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dsPIC ? DSC ACOUSTIC ECHO
CANCELLATION LIBRARY
USER ’S GUIDE
Chapter 1. Introduction
This chapter introduces the dsPIC DSC Acoustic Echo Cancellation (AEC) Library
(referred to as the AEC library). This library provides functionality to suppress echo in
applications that are susceptible to echo. The library supports the dsPIC33F and
dsPIC33E device families. This manual provides information that you can use to
incorporate the AEC capability into your embedded solution. The following topics are
covered in this chapter:
? Acoustic Echo Cancellation Overview
? Features
? Host System Requirements
1.1
ACOUSTIC ECHO CANCELLATION OVERVIEW
Acoustic echo cancellation suppresses or cancels echoes generated in applications
due to a feedback path or coupling between input and output terminals of a system.
Figure 1-1 shows an example of a speech and telephony system, which is susceptible
to Acoustic Echo. In this case, the echo is caused due to the acoustic coupling between
the speaker and microphone at the near-end of the communication link, which results
in a perceptible and distracting echo at the far-end. In this case, an AEC algorithm
running at the near-end, will suppress the echo and improve the performance of the
system.
FIGURE 1-1:
AEC IN A SPEECH AND TELEPHONY APPLICATION
Far-End Speech
Near-End Speech
Receive Path
Acoustic Echo Canceller
Adaptive
Filter
-
∑
+
Far-End Speech
Echo
FAR-END
? 2004-2011 Microchip Technology Inc.
Send Path
Near-End Speech
NEAR-END
DS70134F-page 13
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