UK003010 Microchip Technology, UK003010 Datasheet - Page 23

• Manufacturer Part Number: UK003010
• Description: PICSTART FIRMWARE (FLASH) V4.0
• Manufacturer: Microchip Technology
• Type: Upgrade Kitr

Specifications of UK003010

• Tool Function: Compiler
• Tool Type: Development Software Support
• Processor Series: PIC18F6720
• Core Architecture: PIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PICSTART Plus
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

dsPIC30F Acoustic Echo Cancellation Library
The dsPIC30F Acoustic Echo Cancellation (AEC)
Library provides a function to eliminate echoes
generated in the acoustic path between a speaker and
a microphone. This function is useful for speech and
telephony applications in which a speaker and a
microphone are located in close proximity to each other
and therefore, susceptible to signals propagating from
the speaker to the microphone resulting in a
perceptible and distracting echo effect at the far end. It
is especially suitable for these applications:
• Hands-free Cell Phone Kits
• Speakerphones
• Intercoms
• Teleconferencing Systems
For hands-free phones intended to be used in compact
environments, such as a car, this library is fully
compliant with the G.167 standard for acoustic echo
cancellation.
Features
• Only 2 user functions
• Full compliance with the Microchip dsPIC30F C30
• Highly optimized Assembly code, utilizing DSC
• Echo cancellation for 16, 32 or 64 ms echo delays or
© 2005 Microchip Technology Inc.
Ordering Information:
SW300060-EVAL dsPIC30F Acoustic Echo Cancellation Library Software License (Evaluation Copy)
SW300060-5K
SW300060-25K dsPIC30F Acoustic Echo Cancellation Library Software License (5K to 25K units)
SW300060-100K dsPIC30F Acoustic Echo Cancellation Library Software License (25K to 100K units)
AC300030
DS70123
(“AcousticEchoCancellerInit” and
“AcousticEchoCanceller”), both of which can be
called from either a ‘C’ or Assembly application
program
C Compiler, Assembler and Linker simple user
interface – just one library file and one header file
instructions and advanced addressing modes
‘tail lengths’ (configurable)
dsPIC30F Acoustic Echo Cancellation Library Software License (Up to 5K units)
Accessory Kit (includes: audio cable, headset, oscillators, microphone, speaker,
M/F RS-232 cable, DB9M-DB9M Null Modem Adapter)
“dsPIC30F Acoustic Echo Cancellation Library Product Overview”
(Available at: www.microchip.com)
• Fully tested for compliance with G.167
• Audio Bandwidth: 0-4 kHz at 8 kHz sampling rate
• Convergence Rate: Up to 43 dB/sec., typically > 30
• Echo Cancellation: Up to 50 dB, typically > 40 dB
• Can be used together with the Noise Suppression
• “dsPIC30F Acoustic Echo Cancellation Library
• Demo application source code is provided with the
• Contact Microchip sales for FREE evaluation
specifications for in-car applications
dB/sec.
(NS) Library, since the same processing block size
(10 ms) is used
User’s Guide” is provided to help the user
understand and use the library
library. Accessory kit available for purchase includes:
an audio cable, headset, oscillators, microphone,
speaker, DB9 M/F RS-232 cable and DB9M-DB9M
Null Modem Adapter and can be used for library
evaluation
samples
Far End
Speech
Near End
Speech
FAR END
User Application
Acoustic Echo
Receive Path
Cancellation
Adaptive
Send Path
Filter
∑
-
+
Software
Near End
Speech
DS30177T-page 17
NEAR END
Far End
Speech
Echo