GL 6551

4

NO

SYMBOL

FUNCTION

1

FILTER OUT

Filter Amp Output Terminal.

2

FILTER IN

Filter Amp (+) Input Terminal.

Make a various kinds Filters.

3

COMP OUT

Compressor Output Terminal.

4

DATA IN

Connected to (-) Input terminal of Compressor Output Amp

through resistor

Signal which is input to this terminal is output to COMP OUT

(Pin3). (not compress)

5

C-ACF

Coupling capacitor connect Terminal.

Determined Low cutoff frequency of Compressor block by capacitance.

6

COMP RECT

Rectifing Capacitor external connect Terminal.

Determined Recovery time and Attack time of Compressor by

Capacitance.

7

COMP NF

Input resistor and decoupling capacitor of Compressor Mic Amp

external connect Terminal. Determined Mic Amp Gain by resistor.

Max gain condition is not connect resistor.

8

COMP IN

Compressor Mic Amp (+) Input Terminal.

Same potential with COMP REF (Pin 9).

9

COMP REF

Reference voltage of Compressor Internal Amp Output Terminal.

10

GND

Ground Terminal.

11

COMP MUTE

“L” state – Compressor Output Mute.

Input signal of Data In terminal is output to COMP OUT (Pin3).

“H” state – open.

12

THROUGH

“L”state – Compressor and Expander Logalithm 1 (Constant Gain)

“H” state – open.

13

EXP MUTE

“L” state = Expander Output is muting.

Data out to DATA OUT (Pin 17) Terminal.

“H” state – open.

14

EXP REF

Reference voltage of Expander Internal Amp output Terminal.

15

EXP IN

Expander Input Amp (+) Input Terminal.

16

EXP NF

Expander Input Amp (-) Input Terminal.

17

DATA OUT

Expander Input Amp Input Terminal.

18

EXP RECT

Rectifing capacitor external connect Terminal.

Determine Attack time and Recovery time of Expander by

Capacitance.

19

EXP OUT

Expander Output Terminal.

20

Vcc

Power Supply.