DM300027 Microchip Technology, DM300027 Datasheet - Page 8

• Manufacturer Part Number: DM300027
• Description: BOARD DEV STARTER PIC24 28-PIN
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM300027

• Contents: Board, Cables, CD, Sample Part
• Processor To Be Evaluated: dsPIC30F/PIC24F/dsPIC33F
• Data Bus Width: 16 bit
• Interface Type: USB
• Silicon Manufacturer: Microchip
• Core Architecture: PIC, DsPIC
• Core Sub-architecture: PIC24, DsPIC30, DsPIC33
• Silicon Core Number: PIC24F, DsPIC30F, DsPIC33F
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: dsPIC30F/33F and PIC24
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Summary
The dsPIC® DSC Acoustic Echo Cancellation (AEC) Library
is fully compatible with G.167 standard for Acoustic Echo
Cancellation. The software library provides a function to
eliminate echo 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.
Key Features
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dsPIC® DSC Acoustic Echo Cancellation Library
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Simple user interface – only one library file and one
header file
All functions can be called from a C application program
Compatible with the Microchip C30 Compiler, Assembler
and Linker
Highly optimized assembly code that uses DSP
instructions and advanced addressing modes
Acoustic echo cancellation for 16, 32, 64 or 128 ms echo
delays or “tail lengths” (configurable)
Fully tested for compliance with G.167 specifications for
in-car applications
Audio bandwidth: 0 to 4 kHz at 8 kHz sampling rate
Convergence Rate: Up to 47 dB/sec., typically greater
than 30 dB/sec
Acoustic echo cancellation: Up to 50 dB, typically > 40 dB
Can be used together with the Noise Suppression (NS)
Library
Software Solutions and Tools for the 16-bit and 32-bit Designer
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Applications
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Demo application source code is provided with the Library
Can be instantiated multiple times to support multiple
input audio streams.
NLP attenuation level can be adjusted to suit application
requirements
Acoustic echo cancellation adaptation can be
force-enabled or disabled by the user application
Run-time control of key algorithm parameters is provided
Automobile hands-free cell phone kits
Speaker phones
Intercoms
Teleconferencing systems
(SW300060)