Oki MSM7617, Руководство пользователя, Страница: 11 / 19

¡ Semiconductor MSM7617 Evaluation Board
11
Component Descriptions (6/8)
Component Number
Component Name
Description
ch1 MODE
SW1
ch2 MODE
SW1
S2
S1
Switches for setting channel 1 control pins.
Switches for setting channel 2 control pins.
1 NLP1
NLP2 ON Center clipping off
OPEN Center clipping on
When SOUT is below –57 dBm0, the smallest
positive value FF (hex) will be forcibly output,
eliminating low-level noise.
2 HCL1
HCL2 ON Normal mode
Echo canceller operates.
OPEN Through mode
3 ADP1
ADP2 ON Normal mode
Echo cancellation is performed by varying AFF
coefficients.
OPEN Fixed AFF coefficient mode
Coefficients are not varied. Echo cancellation is
performed with the coefficients at the point variation
was stopped.
4 HD1
HD2 ON Howling detector on
Howling will be detected and canceled.
OPEN Howling detector off
5 ATT1
ATT2 ON Attenuator on
RIN and SOUT will be input through the provided
attenuators (6 dB).
OPEN Attenuator off
6 Not used
7 Not used
8 Not used
SW Setting
8 7 6 5 4
OPEN
ch1 MODE SW1
3 2 1
OPEN
— — —
OFF/ON OFF/ON
STOP/NORM THRU/NORM
ON/OFF
ATT1
HD1
ADP1
HCL1 NLP1
ON
OPEN = 1
ON = 0
8 7 6 5 4
OPEN
ch2 MODE SW1
3 2 1
OPEN
— — —
OFF/ON OFF/ON
STOP/NORM THRU/NORM
ON/OFF
ATT2
HD2
ADP2
HCL2 NLP2
ON
OPEN = 1
ON = 0