MSM7718-01 查看數據表（PDF） - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

BLOCK DIAGRAM

ATTtgrx

Tone Generator (DTMF etc.)

Tone Detector (DTMF etc.)

ATTtgtx

ATTtx

ATTsL

+

Center

Clip

–

SinL

Line

Adapive FIR Filter

(LAFF)

SoutL

Coeff.L0

Coeff.L1

RoutL

Power Calc.

Howling Detector

Double Talk Detector

RinL

ATTrx

VOXO

GainL ATTrL

Line Echo Canceler

L/m

m/L

Voice Detect

PCM CODEC

SGR

SGT

VREF

L/m

AIN1– –

AIN1+ +

BPF

GSX1

AIN2

–

+

ADC

GSX2

VFRO

PWI

AOUT–

1.2 kW

–

+

AOUT+

–1

1.2 kW

RC LPF

RC LPF

DAC

LPF

m/L

MCU Interface

P/S&S/P

2100 Hz Detect

m/L

Mute

L/m

Power

Detect

Noise

Gen.

Flash

Memory

Controller

(Reserved)

ADPCM TRANSCODER

ADPCM

CODER

P/S

ADPCM

DECODER

S/P

Timing

Gen.

Clock Gen. Test Interface

VOXI

MLV0

MLV1

MLV2

MUTE

D7-0

A20-0

WE

OE

CS1

CS2

RP

IS

BCLKA

SYNCA

IR

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