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dsPIC ? DSC Acoustic Echo Cancellation Library User’s Guide
speech. This combination of speech and echo can be heard on the headset connected
to board 2. In this example, board 1 represents the near-end and board 2 represents the
far-end.
When started, the program initializes with acoustic echo cancellation turned OFF,
indicated by LED3 being turned OFF on the dsPIC33E USB Starter Kit. With the
acoustic echo cancellation OFF, the signal heard in the headset connected to board 2
contains noticeable echo.
The acoustic echo cancellation is enabled by pressing the switch, SW1, on the
dsPIC33E USB Starter Kit. LED3 is now turned ON and the speech signal heard on the
headset connected to board 2 becomes echo-free.
The demonstration application program invokes the EC_apply and EC_applyNLP
functions from the AEC library to suppress the unwanted far-end echo mixed with the
near-end speech.
3.2.2
Demonstration Setup
The demo application is intended to run on a dsPIC33E USB Starter Kit and MEB (not
included with the software license). Use the procedures outlined in the following
sections to set up the demonstration.
3.2.2.1
CONFIGURE MEB AND dsPIC33E USB STARTER KIT
Before applying power, you need to configure the board:
1. Insert a dsPIC33E USB Starter Kit into the starter kit connector on MEB 1, and
another one into MEB 2.
2. Connect the fold-up speaker to the headphone jack (J18) on MEB 1.
3. Connect the microphone to the microphone jack (J7) on MEB 1. Make sure the
microphone is turned on and is situated close enough to the speaker to generate
feedback into the microphone.
4. Connect the headset microphone to the microphone jack on MEB 2.
5. Connect the headset speaker to the headphone jack on MEB 2.
6. Connect each of the two dsPIC33E starter kits to a PC using the USB A-to-mini B
cable provided with the starter kit.
7. Using a pair of single-strand wires, connect pin 20 of the I/O expansion connector
(J5) on MEB 1 with pin 22 of the I/O expansion connector on MEB 2. Also,
connect pin 22 of the I/O expansion connector on MEB 1 with Pin 20 on MEB 2.
3.2.2.2
SET UP THE DEMONSTRATION
After both the boards are configured, attach the speakers and microphones, and
interconnect the boards.
DS70134F-page 28
? 2004-2011 Microchip Technology Inc.
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