Security cameras capture and transmit images, but the way they do this depends on whether they are analog or digital.
Analog Security Cameras
Analog security cameras function by:
- Recording Images: Capturing visual information.
- Signal Transmission: Sending the recorded image as an analog signal.
- Coaxial Cable: Transmitting the analog signal over a coaxial cable to a DVR.
Digital Security Cameras
Digital security cameras function by:
- Recording Images: Capturing visual information.
- Digital Recording: Recording the images digitally.
- IP-Based CCTV Systems: Using IP-based closed-circuit television systems.
Digital Video Recorder (DVR)
According to the provided reference, a DVR plays a crucial role in analog systems:
- Analog-to-Digital Conversion: The DVR converts the analog video signal into a digital signal.
- File Compression: The DVR compresses the digital file to reduce its size.
- Storage: The DVR stores the compressed digital file on a hard drive for later viewing.
Summary Table: Analog vs Digital Security Cameras
| Feature | Analog Security Cameras | Digital Security Cameras |
|---|---|---|
| Signal Type | Analog | Digital |
| Transmission | Coaxial Cable to DVR | IP-Based CCTV Systems |
| Digital Conversion | DVR converts to digital, compresses, and stores | Records images digitally |
| Key Component | DVR (Digital Video Recorder) | Network Video Recorder (NVR) often used |
| Image Quality | Generally lower resolution compared to digital | Typically higher resolution than analog |
| Cabling | Typically requires separate power and video cables | Can use Ethernet cables with Power over Ethernet (PoE) |
