Datasheet > D6455B-11

D6455B-11

更新时间： 2024-11-08 23:46:07

品牌	Logo	应用领域
其他 - ETC		电信
页数	文件大小	规格书
4页	385K
描述
Telecommunication IC

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D6455B-11 数据手册

D6455A/B

EASYTAD Chip for an all Digital Telephone Answering Device with

Super Low Rate Coder and True FULL Duplex SpeakerPhone

General Description

The D6455A/B chip is a digital speech/signal processing subsystem that implements all functions of TRUESPEECH

speech compression and voice prompts, telephone line signal processing, flash memory management and True FULL

Duplex SpeakerPhone for an all digital answering machine. The D6455A/B is fully controlled by the system Host

through a simple interface protocol. The Host controller provides activation and control of all system functions such as

speech recording and playback, DTMF and call progress tone detection, DTMF and tone generation, and voice

prompting.

Host

Controller

Telephone

Phone

Line

Interface

CODEC

Voice

Prompt

ROM

D6455A/B

DSP Speech

Processor

Speaker

Phone

Interface

CODEC

ARAM

Optional

Figure 1. D6455A/B System Block Diagram

Key Features

n High-quality, new super low rate TRUESPEECH

digital speech compression allowing 25-27 minutes

of recording time per each 4 Mbit of memory

n Works with 256Kx4 (1 Mbit)*, 1Mx4 (4 Mbit) or

4Mx4 (16 Mbit)* ARAMs

n True FULL Duplex SpeakerPhone with both

acoustical and near-end echo cancellation

n Flexible storage of incoming messages (ICM),

outgoing messages (OGM). Supports multiple

OGMs and multiple mailboxes

n Programmable Thresholds for VOX, DTMF, and

Call Progress

n TRUESPEECH, natural-sound voice prompting, for

Day/Time stamp and voice instructions

n Digital Volume Control

n Supports offset playback for jumps within a

message

n DTMF generation and detection with near-end

echo cancellation for superior performance

n Low power consumption

n Simple 8-bit Host Interface

n Special commands for production line testing

n Fully compatible with the D6305B. Host software

compatible, pin-for-pin replaceable

* Supported in D6455B only

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