录音机 采样率 问题

qlfsky

各位大牛，我把原子战舰板子自带的录音机程序采样率改为48000后录音的语速变快，不知为何，请大家指教！

void recoder_enter_rec_mode(u16 agc)

{

//??????IMA ADPCM,???ù??????????????:

  //???ù??=CLKI/256*d;

//???èd=0,??2±???,?????§????12.288M.????Fc=(2*12288000)/256*6=16Khz

//??????????PCM,???ù???±?????????ù?? 

    VS_WR_Cmd(SPI_BASS,0x0000);    

  VS_WR_Cmd(SPI_AICTRL0,48000); //?è?????ù??,?è????8Khz

  VS_WR_Cmd(SPI_AICTRL1,agc); //?è??????,0,×???????.1024?à?±??1±?,512?à?±??0.5±?,×??ó??65535=64±?

  VS_WR_Cmd(SPI_AICTRL2,0); //?è??????×??ó??,0,?ú±í×??ó??65536=64X

  VS_WR_Cmd(SPI_AICTRL3,6); //×ó?¨??(MIC???ù??????)

VS_WR_Cmd(SPI_CLOCKF,0X2000); //?è??VS10XX???±??,MULT:2±???;ADD:?????í;CLK:12.288Mhz

VS_WR_Cmd(SPI_MODE,0x1804); //MIC,?????¤??    

  delay_ms(5); //????????1.35ms 

  VS_Load_Patch((u16*)wav_plugin,40);//VS1053??WAV?????è??patch

}

//??????WAV?·.

void recoder_wav_init(__WaveHeader* wavhead) //??????WAV?·   

{

wavhead->riff.ChunkID=0X46464952; //"RIFF"

wavhead->riff.ChunkSize=0; //?????·?¨,×??ó?è??????

wavhead->riff.Format=0X45564157; //"WAVE"

wavhead->fmt.ChunkID=0X20746D66; //"fmt "

wavhead->fmt.ChunkSize=16; //?ó????16??×???

wavhead->fmt.AudioFormat=0X01; //0X01,±í??PCM;0X01,±í??IMA ADPCM

  wavhead->fmt.NumOfChannels=1; //???ù??

  wavhead->fmt.SampleRate=48000; //8Khz???ù?? ???ù????

  wavhead->fmt.ByteRate=wavhead->fmt.SampleRate*2;//16??,??2??×???

  wavhead->fmt.BlockAlign=2; //?é?ó??,2??×??????????é

  wavhead->fmt.BitsPerSample=16; //16??PCM

    wavhead->data.ChunkID=0X61746164; //"data"

  wavhead->data.ChunkSize=0; //?????ó??,???è??????  

}

    

正点原子

估计是FATFS写入SD卡的速度,不够快,导致写入数据有丢失,从而听起来像声音变快了.
48Khz采样,每秒钟有96KB的数据需要写入SD卡.

我爱STM_32

那些注释是哪国的语言啊？   看不懂

今天天气不好

我爱STM_32 发表于 2013-7-24 11:34
那些注释是哪国的语言啊？   看不懂

太有才了，笑死我了