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dsPIC ? DSC Acoustic Echo Cancellation Library User’s Guide
DOCUMENT REVISION HISTORY
Revision A (July 2004)
This is the initial release of this document.
Revision B (April 2005)
The document was updated to reflect added sample rate conversion functions and
corresponding demo changes.
Revision C (August 2008)
This revision includes the following updates for version 5.0 of the Acoustic Echo
Cancellation library.
This document has been renamed from “dsPIC30F Acoustic Echo Cancellation Library
User ’s Guide” to its new name of “dsPIC ? DSC Acoustic Echo Cancellation Library
User ’s Guide” . There has been no change to the Microchip literature number
(DS70134) other than a revision letter update.
Each chapter has been extensively reworked and reorganized to support all dsPIC
DSC devices. The previous version of the document contained seven chapters, which
have been consolidated as follows:
? Chapter 1. Introduction :
- The optional accessory kit is no longer available and the related information
has been removed.
- The reference to the user functions has been removed.
- The host system requirements section was updated to include the HTML
browser requirement.
? Chapter 2. Installation :
- The installation procedure was updated to accommodate the installation CD
file changes. See Section 2.1 “Installation Procedure” .
- The Acoustic Echo Cancellation library files have been updated and the inc
folder was renamed to h . See Section 2.2 “AEC Library Files” .
? Chapter 3. AEC Demonstration (formerly Chapter 6. Acoustic Echo Cancellation
Demo):
- The dsPICDEM? 1.1 Plus development board jumper (J9) setting has been
changed from MASTER to SLAVE. See Section 3.1.2 “Demonstration
Setup” and Figure 3-2 .
- Due to the removal of the optional Acoustic Accessory Kit, the reference to
the 14.7456 MHz oscillator in the Demonstration Setup section has been
removed.
- The demonstration procedure has been completely rewritten to provide more
information on the state of operation. See Section 3.1.3 “Demonstration
Procedure” .
? Chapter 4. Application Programming Interface (API) (formerly Chapter 3,
same title):
- This chapter has been updated with a completely new set of API functions.
See Section 4.7 “AEC Library API Functions” .
- The information in the chapter formerly known as Acoustic Echo Cancellation
Algorithm was consolidated and relocated to the Application Programming
Interface (API) chapter. See Section 4.4 “Library Usage” .
- The information in the formerly known Resource Requirements chapter was
consolidated and relocated to the Application Programming Interface (API)
chapter. See Section 4.6 “Resource Requirements” .
DS70134F-page 10
? 2004-2011 Microchip Technology Inc.
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