Introduction - AKG AS8 Bedienungsanleitung

1. Introduction

Congratulations!. By purchasing the AKG AS8, you now own the most advanced automatic mixer
available. In addition, you'll find the AS8 easy to set up and operate. As you are by now aware,
the AS8 is computer controllable . Most of the features of the AS8 are adjustable remotely using
this application.
The AS8 Automatic Microphone Mixer is an 8 channel, single rack space audio mixer. Using
Lectrosonics' unique Adaptive Level Proportional mixing algorithm, the automatic action is inau­
dible and simple to set up. The AS8 offers remote control of all channel levels and the master level.
In addition, a sophisticated compressor/leveller is included for dynamic range control of the audio
program material. The AS8 has an RS-232 port for remote setup or control by a computer or other
RS-232 compatible controller. More than one AS8 may be coupled together when applications
call for more than 8 channels.
As an added security feature, user access to the compressor/leveller system, the auto/direct mode
control switches, and remote level input port may be disabled from this application. Even if the
unit is then used without connection to a computer, the user will still be unable to access the
disabled features.
If you find you have questions about proper setup procedures for the AS8, consult the Installation,
Setup, and Troubleshooting instructions section in this brochure. Figure 1 shows the simplified block
diagram of the AS8.
DIR OUT
DIRECT/AUTO
PHANTOM POWER
+5V
TO uP
+15V
MIC IN + +
MIC
PREAMP
MIC IN -
-
MIC GND
PREAMP GAIN
0dB (LINE)
+30dB (MIC)
+50dB (MIC)
Remote Level CH1
Remote Level CH2
Remote Level CH3
Remote Level CH4 A/D
Remote Level CH5 CONV
Remote Level CH6
Remote Level CH7
Remote Level CH8
Remote Level Master
Auto Mix Log In
Figure 1 - AS8 Block Diagram
1 OF 8 INPUT CHANNELS
CHAN
ON
CHANNEL LEVEL
AUDIO
VCA
FROM D/A
CONVERTER
SPEECH LOG
FILTER CONVERTER
From CH1
From CH2
From CH3
From CH4
From CH5
From CH6
From CH7
From CH8
Compressor/
Leveller
Threshold
HI LO
Tone Control
AM8-TC
FROM
Only
OTHER
CHANNELS
TO A/D
CONVERTER
To CH1 Dir/Auto CH1
To CH2 Dir/Auto CH2
To CH3 Dir/Auto CH3
D/A
To CH4
A/D Dir/Auto CH4
CONV
To CH5 Dir/Auto CH5
CONV
To CH6
Dir/Auto CH6
To CH7 Dir/Auto CH7
To CH8 Dir/Auto CH8
SERIAL DATA LINK
25
AS8/AS8TC
MAIN IN 1
MIX MINUS OUT
2
EXPANSION
IN
AUTO MIX 3
LOG IN
MAIN OUT 1
EXPANSION
MIX MINUS IN 2
OUT
3
AUTO MIX
LOG OUT
MAIN
OUTPUT
MAIN
LEVEL
RS-232 OUT
RS-232 IN
68HC705
uC
Compressor/Leveller
Gain Reduction Display
12dB
9dB
6dB
SERIAL
EEPROM
3dB