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51中音乐的音调和节拍的确定
0750long | 2010-02-03 22:01:50    阅读:2757   发布文章

51中音乐的音调和节拍的确定

 

 一般说来,单片机演奏音乐基本都是单音频率,它不包含相应幅度的谐波频率,也就是说不能象电子琴那样能奏出多种音色的声音。因此单片机奏乐只需弄清楚两个概念即可,也就是“音调”和“节拍”。音调表示一个音符唱多高的频率,节拍表示一个音符唱多长的时间。
    1)音调的确定
       音调就是我们常说的音高。它是由频率来确定的!我们可以查出各个音符所对应的相应的频率,那么现在就需要我们来用51来发出相应频率的声音!
       我们常采用的方法就是通过单片机的定时器定时中断,将单片机上对应蜂鸣器的
I/O口来回取反,或者说来回清零,置位,从而让蜂鸣器发出声音,为了让单片机发出不同频率的声音,我们只需将定时器予置不同的定时值就可实现。那么怎样确定一个频率所对应的定时器的定时值呢?
以标准音高A为例:
       A的频率f = 440 Hz,其对应的周期为:T = 1/ f = 1/440 =2272μs
那么,单片机上对应蜂鸣器的I/O口来回取反的时间应为:
      t = T/2 = 2272/2 = 1136μs,也就是清零、置位在一个周期内完成.
      这个时间t也就是单片机上定时器应有的中断触发时间。一般情况下,单片机奏乐时,其定时器为工作方式1,它以振荡器的十二分频信号为计数脉冲。设振荡器频率为f0,则定时器的予置初值由下式来确定:
                 t = 12 *TALL – THL/ f0
式中TALL = 216 = 65536,THL为定时器待确定的计数初值。因此定时器的高低计数器的初值为:  
TH = THL / 256 = ( TALL – t* f0/12) / 256
 TL = THL % 256 = ( TALL – t* f0/12) %256
 t=1136μs代入上面两式(注意:计算时应将时间和频率的单位换算一致),即可求出标准音高A在单片机晶振频率f0=12Mhz,定时器在工作方式1下的定时器高低计数器的予置初值为
  TH440Hz = (65536 1136 * 12/12) /256 = FBH
 TL440Hz = (65536 1136 * 12/12)%256 = 90H
就这样,我们通过延时,发出了我们所需要的频率

以单片机12MHZ晶振为例,例出高中低音符与单片机计数T0相关的计数值如下表所示

音符

频率(HZ)

简谱码(T值)

 

音符

频率(HZ)

简谱码(T值)

低1 DO

262

63628

# 4 FA#

740

64860

#1 DO#

277

63731

中 5 SO

784

64898

低2 RE

294

63835

# 5 SO#

831

64934

#2 RE#

311

63928

中 6 LA

880

64968

低 3 M

330

64021

# 6

932

64994

低 4 FA

349

64103

中 7 SI

988

65030

# 4 FA#

370

64185

高 1 DO

1046

65058

低 5 SO

392

64260

# 1 DO#

1109

65085

# 5 SO#

415

64331

高 2 RE

1175

65110

低 6 LA

440

64400

 

# 2 RE#

1245

65134

# 6

466

64463

高 3 M

1318

65157

低 7 SI

494

64524

高 4 FA

1397

65178

中 1 DO

523

64580

# 4 FA#

1480

65198

# 1 DO#

554

64633

高 5 SO

1568

65217

中 2 RE

587

64684

# 5 SO#

1661

65235

# 2 RE#

622

64732

高 6 LA

1760

65252

中 3 M

659

64777

# 6

1865

65268

中 4 FA

698

64820

高 7 SI

1967

65283


         2)节拍的确定
             在一张乐谱中,我们经常会看到这样的表达式,如1=C (4/4) 、1=G(3/4) …… 等等,这里1=C (4/4),1=G(3/4)表示乐谱的曲调,和我们前面所谈的音调有很大的关联,4/4、3/4 就是用来表示节拍的。以3/4为例加以说明,它表示乐谱中以四分音符为节拍,每一小结有三拍。
               例如:    
其中1 2 为一拍,345为一拍,6为一拍共三拍。1 2的时长为四分音符的一半,即为八分音符长,34的时长为八分音符的一半,即为十六分音符长,5的时长为四分音符的一半,即为八分音符长,6的时长为四分音符长。
    一般说来,如果乐曲没有特殊说明,一拍的时长大约为400—500ms
    可见,在单片机上控制一个音符唱多长可采用循环延时的方法来实现。首先,我们确定一个基本时长的延时程序,比如说以十六分音符的时长为基本延时时间,那么,对于一个音符,如果它为十六分音符,则只需调用一次延时程序,如果它为八分音符,则只需调用二次延时程序,如果它为四分音符,则只需调用四次延时程序,依次类推。

下面我们要为这个音符建立一个表格,有助于单片机通过查表的方式来获得相应的数据

低音0-19之间,中音在20-39之间,高音在40-59之间

TABLE:        DW 0,63628,63835,64021,64103,64260,64400,64524,0,0

                   DW 0,63731,63928,0,64185,64331,64463,0,0,0

                   DW 0,64580,64684,64777,64820,64898,64968,65030,0,0

                   DW 0,64633,64732,0,64860,64934,64994,0,0,0

                   DW 0,65058,65110,65157,65178,65217,65252,65283,0,0

                   DW 0,65085,65134,0,65198,65235,65268,0,0,0

                   DW 0

 

 音乐的音拍,一个节拍为单位(C调)

曲调值

DELAY

 

曲调值

DELAY

调4/4

125ms

 

调4/4

62ms

调3/4

187ms

 

调3/4

94ms

调2/4

250ms

 

调2/4

125ms

    通过上面关于一个音符音调和节拍的确定方法,我们就可以在单片机上实现演奏音乐了。具体的实现方法为:将乐谱中的每个音符的音调及节拍变换成相应的音调参数和节拍参数,将他们做成数据表格,存放在存储器中,通过程序取出一个音符的相关参数,播放该音符,该音符唱完后,接着取出下一个音符的相关参数……,如此直到播放完毕最后一个音符,根据需要也可循环不停地播放整个乐曲。另外,对于乐曲中的休止符,一般将其音调参数设为FFHFFH,其节拍参数与其他音符的节拍参数确定方法一致,乐曲结束用节拍参数为00H来表示。

附上:
//挥着翅膀的女孩  
unsigned char code Music_Girl[]={ 0x17,0x02, 0x17,0x03, 0x18,0x03, 0x19,0x02, 0x15,0x03,
                                  0x16,0x03, 0x17,0x03, 0x17,0x03, 0x17,0x03, 0x18,0x03,
                                  0x19,0x02, 0x16,0x03, 0x17,0x03, 0x18,0x02, 0x18,0x03,
                                  0x17,0x03, 0x15,0x02, 0x18,0x03, 0x17,0x03, 0x18,0x02,
                                  0x10,0x03, 0x15,0x03, 0x16,0x02, 0x15,0x03, 0x16,0x03,
                                  0x17,0x02, 0x17,0x03, 0x18,0x03, 0x19,0x02, 0x1A,0x03,
                                  0x1B,0x03, 0x1F,0x03, 0x1F,0x03, 0x17,0x03, 0x18,0x03,
                                  0x19,0x02, 0x16,0x03, 0x17,0x03, 0x18,0x03, 0x17,0x03,
                                  0x18,0x03, 0x1F,0x03, 0x1F,0x02, 0x16,0x03, 0x17,0x03,
                                  0x18,0x03, 0x17,0x03, 0x18,0x03, 0x20,0x03, 0x20,0x02,
                                  0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x20,0x03, 0x21,0x03,
                                  0x20,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x1F,0x03,
                                  0x1B,0x03, 0x19,0x03, 0x19,0x03, 0x15,0x03, 0x1A,0x66,
                                  0x1A,0x03, 0x19,0x03, 0x15,0x03, 0x15,0x03, 0x17,0x03,
                                  0x16,0x66, 0x17,0x04, 0x18,0x04, 0x18,0x03, 0x19,0x03,
                                  0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x20,0x03, 0x21,0x03,
                                  0x20,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66, 0x1F,0x03,
                                  0x1B,0x03, 0x19,0x03, 0x19,0x03, 0x15,0x03, 0x1A,0x66,
                                  0x1A,0x03, 0x19,0x03, 0x19,0x03, 0x1F,0x03, 0x1B,0x03,
                                  0x1F,0x00, 0x1A,0x03, 0x1A,0x03, 0x1A,0x03, 0x1B,0x03,
                                  0x1B,0x03, 0x1A,0x03, 0x19,0x03, 0x19,0x02, 0x17,0x03,
                                  0x15,0x17, 0x15,0x03, 0x16,0x03, 0x17,0x03, 0x18,0x03,
                                  0x17,0x04, 0x18,0x0E, 0x18,0x03, 0x17,0x04, 0x18,0x0E,
                                  0x18,0x66, 0x17,0x03, 0x18,0x03, 0x17,0x03, 0x18,0x03,
                                  0x20,0x03, 0x20,0x02, 0x1F,0x03, 0x1B,0x03, 0x1F,0x66,
                                  0x20,0x03, 0x21,0x03, 0x20,0x03, 0x1F,0x03, 0x1B,0x03,
                                  0x1F,0x66, 0x1F,0x04, 0x1B,0x0E, 0x1B,0x03, 0x19,0x03,
                                  0x19,0x03, 0x15,0x03, 0x1A,0x66, 0x1A,0x03, 0x19,0x03,
                                  0x15,0x03, 0x15,0x03, 0x17,0x03, 0x16,0x66, 0x17,0x04,
                                  0x18,0x04, 0x18,0x03, 0x19,0x03, 0x1F,0x03, 0x1B,0x03,
                                  0x1F,0x66, 0x20,0x03, 0x21,0x03, 0x20,0x03, 0x1F,0x03,
                                  0x1B,0x03, 0x1F,0x66, 0x1F,0x03, 0x1B,0x03, 0x19,0x03,
                                  0x19,0x03, 0x15,0x03, 0x1A,0x66, 0x1A,0x03, 0x19,0x03,
                                  0x19,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x00, 0x18,0x02,
                                  0x18,0x03, 0x1A,0x03, 0x19,0x0D, 0x15,0x03, 0x15,0x02,
                                  0x18,0x66, 0x16,0x02, 0x17,0x02, 0x15,0x00, 0x00,0x00};
//同一首歌
unsigned char code Music_Same[]={ 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x66, 0x18,0x03,
                                  0x17,0x02, 0x15,0x02, 0x16,0x01, 0x15,0x02, 0x10,0x02,
                                  0x15,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x02,
                                  0x17,0x03, 0x18,0x03, 0x19,0x02, 0x15,0x02, 0x18,0x66,
                                  0x17,0x03, 0x19,0x02, 0x16,0x03, 0x17,0x03, 0x16,0x00,
                                  0x17,0x01, 0x19,0x02, 0x1B,0x02, 0x1B,0x70, 0x1A,0x03,
                                  0x1A,0x01, 0x19,0x02, 0x19,0x03, 0x1A,0x03, 0x1B,0x02,
                                  0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x18,0x66, 0x18,0x03,
                                  0x19,0x02, 0x1A,0x02, 0x19,0x0C, 0x18,0x0D, 0x17,0x03,
                                  0x16,0x01, 0x11,0x02, 0x11,0x03, 0x10,0x03, 0x0F,0x0C,
                                  0x10,0x02, 0x15,0x00, 0x1F,0x01, 0x1A,0x01, 0x18,0x66,
                                  0x19,0x03, 0x1A,0x01, 0x1B,0x02, 0x1B,0x03, 0x1B,0x03,
                                  0x1B,0x0C, 0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x1F,0x01,
                                  0x1A,0x01, 0x18,0x66, 0x19,0x03, 0x1A,0x01, 0x10,0x02,
                                  0x10,0x03, 0x10,0x03, 0x1A,0x0C, 0x18,0x0D, 0x17,0x03,
                                  0x16,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x70,
                                  0x18,0x03, 0x17,0x02, 0x15,0x03, 0x15,0x03, 0x16,0x66,
                                  0x16,0x03, 0x16,0x02, 0x16,0x03, 0x15,0x03, 0x10,0x02,
                                  0x10,0x01, 0x11,0x01, 0x11,0x66, 0x10,0x03, 0x0F,0x0C,
                                  0x1A,0x02, 0x19,0x02, 0x16,0x03, 0x16,0x03, 0x18,0x66,
                                  0x18,0x03, 0x18,0x02, 0x17,0x03, 0x16,0x03, 0x19,0x00,
                                  0x00,0x00 };
//两只蝴蝶                                 
unsigned char code Music_Two[] ={ 0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
                                  0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
                                  0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
                                  0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x16,0x03,
                                  0x17,0x01, 0x16,0x03, 0x17,0x03, 0x16,0x03, 0x15,0x01,
                                  0x10,0x03, 0x15,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
                                  0x16,0x03, 0x15,0x03, 0x10,0x03, 0x15,0x03, 0x16,0x01,
                                  0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
                                  0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
                                  0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
                                  0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x19,0x03,
                                  0x19,0x01, 0x19,0x03, 0x1A,0x03, 0x19,0x03, 0x17,0x01,
                                  0x16,0x03, 0x16,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
                                  0x16,0x03, 0x15,0x03, 0x10,0x03, 0x10,0x0D, 0x15,0x00,
                                  0x19,0x03, 0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03,
                                  0x1B,0x03, 0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03,
                                  0x16,0x0D, 0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03,
                                  0x1A,0x02, 0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03,
                                  0x16,0x01, 0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03,
                                  0x19,0x02, 0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E,
                                  0x1B,0x04, 0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E,
                                  0x1B,0x04, 0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03,
                                  0x17,0x0D, 0x16,0x03, 0x17,0x03, 0x19,0x01, 0x19,0x03,
                                  0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03, 0x1B,0x03,
                                  0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03, 0x16,0x03,
                                  0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03, 0x1A,0x02,
                                  0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x01,
                                  0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03, 0x19,0x03,
                                  0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
                                  0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
                                  0x17,0x16, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
                                  0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03, 0x0F,0x02,
                                  0x10,0x03, 0x15,0x00, 0x00,0x00 };

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