Headset Intercom Audio Pathways; Microphone Summing And Alc - Tech Works CI-HSI-41 System Planning & Installation Manual

Headset Intercom Audio Pathways:

MICROPHONE 1
M
ICROPHONES ARE EXTERNAL
S
HOWN HERE FOR CLARITY
MICROPHONE 2
MICROPHONE 3
MICROPHONE 4
Each Headset's microphone is summed to all the other Headsets Earphones except itself
this sum is known as "All others, except me".
Headset # 1 may have its microphone controlled by the "Talk Switch" or be "Always On", which is
a jumper selection inside the unit.
There are three Audio Pathways in the HSI-41:
Communications between Headsets
Communications on the Collaboration Buss, CI-BUSS
Monitoring Output to the PA-BUSS
All inputs are Summed before the ALC for a common group signal.
The ALC passes signals, when the Talk Switch is Active, TALK_SW or ALWAYS.
TALK SW
ALWAYS
Headset #1 Microphone always sums to the BUSSes, the others are jumper selectable.
Headset #2 thru #4 Microphone sums ON OFF, jumper selectable.
The ALC may be enabled, or inactive (Muted). This has no effect on headset to headset
Communications.
Headset # 1 may Selectively Listen the CI-BUSSes:
Master Connector:
Slave Connector:
Headsets #2 thru #4 may Selectively Listen the CI-BUSSes:
Master Connector:
Slave Connector:
6/29/2017 Tech Works CI-HSI-41 Systems Planning & Installation Manual
TALK SW
ALWAYS
1
PRE-AMP
,
2
PRE-AMP
3
PRE-AMP
4
PRE-AMP
1
SUM
2,3,4
ON OFF
ON OFF
ON OFF
ON OFF
MASTER INPUT MA
SLAVE INPUT SL
MASTER INPUT
SLAVE INPUT
SUM
2,3,4
FOUR
HEADSETS
MA
SL
SUM
1,3,4
MA
SL
SUM
1,2,4
MA
SL
SUM
1,2,3
MICROPHONE GAIN
T
HRESHOLD OF
L I
IMITING NDICATOR
O = M
FF UTED
G = O
REEN N
R (F ) =
ED LASHING
L
IMITING
AUTOMATIC LEVEL
CONTROL (ALC)
~3dB/STEP
MUTE
EARPHONE 1
E ,
ARPHONES ARE EXTERNAL
S
HOWN HERE FOR CLARITY
EARPHONE 2
EARPHONE 3
EARPHONE 4
ALC (HEADSETS )
~0dBm
Page 8 of 13