// license:BSD-3-Clause // copyright-holders:Aaron Giles #ifndef MAME_SOUND_CEM3394_H #define MAME_SOUND_CEM3394_H #pragma once #include "sound/va_vcf.h" class cem3394_device : public device_t, public device_sound_interface { public: // inputs // Each of these CV inputs can either be specified with `set_voltage()`, or // provided via a sound stream. enum { AUDIO_INPUT = 0, // not valid for set_voltage() VCO_FREQUENCY, MODULATION_AMOUNT, WAVE_SELECT, PULSE_WIDTH, MIXER_BALANCE, FILTER_RESONANCE, FILTER_FREQUENCY, FINAL_GAIN, INPUT_COUNT }; cem3394_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0) ATTR_COLD; // The constructor will initialize components values to those recommended // in the datasheet. configure() can be used to change those. // r_vco: Pin 1 - Resistor to VEE. Sets reference current for the VCO internals. // c_vco: Pin 4 - VCO timing capacitor. // c_vcf: Pin 12 (or 13, or 14, they should be equal) - VCF capacitor. // c_ac: Pin 17 - AC-coupling capacitor on the VCF output. cem3394_device &configure(double r_vco, double c_vco, double c_vcf, double c_ac) ATTR_COLD; protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; virtual void device_start() override ATTR_COLD; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream) override; public: // Set the voltage going to a particular parameter void set_voltage(int input, double voltage); // Requesting a streaming voltage will force a stream update. double get_voltage(int input); // Get the translated parameter associated with the given input as follows: // VCO_FREQUENCY: frequency in Hz // MODULATION_AMOUNT: scale factor, 0.0 to 2.0 // WAVE_SELECT: voltage from this line // PULSE_WIDTH: width fraction, from 0.0 to 1.0 // MIXER_BALANCE: balance, from -1.0 to 1.0 // FILTER_RESONANCE: resonance, from 0.0 to 1.0 // FILTER_FREQUENCY: frequency, in Hz // FINAL_GAIN: gain, in dB // Requesting a parameter associated with a streaming input will force a // stream update. double get_parameter(int input); private: double compute_db(double voltage); sound_stream::sample_t compute_db_volume(double voltage); void set_voltage_internal(int input, double voltage); double hpf(double input); required_device m_vcf; // device configuration, not needed in save state sound_stream *m_stream; // our stream double m_inv_sample_rate; // 1/current sample rate double m_vco_zero_freq; // frequency of VCO at 0.0V double m_filter_zero_freq; // frequency of filter at 0.0V double m_hpf_k; // RC filter coefficient for AC coupling // device state double m_values[INPUT_COUNT]; // raw values of registers u8 m_wave_select; // flags which waveforms are enabled double m_volume; // linear overall volume (0-1) double m_mixer_internal; // linear internal volume (0-1) double m_mixer_external; // linear external volume (0-1) double m_vco_position; // current VCO frequency position (always < 1.0) double m_vco_step; // per-sample VCO step double m_filter_frequency; // baseline filter frequency double m_filter_modulation; // depth of modulation (up to 1.0) double m_filter_resonance; // depth of modulation (up to 1.0) double m_pulse_width; // fractional pulse width double m_hpf_mem; // AC coupling filter memory }; DECLARE_DEVICE_TYPE(CEM3394, cem3394_device) #endif // MAME_SOUND_CEM3394_H