Front End I News


Vision systems look to become proactive ‘virtual’ guards


Traditionally vision systems are used to either record a crime as an aid to prosecution or to alert on-site security guards, or off-site police, to a break-in or act of vandalism. The time between incident and intervention can be significant and doesn’t change the fact that a crime has already occurred. According to the UK’s West Midlands’ Police Force, its response time for priority calls is anything up to an hour.


Advances in image quality, computer


processing capabilities, internet connection speeds and video analysis algorithms are, however, beginning to enable remote systems that can detect a likely event and intervene to prevent a break-in from occurring in the first place. This real-time off-site video surveillance technology not only speeds up the dispatch of security service but helps to eliminate false alarms and to prioritise response priorities.


The Dutch security vision systems manufacturer, The Pebble Group, has created the Crime Buster system, a proactive security system for use outside a building or compound that uses Sony’s FCB-EX985E/P, a high-resolution, wide-


room who is trained to intervene and de- escalate the situation. Video and audio is streamed over an IP network.


Acting like a “virtual


guard” operators are specialists who watch cameras and respond immediately to any suspicious activity. These snapshots of live events can be e-mailed to security guards as events unfold in real-time.


angle camera for use in low light conditions, with integrated infrared illumination and integrated audio for remote intervention. Incidents are detected automatically using Pebble’s proprietary algorithms running on images outputted from a statically mounted camera. Upon detecting a likely intrusion the system alerts an operator in a remotely located control


Link Microtek wins major order for filters to prevent TV interference from 4G signals


Link Microtek has secured a significant order to protect TV channels on Freeview from interference when next-generation mobile phone networks are rolled out across the UK later this year. The order covers several types of mitigation filter, which will be used to prevent the new 4G LTE signal at 800MHz from affecting digital terrestrial TV reception.


Link Microtek expects to deliver the first wave of filters in early April to Digital Mobile Spectrum Ltd (DMSL), a company jointly owned by the 4G 800MHz licensees: EE, Telefónica UK (O2), Three and Vodafone. Sales Director Stuart Hendry said: “The


order is a major boost to our business and underlines our position as a premier supplier of RF/microwave


Stuart Hendry 6 April 2013 Components in Electronics


components, systems and instrumentation. As well as providing simple filters that individual consumers can easily attach to the back of their TV, we are also supplying larger filter units for professional installation into premises with a shared aerial.” With other European countries also likely to be affected by this interference issue, Link Microtek said that it would be looking at a number of significant business opportunities over the coming months.


MPE starts shipping ground- breaking MIL-STD single-line 1200A HEMP filters


MPE has begun shipping what are believed to be the world' first single-line, 1200A- rated High-Altitude Electromagnetic Pulse (HEMP) filters fully compliant with the 10A residual let-through current requirement of MIL-STD-188-125 Parts 1 and 2. Incorporating MPE’s proprietary 1200A feed-through capacitors for high performance to beyond 10GHz, these new 1200A filters have been designed for the HEMP protection of power cables in critical infrastructure installations. Models are available optimised for the 277/480V AC supply in the USA and 250/440V AC in Europe and other regions. The feedthrough capacitors contain


proprietary self-healing, metallised plastic film capacitor material and utilise a solderless capacitor assembly technique to avoid heat damage.


These new MPE powerline filters consist of a single 1200A circuit with no current- sharing elements, avoiding the problems inherent in high-current filters that are based on the paralleling of multiple lower current filters. The paralleling of filters


“We use a static camera for the initial detection as this eliminates the possibility of a criminal hiding in a moving camera’s blind spot, and we use a motorised version of the Crime Buster, connected through IP to the static cameras, as a remote guarding system. The total system follows our DVRI process of detection, verification and remote intervention,” said Pascal Broers, business development manager at Pebble. “This means that we need both an exceptional image quality and exceptional field of view. The system’s camera delivers both and allows the Crime Buster to function as an extension of a control room operator, letting him to act as if he were an on-site security guard and scare off the perpetrator by remote intervention.”


The FCB-EX985E/P uses an interlaced


scan π-type Super HAD CCD II sensor to deliver high resolution images to a digital output. The camera module includes a 28x zoom lens and incorporates Sony’s StableZoom technology.


After a year in development the system is now undergoing beta testing with Pebble’s clients and is expected to be launched onto the market in 2013.


commonly leads to overheating and filter failures due to current imbalances. Where a series of filters are connected in parallel, a slight mismatch in the resistance of filters will cause an imbalance in current. As an example, even a 10% difference in the resistance of filters will result in a 10% current overload in the filter with the lowest resistance. As filter temperature rise is a well- known factor affecting lifetime and reliability, the MPE filters also utilise a design that ensures a low internal temperature rise of capacitor elements, inductors and current-carrying busbars.


The newly launched filters have been independently tested and certified for the early-time E1 pulse in MIL-STD-188-125 by the US Department of Defense (DoD) contractor Jaxon Engineering & Maintenance of Colorado Springs. For both MPE’s 250/440V AC and 277/480V AC models, Jaxon measured an E1 pulse’s residual current waveforms. They fell well below the limits stated in the MIL-STD for their maximum peak, derivative and root action at seven different pulse current injection (PCI) levels, ranging from 50A to 2500A.


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