聲音:是由物體振動所發出來的。
那麼,一個物體的振動有振動頻率與振動幅度與振動強度等有關。
振動頻率就是每秒振動多少次
振動幅度就是振動一次所產生的距離
振動強度就是振動一次的力量有多強
振動材料的不同,發出的基準音也不同,比如用力敲打桌子,隨着力度的變動,聲音的大小會隨之變動,但音色沒有變,你經經的敲打一下,和重重的敲打一下,聲音的大小不同,但還是能聽出來是敲打桌子的聲音,理論上,經經的敲,振動頻率低,振動幅度也小,振動強度經,重重的敲則這3條線隨之變大,而音色沒有變,所以我猜想,振動頻率與振動幅度之比決定音色,這兩個值越大,也就是振動強度越強,聲音也越大,當然,用什麼東西敲打桌子,聲音是不同的,因爲除了桌子在發聲外,所敲打的物體也在發聲,那麼我們聽到的聲音則是這兩種物體的混合聲音。
但如果有一種材料,可以改變振動頻率而不改變振動幅度,或者改變振動幅度而不改變振動頻率,那是不是就可以發現各種不同的聲音了呢?我想答案是肯定的,比如現代的耳機,裏面就一塊很薄的膜,中間有兩根銅絲穿過去,還有磁鐵什麼的,可以看到有電流,有磁場,就可以利用電流的強弱與磁場的強弱來控制這塊膜做不同頻率與幅度的振動來發出各種聲音了。
查資料解釋:所謂音色,也就是振動頻率中混有的其他更高頻率的小振幅比例、頻率不同,揚聲器只要把所有頻率(基頻和泛音頻率)都播放出來,就有了各種聲音
男生女生區分,那麼在同等音量大小的情況下,男生語音,與女生語音,發音的結構完全一樣,音色完全不同,是怎麼回事呢?
我猜想,就是因爲材料不一樣,首先,由於每個人聲帶的長短,厚度,粗細,平滑度有關,所以每個人講的話都不相同,但男女聲音最主要的區別,可能是振動的頻率不一樣,在相同振幅的情況下,振動頻率的不同決定音色的大方向的不同,聲帶的不同決定的小範圍音色不同,以上是我的推理罷了。
振動頻率範圍
https://blog.csdn.net/brandon2015/article/details/50426137
人耳正常聽覺範圍:20~20khz,超過20khz稱爲超聲波,人耳分辯不出來了
錄音設備,採樣率,也就是每秒採集多少個聲音樣本,1個樣本爲1或2字節,採樣率越高就越接近真實的聲音,但採樣率達到人耳能聽到的20khz的兩倍以上就可以了,所以CD音質是44.1khz也是有原因的,最大也就48khz的音頻數據完全夠了,超出就是一種倒退。
一般的錄音軟件要支持11khz,22khz,44khz等
8khz,不知道效果如何
11.025khz的採樣率獲得的聲音稱爲電話音質,能分辯出通話人是誰
22.05khz爲廣播音質
44.1khz及以上爲CD音質
樣品數據:那麼在採集某時間點的樣品時,是採集的頻率數據呢,還是採集到的振幅數據呢?我想,頻率數據在任何一個時間點,是採集不到的,所以唯一能採集到的就是振幅數據了,也就是採集點的振動幅度的強弱,而振動的強弱又是電壓的大小來決定的,所以最終採集到的數據是某時刻的電壓值,把這一連串的電壓值按順序保存起來,就成爲原始聲音文件了,比如WAV。
單片機播放聲音:我們知道,單片機的端口只有兩種狀態,以5V爲例,要麼是5V,要麼是0V,那如何把單片機的端口電壓變成0~5V之間的電壓值呢?比如採樣率爲44.1khz,說明1秒內要播放44100個樣品,比如採用8位來保存1個樣品,那麼某樣品數爲0xa0,我們可以做個計數器,計數256次,如果計數器小於0xa0則爲低電平,否則爲高電平通過端口快速的變動從而產生出某個採樣點的電壓值與採樣數據相批配,喇叭的兩根線,一根接此端口上,另一根接VCC或GND都可以,這樣就能還原出這個樣品的電壓值,比如單片機晶振爲30兆,需要播放44.1Khz的聲音,那麼30000000/44100=680,那麼做個定時器,每680時鐘週期中斷1次,輸入採樣率,利用單片機的PCA模塊,實現端口PWM波形輸出,這樣就可以播放wav格式的聲音。
參考資料:http://www.znmcu.cn/znx_51_iap_exps_pca_pwm_test.html
代碼:STC15W4K32S4單片機,播放聲音端口爲P3.5,另一端口爲VCC或GND都可以
#include <STC/stc15.h>
#include <intrins.h>
#define CCP_S0 0x10 //P_SW1.4
#define CCP_S1 0x20 //P_SW1.5
typedef char I8;
typedef int I16;
typedef long I32;
typedef unsigned char U8;
typedef unsigned int U16;
typedef unsigned long int U32;
typedef volatile char V8;
typedef volatile int V16;
typedef volatile long V32;
typedef volatile unsigned char VU8;
typedef volatile unsigned int VU16;
typedef volatile unsigned long VU32;
//8K採樣率,聲音內容爲“你好”
unsigned char code wavdat[3696] = {
0x0E, 0x00, 0x00, 0x5E, 0x41, 0x45, 0x47, 0x5B, 0x58, 0x59, 0x59, 0x5F, 0x5C, 0x52, 0x51, 0x57,
0xD4, 0xD4, 0xD6, 0xD0, 0xDD, 0xDF, 0xDF, 0xDB, 0xDA, 0xC5, 0xDA, 0xDA, 0xD8, 0xDD, 0xDC, 0xD0,
0xD4, 0xD5, 0x56, 0x5F, 0x5F, 0x5A, 0x41, 0x43, 0x4F, 0x48, 0x4A, 0x4A, 0x4B, 0x4B, 0x4B, 0x48,
0x48, 0x4A, 0x49, 0x4E, 0x4D, 0x47, 0x44, 0x5B, 0x5C, 0x5F, 0x52, 0x54, 0x55, 0xD6, 0xDC, 0xD9,
0xC5, 0xC0, 0xCC, 0xCE, 0xCB, 0xF5, 0xF7, 0xF4, 0xF4, 0xF7, 0xF4, 0xF5, 0xCB, 0xCF, 0xC2, 0xC5,
0xDF, 0xD1, 0xD7, 0x53, 0x5C, 0x45, 0x40, 0x48, 0x77, 0x70, 0x72, 0x7D, 0x7D, 0x7D, 0x73, 0x7B,
0x7F, 0x72, 0x72, 0x4A, 0x4C, 0x52, 0x56, 0xDD, 0xCD, 0xC3, 0xC7, 0xC9, 0xCF, 0xC1, 0xC0, 0xC7,
0xCD, 0xC6, 0xC0, 0xC1, 0xF5, 0xC8, 0xC8, 0xF2, 0xF4, 0xFF, 0xF0, 0xF3, 0xF6, 0xF0, 0xCA, 0xC4,
0xDB, 0xD7, 0x5C, 0x4A, 0x73, 0x71, 0x64, 0x67, 0x66, 0x66, 0x66, 0x64, 0x7F, 0x7D, 0x71, 0x48,
0x5B, 0x5B, 0x57, 0xD4, 0xD0, 0xD3, 0xDE, 0xDE, 0xD3, 0xD6, 0xDD, 0xD5, 0x50, 0xD1, 0xD9, 0xC7,
0xCF, 0xF6, 0xF2, 0xFD, 0xF8, 0xFE, 0xFB, 0xFC, 0xFD, 0xF3, 0xFD, 0xF7, 0xCF, 0xF7, 0xDD, 0xD9,
0xDE, 0xD7, 0x56, 0x58, 0x40, 0x74, 0x74, 0x7B, 0x7E, 0x64, 0x65, 0x7A, 0x7A, 0x7C, 0x7D, 0x70,
0x49, 0x4A, 0x46, 0x5F, 0x56, 0x57, 0xD2, 0xD2, 0xD1, 0xD6, 0xD1, 0xD4, 0x54, 0xD5, 0xD3, 0xDC,
0xCC, 0xCE, 0xF6, 0xF3, 0xF0, 0xFE, 0xF2, 0xFC, 0xFF, 0xF2, 0xF3, 0xFC, 0xF0, 0xF3, 0xC8, 0xF5,
0xC8, 0xD8, 0xCE, 0xD3, 0x58, 0x53, 0x77, 0x74, 0x7B, 0x78, 0x65, 0x65, 0x64, 0x7C, 0x7B, 0x70,
0x71, 0x75, 0x41, 0x45, 0x50, 0xD4, 0xD5, 0xD8, 0xD6, 0xDD, 0xD6, 0x54, 0xD7, 0x5F, 0xD4, 0xD6,
0xD8, 0xC6, 0xCE, 0xF5, 0xF1, 0xF5, 0xFD, 0xF6, 0xFF, 0xFA, 0xF0, 0xE7, 0xF8, 0xE4, 0xE4, 0xF0,
0xE7, 0xFD, 0xF2, 0xFF, 0xCC, 0xDE, 0x48, 0x50, 0x64, 0x64, 0x63, 0x63, 0x62, 0x6D, 0x64, 0x67,
0x7A, 0x7E, 0x71, 0x74, 0x43, 0x54, 0xD4, 0xD6, 0xD9, 0xDE, 0xD1, 0x55, 0x51, 0x41, 0x44, 0x4F,
0x47, 0x5C, 0x57, 0xD2, 0xD8, 0xC7, 0xF4, 0xF5, 0xFF, 0xFA, 0xE4, 0xE5, 0xE6, 0xE7, 0xE4, 0xE0,
0xF0, 0xE6, 0xF6, 0xFB, 0xF1, 0xCB, 0xF7, 0xD7, 0x4C, 0x43, 0x72, 0x6D, 0x7A, 0x6D, 0x63, 0x63,
0x60, 0x78, 0x61, 0x65, 0x77, 0x7E, 0x41, 0x45, 0xD7, 0xDC, 0xD0, 0xDB, 0xD5, 0x55, 0x53, 0x4D,
0x42, 0x5B, 0x43, 0x53, 0x50, 0xD7, 0xDA, 0xDF, 0xCB, 0xCB, 0xF1, 0xF8, 0xFE, 0xE4, 0xE1, 0xE5,
0xE7, 0xE6, 0xFE, 0xFB, 0xE5, 0xFC, 0xE5, 0xFB, 0xF5, 0xFE, 0x54, 0x49, 0xD6, 0x6D, 0x7E, 0x62,
0x6C, 0x61, 0x69, 0x64, 0x61, 0x64, 0x7B, 0x73, 0x73, 0x5E, 0x43, 0xD4, 0xD7, 0x5C, 0xC2, 0x4F,
0x5D, 0x4C, 0x72, 0x4A, 0x7F, 0x74, 0x40, 0x4E, 0x51, 0x54, 0xD1, 0xC4, 0xC2, 0xF4, 0xF0, 0xF0,
0xE4, 0xFA, 0xE5, 0xE6, 0xE6, 0xE5, 0xE1, 0xE4, 0xE6, 0xE7, 0xE3, 0xFB, 0xFC, 0xD2, 0x5B, 0xD0,
0x15, 0x77, 0x15, 0x62, 0x14, 0x6E, 0x66, 0x69, 0x78, 0x7A, 0x4B, 0x73, 0xC7, 0x50, 0xC3, 0xC4,
0xC3, 0xDC, 0x5F, 0xD5, 0x71, 0x7F, 0x73, 0x67, 0x72, 0x72, 0x76, 0x43, 0x5A, 0xD5, 0xD8, 0xC3,
0xF2, 0xFC, 0xFE, 0xE7, 0xE4, 0xE0, 0xE6, 0xE5, 0xE1, 0xFA, 0xE4, 0xE7, 0xE5, 0xE2, 0xE6, 0xF0,
0xFB, 0x74, 0xF3, 0x64, 0x66, 0x74, 0x6A, 0x7E, 0x6B, 0x64, 0x61, 0x66, 0x79, 0x7C, 0x7E, 0xD7,
0x45, 0xD2, 0xCD, 0xD1, 0xCD, 0xD6, 0xD5, 0x59, 0x71, 0x48, 0x73, 0x7C, 0x40, 0x70, 0x44, 0x59,
0x56, 0xDE, 0xDC, 0xF4, 0xCF, 0xFC, 0xE5, 0xE7, 0xE7, 0xE0, 0xE6, 0xE0, 0xE1, 0xE1, 0xED, 0xE4,
0xEE, 0xE3, 0xF2, 0xF1, 0xD0, 0xCE, 0x62, 0x71, 0x67, 0x69, 0x66, 0x69, 0x67, 0x60, 0x7A, 0x7F,
0x79, 0x46, 0x47, 0x55, 0xC6, 0xD1, 0xCC, 0xD1, 0xDD, 0x53, 0x46, 0x72, 0x74, 0x7B, 0x7D, 0x70,
0x77, 0x4F, 0x5C, 0x57, 0xDD, 0xC6, 0xCC, 0xF7, 0xFC, 0xFE, 0xE6, 0xE4, 0xE1, 0xED, 0xFA, 0xE3,
0xE1, 0xE1, 0xE0, 0xE2, 0xFC, 0xFB, 0x5D, 0xF1, 0x4F, 0x62, 0x5C, 0x15, 0x67, 0x6C, 0x6D, 0x67,
0x60, 0x73, 0x7F, 0x7D, 0x45, 0xD7, 0x57, 0xCC, 0xC6, 0xC6, 0xDA, 0x55, 0xD4, 0x71, 0x4E, 0x7D,
0x65, 0x76, 0x7C, 0x76, 0x47, 0x45, 0xD5, 0xD0, 0xCD, 0xCE, 0xF1, 0xFB, 0xFA, 0xE5, 0xE1, 0xE6,
0xE3, 0xE6, 0xED, 0xE3, 0xE2, 0xE1, 0xF9, 0xC2, 0xF0, 0x59, 0x65, 0x56, 0x6F, 0x65, 0x6C, 0x63,
0x66, 0x62, 0x70, 0x79, 0x76, 0x58, 0x47, 0xC4, 0xC2, 0xC2, 0xF4, 0xCE, 0xCC, 0xDF, 0xD7, 0x77,
0x76, 0x79, 0x79, 0x78, 0x73, 0x75, 0x4D, 0x59, 0x53, 0xC5, 0xDB, 0xF5, 0xFD, 0xF0, 0xE5, 0xE1,
0xE6, 0xE0, 0xE2, 0xED, 0xE3, 0xE2, 0xE7, 0xF4, 0xC6, 0xFE, 0x78, 0x76, 0x76, 0x6C, 0x66, 0x6B,
0x65, 0x6F, 0x64, 0x71, 0x7F, 0x4E, 0xD2, 0xDF, 0xD8, 0xE5, 0xC0, 0xFF, 0xF0, 0xF5, 0xC3, 0x57,
0xD1, 0x71, 0x77, 0x4A, 0x72, 0x49, 0x4F, 0x5F, 0x5C, 0xC5, 0xC6, 0xC6, 0xF7, 0xF2, 0xFC, 0xF3,
0xE1, 0xFA, 0xE2, 0xE1, 0xE2, 0xE4, 0xF6, 0xD8, 0xF1, 0x4B, 0x78, 0x41, 0x6C, 0x64, 0x6C, 0x61,
0x61, 0x60, 0x76, 0x73, 0x4C, 0x54, 0xDB, 0xD9, 0xCA, 0xFD, 0xCE, 0xF1, 0xCA, 0xF4, 0xD6, 0xD8,
0x58, 0x48, 0xD5, 0x75, 0x43, 0x52, 0x5D, 0xD7, 0xD9, 0xC9, 0xCD, 0xF4, 0xF1, 0xFD, 0xF6, 0xE5,
0xE5, 0xFE, 0xE0, 0xF9, 0xCB, 0x50, 0xF9, 0x7E, 0x7A, 0x5B, 0x6E, 0x79, 0x69, 0x64, 0x62, 0x62,
0x75, 0x78, 0x74, 0x5F, 0xD4, 0xCC, 0xCB, 0xC8, 0xF3, 0xCB, 0xF4, 0xF4, 0xD3, 0xC5, 0x5D, 0x5F,
0x54, 0x43, 0xDD, 0xD5, 0xC6, 0xC5, 0xC2, 0xFD, 0xF7, 0xF3, 0xFF, 0xF3, 0xF8, 0xE5, 0xF9, 0xFB,
0xCC, 0xC4, 0x49, 0xC3, 0x62, 0x66, 0x7E, 0x14, 0x67, 0x15, 0x65, 0x62, 0x61, 0x48, 0x7D, 0x49,
0xD4, 0xC5, 0xD2, 0xF4, 0xC4, 0xC5, 0xD6, 0xDA, 0x54, 0x48, 0xDD, 0x75, 0x48, 0xC4, 0x5E, 0xC7,
0xF5, 0xF2, 0xFC, 0xF8, 0xE6, 0xE4, 0xE6, 0xE7, 0xE3, 0xFA, 0xEF, 0xF7, 0xF9, 0x40, 0x49, 0xF7,
0x10, 0x75, 0x6F, 0x14, 0x60, 0x16, 0x72, 0x15, 0x78, 0x49, 0x76, 0x52, 0xC5, 0xCB, 0xC4, 0xE5,
0xDA, 0xF2, 0xD5, 0xF4, 0x59, 0x4D, 0x53, 0x72, 0x4D, 0x53, 0x40, 0xCD, 0xCE, 0xFF, 0xF9, 0xE2,
0xE0, 0xE2, 0xED, 0xE2, 0xE2, 0xE1, 0xE4, 0xE4, 0x4B, 0x47, 0xF9, 0x1C, 0x58, 0x68, 0x15, 0x61,
0x11, 0x4A, 0x68, 0x70, 0xD3, 0x42, 0xDF, 0xCE, 0xFB, 0xC7, 0xFC, 0xD8, 0xC9, 0x4F, 0xD8, 0x4E,
0x79, 0x40, 0x7B, 0x75, 0x70, 0xD5, 0xD9, 0xC0, 0xE3, 0xE1, 0xEC, 0xEE, 0xE9, 0xEA, 0xEC, 0xEA,
0xFC, 0xEC, 0x71, 0x71, 0xFF, 0x1E, 0x67, 0x6F, 0x13, 0x6D, 0x16, 0x41, 0x63, 0x42, 0xF0, 0xCA,
0xFD, 0xEC, 0xE1, 0xE7, 0xE2, 0xF4, 0xF3, 0x54, 0xD1, 0x71, 0x65, 0x71, 0x67, 0x7B, 0x70, 0x4A,
0xDC, 0xF3, 0xF8, 0xE9, 0xE9, 0xEB, 0x94, 0xEA, 0x94, 0xEE, 0xF8, 0xEE, 0x7B, 0x61, 0xF7, 0x05,
0x69, 0x16, 0x1F, 0x6B, 0x13, 0x71, 0x63, 0x51, 0xF9, 0xE6, 0xFA, 0x96, 0xEA, 0xE7, 0x97, 0xCD,
0xE5, 0x4B, 0x5C, 0x7C, 0x6D, 0x78, 0x60, 0x64, 0x74, 0x4C, 0xDA, 0xE4, 0xE0, 0xE9, 0x96, 0x94,
0x91, 0x97, 0xEB, 0xEB, 0xC1, 0xE4, 0x16, 0x64, 0x7A, 0x01, 0x69, 0x18, 0x1D, 0x11, 0x14, 0x46,
0x64, 0xE4, 0xE1, 0x95, 0xE1, 0x9E, 0xE3, 0xE0, 0xE8, 0x4B, 0xCB, 0x66, 0x7C, 0x6C, 0x62, 0x60,
0x67, 0x7C, 0xDE, 0xCD, 0xE3, 0x95, 0x97, 0x92, 0x92, 0x91, 0x92, 0xE8, 0xEB, 0xE4, 0x5C, 0xF0,
0x1D, 0x14, 0x71, 0x02, 0x16, 0x12, 0x1E, 0x14, 0x66, 0x41, 0x5E, 0xEF, 0xE1, 0x96, 0xEC, 0x95,
0xE0, 0xC6, 0xC0, 0x71, 0x79, 0x6E, 0x7D, 0x69, 0x64, 0x79, 0x71, 0xD1, 0xDE, 0xE1, 0xEE, 0xEA,
0x96, 0x90, 0x97, 0xEB, 0xEA, 0xED, 0xF8, 0xE5, 0xD9, 0x55, 0x63, 0x13, 0xC3, 0x18, 0x1C, 0x66,
0x11, 0x67, 0x79, 0xC7, 0x54, 0xE1, 0xE5, 0xE1, 0xF1, 0xE6, 0x50, 0x7F, 0x49, 0x6D, 0x65, 0x6D,
0x72, 0x4F, 0x42, 0x53, 0xC0, 0xCB, 0xE5, 0xF3, 0xEC, 0xE1, 0xE0, 0xEC, 0xE4, 0xF7, 0xE6, 0xC1,
0xC8, 0xFA, 0xFC, 0xE1, 0xDA, 0x72, 0x67, 0xF5, 0x10, 0x17, 0x79, 0x17, 0x7C, 0x7C, 0x75, 0x52,
0xFD, 0xF6, 0xC1, 0xFA, 0xC4, 0xD2, 0x64, 0x5A, 0x70, 0x7C, 0x46, 0x72, 0xDC, 0x45, 0x53, 0x4F,
0xD5, 0x50, 0xC7, 0xF5, 0xC9, 0xE5, 0xF1, 0xF8, 0xF6, 0xF5, 0xFD, 0xFC, 0xE7, 0xEC, 0xE8, 0x95,
0xF3, 0x6A, 0x5A, 0x7D, 0x19, 0x10, 0x11, 0x16, 0x6C, 0x65, 0x7D, 0xC1, 0xE5, 0xE7, 0xE7, 0xE4,
0xFE, 0xFD, 0x4F, 0x64, 0x5C, 0x48, 0x65, 0x7F, 0x5F, 0x4B, 0x7F, 0x74, 0xD7, 0x48, 0xC9, 0xE5,
0xC7, 0xFA, 0xFA, 0xFA, 0xC3, 0xF7, 0xE4, 0xE2, 0xE4, 0xEA, 0x94, 0x95, 0x95, 0xF0, 0x18, 0x6C,
0x63, 0x06, 0x18, 0x1A, 0x6F, 0x73, 0x4F, 0xC9, 0x95, 0x96, 0x96, 0xE8, 0xF3, 0x5D, 0x44, 0x7F,
0x14, 0x6E, 0x72, 0x66, 0x7A, 0x77, 0x41, 0x4A, 0x71, 0xF9, 0xC9, 0xFA, 0xEF, 0xE1, 0xFA, 0xE0,
0xFD, 0xC9, 0xC7, 0xCE, 0xE1, 0xE0, 0xFC, 0xE6, 0xE6, 0xE6, 0xF5, 0xC4, 0x0D, 0x69, 0x6E, 0x05,
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0xE4, 0xF8, 0xFF, 0xF6, 0xF6, 0xF6, 0xF5, 0xF7, 0xFC, 0xF7, 0xF7, 0x42, 0x6C, 0x14, 0x17, 0x62,
0x45, 0xF8, 0xE3, 0xEC, 0xF8, 0x56, 0x70, 0x66, 0x60, 0x7B, 0x4B, 0x54, 0xCA, 0xF6, 0xF7, 0xF4,
0xDF, 0x59, 0x75, 0x71, 0x75, 0x52, 0xDC, 0xC1, 0xD9, 0xD7, 0x56, 0x5B, 0x51, 0xDC, 0xD0, 0x51,
0x47, 0x4E, 0x46, 0x56, 0xDE, 0xCE, 0xCA, 0xF4, 0xF6, 0xF0, 0xFD, 0xFF, 0xF1, 0xF6, 0xF5, 0xCB,
0xF4, 0xC2, 0xF1, 0xCC, 0xCB, 0xD2, 0x72, 0x6B, 0x17, 0x17, 0x63, 0x54, 0xF8, 0xED, 0xE0, 0xF3,
0x5F, 0x7D, 0x67, 0x66, 0x7E, 0x48, 0xD5, 0xF5, 0xF0, 0xF1, 0xCD, 0xD3, 0x48, 0x77, 0x7C, 0x4E,
0x57, 0xC4, 0xCC, 0xD3, 0x54, 0x5E, 0x58, 0x54, 0xD0, 0x54, 0x5F, 0x46, 0x42, 0x5D, 0xDD, 0xDA,
0xC0, 0xCD, 0xC2, 0xCB, 0xF7, 0xFF, 0xFE, 0xFD, 0xF4, 0xC1, 0xCD, 0xC3, 0xF7, 0xF4, 0xF7, 0xC8,
0xD0, 0x7B, 0x15, 0x17, 0x16, 0x66, 0x56, 0xFB, 0xE3, 0xE6, 0xF1, 0x47, 0x7D, 0x66, 0x66, 0x79,
0x77, 0xD5, 0xC9, 0xF6, 0xF2, 0xF4, 0xDC, 0x4D, 0x7D, 0x7F, 0x4A, 0x51, 0xC0, 0xC8, 0xD9, 0xD6,
0x5E, 0x56, 0x57, 0xD6, 0x53, 0x59, 0x43, 0x45, 0xD2, 0xC7, 0xC8, 0xC9, 0xC8, 0xF5, 0xF7, 0xF2,
0xF2, 0xF2, 0xF0, 0xF6, 0xCA, 0xF6, 0xCB, 0xF1, 0xF1, 0xF7, 0xF5, 0xD1, 0x4D, 0x60, 0x6F, 0x69,
0x66, 0x5B, 0xF6, 0xE1, 0xE1, 0xFC, 0xDE, 0x4B, 0x7E, 0x65, 0x7C, 0x75, 0x57, 0xC5, 0xF5, 0xF4,
0xC8, 0xD0, 0x4E, 0x71, 0x7D, 0x4E, 0x50, 0xC5, 0xCE, 0xDA, 0xD5, 0x5C, 0x52, 0x50, 0x54, 0x50,
0x5B, 0x47, 0x58, 0xDF, 0xC6, 0xF5, 0xF4, 0xCF, 0xCD, 0xCD, 0xF7, 0xF0, 0xFC, 0xF7, 0xC9, 0xC7,
0xDC, 0xC9, 0xCF, 0xF7, 0xCD, 0xDE, 0x5F, 0x73, 0x61, 0x6F, 0x6D, 0x61, 0x4C, 0xC5, 0xF2, 0xFE,
0xF7, 0xD9, 0x40, 0x74, 0x7F, 0x73, 0x74, 0x47, 0xD1, 0xDE, 0xCB, 0xC7, 0xD1, 0x40, 0x77, 0x77,
0x4D, 0x55, 0xDC, 0xD8, 0xD5, 0x50, 0x5E, 0x5D, 0x55, 0xD5, 0x51, 0x59, 0x5E, 0x5D, 0xD2, 0xC5,
0xC3, 0xCC, 0xCC, 0xCB, 0xCA, 0xF1, 0xF6, 0xF1, 0xF4, 0xC2, 0xC8, 0xC6, 0xC1, 0xD8, 0xC4, 0xD9,
0xDC, 0xD0, 0x5C, 0x4F, 0x78, 0x64, 0x67, 0x7F, 0x4A, 0x5F, 0xD3, 0xD9, 0xD9, 0xD7, 0x5D, 0x42,
0x75, 0x76, 0x75, 0x40, 0x52, 0xD3, 0xD0, 0xD6, 0x47, 0x4F, 0x75, 0x44, 0xD6, 0xD8, 0xC0, 0xDF,
0x54, 0x5C, 0x5D, 0xD6, 0xD2, 0xD2, 0xD6, 0x54, 0x54, 0xD0, 0xDB, 0xC2, 0xC2, 0xC5, 0xDB, 0xC6,
0xCB, 0xF1, 0xF3, 0xF6, 0xCD, 0xC0, 0xDF, 0xDD, 0xDC, 0xDF, 0xDE, 0xD6, 0x56, 0x59, 0x4D, 0x75,
0x70, 0x77, 0x49, 0x40, 0x58, 0x5D, 0x57, 0x57, 0x53, 0x5B, 0x5B, 0x47, 0x5B, 0x59, 0x54, 0xD2,
0xDC, 0xD3, 0x54, 0x5F, 0x44, 0x45, 0x52, 0xDD, 0xC3, 0xC0, 0xC5, 0xD2, 0xD5, 0xD5, 0xDD, 0xD8,
0xC6, 0xD9, 0xD7, 0xD1, 0xD0, 0xDA, 0xCD, 0xCD, 0xC2, 0xC1, 0xC5, 0xC2, 0xC9, 0xCA, 0xCA, 0xC5,
0xD3, 0xD4, 0xD5, 0x50, 0x57, 0x55, 0xD6, 0x56, 0x5B, 0x4C, 0x77, 0x75, 0x75, 0x40, 0x44, 0x59,
0x5B, 0x45, 0x5A, 0x5A, 0x5B, 0x47, 0x5E, 0x5C, 0x53, 0xD5, 0x55, 0xD6, 0x55, 0x5C, 0x47, 0x47,
0x5B, 0x56, 0xD2, 0xDE, 0xD8, 0xD3, 0x57, 0x52, 0x51, 0xD4, 0xD0, 0xD3, 0xD1, 0xD3, 0xDD, 0xD9,
0xDE, 0xDF, 0xD9, 0xDD, 0xD9, 0xD8, 0xC2, 0xC2, 0xCD, 0xC6, 0xD9, 0xDF, 0xD0, 0xD1, 0x54, 0x54,
0x50, 0x57, 0x50, 0x5E, 0x47, 0x43, 0x43, 0x41, 0x59, 0x5B, 0x59, 0x45, 0x40, 0x42, 0x43, 0x47,
0x5B, 0x5D, 0x56, 0xD5, 0x54, 0x54, 0x50, 0x5D, 0x58, 0x5A, 0x59, 0x5C, 0xD5, 0xD2, 0xDF, 0xD3,
};
#define maxSize sizeof(wavdat)
U16 wavIndex=0;
void Pca_Init()
{
// ACC = P_SW1;
// ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=0 CCP_S1=0
// P_SW1 = ACC; //(P1.2/ECI, P1.1/CCP0, P1.0/CCP1, P3.7/CCP2)
ACC = P_SW1;
ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=1 CCP_S1=0
ACC |= CCP_S0; //(P3.4/ECI_2, P3.5/CCP0_2, P3.6/CCP1_2, P3.7/CCP2_2)
P_SW1 = ACC;
// ACC = P_SW1;
// ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=0 CCP_S1=1
// ACC |= CCP_S1; //(P2.4/ECI_3, P2.5/CCP0_3, P2.6/CCP1_3, P2.7/CCP2_3)
// P_SW1 = ACC;
CCON=0x00;//PCA控制寄存器
CMOD=0x08;//採用系統時鐘計數0x00:FOSC/12 0x02:FOSC/2 0x08:FOSC/1 0x0A:FOSC/4 0x0E:FOSC/8
CCAPM0=0x42;//PCA比較寄存器,8位無中斷
CL=0x00;
CH=0x00;
PCA_PWM0=0x00;
CCAP0L=0x7F;
CCAP0H=0x7F;
}
void SoundInit()
{
AUXR |= 0x80; //定時器時鐘1T模式
TMOD &= 0xF0; //設置定時器模式
TL0 = 0x5A; //30兆晶振,8K的採樣率定時
TH0 = 0xF1; //設置定時初值
TF0 = 0; //清除TF0標誌
TR0 = 1; //定時器1開始計時
ET0=1;
CR=1;
EA=1;
}
void main()
{
Pca_Init();
SoundInit();
while(1)
{
}
}
//控制採樣率
void timer0() interrupt 1
{
CCAP0H=wavdat[wavIndex];
if(++wavIndex>=maxSize)wavIndex=0;
}
示例代碼使用的聲音數據採樣率爲8K,所以聽上除了播放你好外,還有噪音,這也許是因爲沒有加濾波的原因,但播放22k及以上的聲音,沒有噪音,8K的語音,如果採用16K或32K採樣率播放,則噪音就小了很多!