August 26, 2009

Legalities of audio recording

Recording audio in conjunction with video can make a huge difference in the value of the video. Audio recording could be used as evidence in employee misconduct investigations, insurance liability claims or even criminal trials. However, there are state and federal laws that must be considered when recording audio. Not properly following these laws can […]
August 14, 2009

H.264 Video Compression

Anyone who has been researching video surveillance has definitely heard of H.264. H.264 is a video compression standard that provides the most efficient video compression techniques available today without compromising image quality. An H.264 encoder can compress the size of a digital video file by more than 80% compared with the MJPEG format and as […]
August 11, 2009


At the heart of every digital camera in the world there is an image sensor. The image sensor converts light into a digital signal. There are two basic types of image sensors in use today. There are CCD (Charged Coupled Devices) and CMOS (Complementary Metal Oxide Semiconductor) sensors. Each type of image sensor has its […]
August 7, 2009

The Basics of RS485 and PTZ Control

Almost every DVR has the ability to control a multitude of devices using the RS485 protocol. RS485 uses 2 wires to send and receive data to and from these devices. All the devices in an RS485 “network” are connected in parallel with one another. This is a very simple form of communication and relies mainly […]
August 7, 2009

CCTV Lens Technology

One of the main considerations when installing a security surveillance system is the lens.  Without lenses, the system would be useless.  Most cameras come with a choice of lenses, while box type security cameras require you to choose the lens and purchase it separately. When choosing a lens, there are a few things to keep […]