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dsPIC ? DSC Acoustic Echo Cancellation Library User’s Guide
3.1.2.3
PROGRAM THE dsPIC DSC DEVICE
Use this process to load the AEC demo into the dsPIC DSC device on the
dsPICDEM 1.1 Plus development board.
1. On your PC, launch MPLAB IDE and open the dsPIC33F EC demo.mcp project
located in the demo folder. For more information on using MPLAB IDE, refer to
the “MPLAB ? IDE User ’s Guide” (DS51025).
2. Import the project hexadecimal file by selecting either:
? File>Import>dsPIC33F EC demo1.hex for board 1 or
? File>Import>dsPIC33F EC demo2.hex for board 2
3. Select Programmer>Connect to link the MPLAB ICD 3 to the dsPIC DSC target
device. The Output window confirms that the MPLAB ICD 3 is ready.
4. Select Programmer menu>Program . The Output window displays the download
process and indicates that the programming has succeeded.
5. When the program is loaded, disconnect the MPLAB ICD 3 from the board
(remove the phone cable from the MPLAB ICD 3 connector). When you have
done this, you will see the acoustic echo cancellation information in the LCD
display.
6. Repeat steps 2 through 5 for the second board.
7. Make sure that the two boards are not located too close to each other to avoid
any acoustic coupling between the two boards.
Note:
3.1.3
The MPLAB ? REAL ICE? In-Circuit Emulator can be used instead of the
MPLAB ICD 3.
Demonstration Procedure
After the demonstration application has been programmed into both devices, the
application is now ready to run. Use the following procedure to run the demonstration:
1. Press the Reset button on board 1. Wait till LED1 through LED4 on board 1 turn ON.
Now Reset board 2. Wait until LED1 through LED4 on board 1 and board 2 turn OFF.
This indicates that the boards are synchronized and the demo is running.
2. Put on the headset connected to dsPICDEM 1.1 Plus development board 2.
3. Begin speaking into the microphone input of the headset. You should observe the
top bar of the volume unit (VU) meter rising and falling in time with your speech.
This will be mimicked by the second bar of the VU meter on board 1. On the
speaker output of the headset, you should be able to hear an echo of your own
speech.
4. If desired, have someone simultaneously speak into the microphone connected to
the dsPICDEM 1.1 Plus development board 1. In this case, you will hear the other
person’s speech as well as an echo of your own speech.
5. Press the switch, SW1, on the dsPICDEM 1.1 Plus development board 1. Observe
that the LED1 on board 1 turns on, indicating that the AEC algorithm is active.
6. Again, speak into the microphone of the headset. You should no longer hear the
echo of your own speech.
7. To observe acoustic echo cancellation during double talk, have a person simulta-
neously speak into the microphone connected to dsPICDEM 1.1 Plus development
board 1. You will only hear the other person’s speech, free of the echo of your own
speech. You will be able to experience the difference in ease of conversation by
switching the echo canceller ON and OFF while you and the other person are
speaking normally.
DS70134F-page 24
? 2004-2011 Microchip Technology Inc.
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