Streams USB audio with sound effects applied. Sound effect selected by joystick and intensity altered by tilting the mbed. Output to the mbed-application-board phono jack.

Dependencies:   C12832_lcd MMA7660 USBDevice mbed

/media/uploads/bw/img_1293.jpg

/* Uses the mbed LPC1768 and mbed-application-board to create a USB audio device
 * that streams audio from a host computer to headphones or powered speakers. 
 * A couple different sound effects can be applied to the stream in real-time,
 * and tilting the mbed alters intensity of the effect.
 *
 *                                               ECHO
 *       The joystick selects )                   |
 *       one of three effect  )       STRAIGHT -  o  - STRAIGHT
 *       modes.               )                   |
 *                                              REVERB   
 * 
 *
 *
 *                                               \\           ||    
 *       Tilting the mbed     )      ======       \\          ||
 *       determines intensity )                    \\         ||
 *       of the effect.       )
 *                                     0%         50%         100%  
 *
 * The LCD display shows the current effect mode, intesity and buffer level.
*/
Revision:
0:bbf6cf0eab95
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/effects.h	Thu Mar 27 21:27:04 2014 +0000
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Module processes 16-bit audio samples to produces delay-based sound effects.
+ * Bryan Wade
+ * 27 MAR 2014
+ ******************************************************************************/
+#ifndef EFFECTS_H
+#define EFFECTS_H
+
+#include <stdint.h>
+
+// Practical gain limit for decent sound.
+#define MAX_EFFECT_GAIN (58982) 
+
+// Available sound effect modes
+typedef enum effect_mode_t {
+    EFFECT_STRAIGHT,
+    EFFECT_ECHO,
+    EFFECT_REVERB
+} effect_mode_t;
+
+
+// Initialize module.
+void Effects_Initialize(void);
+
+// Process one audio sample.
+int16_t Effects_ProcessSample(int16_t dataIn);
+
+void Effects_SetMode(effect_mode_t mode);
+
+void Effects_SetGain(uint16_t gain);
+
+#endif
\ No newline at end of file