Technical Publications

September 26, 2011

HOW TO MAKE MAXIMUM USE OF YOUR SDI SIGNAL

The CCTV industry has begun to use a new type of digital High Definition camera referred to as HD CCTV that has an SDI (Serial Digital Interface) output. There are multiple manufacturers of this type of digital camera and they are very price competitive with

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sdi ptz sdi remote control

June 10, 2011

WHY ARE MY PICTURES FUZZY ON LONG CABLE RUNS?

The culprit is the cable connecting the Camera to the Recorder. It is just that simple, but an actual description of the process that introduces this loss is a little more complex. This loss of picture detail or picture fuzziness is actually caused by four

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June 4, 2011

AUDIO DE-EMPHASIS RESPONSE TABLE

In the transmission of FM modulation there is more noise at the higher audio frequencies than there is at the lower audio frequencies. To compensate for this unbalance and make the noise more uniform over the audio spectrum, the Broadcasting industry developed some standards for

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audio de-emphasis audio pre-emphasis audio volume meter avm emphasis

June 4, 2011

HOW TO GROW YOUR BUISINESS IN A DOWN ECONOMY

When I ask them what they are doing to boost their sales, some say they are just doing a lot more of the usual sales activities, but complain that it is not delivering the level of sales they need. Others I have spoken to have

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grow your business

June 1, 2011

Checking Laptops for Real-Time Audio and Video Capability

A recording engineer friend recommended a free utility called “DPC Latency Checker” that you can download from www.thesycon.de/deu/latency_check.shtml. It shows delays due to improper device driver handling of Deferred Procedure Calls on Windows machines, to check if your computer is suitable for real-time audio or

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checking laptops real-time audio

March 14, 2011

HOW TO DETECT CAMERA TAMPERING IN REAL TIME

When you discover tampering in a CCTV security system it normally occurs at the most vulnerable and exposed part of the system, the video camera. Normally the camera is mounted outside of the security of locked rooms and under the eye of the public. There

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camera guard camera tampering cg-4 tssa

January 10, 2011

MOBILE VIDEO SWITCHING APPLICATIONS

This article discusses several applications where the VS-12 is used to enhance the operation of a mobile video system. The first case involves a horse trailer used to transport horses. The customer has a rear facing video camera for back-up assistance and a camera mounted

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video a/b relay video a/b switch video relay video switch vs-12

December 16, 2010

SUPERVISORY CONTROL ON DIGITAL TV

The age of digital broadcasting is here, and with it comes a new set of problems and solutions. Before the digital revolution many broadcasters used the Vertical Interval of the analog NTSC video signal for "Supervisory Control" to transmit information used to control equipment and

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audio relay control remote control audio

December 16, 2010

WHAT YOU CAN DO ABOUT LIGHTNING STRIKES

Protecting a CCTV system and it components from lightning damage does not use the same methods used to protect human life from electrical shock. In fact many of the techniques used to protect humans from lightning also cause some other problems in the CCTV system.

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bonding lightning CCTV lightning protection

December 16, 2010

VIDEO PRE AND DE-EMPHASIS IN TRANSMISSION, WHY IS IT USED?

Video Pre-Emphasis and De-Emphasis is used with Frequency Modulation (FM) transmission systems. It is used to offset the triangular noise distribution created by FM transmission systems. FM Fiber, Satellite and microwave transmission systems exhibit this kind of triangular noise pattern.

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video de-emphasis video emphasis filter video pre-emphasis

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