This program makes the WAV file of the sinewave in a local file. The sampling frequency is 8KHz. In other words, it is the quality of the telephone. The quantization precision is 16 bits. You can change the frequency of the sinewave, the amplitude by changing a parameter in the top of the program. You can change the file name, too. I suggest that you make the plain name later. You can listen the wav file which You made in Windows Mediaplayer. See: http://blogs.yahoo.co.jp/jf1vrr_station/19862738.html (Japanese)

Dependencies:   TextLCD mbed

Files at this revision

API Documentation at this revision

Comitter:
jf1vrr
Date:
Sat Apr 23 12:34:45 2011 +0000
Commit message:
Rev. 0.01A 2011/04/23

Changed in this revision

TextLCD.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 436f1e857866 TextLCD.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Sat Apr 23 12:34:45 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
diff -r 000000000000 -r 436f1e857866 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Apr 23 12:34:45 2011 +0000
@@ -0,0 +1,144 @@
+/*This program makes the WAV file of the sinewave in a local file. 
+The sampling frequency is 8KHz. In other words, it is the quality of the 
+telephone. The quantization precision is 16 bits. You can change the 
+frequency of the sinewave, the amplitude by changing a parameter in the 
+top of the program. You can change the file name, too. I suggest that 
+you make the plain name later. You can listen the wav file which You made 
+in Windows Mediaplayer.
+*/
+
+/*This program is made in reference to "Sound Programming in C Language" by Aoki Naofumi"*/
+
+#define FREQ 440 //Frequency (Hz) 
+#define AMP 0.5 //Amplitude 0 - 1
+#define FILE_NAME "/local/440_05.wav"  //Data file name max 8char.wav fffff_aa.wav
+
+#include "mbed.h"
+#include "TextLCD.h"
+
+TextLCD lcd(p24, p26, p27, p28, p29, p30);
+
+LocalFileSystem local("local");
+DigitalOut led_1(LED1);
+DigitalOut led_2(LED2);
+DigitalOut led_3(LED3);
+DigitalOut led_4(LED4);
+
+int main(void)
+{
+  typedef struct
+  {
+    int fs;
+    int bits;
+    int length;
+    double *s;
+  } MONO_PCM;
+  
+  FILE *fp;
+  MONO_PCM pcm;
+  int i, j;
+  double s;
+  short data;
+  double A, f0;
+  
+  char riff_chunk_ID[4];
+  long riff_chunk_size;
+  char riff_form_type[4];
+  char fmt_chunk_ID[4];
+  long fmt_chunk_size;
+  short fmt_wave_format_type;
+  short fmt_channel;
+  long fmt_samples_per_sec;
+  long fmt_bytes_per_sec;
+  short fmt_block_size;
+  short fmt_bits_per_sample;
+  char data_chunk_ID[4];
+  long data_chunk_size;
+  
+  lcd.cls();
+  lcd.locate(0,0);
+  lcd.printf("Audio wave\n");
+  
+  int block_length = 1000;
+  
+  pcm.fs = 8000;
+  pcm.bits = 16;
+  pcm.length = 40000; //about 5sec
+  pcm.s = (double*) calloc(block_length, sizeof(double)); 
+    
+  A = AMP;
+  f0 = FREQ;
+  
+  if ( NULL == (fp = fopen(FILE_NAME, "wb" )) )
+    error( "" );
+  
+  led_1 = 1;
+  riff_chunk_ID[0] = 'R';
+  riff_chunk_ID[1] = 'I';
+  riff_chunk_ID[2] = 'F';
+  riff_chunk_ID[3] = 'F';
+  riff_chunk_size = 36 + pcm.length * 2;
+  riff_form_type[0] = 'W';
+  riff_form_type[1] = 'A';
+  riff_form_type[2] = 'V';
+  riff_form_type[3] = 'E';
+  
+  fmt_chunk_ID[0] = 'f';
+  fmt_chunk_ID[1] = 'm';
+  fmt_chunk_ID[2] = 't';
+  fmt_chunk_ID[3] = ' ';
+  fmt_chunk_size = 16;
+  fmt_wave_format_type = 1;
+  fmt_channel = 1;
+  fmt_samples_per_sec = pcm.fs;
+  fmt_bytes_per_sec = pcm.fs * pcm.bits / 8;
+  fmt_block_size = pcm.bits / 8;
+  fmt_bits_per_sample = pcm.bits;
+  
+  data_chunk_ID[0] = 'd';
+  data_chunk_ID[1] = 'a';
+  data_chunk_ID[2] = 't';
+  data_chunk_ID[3] = 'a';
+  data_chunk_size = pcm.length * 2;
+  
+  fwrite(riff_chunk_ID, 1, 4, fp);
+  fwrite(&riff_chunk_size, 4, 1, fp);
+  fwrite(riff_form_type, 1, 4, fp);
+  fwrite(fmt_chunk_ID, 1, 4, fp);
+  fwrite(&fmt_chunk_size, 4, 1, fp);
+  fwrite(&fmt_wave_format_type, 2, 1, fp);
+  fwrite(&fmt_channel, 2, 1, fp);
+  fwrite(&fmt_samples_per_sec, 4, 1, fp);
+  fwrite(&fmt_bytes_per_sec, 4, 1, fp);
+  fwrite(&fmt_block_size, 2, 1, fp);
+  fwrite(&fmt_bits_per_sample, 2, 1, fp);
+  fwrite(data_chunk_ID, 1, 4, fp);
+  fwrite(&data_chunk_size, 4, 1, fp);
+  wait(0.5);
+  led_1 = 0;
+    
+  led_2 = 1;
+  for(i = 0; i < pcm.length/block_length; i++)
+  {
+
+    for (j = 0; j < block_length; j++)
+    { 
+      pcm.s[j] = A * sin(2.0 * 3.141592 * f0 * (i * block_length + j) / pcm.fs);
+      s = (pcm.s[j] + 1.0) / 2.0 * 65536.0;
+    
+      if (s > 65535.0) s = 65535.0; 
+      else if (s < 0.0) s = 0.0; 
+    
+      data = (short)(s + 0.5) - 32768;
+      fwrite(&data, 2, 1, fp);
+    }
+  }
+  led_2 = 0;
+  fclose(fp);   
+  free(pcm.s);
+  
+  lcd.locate(0,1);
+  lcd.printf("Done!\n");
+  
+  return 0;
+}
\ No newline at end of file
diff -r 000000000000 -r 436f1e857866 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Apr 23 12:34:45 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912