Wisenet XNV-6083Z, Online Help Manual

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Audio setup
You can connect a microphone and speaker to a network camera and listen to the sound at a remote location where
the camera is installed, or output audio from the camera to the location. When you complete the setting, click the
[Apply] button at the bottom of the page.
Audio in
You can input audio into an image through a microphone connected to the camera.
Input audio by selecting a source that fits the usage environment.
Source
Select an audio input type. (Supported options may vary depending on camera
specifications.)
Internal microphone: This is the internal microphone included with the camera.
External microphone: An external microphone can be connected to the camera and
used instead of the internal microphone. When you select [Apply power to Ext. Mic.],
the camera supplies power to an external microphone.
Line: Connect to sound equipment through a cable. For example, connect sound
equipment such as an MP3 player and a camera through a cable, and select the
MP3 player when you input recorded audio from it into the camera.
Codec
Select an audio codec. (Supported options may vary depending on camera
specifications.)
G.711: This is the standard audio codec for ITU-T, which is mainly used in telephone
communication; the audio quality is low. It is also called the pulse code modulation
of sound frequency; soundwaves can be delivered digitally in PSTN or through PBX.
G.726: This is the standard audio codec for ITU-T, which is mainly used in telephone
communication; the audio quality is low. It is possible to change and compress 64
Kbps PCM to 16, 24, 32 or 40 Kbps through Adaptive Differential Pulse Code
Modulation (ADPCM).
AAC: AAC (Advanced Audio Coding) is the international standard that succeeds
MP3. It is more efficient than MP3 and has sound quality similar to an original copy
of a CD. AAC enables the use of audio of a higher sampling rate than is the case
when using the previous G.711 and G.726 codecs.
Sampling rate
This refers to the number of samplings per second when an analog sound source is
converted to a digital sound source; as this value is higher, the sound quality is better.
The sampling rate is fixed for each audio codec, and cannot be changed by the user.
The sampling rate of the G.711 and G.726 codecs is 8 KHz, while the sampling rate of
the AAC codec is 16 KHz. (Supported [Codec] options may differ depending on the
camera specifications.)