Oki MSM7731-02, User Manual

FEBL7731-02-02

3.6

Jumper (JP) .................................................................................................................................................. 5

3.7

External Oscillator (XL2)............................................................................................................................. 6

3.8

 Extra Amplifier Setting ............................................................................................................................... 6

4. HOW TO SET THE OPERATION MODE .................................................................................. 8

4.1

Pin Control Mode......................................................................................................................................... 8

4.2

MCU Interface Mode Using On-board Registers ......................................................................................... 8

4.3

MCU Interface Mode Using External Microcontroller ................................................................................ 9

4.4

How to Write the Control Register by Using Toggle Switches .................................................................. 11

4.5

How to Read the Control Register by Using Toggle Switches ................................................................... 11

4.6

How to Set Cancellation Echo Delay Time ................................................................................................ 11

4.6.1 Single EC Mode (Acoustic Echo Cancellation Mode) ......................................................................... 11
4.6.2 Dual EC Mode (Acoustic and Line Echo Cancellation Mode) ............................................................. 12

4.7

How to Set Noise Cancellation Levels ....................................................................................................... 12

4.8

How to Set Noise Canceler Pads (NCPAD1, NCPAD2)............................................................................ 13

5. HOW TO CONTROL THE EVALUATION BOARD FOR BEST QUALITY VOICE......... 14

5.1

Overview .................................................................................................................................................... 14

5.2

Instruments ................................................................................................................................................. 14

5.3

Control Procedure ...................................................................................................................................... 14

5.3.1 STEP 1.................................................................................................................................................. 14
5.3.2 STEP 2.................................................................................................................................................. 15
5.3.3 STEP 3.................................................................................................................................................. 15
5.3.4 STEP 4.................................................................................................................................................. 16
5.3.5 STEP 5.................................................................................................................................................. 16

6. PRECAUTIONS ............................................................................................................................. 17

7. CIRCUIT DIAGRAMS.................................................................................................................. 18

Figure 1  Board Schematic .................................................................................................................................. 18
Figure 2    Chip Connection Circuits ..................................................................................................................... 19
Figure 3  Peripheral Circuits................................................................................................................................ 20