Digital Video Recorders and Network Video Recorders – save, store and playback.

A Digital Video Recorder (DVR) is a peripheral device that records information to a variety of storage devices (internal or external hard drive, USB port, a CD or DVD, etc.), digitally, from many sources. Some DVRs only record video but most will record both video and audio as well as other information (such as alarm functions). A DVR provides many advanced functions over the older standard - the VCR. These functions include video searches by an event, the specific time, a specific date and by each individual camera.

With a DVR there are many different video quality and frame rate options so that the user can optimize the disk space for their specific needs. DVRs can be set to automatically overwrite the oldest footage on the disk when the disk becomes full so that recording does not cease just because the internal hard drive has no more space. Most new-model DVRs will also allow the user to set up remote access to the security footage that can be called up over a web browser from any PC. Software packages are starting to come put now that even allows users to call up their DVRs right on their cell phones.

An NVR, on the other hand, is a Network Video Recorder which is hooked up directly to a network and is totally IP based. NVRs are extremely flexible since they are managed remotely over a LAN and they can simultaneously record and allow access to live video streams from the IP cameras connected to it. NVRs usually feature recording and playback capabilities, intelligent motion detection, P/T/Z camera control and a user-friendly GUI.

A NVR has some similarities to a DVR, but those similarities are limited to the fact that they both record and playback video. An NVR is a true digital system. NVRs receive digital images/video/audio over the network and record them digitally to a hard drive; while DVRs can accommodate both digital and analog cameras.

NVRs are becoming the more popular storage device because they can accommodate a larger number of cameras, they are easily integrated into existing systems, and they are incredibly flexible since they have no dedicated monitors or keyboards and all management and viewing takes place over the network on a PC.

WTI offers a wide variety of both NVRs and DVRs – check out our selection online at http://www.gotowti.com/Products_DVRs.htm or take a look at our entire line of solutions at http://www.gotowti.com/Products_Main.htm.

~The WTI Team

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WTI (Wireless Technology, Inc.)

Video Surveillance Products Dedicated to the Broadcast, Global Security and Transportation Markets!

www.gotowti.com ● www.wirelesstech.com

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The Digital Video Transition

Now that the Government has finally mandated and implemented the conversion from analog video to digital video, the security industry is finally going to progress at warp speed in unleashing a storm of new and exciting, and yes user-friendly, products that take full advantage of this technology. There is zero reason to be even thinking Analog anymore! Analog video has served us well but it is time to move on! Personally, I thought that by now the industry would be much further along the digital path that it has.

MPEG H.264/AVC is the latest and greatest compression technology. The purpose of H.264/AVC is to create a new standard which is capable of providing good quality (D1) performance at much lower bit rates that the previous standards. This new standard uses half or less the bit rate of MPEG-2, H.263, or MPEG-4 Part 2. The nice thing about H.264 from the technical standpoint is that it doesn’t increase the complexity of the design very much and it will not be overly expensive to implement from both the hardware and software sides if the isle. An additional and very important aspect of H.264 is the fact that will provide enough flexibility that will allow it to be used in a variety of network applications with the ability to scale both high and low bit rates depending on the application. Both the Blu-ray Disc format and the now-discontinued HD-DVD format include the H.264/AVC high profile as one of 3 mandatory video compression codecs. Sony has also chosen this format for their memory stick video format.


An early version of WTI’s MG400 MPEG Codec from the year 2002 – It was big and it was slow!



WTI’s current Video Encoder: It’s Small and fast and scalable!

For more information on WTI’s C-MAX Ultra Video IP Encoder and Video Server, check it out on our web site at http://www.wtipower.com/Products_UltraVideoEncoder.htm.

~Dan Fancher, President/C.E.O.



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WTI (Wireless Technology, Inc.)

Video Surveillance Products Dedicated to the Broadcast, Global Security and Transportation Markets!

www.gotowti.com ● www.wirelesstech.com

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