User`s manual

23
AXIS 210/211/211A - Audio (AXIS 211A only)
When you select Simplex - AXIS 211A speaker only mode, the speaker connected to the
AXIS 211A will play audio, but no audio will be transmitted from the AXIS 211A to other
web clients. This could be used, e.g. to provide spoken instructions to a person seen in the
network camera. This mode requires you to use the push to talk button.
Simplex - AXIS 211A microphone only mode transmits audio from the AXIS 211A to
web clients and will not receive audio from web clients. This can be used in remote
monitoring, web attractions etc., to provide live audio, as well as video, of a monitored
situation.
The max number of clients allows you to restrict the number of clients accessing the AXIS
211A. When using full duplex mode, up to 10 clients can receive video and audio from the
AXIS 211A, but only one client can transmit audio. If your application requires audio to be
transmitted and received from more than one PC client, consider using half-duplex mode
instead.
When using half duplex, the Send the sound from the active client to all other clients
option transmits the audio signal from the client that is talking to all the other clients.
Audio Input
Axis 211A can pick up audio from its built in Internal Microphone or an external audio
source (External Microphone) connected to the audio input connector. The input
sensitivity for the internal microphone can be set to set to High or Low depending on the
sound level in the monitored area, e.g. select Low if the AXIS 211A is installed in a noisy
environment. For the external audio input, the sensitivity can be set to three different
modes: Mic high sensitivity, Mic low sensitivity and Line level. See
Technical
Specifications, on page 49 for the exact maximum levels.
The Enable DC power option provides power for the external microphone. If you use a
small electret condenser microphone such as a clip-on microphone or a PC microphone, DC
power needs to be enabled. To use a high impedance dynamic microphone, DC power
should not be enabled. DC power will not harm the microphone, but if you are uncertain,
try switching it off and on. DC power is enabled by default. If you want to use a
professional microphone requiring 48V phantom power, you need an external power
supply and must use a balanced-unbalanced converter (audio transformer) in between.
It is possible to adjust the input gain for the microphone attached to the AXIS 211A, if
there are problems with the sound input being too low or high.
Audio Output
It is possible to adjust the output gain for the active speaker attached to the AXIS 211A, if
the sound from the speaker is too low or high.
When satisfied with the settings click Save or click Reset to revert to the previously saved
settings.