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.
*/
Committer:
bw
Date:
Thu Mar 27 21:43:41 2014 +0000
Revision:
2:9429f84ea165
Parent:
0:bbf6cf0eab95
Clean up comments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bw 0:bbf6cf0eab95 1 /*******************************************************************************
bw 0:bbf6cf0eab95 2 * Implements delay lines for audio samples.
bw 0:bbf6cf0eab95 3 * Bryan Wade
bw 0:bbf6cf0eab95 4 * 27 MAR 2014
bw 0:bbf6cf0eab95 5 ******************************************************************************/
bw 0:bbf6cf0eab95 6 #ifndef DELAY_H
bw 0:bbf6cf0eab95 7 #define DELAY_H
bw 0:bbf6cf0eab95 8
bw 0:bbf6cf0eab95 9 #include <stdint.h>
bw 0:bbf6cf0eab95 10 #include <stdlib.h>
bw 0:bbf6cf0eab95 11
bw 0:bbf6cf0eab95 12 typedef struct delay_t delay_t; // Opaque type declaration.
bw 0:bbf6cf0eab95 13
bw 0:bbf6cf0eab95 14 // Get a ptr to a new delay struct
bw 0:bbf6cf0eab95 15 delay_t *Delay_Create(void);
bw 0:bbf6cf0eab95 16
bw 0:bbf6cf0eab95 17 // Configure the delay length and ram location
bw 0:bbf6cf0eab95 18 bool Delay_Configure(delay_t *delay, void *ram, size_t size);
bw 0:bbf6cf0eab95 19
bw 0:bbf6cf0eab95 20 // Write one sample with feedback to the delay and get one sample out.
bw 0:bbf6cf0eab95 21 int16_t Delay_WriteWithFeedback(delay_t *delay, int16_t dataIn, uint16_t gain);
bw 0:bbf6cf0eab95 22
bw 0:bbf6cf0eab95 23 #endif