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Scenario
JP1
(All heads in this
(In = Global
condition)
Mute Active)
On hook, no
IN
1
Rx audio
On hook, no
OUT
1
Rx audio
On hook, Rx
IN
1
audio
On hook, Rx
OUT
1
audio
Off hook
IN
1
(local)
Off hook
OUT
1
(local)
Off hook
IN
1
(remote)
Off hook
OUT
1
(remote)
Off hook
IN
1
(local+remote)
Off-hook
OUT
1
(local+remote)
PTT (local) off
IN
0
hook
PTT (local) off
OUT
0
hook
PTT (local) on
IN
0
hook
PTT (local) on
OUT
0
hook
PTT (remote)
IN
1
on hook local
PTT (remote)
OUT
1
on hook local
PTT (remote)
IN
1
off hook local
PTT (remote)
OUT
1
off hook local
T2004 Multi-Control Head System Manual
© Tait Electronics Limited May 2004
controlled accordingly. This is enabled by fitting JP1, for the Global Mute
feature.
In order to accomplish this, some I/O lines of the microprocessor have been
reassigned to new functions. The control of the audio output is based on a
truth table that uses the state of the PTT, Hook and Line Sense inputs as its
control elements.
The audio truth table is shown below.
PTT
Hook
Global Mute
Switch
Line Drive
(0= Active i.e
Transmitting)
(1= On hook)
(1= mute other heads)
1
0
1
0
1
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
1
0
1
1
1
0
1
0
1
0
0
1
0
0
Spkr
Global
Mute
Mute Line
Sense
(1=mute active
(1= activate mute)
i.e.no audio)
0
0
0
0
0
0
0
0
1
0
1
0
1
1
0
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
Functionality
Comment
Everyone can hear
audio
Everyone can hear
audio
Only local head has Rx
audio
Because jumper is out,
line drive does not
affect other heads
Everyone else muted
Hear everything
Everyone off hook
hears audio
Hear everything
Mute local
Mute local
All muted
Mute local but no-one
else
Mute local (same as
'Off hook remote')
Hear everything
Hear everything
Hear everything
39
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