AHD (Analog High Definition) cameras are a popular choice for surveillance systems, offering high-quality video over traditional coaxial cables. But how does an AHD camera work, and what makes it different from other analog or IP cameras? In this article, we’ll explore the AHD camera working principle, supported resolutions, transmission distance, signal format, and the best coaxial cables for optimal performance.
Understanding the AHD Camera Working Principle
AHD cameras transmit high-definition video signals using analog technology, making them a cost-effective alternative to IP cameras. The AHD camera working principle relies on advanced signal processing to deliver clear, lag-free video without requiring expensive network infrastructure.
Unlike traditional analog cameras that use CVBS (Composite Video Blanking Sync) signals, AHD cameras utilize a modulated signal that carries higher-resolution video data. The camera’s sensor captures the footage, processes it digitally, and then converts it into an analog signal for transmission over coaxial cable.
At the receiving end (usually a DVR), the analog signal is converted back into a digital format for storage and display. This hybrid approach allows AHD cameras to support HD resolutions while maintaining compatibility with existing coaxial cabling.
What Resolution Does AHD Support?
One of the key advantages of AHD cameras is their ability to support high-definition resolutions. Depending on the version, AHD supports the following resolutions:
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AHD 1.0: 720p (1280×720) at 30fps
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AHD 2.0: 1080p (1920×1080) at 30fps
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AHD 3.0: 4MP (2560×1440) at 20fps
These resolutions provide significantly sharper images compared to standard analog cameras (which typically max out at 720×576 pixels). The higher resolution makes AHD cameras ideal for applications where detail is crucial, such as license plate recognition or facial identification.
Know more
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AHD Camera Transmission Distance
The AHD camera transmission distance depends on the quality of the coaxial cable and the resolution being used. Generally, AHD signals can travel up to:
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500 meters (1640 feet) at 720p
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300 meters (984 feet) at 1080p
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150 meters (492 feet) at 4MP
Beyond these distances, signal degradation may occur, leading to reduced video quality. To extend the range, signal amplifiers or higher-quality coaxial cables can be used.
AHD Signal Format and Compatibility
The AHD signal format is designed to be backward-compatible with older analog systems. This means that AHD cameras can work with existing coaxial cabling, BNC connectors, and even some older DVRs (though higher resolutions may require an AHD-compatible DVR).
AHD uses frequency modulation to transmit video signals, minimizing interference and ensuring stable performance. Unlike IP cameras, which compress and packetize video data, AHD cameras send uncompressed analog signals, reducing latency and eliminating the need for complex network configurations.
Best Coaxial Cable for AHD Camera
To maximize performance, choosing the right coaxial cable for AHD camera installations is essential. The most commonly used types are:
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RG59: Suitable for short to medium distances (up to 300 meters for 1080p).
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RG6: Offers better shielding and lower signal loss, ideal for longer runs (up to 500 meters for 720p).
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Siamese Cable: Combines coaxial and power cables for simplified installation.
Using high-quality, pure copper coaxial cables ensures minimal signal loss and better video clarity. Avoid CCA (Copper-Clad Aluminum) cables, as they can degrade signal quality over long distances.
Conclusion
AHD cameras provide an excellent balance between high-definition video quality and cost-effective installation. By understanding the AHD camera working principle, supported resolutions, transmission limits, and the best coaxial cables, you can optimize your surveillance system for superior performance.
Whether upgrading an existing analog system or deploying a new setup, AHD cameras offer a reliable and budget-friendly solution for high-quality video surveillance. With their extended AHD camera transmission distance and compatibility with legacy infrastructure, they remain a top choice for security professionals and DIY installers alike.