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

(2) CR1 (Setting of ADPCM operating mode and PCM I/O signals)

CR1

Initial value

B7

ADPCM

MODE

0

B6

ADPCM

RESET

0

B5

PCM AD

SEL

0

B4

TX

MUTE

0

B3

RX

MUTE

0

B2

RX

MLV2

0

B1

RX

MLV1

0

B0

RX

MLV0

0

B7 ... ADPCM algorithm

0: 32 kbps (G.726) 1: Reserved

B6 ... Transmitter/receiver ADPCM resetting (conforming to G.726) 1: Reset

B5 ... PCM I/O multiple timing control (PCMADI and PCMADO pins) of the ADPCM CODEC

0: Time slot 1 1: Time slot 2

B4 ... Muting of transmitter ADPCM data 1: Mute

B3 ... Muting of receiver ADPCM data 1: Muting specified by bits B2, B1, and B0 is enabled.

This bit is valid when the MUTE pin is “0”.

B2, B1, B0 ... Setting of a receiver voice path mute level

(MLV2, MLV1, MLV0) =

(0, 0, 0) :

(0, 0, 1) :

(0, 1, 0) :

(0, 1, 1) :

(1, 0, 0) :

(1, 0, 1) :

(1, 1, 0) :

(1, 1, 1) :

Through

– 6 dB

–12 dB

–18 dB

–24 dB

–30 dB

–36 dB

MUTE

24/38

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