AT75C1210 Datasheet

IC型號(hào)：
AT75C1210
PDF描述：
AT75C1210 G.723.1 Voice Processing Software Module [Updated ...
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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 Stand-alone Algorithms

鈥?G.723.1 Dual-rate Vocoder (5.3 Kbps/6.4 Kbps)

鈥?VAD/CNG Silence Compression (Annex A of G.723.1)

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

鈥?Arbitrary Tone Generator

鈥?/div>

ITU-T G.723.1 and G.711 Standard-compliant

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Available with a uClinux

廬

Device Driver

Overview

The AT75C1210 G.723.1 Voice Processing Software Module is designed to run on the

OakDSPCore

廬

subsystem of the AT75 series Smart Internet Appliance Processor. It

implements commonly-used voice processing algorithms:

鈥?/div>

a low bit-rate G.723.1 vocoder for multimedia communication

a silence compression algorithm to efficiently handle periods of silence during

communication

a high bit-rate 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>

)

AT75C1210

G.723.1 鈥?/div>

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 AT75C1210 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 AT75C1210 interface into most operating systems.

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

sion of uClinux capabilities to the complete functionality of the AT75C1210 module in a

seamless manner.

This document is made up of three sections:

1. a functional description of the supported algorithms

2. a description of the low level software interface

3. a description of the uClinux device driver

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

Rev. 1777A鈥?1/01

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