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A/V interface suits advanced security systems

Posted: 03 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:interface A/V? systems security? surveillance video?

Enabling equipment manufacturers to leverage existing coaxial cable infrastructures, Gennum Corp. has developed a new audio video (A/V) interface for professional and industrial applications such as advanced video security and surveillance systems.

Advanced Video Interface for Industrial Applications (Aviia) is a robust interface for HD video over coaxial cable lengths up to 100m. This allows users to upgrade their existing analog over coaxial systems, the dominant technology implemented in surveillance systems today, to full bandwidth HD video, up to 1,080 lines progressive.

The new interface expands Gennum's A/V technology into new markets including video surveillance, machine vision, medical, digital signage, passenger infotainment, industrial imaging and video conferencing.

Today, most CCTV systems used in video surveillance applications use coaxial cable, which until now, has been unable to support the high resolutions of HD. As a result, users have either maintained their analog systems with lower video resolutions or have resorted to costly infrastructure changes to Ethernet-based networks. By using Cat-5 cable to bring HD video into their environments, the network systems compromise the video immediately by compressing video in the camera for transmission over the network. In addition to incurring the obvious infrastructure costs, there are significant security concerns such as hacking, bandwidth availability and down-time typically experienced with a network-based approach, which has made an HD-over-coax option desirable but, to date, unattainable.

"With millions of miles of coaxial cables installed, many users want to upgrade their surveillance video applications to HD video, but are hindered by the expense and disruption associated with an infrastructure change," said Martin Rofheart, senior VP and general manager of analog and mixed-signal products at Gennum.

Gennum said the Aviia interface and accompanying suite of products can be easily integrated into the architecture of digital video equipment such as cameras, monitors and digital video recorders (DVRs). Featuring transmit and receive functions to enable bi-directional transmission, the Aviia solutions create a new I/O that enables equipment manufacturers to provide their customers with a cost-effective, high-quality HD product capable of transmitting across coaxial cables. Moreover, the use of this interface ensures that the HD stream from source (camera) to destination (DVR, monitor etc.) is transmitted at full bandwidth with no video compression needed. According to IMS Research, the worldwide video surveillance market is forecast to be worth $9.5 billion in 2009, growing to an estimated $14.3 billion in 2012.

Growing market
"The global market for video surveillance equipment is expected to grow well beyond 2012, with the highest growth coming from China, Latin America and Eastern Europe," said Alastair Hayfield, market analyst at IMS. "The megapixel camera market is a rapidly growing segment of the total camera market with high double-digit revenue growth forecast beyond 2012. The improved image resolution that megapixel and HD surveillance brings is appealing to a wide range of verticals where better object detection or person recognition is a much sought after commodity."

"Physical security demands video resolutions beyond D1 without incurring significant increases in system price and without compromising the evidentiary norms built up around DVRs," said Todd Rockoff, VP for global sales of the ODM business unit of EverFocus, a Taiwan-based manufacturer of physical security equipment. "We see tremendous latent demand for HD CCTV that plugs in directly to the large installed base of coaxial cable. HD CCTV promises to deliver high-resolution far more conveniently and inexpensively than IP Cameras. EverFocus expects hybrid DVRs, accepting both SD and uncompressed HD TV signals over coax enabled by Aviia, to become a high-growth product category."

According to Gennum, they applied their advanced Serdes technology to achieve an end-to-end upgrade path for HD video transmission over 100m+ of coaxial cable. Currently, Gennum is delivering 100m coaxial solutions with its ActiveConnect product, which is being used in custom home theater applications to provide a low-cost, long reach HDMI interface solution.

Various video formats supported
Gennum's new Aviia suite of products delivers an innovative high-bandwidth, all-digital, long-reach A/V interface for professional and industrial applications. Integrating into existing digital architectures, the products provide HD video; digital audio; bi-directional control such as pan-tilt-zoom and camera configuration over a single-wire, delivering a robust and cost-effective interface. The Aviia suite also provides for power over the coaxial cable itself, operating at 3-25Vdc up to 25W.

Specifically, Gennum's Aviia suite includes the GV7500/01 Aviia SD transmitter/receiver; the GV7600/05 Aviia transmitter/receiver (supports both standard definition or SD and HD video) and the GV7601 Aviia receiver (SD and HD support with integrated cable equalizer technology).

With support for 720p, 1,080i and 1,080p video formats, as well as 525i and 625i (D1) video, the new Aviia solutions enable HD video to be transmitted without the use of in-camera compression, providing an improved operator experience and higher quality evidence in surveillance systems. Providing a single 75 coaxial bi-directional multimedia interface, the new suite of products can provide link bandwidth up to 3Gbit/s downstream and can support up to 8 channels of linear PCM audio at 48kHz sampling. Additionally, Aviia solutions provide support for 6Mbit/s auxiliary data channel for applications such as up-the-cable control, "intercom" audio back channel, and remote status and monitoring.

A complete reference design for the HD over coaxial cable solution will be available from Gennum in April. The GV7600/05 HD devices are available now in high volume and are priced at $7.56 each in quantities of 10,000/month. The GV7601 receiver will be available in September.

- Cliff Roth
Video Imaging DesignLine

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