Freescale 数字应答机解决方案

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[图文]Freescale 数字应答机解决方案

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Freescale 数字应答机解决方案

作者：Freescal… 文章来源：本站点击数：更新时间：2007-3-19

A single hybrid-architecture device, incorporating both a microcontroller (MCU) and a Digital Signal Processor (DSP), offers the peripherals needed to produce a Digital Telephony Answering Device (DTAD) at a reasonable cost.

Key Benefits

Single-device solution combines MCU functionality and DSP processing power

Inexpensive ESSI connections to Codec/DAA

GPIO ports for LCD and keyboard connection

Variety of vocoders and telephony algorithms available

Integrated real-time clock

Out-of-the-box software components designed to expedite time-to-market and reduce development costs

Several of Freescale Semiconductors 56800 devices are appropriate for a DTAD application For example, as shown in the block diagram, the DSP56858 provides the following interfaces:

SSI or ESSI peripherals for seamless connection to codecs (for user interface and Telco interface

A SPI for connection to a Flash card device

An integrated time-of-day peripheral providing real-time clock

Additional general purpose input/output (GPIO) ports for LCD and keypad support

Included in Freescale Semiconductors embedded Software Development Kit are:

A wide variety of vocoder algorithms for voice compression.

A comprehensive set of drivers and framework code, enabling quick completion of software application.

The out-of-the-box software components for all on-chip peripherals, in combination with software libraries for motor control, communication, and signal processing, make it easy to develop the most demanding real-time embedded applications.

The block diagram shows a sample design featuring the DSP56858 and a real-time clock at the heart of a DTAD. An ESSI connection supports a codec for user and Telco interfaces, and a second ESSI connects to a codec that enables audio amplification. An SPI provides a link to a message storage unit incorporating Flash. A GPIO connects to an LCD and another GPIO connects to a keypad.

Block Diagram

应用手册:
http://www.freescale.com/files/dsp/doc/app_note/AN3114.pdf

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