Axis P7214 User Manual page 19

AXIS P7214 Video Encoder
Video and Audio
Full duplex - Simultaneous two-way audio allowing the Axis product to transmit and receive audio at the same time. There is no
echo cancellation; if feedback loops appear, try moving the microphone or the speaker.
Half-duplex - Audio can be transmitted to and from the Axis product but only in one direction at a time. To transmit audio using the
Live View page, use the Talk and Listen buttons, see
Simplex — speaker only - Audio is transmitted from a client to the Axis product and can be played by a speaker connected
to the product. To transmit audio using the Live View page, the Talk and Microphone buttons must both be active, see
Audio Controls, on page 9
Simplex — microphone only - Audio captured by the product microphone is transmitted from the Axis product to one or more clients.
To set the audio mode, go to Video & Audio > Audio Settings and select the desired mode from the Audio mode drop-down list.
Audio Input
An external microphone or a line source can be connected to the product's Audio-in connector. Configure the audio input settings
under Video & Audio > Audio Settings.
Source - Select Microphone for an external microphone or Line for a Line in device, e.g. an audio mixer for multiple microphones or
a microphone with a built-in amplifier.
Microphone power - The Enable microphone power option provides DC power for an external microphone. Microphone power
should only be used with microphones that have no battery. This setting should not be enabled when using a dynamic or battery
powered microphone. Microphone power will not harm the microphone; if you are uncertain, try switching it off and on. To use a
professional microphone requiring 48V phantom power, you need an external power supply and a balanced-unbalanced converter
(audio transformer) in between.
Input gain - Control the volume (dB Full Scale) of the audio input. If the sound is too low, choose a higher dB, to amplify the
sound. If the sound is too high, choose a lower dB. The Level bar gives a visual representation of the audio signal level in dB
relative to the full-scale input level.
• Green — the signal is at a good level.
• Yellow — the signal is becoming distorted.
• Red — the signal is distorted.
Encoding - Select digital audio encoding format.
• AAC requires a license for both encoding and decoding. AAC is the least complicated and most widely used codec.
If achieving the best possible audio quality is a priority, AAC is the recommended codec to use. An AAC license
is included in the Axis product.
G711
•
• G726
Sample rate - The number of times per second the sound is sampled. A higher sample rate will provide better audio quality, but
also requires a greater bandwidth.
Bit rate - Set the required bit rate depending on the selected encoding. A higher bit rate will give better audio quality. A lower bit
rate may have latency or delay, but will require less bandwidth.
For more information about these settings, please see the online help
Audio Output
An external speaker can be connected to the product's Audio-out connector (a built-in amplifier is required for this). The output can
be connected to another amplifier with speakers. A stereo connector must be used for the audio out.
AMC Audio Controls, on page 9
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AMC