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DATEQ Silence detector user manual

Settings

To adjust the internal jumper-settings the SD-1 has to be opened. First loosen the bolds at the front

and at the back of the SD-1 one turn. Next unscrew three the screws of the top-lid completely. Now

the lid can be folded of the SD-1.

With the internal dip-switches some extra settings can be made. In the drawing below the dip-

switches are shown.

RP4

RP3

C37

R45

C35

C33

Vcc

C34

Pilot alarm

When this function is enabled the backup-device will be activated when the pilot-tone (19kHz) is not

active or when the audio at the main-input stops. When this switch is disabled (default) the backup

device will only start when no audio is present at the main input. The pilot-tone detection level can be

adjusted with trimmer RT1.

Inverted outputs

By activating this switch the alarm outputs will be inverted.

Pulsed outputs

When this switch is active the start and stop output will generate a 100mSec pulse to start and stop

the backup-device. This function can be combined with the 'inverted outputs' function.

Timing mode

With this switch the detection-mode can be adjusted.

When the switch is in the ON-position the start and stop timers will reset as soon as an audio-signal

is detected.

When the switch is in the OFF-position the timers will count up and down according to the presence

of the detected signal.

• The advantage of disabling this function: The backup device will not stop when there are only

short sporadic signals or noises on the line.

• The advantage of enabling this function: When in an interview a natural silence occurs the timers

will immediately reset when a person starts to speak.

RP2

RP1

C36

R22

C24

R25

D11

R24

R27

D10

U12

Switch number

Settings

Function

Pilot alarm

Inverted outputs

Pulsed outputs

Timing mode