Robert Bosch Home Security System VG4-200 用户手册

VG4 AutoDome Modular Camera System

VG4 Audio Connections | en

Bosch Security Systems, Inc.

User’s Manual

F.01U.089.433 | 4.0 | 2008.09

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.

The following Line In specifications should be complied with in all cases: 

–

5.5 Vpp max. Input voltage Impedance 9 Kohm, typical

–

Sampling rate 8 KHz, 16 Bit, mono

Long distances are more susceptible to introducing noise into the signal.

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:

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 

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.