Microchip Technology dsPIC33F Family Manual do Utilizador descarregar pdf (Página 54)

dsPIC33F

11.7 Soft Modem Library

The Microchip data modem library is composed of

ITU-T compliant algorithms for V.21, V.22, V.22bis,

V.23, V.32 and V.32bis modem recommendations. Bell

standard 103 is also included in this library.

V.21, V.23 and Bell 103 are Frequency Shift Keying

(FSK) modems. V.32, V.32bis and V.22bis are

Quadrature Amplitude Modulation (QAM) modems. V.22

is a Quadrature Phase Shift Keying (QPSK) modem.

V.21, V.22, V.22bis, V.32 and V.32bis are all 2-wire, full-

duplex modems. V.23 is a full-duplex modem when it

operates with a 75 bps backwards channel.

V.22bis includes fallback to V.22, V.23 and V.21

standards. V.32bis optionally falls back to V.22bis, V.22

and V.21 standards.

The dsPIC DSC Soft Modem is well-suited for small

transaction oriented applications, such as, but not

limited to:

•POS Terminals

• Set Top Boxes

•Drop Boxes

• Fire Panels

• Internet Enabled Home Security Systems

• Internet Connected Power, Gas and Water Meters

• Internet Connected Vending Machines

• Smart Appliances

• Industrial Monitoring

Functions supporting ITU-T Recommendation V.42 are

provided with each library. V.42 contains a High-Level

Data Link Control (HDLC) protocol, referred to as Link

Access Procedure for Modems (LAPM) and defines

error correcting protocols for modems.

All data pump modulation and demodulation functions

are written in ASM30 assembly code yielding optimal

code size and execution time. The AT, V.42 and data

pump APIs are written in C30 C Compiler language.

Electronic documentation accompanies the modem

library to help you become familiar with and implement

the library functions. A comprehensive

“dsPIC30F Soft

Modem Library User’s Guide”

describes the required

APIs for the AT, V.42 and data pump layers.

11.8 Speech Recognition Library

The dsPIC Speech Recognition Library provides voice

control of embedded applications that require an

alternative user interface. With a vocabulary of up to

100 words, the Speech Recognition Library allows

users to control their application using spoken

commands. The Speech Recognition Library is an ideal

front end for hands-free products, such as modem

appliances, security panels and cell phones. The

Speech Recognition Library has very modest memory

and processing requirements and is targeted for the

dsPIC30F5011, dsPIC30F5013, dsPIC30F6012 and

dsPIC30F6014 processors.

Key features of the dsPIC DSC Speech Recognition

Library include:

• US English language support

• Speaker independent recognition of isolated

words

• No speaker training is required

• Hidden Markov Modem-based recognition system

• Recognition time < 500 msec

• Master library of 100 common words (listed in the

“dsPIC30F Speech Recognition Library User’s

Guide”

)

• Windows operating system-based utility allows

the user to create a custom word library from the

master library

• Additional words can be added to the master

library (fee based)

• Data tables can be stored in external memory

• Optional keyword activation and silence detection

• Optional system self-test using a predefined

keyword

• Flexible API

• Full compliance with Microchip MPLAB C30 C

Compiler Language Tools

•

“dsPIC30F Speech Recognition Library User’s

Guide”

and

“dsPIC30F Word Library Builder

User’s Guide”

• Designed to run on dsPICDEM™ 1.1 General

Purpose Development Board (DM300014)

11.8.1 RESOURCE REQUIREMENTS

• Sampling Interface: Si-3000 Audio Codec

operating at 12.0 kHz

• System Operating Frequency: 12.288, 18.432 or

24.576 MHz

• Computational Power: 8 MIPS

• Program Flash Memory: 18 KB + 1.5 KB for each

library word

• RAM: < 3.0 KB

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