AT75C1212 Datasheet

IC型號：
AT75C1212
PDF描述：
AT75C1212 G.723.1 Voice Processing and Multi-way Conferencin...
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41頁
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ETC

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Features

鈥?/div>

Software Module Dedicated to Voice Processing and Multi-way Conferencing

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 (Annexe A of G.723.1)

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

鈥?Arbitrary Tone Generator

鈥?DTMF Detector

鈥?Echo Canceller

鈥?/div>

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

鈥?/div>

Either up to Two Decode Channels with G.723.1 Standard, or up to Four Decode

Channels with G.711 Standard

鈥?/div>

Available with a uClinux

廬

Device Driver

Overview

The AT75C1212 Multi-way Conferencing 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>

Low bit-rate G.723.1 vocoder for multimedia communication.

Silence compression algorithm to efficiently handle periods of silence during

communication.

High bit-rate voice compression algorithm.

Arbitrary tone generator that can be used to generate any dual-tone or single-tone

frequency during a programmable duration.

DTMF detector to decode incoming DTMF signaling.

An echo canceller that eliminates the near-end echo.

Smart Internet

Appliance

Processor

(SIAP

鈩?/div>

)

AT75C1212

Multi-way

Conferencing

Software

Module

The implemented 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 AT75C1212 to cope with many non-standard situations often encoun-

tered on private telephone infrastructures.

Moreover, the AT75C1212 module is able to perform multi-way conferencing. Either up

to two independent decode channels with G.723.1 or up to four decode channels with

either 碌-law or A-law compression are available with no penalty on the voice quality.

The AT75C1212 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 AT75C1212 interface into most operating systems.

For developers using uClinux, a specific device driver is supplied, thereby assuring the

extension of uClinux capabilities to the complete functionality of the AT75C1212 mod-

ule in a seamless manner.

This document is made up of three sections:

1. Functional description of the supported algorithms.

2. Description of the low level software interface.

3. Description of the uClinux device driver and full integration of AT75C1212

functionality.

Note:

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

Rev. 2663A鈥揑NTAP鈥?7/02

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