BRAVE Steel
–
User and service manual 53
Parameter
Value
Meaning
Basic
76
b
Threshold for switching on the microphone
1-4 (4 is the highest)
2
There is a simultaneous signal from the microphone and the speaker on the
telephone line, to ensure that the Brave doesn‟t produce acoustic feedback. In
the Hands Free circuit there are several functioning blocks for supressing this
feedback. The basic one is a circuit for semi-duplex operation, where the
incoming signal weakens the microphone and the signal from the microphone
weakens the incoming signal. Thresholds for switching on the microphone are
set in this parameter, the lower the value the higher the sensitivity of the
microphone. In noisy surroundings it is recommended to use a higher value with
combination of parameters 71,75, 77.
Parameter
Value
Meaning
Basic
77
s
Speed of switching over voice atomisation
1-4 (4 is the slowest)
2
Parameters 75, 76 describes the principle of acoustic feedback and the speed
with which the circuit switches over, the quality of incoming or outgoing sounds
are set with parameter 77.
Parameter
Value
Meaning
Basic
78
l
VA characteristic for line connection (0/1)
1
Nearly every country in the world has different telephone norms and this
parameter enables you to lower the voltage on the Brave‟s terminals to connect
telephone line voltages in active state by 1V. Where it is required the respective
norm
I=0
lowers line voltage by 1V, as standard it is
l=1
.
Switchover time [ms]
s
- choice
1
1
2
2
4
3
8
4
