AT75C1220 Datasheet

IC型號(hào)：
AT75C1220
PDF描述：
AT75C1220 G.729A and G.711 Voice Processing Software Module ...
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201.80KB
PDF頁數(shù)：
18頁
芯片廠家：
ETC

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Features

鈥?/div>

Software Module Dedicated to Voice Processing

鈥?/div>

Optimized for the AT75 Series Smart Internet Appliance Processor (SIAP

鈩?/div>

)

鈥?/div>

Includes Several Run-time Configurable Standalone Algorithms

鈥?G.729A Vocoder (8 Kbps)

鈥?VAD/CNG Silence Compression (Annex B of G.729)

鈥?G.711 碌-law and A-law Compression (64 Kbps)

鈥?Arbitrary Tone Generator

鈥?/div>

ITU-T G.729 and G.711 Standard-compliant

鈥?/div>

Available with a uClinux

廬

Device Driver

Overview

The AT75C1220 is a software module designed to run on the DSP subsystem of the

AT75 series Smart Internet Appliance Processor. It implements commonly used voice

processing algorithms:

鈥?/div>

A low bit rate G.729 vocoder for multimedia communication.

A silence compression algorithm to efficiently handle periods of silence during

communication.

A high-quality voice compression algorithm.

An arbitrary tone generator that can be used to generate any frequency during a

programmable duration.

Smart Internet

Appliance

Processor

(SIAP

鈩?/div>

)

AT75C1220 鈥?/div>

G.729A and

G.711 Voice

Processing

Software

Module

All these algorithms have a number of parameters which can be programmed at run

time. These parameters modify the behavior of the DSP algorithms in such a manner

that they comply with the applicable standards under most situations. They also allow

the AT75C to cope with many non-standard situations often-encountered on private

telephone networks.

The AT75C1220 takes advantage of the AT75 mailbox to exchange data with the on-

chip ARM7TDMI

廬

core. The organization of the data communication channel makes it

easy to integrate the AT75C1220 interface into most operating systems.

For the developers using uClinux, a specific device driver is supplied. It allows the

uClinux capabilities to be extended to the complete functionality of the AT75C1220

module in a seamless manner.

This document is made up of three sections:

鈥?/div>

A functional description of the supported algorithms.

A description of the low-level software interface.

A description of the uClinux device driver.

Mixing low-level and driver-level programming should be avoided.

Rev. 1793A鈥?1/02

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