DM300027 Microchip Technology, DM300027 Datasheet - Page 10

• 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 PIC24/dsPIC® DSC G.711 Speech Encoding/Decoding
Library performs toll-quality voice compression and voice
decompression. The library is an implementation of the ITU-T
G.711 standard on the dsPIC DSC and PIC24 MCU. The
encoding algorithm used is either A-law or μ-law companding
(user-selectable), and features a 2:1 compression ratio.
The G.711 library can be used for both half-duplex and
full-duplex systems.
Key Features
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Summary
The dsPIC® DSC Automatic Gain Control Library
automatically adjusts the amplitude of a speech signal to
match a set level. This is useful in speech applications
where the distance between the speech source and the
microphone is not fixed. The automatic gain control library
can be used readily with Microchip’s speech and audio
solutions for speech signal pre-processing.
Key Features
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A-law or μ-law based coding
Playback-only applications benefit from the speech
encoder utility. Encoded files can be created from the
desktop using a PC microphone or WAV file
Input signal clip detection
Hooks to control gain of external codec
Gain attack, release and leakage rate controls
Audio bandwidth: 8-48 kHz sampling rate
All functions called from a C application program
Full compliance with the Microchip MPLAB C Compiler,
Assembler and Linker
Highly optimized assembly code that uses the DSP
instructions and advanced addressing modes
Comprehensive API provides parametric control of the
AGC engine
PIC24/dsPIC® DSC G.711 Speech
Encoding/Decoding Library
dsPIC® DSC Automatic Gain Control Library
Software Solutions and Tools for the 16-bit and 32-bit Designer
(SW300026)
Applications
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G.711
Applications
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Compression Ratio
Sampling Frequency
Output Data Rate
MIPS
MOS
Memory
Hands-free cell phone kits
Speaker phones
Intercoms
Headsets
Front-end to a speech recognition system or speech
encoding algorithm
Intercoms
Emergency phones
Walkie-talkies
Mobile hands-free kits
Digital radios
Voice-over-IP telephony
2:1
8 KHz
64 Kbps
1
4-4.5
8 KB/Sec of Speech