seiichi horie / Mbed 2 deprecated synthesizer_f746

Synthesizer based on the Unzen / Nucleo F746ZG

Dependencies:   amakusa mbed-dsp mbed shimabara ukifune unzen_nucleo_f746

Fork of skeleton_unzen_nucleo_f746 by seiichi horie

雲仙フレームワークのテストとして作っているプロジェクトです。中身はどんどん変っていきます。 説明はDSP空挺団の「シンセサイザー」カテゴリーを参照してください。初回は「ドッグフードを食べる」です。

signal_processing.h@19:f5e785fe50b1, 2017-02-03 (annotated)

Committer:
shorie
Date:
Fri Feb 03 14:35:46 2017 +0000
Revision:
19:f5e785fe50b1
Parent:
18:b9b1116f8768
Child:
20:53021b2c424d
Total structure is refactored to use the Monophonic.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shorie 6:486b1cb03e61 1 #ifndef _SIGNAL_PROCESSING_H_
shorie 6:486b1cb03e61 2 #define _SIGNAL_PROCESSING_H_
shorie 6:486b1cb03e61 3
shorie 6:486b1cb03e61 4 #include "amakusa.h"
shorie 6:486b1cb03e61 5
shorie 18:b9b1116f8768 6 #define SAMPLING_FREQUENCY 48000
shorie 14:cec63d8da48c 7
shorie 18:b9b1116f8768 8 enum wave_form { triangle, square };
shorie 18:b9b1116f8768 9
shorie 18:b9b1116f8768 10 // Variable Frequency Oscillator. Only square and triangle
shorie 14:cec63d8da48c 11 class VFO {
shorie 14:cec63d8da48c 12 public:
shorie 14:cec63d8da48c 13 VFO( void );
shorie 18:b9b1116f8768 14 virtual ~VFO(void);
shorie 14:cec63d8da48c 15 void run(
shorie 18:b9b1116f8768 16 float out_buffer[], // place to write the right output samples
shorie 14:cec63d8da48c 17 unsigned int block_size // block size [sample]
shorie 14:cec63d8da48c 18 );
shorie 14:cec63d8da48c 19
shorie 14:cec63d8da48c 20 // parameter settings
shorie 18:b9b1116f8768 21 void set_frequency( int freq ); // unit is Hz.
shorie 18:b9b1116f8768 22 void set_Fs( int Fs ); // unit is Hz.
shorie 14:cec63d8da48c 23 void set_duty_cycle( float duty ); // 0 ... 0.5
shorie 18:b9b1116f8768 24 void set_wave_form( wave_form form );
shorie 14:cec63d8da48c 25 private:
shorie 14:cec63d8da48c 26
shorie 16:d4ea3e6a0bce 27 // control variables.
shorie 14:cec63d8da48c 28 int frequency; // VFO frequency [Hz]
shorie 14:cec63d8da48c 29 int Fs; // sampling Frequency [Hz]
shorie 14:cec63d8da48c 30 float duty_cycle; // VFO duty cycle. 0 ... 0.5
shorie 18:b9b1116f8768 31 wave_form form; // form of the wave form.
shorie 15:de22b9d147e0 32
shorie 16:d4ea3e6a0bce 33 // internal variable.
shorie 19:f5e785fe50b1 34 int current_phase; // internal variable of VFO.
shorie 16:d4ea3e6a0bce 35 int half_way; // change point by duty cycle. ( period * duty_cycle ).
shorie 16:d4ea3e6a0bce 36 float rising_rate;
shorie 16:d4ea3e6a0bce 37 float falling_rate;
shorie 16:d4ea3e6a0bce 38
shorie 16:d4ea3e6a0bce 39 void update_parameters(void); // call one of the parameter is changed.
shorie 14:cec63d8da48c 40 };
shorie 14:cec63d8da48c 41
shorie 19:f5e785fe50b1 42 // Blocking DC
shorie 19:f5e785fe50b1 43 class DCBlocker : public amakusa::AbstractFilter {
shorie 19:f5e785fe50b1 44 public:
shorie 19:f5e785fe50b1 45 DCBlocker( uint32_t blockSize );
shorie 19:f5e785fe50b1 46 virtual void run( float32_t *pSrc, float32_t *pDst, uint32_t blockSize = 0 );
shorie 19:f5e785fe50b1 47 private:
shorie 19:f5e785fe50b1 48 float x_last;
shorie 19:f5e785fe50b1 49 float y_last;
shorie 19:f5e785fe50b1 50 };
shorie 19:f5e785fe50b1 51
shorie 18:b9b1116f8768 52 // Monophonic synthsizer class
shorie 18:b9b1116f8768 53 class Monophonic {
shorie 18:b9b1116f8768 54 public:
shorie 18:b9b1116f8768 55 Monophonic( unsigned int block_size );
shorie 18:b9b1116f8768 56 virtual ~Monophonic(void);
shorie 18:b9b1116f8768 57 void run(
shorie 18:b9b1116f8768 58 float out_buffer[], // place to write the right output samples
shorie 18:b9b1116f8768 59 unsigned int block_size // block size [sample]
shorie 18:b9b1116f8768 60 );
shorie 18:b9b1116f8768 61 void set_Fs( int Fs ); // unit is Hz.
shorie 18:b9b1116f8768 62 void set_vfo_frequency( int freq ); // unit is Hz.
shorie 18:b9b1116f8768 63 void set_vfo_duty_cycle( float duty ); // 0 ... 0.5
shorie 18:b9b1116f8768 64 void set_vfo_wave_form( wave_form form );
shorie 18:b9b1116f8768 65 private:
shorie 18:b9b1116f8768 66 VFO *vfo;
shorie 18:b9b1116f8768 67 };
shorie 18:b9b1116f8768 68
shorie 14:cec63d8da48c 69
shorie 6:486b1cb03e61 70 // User Signal processing Class
shorie 6:486b1cb03e61 71 class SignalProcessing {
shorie 6:486b1cb03e61 72 public:
shorie 6:486b1cb03e61 73 // essential members. Do not touch
shorie 6:486b1cb03e61 74 SignalProcessing( unsigned int block_size );
shorie 6:486b1cb03e61 75 void run(
shorie 6:486b1cb03e61 76 float rx_left_buffer[], // array of the left input samples
shorie 6:486b1cb03e61 77 float rx_right_buffer[], // array of the right input samples
shorie 6:486b1cb03e61 78 float tx_left_buffer[], // place to write the left output samples
shorie 13:b33cb5925113 79 float tx_right_buffer[], // place to write the right output samples
shorie 6:486b1cb03e61 80 unsigned int block_size // block size [sample]
shorie 6:486b1cb03e61 81 );
shorie 6:486b1cb03e61 82
shorie 6:486b1cb03e61 83 // project depenedent members.
shorie 6:486b1cb03e61 84 void set_volume( float vol );
shorie 14:cec63d8da48c 85 void set_Fs( int Fs ); // unit is Hz.
shorie 15:de22b9d147e0 86 void set_vfo_frequency( int freq ); // unit is Hz.
shorie 15:de22b9d147e0 87 void set_vfo_duty_cycle( float duty ); // 0 ... 0.5
shorie 18:b9b1116f8768 88 void set_vfo_wave_form( wave_form form );
shorie 6:486b1cb03e61 89 private:
shorie 6:486b1cb03e61 90 // essential members. Do not touch.
shorie 6:486b1cb03e61 91 void enter_critical_section(void);
shorie 6:486b1cb03e61 92 void leave_critical_section(void);
shorie 6:486b1cb03e61 93
shorie 6:486b1cb03e61 94 // project dependent members.
shorie 14:cec63d8da48c 95 float volume_level; // 0 ... 1.0
shorie 18:b9b1116f8768 96 Monophonic * note;
shorie 6:486b1cb03e61 97 };
shorie 6:486b1cb03e61 98
shorie 6:486b1cb03e61 99 #endif