MSM7617 查看數據表（PDF） - Oki Electric Industry

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MSM7617

2-Channel Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7617

PIN DESCRIPTIONS (Continued)

Pin

Symbol Type

Description

24

SG11

I S output gain control pins for channel 1 (refer to the block diagram).

25

SG10

These pins amplify the output level of SOUT. The gain level can be set even

during the echo canceler disable mode.

SG11 SG10 Gain Level

0

0 0 dB

0

1 +6 dB

1

0 +12 dB

1

1 Not used

26

SA11

I S input attenuator control pins for channel 1 (refer to the block diagram).

27

SA10

These pins attenuate the input level of SIN. Use them if ERL is large.

The attenuation level can be set even during the echo canceler disable mode.

SA11 SA10 Attenuation Level

0

0 0 dB

0

1 –6 dB

1

0 –12 dB

1

1 Not used

29

RGC11

I R input level control pins for channel 1 (refer to the block diagram).

30

RGC10

Excessive input (PCM level is at maximum value) causes a malfanction.

Use these pins when there is a possibility of excessive input.

RGC11 RGC10 Level Control Mode

0

0 Off

0

1 GC: On (control level = –20 dBm0)

By the R gain controller, levels from –20 to –11.5 dBm0 will

be suppressed to –20 dBm0 and those above –11.5 dBm0 will

always be attenuated by 8.5 dB. This is effective to prevent

excessive input and howling for hands-free applications.

1

0 Inhibited

1

1 ±6LR: On

Applies –6 dB to excessive inputs using the level adjuster

provided on R and S I/O. Since +6 dB also is applied at the

output, the total level will not change, making this effective

against line echo.

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