User manual

AXIS P7210 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 8

Simplex — speaker only - Audio is transmitted from a client to the Axis product and can be played by a sp eaker connected

to the product. To transmit audio using the Live View page, the Talk and Microphone buttons must both be active, see

AMC

Audio Contro ls, on page 8

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. Co nﬁg u re the audio input se ttings

under Video & A udio > 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 pow er

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 micro phone; if you are uncertain, try s w itching 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 betw e en.

Input gain - Control the volume (dB Full Scale) of the audio input. If the sound is to o 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. An AAC license

is included in the A xis product.

• G711

• G726

Sample rate - The number of times per second the sound is sampled. A higher sample r ate will provide b ette r audio quality, but

also requires a greater bandwidth.

Bit rate - Set the required bit rate depending on the selected encoding. A highe r bit rate wil l give bette r audio qua lity. A lower 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 must be used for the audio out.