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40
Figure 4-22 ROI
Step 5 Click
Apply
.
4.3.4 Configuring Audio
You can configure audio parameters and alarm audio.
4.3.4.1 Setting Audio Parameters
This section introduces audio parameters, including encode mode, sampling frequency, audio in
type, and noise filter.
Step 1 Select >
Camera
>
Audio
>
Audio
.
Step 2 Click next to
Enable
in
Main Stream
or
Sub Stream
.
Please carefully activate the audio acquisition function according to the actual
requirements of the application scenario.
Step 3 Configure audio parameters.
Table 4-13 Description of audio parameters
Parameter Description
Audio Input Type
You can select audio input type from:
●
LineIn
: Requires external audio device.
●
Mic
: Not require external audio device.
Audio Encoding
You can select audio encode mode from
PCM
,
G.711A
,
G.711Mu
, and
AAC
.
The configured audio encode mode applies to audio and intercom.
You are recommended to use the default mode.
Sampling Frequency
Sampling number per second. The higher the sampling frequency is,
the more the sample in a second will be, and the more accuracy the
restored signal will be.
Noise Filter Enable this function, and the system auto filters ambient noise.
Microphone Volume Adjusts microphone volume.
Speaker Volume Adjusts speaker volume.
Step 4 Click
Apply
.
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