MA240014 Microchip Technology, MA240014 Datasheet - Page 15

• Manufacturer Part Number: MA240014
• Description: MODULE PLUG-IN PIC24
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of MA240014

• Accessory Type: Plug-In Module (PIM) - PIC24FJ256GB110
• Product: Microcontroller Modules
• Data Bus Width: 16 bit
• Core Processor: PIC24FJ256GB110
• Operating Supply Voltage: 3 V to 3.6 V
• Development Tools By Supplier: Integrated Development Environment, Assembler, ANSI C Compiler
• Processor Series: PIC24F
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC24
• Silicon Core Number: PIC24F
• Silicon Family Name: PIC24FJxxGBxxx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Explorer 16 (DM240001 or DM240002)
• For Use With: DM240001 - BOARD DEMO PIC24/DSPIC33/PIC32
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Line Echo Cancellation Library
This library provides a function to cancel electrical line echoes caused by 2- to
4-wire conversion hybrids in telephone lines. The library can be used in long
distance voice communication applications, especially in links involving satellite
networks and intercontinental long haul networks, as well as digital networks,
such as Voice over IP (VoIP). This library is fully compliant with the ITU-T G.168
recommendation. The library can be used for full-duplex operation. It handles
0-4 kHz audio bandwidth (8 kHz sampling of 16-bit speech data).
Speech Recognition
Automatic Speech Recognition (ASR) for our digital signal controllers
supports a variety of voice-activated applications like handset and
home appliance control. A Speech Word Library Builder and a Speech
Recognition Software Library make up the ASR software suite.
Libraries for Speech Applications
Acoustic Echo Cancellation Library
This library provides a function to eliminate the echo generated
in the acoustic path between a speaker and a microphone, such
as in a speakerphone or an intercom system. This library is fully
compliant with the G.167 standard and provides 16, 32 or 64
ms echo delays. It handles 0-4 kHz audio bandwidth and provides
echo cancellation of 40-50 dB. It also includes some sample rate
conversion functions to support input/output sampling rates of 9.6
kHz, 11.025 kHz and 12 kHz.
Speech Encoding/Decoding Library
This application library performs speech compression and decompression
and is based on a modified open-source Speex technology. The library
features a 16:1 compression ratio and an 8 kbps data rate, making
the library a good choice for digital voice communication, store-and-
playback and playback-only applications. For playback-only applications,
a PC software utility is included, allowing the designer to create encoded
speech files for playback.
Noise Suppression Library
This application library suppresses the
noise interference in a speech signal,
such as ambient noise picked up by
a microphone while capturing speech.
This algorithm is particularly useful for
systems such as hands-free phones,
speakerphones, intercoms and headsets
where an isolated noise reference is not
available. The algorithm handles 0-4 kHz
audio bandwidth and provides 10-20
dB of noise reduction. The library also
includes some sample rate conversion
functions to support input/output
sampling rates of 9.6 kHz, 11.025 kHz
and 12 kHz.
Near End
Speech
Far End
Speech
FAR END
Speech Encoding/Decoding Library features:
• 8 kHz input sample rate; 8 kbps output data
• Sorting encoded speech requires 4 Kbytes
• Optional voice activity detection
• External Flash support for playing back large
• Royalty-free, one time license fee
Speech Recognition Library features:
• Speaker independent recognition
• PC-based word library builder
• Up to 100 word vocabulary (American English)
• Supports multiple noise profiles
• Suitable for many voice control applications
rate
speech files
Line Cancellation Library features:
• 8 kHz sampling rate
• Full duplex
• Compliant with ITU-T G.168
• Royalty-free, one-time license
recommendations
User Application
Acoustic Echo
Cancellation
Receive Path
Send Path
Adaptive
Filter
-
+
NEAR END
Near End
Speech
Far End
Speech
ECHO
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