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AXIS P1357–E Network Camera
Video and Audio
Audio Input
An external microphone or a line source can be connected to the Audio-in connector. Congure the audio input settings under Video
& Audio > Audio Settings.
Note
The internal microphone is used by default; the external microphone is used when connected. It is possible to disable the
internal microphone by connecting a plug to the mic input.
Note
When used in an outdoor enclosure, the internal microphone on this Axis product cannot be used.
Select Microphone to use an external microphone or Line to use a Line in device, e.g. an audio mixer for multiple microphones
or a microphone with a built-in amplier, as audio source.
To use a professional microphone requiring 48V phantom power, you need an external power supply and a balanced-unbalanced
converter (audio transformer) in between.
The Microphone power option provides DC power for an external microphone. Microphone power should only be used with
microphones that have no battery and when using the internal microphone. 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.
Use the Input gain to control the volume of the audio input. If the sound is too low, choose a higher dB value, to amplify the
sound. If the sound is too high, choose a lower dB value. 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.
Use the Encoding option to 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 is an unlicensed standard codec that is useful when integrating audio into a VoIP system
• G726 is an unlicensed speech codec that is most commonly used within the security industry.
• Opus is an unlicensed codec that is used for interactive real-time audio transmission over network.
Note
If recording audio to edge storage, such as an SD card or network share, use AAC encoding.
The Sample rate denes 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.
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 Audio-out connector (a built-in amplier is required for this). The output can be
connected to another amplier with speakers. A stereo connector must be used for the audio out.
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