Dateq BCS25, Руководство пользователя

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Dateq BCS25 manual BCS26(E) telephone input module
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Internal or external hybrid
The BCS26(E) module handles incoming telephone calls over the built-in hybrid, but is also able
to remote control an external (digital) hybrid or talk show system.
With jumper J6, J7 and J1 it’s possible to select the type of operation. Jumper J6 and J7 are used
to switch between the internal or external hybrid, J1 switches the bandpass filter on or off. When
a hybrid with built in band pass filter is connected J1 should be placed in the OFF position.
(The drawing below only shows J1 and J7. J6 can be found above the transformer; see the
autogain drawing at the bottom of this page).
Autogain
The BCS26(E) is equipped with a special feature that reduces the signal from the hybrid by 6dB
when audio is sent from the mixer to the hybrid. This means that the caller is dimmed by 6dB
when the announcer in the studio speaks. This feature improves the side tone reduction with 6dB,
so creating the best possible speech intelligibility. The consequence of this auto-gain feature is
that when the caller and announcer are talking at the same time (“double talk”), the announcer in
the studio will slightly drown the voice of the caller.
This function can be disabled with jumper J13. In the first example the autogain function is
enabled.
Fig. 9: Internal hybrid, bandpass filter on
Fig. 10: External hybrid, bandpass filter off