Axis Communications 243SA - Manual (Page 25)

25 AXIS 243SA - Audio
Half-duplex mode also transmits and receives audio in both directions, but only in one
direction at a time. This means that you must select when to receive or transmit audio 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, release the button. You will now be receiving
audio from the other end of the connection.
Note that the push-to-talk button is configured from AMC, see AXIS Media Control (AMC),
on page 15. It is also possible to configure the push-to-talk button so that it toggles
between speaking and listening modes. Half-Duplex mode is best if you only have limited
bandwidth available.
When selecting Simplex speaker only mode, the speaker connected to AXIS 243SA will
play audio, but no audio will be transmitted from AXIS 243SA to other web clients. This
could be used to provide spoken instructions to a person seen in a camera. In this mode use
the push-to-talk button.
The Simplex - microphone only mode only transmits audio from the AXIS 243SA to any
web client. It does not receive audio from other web clients. This can be used in remote
monitoring, and web attractions, to provide live audio and video in a monitored 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 other clients.
Audio Input
Audio from an external microphone or a line source can be connected to the Line/Mic In
jack of the AXIS 243SA. 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 69 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. DC power
will not harm the microphone, but if you are uncertain, try switching it off and on. DC
power is enabled by default. 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, it is possible to adjust the
input gain for the microphone attached to the AXIS 243SA.
Select the desired audio Encoding format, G711, and G726.