Vivotek NR7401 Bedienungsanleitung PDF herunterladen (Seite 7)

Chap.1 IP Surveillance Overview

A network camera mainly consists of a lens, an image sensor, an image processor, a video compression SoC

(System on Chip) and an Ethernet chip that offers network connectivity for data transmission (Figure 1.2).

When light passes through the lens to the sensor, it is converted to digital signals and then processed by a built-in

digital signal processor. The processed video data is then compressed by a multimedia SoC to achieve a smaller

data size for optimal transmission. Finally, the video images are sent through the Internet to back-end devices to

allow for viewing and storage. Apart from video compression, the SoC is built with a RISC CPU for processing

system and network data.

The general interface of a network camera includes a power cord socket, an Ethernet socket, audio I/O ports and

digital I/O ports (Figure 1.3).

Router

Lens

Image

Sensor

DSP for Image

Processing

SoC for

Video/audio

Compression

Flash

ROM

DRAM

WLAN or

Ethernet/PoE

LAN/Internet

Power Cord

Socket

Ethernet 10/100

RJ45 Socket

Indented Reset

Button

General I/O

Terminal Block

Audio Out

External/Internal

MIC Switch

Microphone In

Status LED

SD/SDHC

Card Slot

Figure 1.3 General interface of network camera

Figure 1.2 Network camera composition

Figure 1.1 Network camera connection

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