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AXIS P7214 Video Encoder
Video and Audio
Full duplex - Simultaneous two-way audio allowing the Axis prod uct 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
AMC A udio Controls, on page 9
.
Simplex — speaker only - Audio is transmitted from a client to the A xis product and c an be played by a speaker connected
to the product. To transmit a udio using the Live View page, the Talk and Microphone buttons must both be active, see
AMC
Audio Contro ls, on page 9
.
Simplex — microphone only - Audio captured by the product microphone is transmitted from the Axis product to one o r more clients.
To set the audio m ode, go to Video & Audio > Audio Settings and s elect 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 o ption provides DC power f or 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. Microp hone pow er will not harm the micro phone; if y ou are uncertain, try sw itching it off and o n. To use a
professional microphone requiring 48V phantom power, you need an external power supply and a balanced-unbalanced converter
(audio transformer) in betw e en.
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 representati
on 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 for
mat.
• 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 priori ty, AAC is the r ecomm ended codec to use. A n AAC license
is included in the A xis product.
• G711
• G726
Sample rate - The number of times per second the sound is sampled. A hig her sample rate w ill 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 lo we r bit
rate may have latency or delay, but w ill require less bandwidth.
For m ore 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 amplifi er with speakers. A stereo connector m ust be used for the audio out.
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