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VG4 Modular Camera System VG4 Audio Connections | en 65
Bosch Security Systems, Inc. User’s Manual F.01U.133.268 | 6.0 | 2010.03
9 VG4 Audio Connections
The audio version of the VG4 AutoDome has one audio input for line signals. The audio signals
are transmitted one-way and in-sync with the video signals. As a result, a door intercom
system can be connected at the camera location.
9.1 Audio Line Input Specifications
The following Line In specifications should be complied with in all cases:
– 5.5 Vpp max. Input voltage Impedance 9 Kohm, typicalSampling rate 8 KHz, 16 Bit, mono
9.1.1 Wire Specifications
Long distances are more susceptible to introducing noise into the signal.
9.1.2 Connections
The Audio Input must be connected to the Biphase Input as follows:
1. Remove the 110 ohm Biphase termination resistor.
2. Connect an audio source with line level to the Biphase input of the VG4 as shown in the
chart below:
9.1.3 Activating Audio Reception
To configure audio via the Web browser, do the following:
1. Open the IP AutoDome LivePage, then click the Settings tab.
2. Click the Camera Settings link from the left pane, then click Miscellaneous. The IP
AutoDome displays the Audio settings.
3. Click the Audio radio button to activate audio over IP.
NOTICE! The line ports of the intercom should be used for transmitting audio signals on the
intercom systems.
NOTICE! There is an internal gain level adjustment in case the signal level is too low.
Wire Type: Coax wire, AWG is dependant on the connector style selected
Maximum Distance: Depends on the signal level
Contact Description
Biphase + Audio In
Biphase - Ground
NOTICE! The audio signal is sent in a separate data stream parallel to the video data, and so
increases the network load. The audio data is encoded according to G.711 and requires an
additional bandwidth of approximately 80 Kbit/s for each connection.