bryan wade / Mbed 2 deprecated usb_sound_effects

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.
*/

effects.h

Committer:
bw
Date:
2014-03-27
Revision:
2:9429f84ea165
Parent:
0:bbf6cf0eab95

File content as of revision 2:9429f84ea165:

/*******************************************************************************
 * 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