Videoswitch Vi200, Руководство пользователя

Страница: 29 / 55

Digital Recorder
23
9.2.2 Cameras
Select here which cameras you wish to record when there is no activity or alarm in progress.
Typically, all cameras would be selected.
9.2.3 Quality
Select the image quality here. Note that the quality (i.e. image size) affects the record rate
for a given number of days recording. Image quality may be adjusted to suit the particular
installation. Note that:
•
Higher quality images result in fewer images per second
•
Lower quality images result in more images per second
The actual size of the stored image in (Kbytes) depends on the content of the image.
Scenes with a lot of information result in larger images. Scenes with little information (e.g.
empty rooms), result in smaller images. The use of variable image size maximises the use
of the available hard drive capacity.
9.2.3.1 Audio Sensitivity
This option sets the sensitivity of the record input. It should be set as high as possible
before the onset of clipping (distortion) of the audio is apparent.
•
If the audio is distorting even at minimum sensitivity, then the signal level being fed
in is too high and should be reduced.
•
If the audio is weak and noisy, the input level may be too low and should be
increased. If the microphone input shows these symptoms, and external
microphone pre-amplifier may be needed.