蜂鳴器和弦音電路原理

原理介紹：

BP_PWR控制三極管Q5控制蜂鳴器的供電，Q5開啟後，給C6充電，此時Buzzer産生頻率，蜂鳴器發聲，音節快結束前，BP_PWR關閉Q5,此時蜂鳴器靠C6放電提供能量發聲，實現拖音和弦效果。

以下是基于瑞薩單片機實現代碼：

/******************************************************************************** 文件:Beep.c 功能:蜂鳴器和弦音，定義三種音，關機，開機，單音 Author:電子顔工 Time:2013.10.15 Recent Modify:2013.10.16 ******************************************************************************/ /*=======================以下是音調定義======================*/ #define Tone_C6 1 #define Tone_CS6 2 #define Tone_D6 3 #define Tone_DS6 4 #define Tone_E6 5 #define Tone_F6 6 #define Tone_FS6 7 #define Tone_G6 8 #define Tone_GS6 9 #define Tone_A6 10 #define Tone_AS6 11 #define Tone_B6 12 #define Tone_C7 13 #define Tone_CS7 14 #define Tone_D7 15 #define Tone_DS7 16 #define Tone_E7 17 #define Tone_F7 18 #define Tone_FS7 19 #define Tone_G7 20 #define Tone_GS7 21 #define Tone_A7 22 #define Tone_AS7 23 #define Tone_B7 24 #define END 0//音頻結束位 #define SYS_FREQ 8 // MHZ 系統時鐘 #define TIMER_CNT_BASE 1000000*SYS_FREQ/2 //定時器計數基數 #define BUZZER_IO P3_bit.no1 //BEEP IO #define BUZZER_OUT PM3_bit.no1=0 //Mode OUT #define BUZZER_PULL PU3_bit.no1=1 //Pull up #define PWR_CTRL P13_bit.no0 //蜂鳴器供電控制腳 #define BUZZERIO_INIT {BUZZER_OUT;BUZZER_PULL;} /*=========================音調頻率表=======================*/ const uint Tune_Tbl[24]= { //C6,CS6, D6 ,DS6 ,E6 F6 ,FS6 ,G6 ,GS6 ,A6 ,AS6 ,B6 1047,1109,1175,1245,1319,1397,1480,1568,1661,1760,1865,1976, //C7,CS7, D7 ,DS7 ,E7 F7 ,FS7 ,G7 ,GS7 ,A7 ,AS7 ,B7 2093,2217,2349,2489,2637,2794,2960,3136,3322,3520,3729,3951, }; /*======================關機和弦1,2,3...====================*/ const uchar Sound_ShutDown[10]= { Tone_C7,2,14,Tone_D7,2,6,Tone_E7,6,60,END }; /*======================開機和弦3,2,1...====================*/ const uchar Sound_PowerOn[10]= { Tone_E7,2,6,Tone_D7,2,14,Tone_C7,6,60,END }; /*======================單音和弦2...=======================*/ const uchar Sound_Single[10]= { Tone_D7,12,60,END,END,END,END,END,END,END, }; #define S_SHUTDOWN 1//關機音 #define S_POWERON 2//開機音 #define S_SINGLE 3//單音 const uchar (*pSoundSel)[10];//選曲指針 struct BE { uint CountFR; //定時器計數值，通過改變計數值改變音頻頻率 uchar PWR_time; //開啟時間,單位為10mS uchar FREQ_time; //音頻供給時間,單位為10mS uchar index; // }Beep; volatile union { uchar flag4; __BITS8 flag4_bit; }; #define Beep_EN flag4_bit.no0 #define Beep_Finish flag4_bit.no1 //和弦結束标志 /*======================================================= 函數名:Beep_On(uchar SoundSel) 傳入參數:SoundSel 功能:選擇聲音種類 調用:外部調用 =========================================================*/ __callt void Beep_On(uchar SoundSel) { Beep_EN=1; Beep.index=0; Beep_Finish=0; switch(SoundSel) { case S_SHUTDOWN: pSoundSel=&Sound_ShutDown; break; case S_POWERON: pSoundSel=&Sound_PowerOn; break; case S_SINGLE: pSoundSel=&Sound_Single; break; default: break; } } /*======================================================= 函數名:Beep_set() 功能:蜂鳴器參數設置 調用:Beep_control() =========================================================*/ __callt void Beep_set() { if ((*pSoundSel)[Beep.index]!=END) { Beep.CountFR=(uint)(TIMER_CNT_BASE/Tune_Tbl[(*pSoundSel)[Beep.index]-1]); Beep.PWR_time=(*pSoundSel)[Beep.index 1]; Beep.FREQ_time=(*pSoundSel)[Beep.index 2]; Beep.index=Beep.index 3; }else {Beep.index=0; PWR_CTRL=1;Beep_EN=0;Beep_Finish=1;} return; } /*======================================================= 函數名:Beep_control() 功能:蜂鳴器控制 調用:每10ms調用一次 =========================================================*/ __callt void Beep_control()//每10mS調用一次 { if (Beep_EN) { if (Beep.PWR_time) { PWR_CTRL=0;//供電 Beep.PWR_time--; } else { PWR_CTRL=1;//掉電,依靠電容放電實現和弦拖音 } if (Beep.FREQ_time) { Beep.FREQ_time--; CR000=Beep.CountFR; TOC00=0x03; //TMC00=0X0C;//啟動操作 } else { TOC00=0x02; //TMC00=0X00;//啟動操作 Beep_set(); PWR_CTRL=0;//發聲完畢，打開電源給電容充電 } } else { BUZZER_IO=0; TOC00=0x02; } return; }

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