Axis 214 PTZ User Manual page 21

Audio Channels
There are two mono audio channels between the AXIS 214 PTZ and other clients, one for receiving audio
and one for transmitting audio. Each audio channel can be turned on or off, which means that there are
four audio mode options that can be used.
• Full-duplex audio is when you can transmit and receive audio (talk and listen) at the same time,
as when having a telephone conversation. The only controls you may wish to use are the mute
buttons to turn off the sound, and the level sliders for adjusting the input/output volume. This
mode requires the client PC to have a sound card with support for full-duplex audio. If your avail-
able bandwidth is 0.2 Mbit/s or less, it is recommended that you use Half-duplex mode instead.
• Half-duplex mode also transmits and receives audio in both directions, but only in one direction
at a time (with the help of the push-to-talk button). To speak, press and hold the button (check that
the microphone is not muted). When finished speaking, release the button to receive audio. The
push-to-talk button is configured from AMC. Half-Duplex mode is best if you only have limited
bandwidth available.
• In Simplex - AXIS 214 PTZ speaker only mode, the speaker connected to the AXIS 214 PTZ will
play audio, but no audio will be transmitted from the AXIS 214 PTZ to other web clients. This
could be used to e.g. provide spoken instructions to a person viewed in the camera. This mode
requires the use of the push-to-talk button.
• Simplex - AXIS 214 PTZ microphone mode transmits audio only from the microphone connected
to the AXIS 214 PTZ to web clients. It will not receive audio from other web clients. This can be
used in remote monitoring, and web attractions to provide live audio, as well as video, of a moni-
tored situation.
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
Audio from an external microphone or a line source can be connected to the Line/Mic In socket of the AXIS
214 PTZ. The audio source can be set to Microphone or Line. If you are using a microphone, the input
sensitivity can be set to High or Low. See Technical Specifications, on page 43 for the exact maximum
levels.
The Enable microphone power option provides DC power for the external microphone. If you use a small
electret condenser microphone such as a clip-on mic or a PC microphone, this option needs to be enabled.
To use a high impedance dynamic microphone, DC power should not be enabled. Using DC power will not
harm the microphone. The default value is DC power enabled. 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.
If there are problems with the sound input being too low or high, adjust the input gain for the microphone
attached to the AXIS 214 PTZ.
Audio Output
If the sound from the speaker is too low or high it is possible to adjust the output gain for the active
speaker attached to the AXIS 214 PTZ.
When satisfied with the settings, click Save, or click Reset to revert to the previously saved settings.
AXIS 214 PTZ
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