MSM7718-01 データシートの表示（PDF） - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718

Line Echo

Canceler

Line

PCM

CODEC

MSM7718-01

ADPCM

CODEC

Slave telephone

Microphone

and speaker

of the master

telephone

PCM

CODEC

Notes : The PCM signals of the ADPCM transcoder are assigned to time slot 2. (The PCM signals

of the PCM CODEC are always assigned to time slot 1.) The PCM signals of an external

PCM CODEC are assigned to time slot 3.

Route between the line and the slave telephone

PCMLNI and PCMLNO are assigned to time slot 1 and PCMACI and PCMACO are

assigned to time slot 2.

Turn on the line echo canceler, and establish the route between the line and the slave

telephone.

Route between the master telephone's microphone/speaker (handsfree) and the slave

telephone

PCMLNI and PCMLNO are assigned to time slot 3 and PCMACI and PCMACO are

assigned to time slot 2.

Turn on the line echo canceler, and establish the route between the microphone/

speaker of the master telephone and the slave telephone.

Route between the line and the master telephone's microphone/speaker (handsfree)

PCMLNI and PCMLNO are assigned to time slot 1 and PCMACI and PCMACO are

assigned to time slot 3.

Put the line echo canceler into “through mode”, and establish the route between

the line and the microphone/speaker of the master telephone.

Various routing can be implemented providing extension of external PCM CODECs.

Figure 4 PCM Signal Connection Example 2

9/38

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