
{
if( (data & 1) == 0 )
if( ((m_reset_line & 1) == 1) && ((data & 1) == 0) )
{
m_tms7040->reset();
m_ay->reset();
m_tms7000_busy = false;
}
}
m_reset_line = data;
break;
@ -415,9 +411,9 @@ void coco_ssc_device::ssc_port_c_w(u8 data)
}
}
if( (data & C_ALD) == 0 )
if( ((m_tms7000_portc & C_ALD) == C_ALD) && ((data & C_ALD) == 0) && (m_tms7000_portd < 64) )
{
m_spo->ald_w(m_tms7000_portd);
m_spo->ald_w(m_tms7000_portd); /* load allophone */
}
if( ((m_tms7000_portc & C_BSY) == 0) && ((data & C_BSY) == C_BSY) )
@ -485,7 +481,7 @@ cocossc_sac_device::cocossc_sac_device(const machine_config &mconfig, const char
m_stream(nullptr),
m_index(0)
{
std::fill(std::begin(m_rms), std::end(m_rms), 0);
std::fill(std::begin(m_rms), std::end(m_rms), 0.0f);
}
@ -515,10 +511,9 @@ void cocossc_sac_device::sound_stream_update(sound_stream &stream, std::vector<r
{
for( int sampindex = 0; sampindex < count; sampindex++ )
{
// sum the squares
m_rms[m_index] += src.get(sampindex) * src.get(sampindex);
// copy from source to destination
dst.put(sampindex, src.get(sampindex));
auto source_sample = src.get(sampindex);
m_rms[m_index] += source_sample * source_sample;
dst.put(sampindex, source_sample);
}
m_rms[m_index] = m_rms[m_index] / count;
@ -526,7 +521,7 @@ void cocossc_sac_device::sound_stream_update(sound_stream &stream, std::vector<r
}
m_index++;
m_index &= BUFFER_SIZE;
m_index &= (BUFFER_SIZE-1);
}
@ -536,8 +531,8 @@ void cocossc_sac_device::sound_stream_update(sound_stream &stream, std::vector<r
bool cocossc_sac_device::sound_activity_circuit_output()
{
double sum = std::accumulate(std::begin(m_rms), std::end(m_rms), 0.0);
double average = (sum / BUFFER_SIZE);
float sum = std::accumulate(std::begin(m_rms), std::end(m_rms), 0.0f);
float average = (sum / BUFFER_SIZE);
return average < 0.08;
return average < 0.317f;
}

1
src/mame/drivers/coco12.cpp
View File

@ -433,6 +433,7 @@ void coco_state::coco_sound(machine_config &config)
void coco_state::coco_floating_map(address_map &map)
{
map(0x0000, 0xFFFF).r(FUNC(coco_state::floating_bus_r));
map(0x0000, 0xFFFF).nopw(); /* suppress log warnings */
}