Sony SNC-RZ25N - Network Camera Каталог - Страница 6

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Network Technologies

Adaptive Rate Control (ARC)

ARC is a feature that adjusts the compression bit rate and

the frame rate of MPEG-4 data in order to meet changing

traffic conditions over a network. Round Trip Time (RTT)

and actual IP packet loss are both monitored to determine

traffic conditions, and the bit rate and frame rate are

adjusted automatically.

"Drop Outs" (a breakup in

transmitted images) can be avoided when a system is

equipped with the ARC feature. The following is a

graphical representation of how ARC works:

GOV

Without

Drop Out

ARC

30 fps

0 fps

Available Network Bandwidth

Without an ARC feature, as the available network

bandwidth is reduced due to high-traffic conditions, "Drop

Outs" occur.

With ARC

(bit rate

reduction)

30 fps

Available Network Bandwidth

With ARC, as the available network bandwidth is reduced

due to high-traffic conditions, the MPEG-4 data bit rate is

reduced. This lowers image resolution slightly, but smooth

moving images are still transferred.

With ARC

(frame rate

reduction)

30 fps

15 fps

Available Network Bandwidth

If network traffic conditions continue to increase, then the

ARC feature lowers the frame rate of the data so that

dropouts do not occur and a continuous image stream is

transferred. This method still provides smooth moving

images at a lower frame rate.

30 fps