微机原理及接口技术音乐发生器实验.doc

微机原理及接口技术音乐发生器实验发生器音乐发生器）） Y N N （图2.2.1） 符号－频率对照表： 音符 1 2 3 4 5 6 7 频率 131 147 165 175 196 220 247 音符 1 2 3 4 5 6 7 1（高） 频率 262 294 330 349 392 440 494 523 （3.2.1） 3.2.2音符的持续时间要根据乐曲的速度及每个音符的节拍数来确定。在4/4拍中，四分音符为1拍，每小节4拍，全音符持续4拍，二分音符持续2拍，四分音符持续1拍，八分音符持续半拍。如果给全音符分配1秒的时间，则二分音符的持续时间为0.5秒，四分音符的持续时间为0.25秒，八分音符的持续时间为0.125秒。 音符-延时对照表 音符 全音符 二分音符 四分音符 八分音符 时间 1760ms 880ms 440ms 220ms 倍数 32 16 8 4 3.2.3程序设计： sstack segment stack dw 200 dup(?) sstack ends data segment bg db Two tigers ... db 0ah,0dh db press any key to stop! ,0ah,0dh,$ freq dw 494,440,392,349,262,262,392, 440,392, 392,349 dw 494,440,392,349,262,262, 349, 349,330,262,220,262 dw 262,294,175,196,220,175, 175,196, 175,165, 175, 175 dw 175, 175,262,262,175,165,220,220,196,175,165 dw 175,394,175,196,220,175,220,247,220,175,131,165 dw 175,262,262,220,220,247262,247,220,175,196,220 dw 220,175,220,394,330,330,330,349,330,262,220,294,294 dw 175,220,349,330,330,349,392,392,349,349,392,440,392,392,349 dw 330,349,349,349,349,330,330,349,392,262,523,523,523 dw 131,440,392,440,392,392,349,392,392,392,440,349,330,349 dw 349,440,392,440,392,349,392,392,392,392,440,349,330,349 dw 349,440,392,440,392,349,392,440,494,523,523,494,440,392, 349 dw330,349,392,440,349,294,392,330,349,349,440,392,440,392,392,349, 392 dw392,440,349,330,349,349,440,440,349,392,440,494,523,523,523,494,349 dw 440,392,349,330,349,392,440,349,523,262,494,440,349,392,392,349 time dw 16,8,8,8,4,8,32,16,8,8,32 dw 16,8,8,8,4,4,8,8,8,16,16,24, dw 16,8,8,8,4,16,8,4,24,8,4,4,32 dw 16,8,8,8,4,8,32,16,8,8,32 dw 16,8,8,8,4,4,8,8,8,16,16,24 dw 16,16,8,4,16,8,4,4,8,4,4,32 dw 16,8,8,8,4,8,4,4,8,