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Encyclopedia > Digital video recorder
Foxtel IQ, a digital video recorder and a satellite cable set-top box.

A digital video recorder (DVR) or personal video recorder (PVR) is a device that records video in a digital format to a disk drive or other medium. The term includes stand-alone set-top boxes and software for personal computers which enables video capture and playback to and from disk. Some consumer electronic manufacturers have started to offer televisions with DVR hardware and software built in to the television itself. It has also become the main way for CCTV companies to record their surveillance, as it provides far longer recording times than the previously used VCRs. Image File history File linksMetadata Download high-resolution version (2771x591, 259 KB) Foxtel iQ satellite set top unit. ... Image File history File linksMetadata Download high-resolution version (2771x591, 259 KB) Foxtel iQ satellite set top unit. ... Foxtel is a cable television and satellite television company in Australia, formed through a joint venture between Telstra and News Corporation. ... The term set-top box (STB) describes a device that connects to a television and some external source of signal, and turns the signal into content then displayed on the screen. ... Disk Drive is the afternoon show on CBC Radio Two. ... Closed-circuit cameras are often used to discourage crime Closed-circuit television (CCTV), as a collection surveillance cameras doing video surveillance, is the use of television cameras for surveillance. ... The videocassette recorder (or VCR, more commonly known in the British Isles as the video recorder), is a type of video tape recorder that uses removable videotape cassettes containing magnetic tape to record audio and video from a television broadcast so it can be played back later. ...

Contents

History

The technological underpinnings of hard-disk based video recorders were tested on July 8, 1965, when CBS explored the possibilities of instant freeze-frame and rewind for sports broadcasts. Ampex released the first commercial hard disk video recorder in 1967. The HS-100 recorded composite analog video onto a 14" diameter hard disk using Frequency modulation. It could store a maximum of only 30 seconds[1], but could record continuously, and play back 2x normal speed down to still frame. is the 189th day of the year (190th in leap years) in the Gregorian calendar. ... Year 1965 (MCMLXV) was a common year starting on Friday (link will display full calendar) of the 1965 Gregorian calendar. ... CBS Broadcasting, Inc. ... Ampex is based in Redwood City, California. ... Frequency modulation (FM) is a form of modulation that represents information as variations in the instantaneous frequency of a carrier wave. ...


In 1985, an employee of Honeywell’s Physical Sciences Center, David Rafner, first described a drive-based DVR designed for home TV recording, time-slipping, and commercial skipping. U.S. Patent 4,972,396  focused on a multi-channel design to allow simultaneous independent recording and playback. Broadly anticipating future DVR developments, it describes possible applications such as streaming compression, editing, captioning, multi-channel security monitoring, military sensor platforms, and remotely piloted vehicles.


Hard disk-based DVRs

1999: In April, Steve Perlman deployed the world's first Digital Video Recorder (DVR), the Dishplayer satellite receiver on Dish Network. Within a year, over 200,000 units were sold[citation needed].


The two early consumer DVRs, ReplayTV and TiVo, were launched at the 1999 Consumer Electronics Show in Las Vegas. Although ReplayTV won the "Best of Show" award in the video category, it was TiVo that went on to much greater commercial success. The devices have steadily developed complementary abilities, such as recording onto DVDs, commercial skip, sharing of recordings over the Internet, and programming and remote control facilities using PDAs, networked PCs, or Web browsers. ReplayTV is a brand of digital video recorder (DVR), a term synonymous with personal video recorder (PVR). ... TiVo (pronounced tee-voh, IPA: ) is a popular brand of digital video recorder (DVR) in the United States. ... The International Consumer Electronics Show (CES) is a trade show held each January in Las Vegas, Nevada, and is sponsored by the Consumer Electronics Association. ... For further information, see Las Vegas metropolitan area and Las Vegas Strip. ... DVD (Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ...


This makes the "time shifting" feature (traditionally done by a VCR) much more convenient, and also allows for "trick modes" such as pausing live TV, instant replay of interesting scenes, chasing playback where a recording can be viewed before it has been completed and skipping advertising. Most DVRs use the MPEG format for encoding analog video signals. Time shifting is the recording of television shows to some storage medium to be viewed at a time convenient to the consumer. ... The video cassette recorder (or VCR, less popularly video tape recorder) is a type of video tape recorder that uses removable cassettes containing magnetic tape to record audio and video from a television broadcast so it can be played back later. ... Chase Play is a timeshifting facility of DVD-RAM DVD recorders and many Personal video recorders. ... Commercialism redirects here. ... The Moving Picture Experts Group or MPEG is a working group of ISO/IEC charged with the development of video and audio encoding standards. ... Analog video is a term that can refer to any of three analog television (picture only) transmissions signals. ...


The two consumer DVR brands in the United States are the TiVo and DNNA's ReplayTV. In the UK TiVo has a small presence; Thomson, Topfield, Fusion, Pace and Humax also supply digital terrestrial,(DTT) DVRs,In the uk DVRs are often refered to as plus boxes (such as BSKYB`s sky + and Virgin Medias V+ which integrates an HD Capability). BSkyB markets a popular combined EPG and DVR as Sky+. South African based Africa Satellite TV beamer Multichoice recently launched their PVR which is available on their Dstv platform. Established in Korea in 1998, TOPFIELD Co. ... Pace Micro Technology is a British manufacture of set top boxes for digital and analogue satellite television, founded in 1982. ... DTT is an LGV training company incoporating training schools across the UK. It is the largest national LGV training school and has recently floated on the stock exchange. ... This article or section does not cite any references or sources. ... The Sky Digital EPG in the United Kingdom and Republic of Ireland. ... This article needs additional references or sources to facilitate its verification. ...


Many satellite and cable companies are incorporating DVR functions into their set-top box, such as with DirecTiVo, DishPlayer/DishDVR, Scientific Atlanta Explorer 8xxx from Time Warner, Motorola 6xxx from Comcast, Moxi Media Center by Digeo (available through Charter, Adelphia, Sunflower, Bend Broadband, and soon Comcast and other cable companies), or Sky+. Also LG Group offers a television with DVR functions built in. The term set-top box (STB) describes a device that connects to a television and some external source of signal, and turns the signal into content then displayed on the screen. ... DirecTiVo is an informal term for the implemented combination of DIRECTV satellite television programming service and the TiVo digital video recorder service. ... The Explorer 8300 is a digital video recorder (DVR) that is manufactured by Scientific-Atlanta. ... The Motorola 6000 series of HDTV cable boxes includes several models: Motorola 6200: HDTV Cable Box with no recording capabilities Motorola 6208: Single tuner box with 80 GB hard drive Motorola 6412: Dual tuner box with 120 GB hard drive ... The Moxi media center utilizes a special user interface with a two-tuner HDTV DVR unit. ... Adelphia Communications Corporation, named after the Greek word brothers, was the fifth largest cable company in the United States before filing for bankruptcy in 2002 due to internal corruption. ... GoldStar logo, prominently used before the introduction of the LG logo LG Group is a large South Korean chaebol (conglomerate), which produces electronics (including domotics), mobile phones, and petrochemical products and operates subsidiaries like LG Electronics. ...


In the case of digital television there is no encoding necessary in the DVR, as the signal is already a digitally encoded MPEG stream. The DVR simply stores the digital stream directly to disk. Having the broadcaster involved with (subsidizing) the design of the DVR—and directly recording encrypted digital streams—can lead to features such as the ability to use interactive TV on recorded shows, pre-loading of programs. It can, however, also force the manufacturer to implement non-skippable advertisements and automatically-expiring recordings.


In the United States, the FCC has ruled that starting on July 1, 2007, consumers will be able to purchase a set-top box from a third-party company, rather than being forced to purchase or rent the set-top box from their cable company. [2] [3]


Introduction of dual-tuners

In 2003 many Satellite and Cable providers introduced dual-tuner DVRs. These machines have two tuners within the same receiver to operate independently of one another. The main use for this feature is the capability to record a live program while watching another live program simultaneously or to record two programs at the same time while watching a previously recorded one. Some dual-tuner DVRs also have the ability to operate two separate television sets at the same time. The PVR manufactured by UEC (Durban, South Africa) and used by Multichoice has the ability to view two programs while recording a third using a triple tuner. With some machines, such as the Scientific Atlanta 8300DVB PVR, it is possible to view one program whilst recording two other programs according to the users preference. Year 2003 (MMIII) was a common year starting on Wednesday (link displays 2003 calendar) of the Gregorian calendar. ... Durban (Zulu: eThekwini (IPA: ) is the second most populous city in South Africa, forming part of the eThekwini metropolitan municipality. ... M-Net (originally an abbreviation for Electronic Media Network) is a subscription-funded television channel in South Africa, established in 1986 by a consortium of newspaper companies. ... Scientific Atlanta is a large manufacturer of cable television, telecommunications, and broadband equipment. ...


PCs

Software and hardware is available which can turn personal computers running Microsoft Windows, Linux, and Macintosh into PVRs, and is a popular option for home-theater PC (HTPC) enthusiasts. To meet Wikipedias quality standards, the lead section of this article may need to be expanded. ... Linux (IPA pronunciation: ) is a Unix-like computer operating system. ... This article or section does not adequately cite its references or sources. ... A Home Theater PC (or HTPC) is a computer that is used to replace components in a home theater system. ...


Linux

There are many free DVR applications available for Linux, each released as open source and GPL-licensed : Linux (IPA pronunciation: ) is a Unix-like computer operating system. ... Open source refers to projects that are open to the public and which draw on other projects that are freely available to the general public. ... The GNU logo The GNU General Public License (GNU GPL or simply GPL) is a widely-used free software license, originally written by Richard Stallman for the GNU project. ...

A commercial product called SageTV for most popular Linux distributions. MythTV is a Linux application that turns a computer with the necessary hardware into a digital video recorder, a digital multimedia home entertainment system, or Home Theater Personal Computer. ... Freevo is a GPL open source application for Linux and BSD designed to run a homemade personal video recorder. ... SageTV Media Center is a popular digital video recording software package for Windows and Linux. ...


Macintosh

Elgato makes a series of DVR devices called EyeTV (610, 250, DTT, Hybrid, Diversity, and so forth). The software supplied with each device (but also available separately) is also called EyeTV. As of 2006, Elgato have released version 2.3 of their EyeTV software. Miglia used to make DVR hardware that ran the EyeTV software, but their contract with EyeTV has not been renewed and future hardware will utilise other DVR software. Elgato Systems is a hardware and software manufacturer that makes television viewing and recording products specifically for the Apple Macintosh family of personal computers, including internationally acclaimed EyeTV software. ... The subject of this article may not satisfy the notability guideline or one of the following guidelines for inclusion on Wikipedia: Biographies, Books, Companies, Fiction, Music, Neologisms, Numbers, Web content, or several proposals for new guidelines. ... 2006 is a common year starting on Sunday of the Gregorian calendar. ...


Other DVR products include myTV.PVR from EskapeLabs and ConvertX PVR from Plextor. MythTV (see above) also runs under Mac OS X, but most recording devices are currently only supported under Linux. Precompiled binaries are available for the MythTV front-end, allowing a Mac to watch video from (and control) a MythTV server running under Linux. MythTV is a Linux application that turns a computer with the necessary hardware into a digital video recorder, a digital multimedia home entertainment system, or Home Theater Personal Computer. ... Mac OS X (official IPA pronunciation: ) is a line of proprietary, graphical operating systems developed, marketed, and sold by Apple Inc. ...


Apple provides applications in the FireWire software developer kit which allow any Macintosh with a FireWire port to record the MPEG2 transport stream from a FireWire equipped cable box (for example: Motorola 62xx, including HD streams). Applications can also change channels on the cable box via the firewire interface. Only broadcast channels can be recorded as the rest of the channels are encrypted. iRecord is a free scheduled-recording program derived from this SDK.


Windows

Microsoft Windows has several free DVR applications including GB-PVR, Got All Media[4], MediaPortal, and Orb (web-based remote interface). DScaler also has DVR support in the works. Microsoft Corporation, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual revenue of US$44. ... To meet Wikipedias quality standards, the lead section of this article may need to be expanded. ... GB-PVR is a free Personal Video Recorder (PVR) software program for Microsoft Windows that allows a computers TV tuner card to be used to record and pause live TV, much like a PVR box such as TiVo. ... MediaPortal is an open source media center software that acts as front-end for Personal Video Recorder (PVR), video, pictures, music and many more functionalities. ... This article or section is not written in the formal tone expected of an encyclopedia article. ... DScaler is an open-source video deinterlacer and scaling program. ...


There also are several proprietary applications including AVS TV Box[5], CyberLink PowerCinema, SageTV, SnapStream Beyond TV, ChrisTV[6], Showshifter, Meedio (now a dead product - Yahoo! bought most of the company's technology and discontinued the Meedio line, and rebranded the software Yahoo! Go - TV, which is now a free product but only works in the U.S. and Canada), InterVideo WinDVR, Recordit Plus and the R5000-HD. It has been suggested that closed source be merged into this article or section. ... Founded in 1995, CyberLink Corp is a world leader and pioneer in bringing advanced digital video and audio software to the market. ... SageTV Media Center is a popular digital video recording software package for Windows and Linux. ... BeyondTV is PVR/media center software for Microsoft Windows produced by the american company SnapStream. ... Interface from ShowShifter DVB 3. ... InterVideo WinDVR is a commercial digital video recorder (DVR) software package for Windows operating systems. ... The R5000-HD is a popular Windows-based system for digitally capturing HD (High-Definition) and SD (Standard Definition) TV content from satellite and cable sources. ...


Windows Media Center is a DVR software by Microsoft bundled with the Media Center edition of Windows XP and Home Premium and Ultimate editions of Windows Vista. Windows Media Center on Windows Vista build 5536 Windows Media Center is an application designed to serve as a home-entertainment hub. ... A typical Windows XP MCE 2005 Menu Windows XP Media Center Edition (MCE) was a version of Windows XP designed to serve as a home-entertainment hub. ... Windows Vista is a line of graphical operating systems used on personal computers, including home and business desktops, notebook computers, Tablet PCs, and media centers. ...


Source video

Television and video are terms that are sometimes used interchangeably, but differ in their technical meaning. Video is the visual portion of television, whereas television is the combination of video and audio modulated onto a carrier frequency (i.e., a television channel), so that the signal can be delivered to the receiver (TV or computer/PVR with a TV tuner). This article does not cite any references or sources. ... In telecommunications, modulation is the process of varying a periodic waveform, i. ... Carrier frequency is the fundamental frequency used in both amplitude modulation and frequency modulation i. ...


Analog television

Analog television in NTSC, PAL or SECAM formats, analog cable, or regular VHS tapes use a signal that is fed directly to the electron beam within the television set. There are a number of details on how this is done, but in essence each line in each frame corresponds to a specific fraction of time within the signal. Analog television (or analogue television) encodes television and transports the picture and sound information as an analog signal, that is, by varying the amplitude and/or frequencies of the broadcast signal. ... The references in this article would be clearer with a different and/or consistent style of citation, footnoting or external linking. ... Television encoding systems by nation. ... SECAM, also written SÉCAM (Séquentiel couleur à mémoire, French for Sequential Color with Memory), is an analog color television system first used in France. ... Bottom view of VHS cassette with magnetic tape exposed Top view of VHS cassette with front casing removed The Video Home System, better known by its abbreviation VHS is a recording and playing standard for analog video cassette recorders (VCRs), developed by Victor Company of Japan, Limited (JVC) and launched... A charged particle beam is a group of electrically charged particles that have approximately the same kinetic energy and move in approximately the same direction. ...


To record an analog signal a few steps are required. A TV tuner card tunes into a particular frequency and then functions as a frame grabber, breaking the lines into individual pixels and quantizing them into a format that a computer can comprehend. Then the series of frames along with the audio (also sampled and quantized) are compressed into a manageable format, like MPEG-2, or WMF, usually in software. Some TV tuner cards like the DVR-250/350 or the TiVo chip deliver an MPEG-2 or other compressed stream directly to the computer, performing both the frame grabbing and compression in hardware. This greatly reduces the load on the CPU allowing an overall cheaper implementation. Hauppauge WinTV TV tuner card One of the first DVB-S2 tuner cards. ... A Sansui TU-X1 stereo FM tuner. ... A frame grabber is a component of a computer system designed for digitizing analog video signals. ... Quantized signal Digital signal In digital signal processing, quantization is the process of approximating a continuous range of values (or a very large set of possible discrete values) by a relatively-small set of discrete symbols or integer values. ... A sample refers to a value or set of values at a point in time and/or space. ... MPEG-2 is a standard for the generic coding of moving pictures and associated audio information [1]. It is widely used around the world to specify the format of the digital television signals that are broadcast by terrestrial (over-the-air), cable, and direct broadcast satellite TV systems. ... —ÆŒø… Ž šâÒÚà ... What is IVTV ? The primary goal of the IVTV project is to provide a clean room Linux Open Source driver implementation for video capture cards based on the iCompression iTVC15 or Conexant CX23415/CX23416 MPEG codec. ... The system load is a UNIX computing term that describes the amount of work that a computer system is doing. ...


Analog broadcast copy protection

Many mass-produced consumer DVRs implement a copy-protection system called CGMS-A (Copy Generation Management System--Analog). This encodes a pair of bits in the VBI of the analog video signal that specify one of the following settings: The vertical blanking interval (VBI) is an interval in a television or VDU signal that temporarily suspends transmission of the signal for the electron gun to move back up to the first line of the television screen to trace the next screen field. ...

  • Copying is freely allowed
  • Copying is prohibited
  • Only one copy of this material may be made
  • This is a copy of material for which only one copy was allowed to be made, so no further copies are allowed.

CGMS-A information may be present in analog broadcast TV signals, and is preserved when the signal is recorded and played back by analog VCRs, which of course don't understand the meanings of the bits. But the restrictions still come into effect when you try to copy the tape onto a PVR. The video cassette recorder (or VCR, less popularly video tape recorder) is a type of video tape recorder that uses removable cassettes containing magnetic tape to record audio and video from a television broadcast so it can be played back later. ...


Digital television

Digital television contains audio/visual signals that are broadcast over the air in a digital rather than analog format. Recording digital TV is generally a straightforward capture of the binary MPEG-2 data being received. No expensive hardware is required to quantize and compress the signal (as the television broadcaster has already done this in the studio). The MythTV DVR supports both international DVB signals and American ATSC signals while the TiVo Series 3 supports only the ATSC signals. In the U.S., the FCC attempted to place a road-block before digital DVRs with its "Broadcast flag" regulation. Digital video recorders which had not won prior approval from the FCC for implementing "effective" digital rights management would have been banned from interstate commerce as of July 2005. The regulation was struck down on May 6, 2005. Digital television (DTV) is a telecommunication system for broadcasting and receiving moving pictures and sound by means of digital signals, in contrast to analog signals used by analog (traditional) TV. DTV uses digital modulation data, which is digitally compressed and requires decoding by a specially designed television set, or a... A digital system is one that uses discrete values (often electrical voltages), especially those representable as binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (ie, as in an analog system). ... An analog or analogue signal is any continuously variable signal. ... MPEG-2 is a standard for the generic coding of moving pictures and associated audio information [1]. It is widely used around the world to specify the format of the digital television signals that are broadcast by terrestrial (over-the-air), cable, and direct broadcast satellite TV systems. ... Generally, quantization is the state of being constrained to a set of discrete values, rather than varying continuously. ... Categories: Disambiguation | Software stubs | Data compression software ... Broadcasting is the distribution of audio and/or video signals which transmit programs to an audience. ... MythTV is a Linux application that turns a computer with the necessary hardware into a digital video recorder, a digital multimedia home entertainment system, or Home Theater Personal Computer. ... Official DVB logo, found on compliant devices DVB, short for Digital Video Broadcasting, is a suite of internationally accepted open standards for digital television. ... ATSC Standards document a digital television format intend to replace (in the United States) the analog NTSC television system (NTSC is used mostly in North America and Japan). ... Motto: (Out Of Many, One) (traditional) In God We Trust (1956 to date) Anthem: The Star-Spangled Banner Capital Washington D.C. Largest city New York City None at federal level (English de facto) Government Federal constitutional republic  - President George Walker Bush (R)  - Vice President Dick Cheney (R) Independence from... The FCCs official seal. ... A broadcast flag is a set of status bits (or flags) sent in the data stream of a digital television program that indicates whether or not it can be recorded, or if there are any restrictions on recorded content. ... Digital rights management (DRM) is an umbrella term that refers to access control technologies used by publishers and other copyright holders to limit usage of digital media or devices. ... Article I, Section 8, Clause 3 of the United States Constitution empowers the United States Congress To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes. The Commerce Clause has been the subject of intense constitutional and political disagreement centering on the extent to...


DVD-based PVRs available on the market as of 2006 are not capable of capturing the full range of the visual signal available with high definition television (HDTV). This is largely because HDTV standards were finalized at a later time than the standards for DVDs. However, DVD-based PVRs can still be used (albeit at reduced visual quality) with HDTV since currently available HDTV sets also have standard A/V connections. High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. ...


Satellite or digital cable

Recording satellite or digital cable signals on a digital video recorder is more complex than recording analog signals or broadcast digital signals. This is so because the MPEG-2 or MPEG-4 stream is usually encrypted to prevent people from viewing the content without paying for it (usually via subscription). An Earth observation satellite, ERS 2 For other uses, see Satellite (disambiguation). ... Digital cable is a term for a type of cable digital television that delivers more channels than possible with analog cable by using digital video compression. ... MPEG-2 is a standard for the generic coding of moving pictures and associated audio information [1]. It is widely used around the world to specify the format of the digital television signals that are broadcast by terrestrial (over-the-air), cable, and direct broadcast satellite TV systems. ... MPEG-4 is a standard used primarily to compress audio and visual (AV) digital data. ...


The satellite or cable set-top box does two things. First, it decrypts the signal. Second, it decodes the MPEG stream into an analog, DVI, or HDMI signal for viewing on the television. In order to record cable/satellite digital signals you must get the signal after it is decrypted, but before it is decoded (between steps one and two); this is how DVRs built into set-top boxes work. The term set-top box (STB) describes a device that connects to a television and some external source of signal, and turns the signal into content then displayed on the screen. ... For other meanings of DVI, please see DVI (disambiguation). ... The High-Definition Multi-media Interface (HDMI) is an industry-supported, uncompressed, all-digital audio/video interface. ...


An alternative is that some satellite or (more commonly) cable set-top boxes have a FireWire port that can be connected to a computer. The recorded MPEG stream can be relayed to the computer via this FireWire port; though it can be done live, this is more commonly used for transferring shows from a set-top box with built-in DVR. (For instructions on doing this on a popular set-top box with DVR, please see the Wikibook entry How to use a Motorola DVR; some of the ideas there may apply to other set-top boxes as well.) The 6-pin and 4-pin FireWire Connectors FireWire is Apple Inc. ...


DVD

Many DVD-based DVRs are equipped with two DVD drives or an additional internal hard drive. This arrangement can be used to copy content from a source DVD, which is disallowed in the U.S. under the Digital Millennium Copyright Act if the disc is encrypted. Most such DVRs will hence not allow recording of video streams from encrypted movie discs. The Digital Millennium Copyright Act (DMCA) is a United States copyright law which implements two 1996 WIPO treaties. ...


Digital camcorders

Some DVD-based DVRs incorporate a Firewire connector which can be used to capture digital video from a MiniDV or Digital 8 camcorder, possibly recording a simple DVD as the camcorder is played back. Some editing of the resulting DVD is usually possible, such as adding chapter points. The 6-pin and 4-pin FireWire Connectors FireWire is Apple Inc. ... A MiniDV tape Digital Video (DV) is a video format launched in 1996, and, in its smaller tape form factor MiniDV, has since become one of the standards for consumer and semiprofessional video production. ...


Security applications

Digital video recorders configured for physical security applications record video signals from closed circuit television cameras for detection and documentation purposes. Many are designed to record audio as well. DVRs have evolved into devices that are feature rich and provide services that exceed the simple recording of video images that was previously done through VCRs. A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera. There is also much more control over quality and frame rate allowing disk space usage to be optimized and the DVR can also be set to overwrite the oldest security footage should the disk become full. In some DVR security systems remote access to security footage using a PC can also be achieved by connecting the DVR to a LAN network or the internet. Physical security describes measures that prevent or deter attackers from accessing a facility, resource, or information stored on physical media. ... Surveillance cameras. ...


Security DVRs may be categorized as being either PC based or embedded. A PC based DVR’s architecture is a classical personal computer with video capture cards designed to capture video images. An embedded type DVR is specifically designed as a digital video recorder with its operating system and application software contained in firmware or read only memory. It has been suggested that Embedded System Design in an FPGA be merged into this article or section. ... It has been suggested that this article or section be merged with Video editing card. ... It has been suggested that Maintenance OS be merged into this article or section. ... This article does not cite any references or sources. ... In computing, firmware is software that is embedded in a hardware device. ... Rom is also the name of a toy and comic book character Rom (Spaceknight). ...


Hardware features

Hardware features of security DVRs vary between manufacturers and may include but are not necessarily limited to Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. ...

  • Designed for rack mounting or desktop configurations.
  • Single or multiple video inputs with connector types consistent with the analogue or digital video provided such as coaxial cable, twisted pair or optical fiber cable. The most common number of inputs are 1, 2, 4, 8, 16 and 32. Systems may be configured with a very large number of inputs by networking or bussing individual DVRs together.
  • Looping video outputs for each input which duplicates the corresponding input video signal and connector type. These output signals are used by other video equipment such as matrix switchers, multiplexers, and video monitors.
  • Controlled outputs to external video display monitors.
  • Front panel switches and indicators that allow the various features of the machine to be controlled.
  • Network connections consistent with the network type and utilized to control features of the recorder and to send and/or receive video signals.
  • Connections to external control devices such as keyboards.
  • A connection to external pan-tilt-zoom drives that position cameras.
  • Internal CD, DVD, VCR devices typically for archiving video.
  • Connections to external storage media.
  • Alarm event inputs from external security detection devices, usually one per video input.
  • Alarm event outputs from internal detection features such as motion detection or loss of video.

Equipment mounted in several 19-inch racks. ... Coaxial Cable For the weapon, see coaxial weapon. ... 25 Pair Color Code Chart 10BASE-T UTP Cable Twisted pair cabling is a common form of wiring in which two conductors are wound around each other for the purposes of cancelling out electromagnetic interference known as crosstalk. ... Optical fibers An optical fiber (or fibre) is a glass or plastic fiber designed to guide light along its length by confining as much light as possible in a propagating form. ... An electrical bus (sometimes spelled buss) is a physical electrical interface where many devices share the same electric connection. ... Schematic of a 2-to-1 Multiplexer. ... A video monitor is similar to a television. ... It has been suggested that Keystroke be merged into this article or section. ... The terms storage (U.K.) or memory (U.S.) refer to the parts of a digital computer that retain physical state (data) for some interval of time, possibly even after electrical power to the computer is turned off. ...

Software features

Software features vary between manufacturers and may include but are not necessarily limited to

  • User selectable image capture rates either on an all input basis or input by input basis. The capture rate feature may be programmed to automatically adjust the capture rate on the occurrence of an external alarm or an internal event
  • Selectable image resolution either on an all input basis or input by input basis. The image resolution feature may be programmed to automatically adjust the image resolution on the occurrence of an external alarm or an internal event.
  • Motion detection: Provided on an input by input basis, this feature detects motion detection in the total image or a user definable portion of the image and usually provides sensitivity settings. Detection causes an internal event that may be output to external equipment and/or be used to trigger changes in other internal features.
  • Lack of motion detection. Provided on an input by input basis, this feature detects the movement of an object into the field of view and remaining still for a user definable time. Detection causes an internal event that may be output to external equipment and/or used to trigger changes in other internal features.
  • Direction of motion detection. Provided on an input by input basis, this feature detects the direction of motion in the image that has been determined by the user as an unacceptable occurrence. Detection causes an internal event that may be output to external equipment and/or be used to trigger changes in other internal features.
  • Routing of input video to video monitors based on user inputs or automatically on alarms or events.
  • Input, time and date stamping.
  • Alarm and event logging on appropriate video inputs.
  • Alarm and event search.
  • One or more sound recording channels.
  • Archival.

Capture can refer to a number of things aside from its usual dictionary definitions: Radio FM capture is also a phenomenon of frequency modulation. ... Image resolution describes the detail an image holds. ... It has been suggested that Motion detector be merged into this article or section. ... Event-driven programming is a computer programming paradigm. ... Stamping may refer to more than one thing: The craft of applying ink or dyes to a product with a Rubber stamp. ... For other uses, see Alarm (disambiguation). ... For alternate uses see: Archive (disambiguation). ...

Privacy concerns

It is possible when providing DVR service to gather real time data on user's viewing habits.[citation needed]


Patent litigation

On July 14, 2005, Forgent Networks filed suit[7] against various companies alleging infringement on U.S. Patent 6,285,746 , entitled "Computer controlled video system allowing playback during recording". The listed companies include EchoStar, Directv, Charter Communications, Cox Communications, Comcast, Time Warner, and Cable One. is the 195th day of the year (196th in leap years) in the Gregorian calendar. ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... Forgent Networks is a software company that specializes in meeting and scheduling programs. ...


Scientific-Atlanta and Motorola, the manufacturers of the equipment sold by the above mentioned companies, have filed a counter-suit against Forgent Networks claiming that their products do not violate the patent, and that the patent is invalid. The two cases have been combined into case 6:06-cv-208, filed in the United States District Court for the Eastern District of Texas, Tyler Division. Scientific Atlanta is a large manufacturer of cable television, telecommunications, and broadband equipment. ... Motorola Inc. ...


According to court documents, on June 20, 2006, Motorola requested that the United States Patent and Trademarks Office reexamine the patent, which was first filed in 1991, but has been amended several times.[8] is the 171st day of the year (172nd in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ...


On March 23, 2007 Cablevision Systems Corp lost a legal battle against several Hollywood studios and television networks to introduce a network-based digital video recorder service to its subscribers.


The saga continues: http://www.pvrwire.com/2006/04/06/tivo-vs-echostar-lawsuit-update/


See also

Some modern video cameras allow the user to record direct to a hard disk instead of to a tape. ... The following is a comparison guide for popular DVR (PVR) software packages. ... D-VHS logo “DVHS” redirects here. ... DVR with built-in DVD recorder. ... Freeview Playback is a consumer brand created in the UK by the DTG Group to raise consumer awareness and promote sales of Freeview capable PVRs. ... A hard disk recorder is a type of recording system that utilizes a high-capacity hard disk to record digital audio or digital video. ... It has been suggested that this article or section be merged with HTPC (Home Theater PC). ... NDS Group plc is a DRM and conditional access firm. ... The PACE Twin PVR (Personal Video Recorder) was launched in the UK in March 2003 and was the first to offer hard disk recording of Digital Terrestrial Television (DTT or DVB-T) with no subscription. ... ReplayTV is a brand of digital video recorder (DVR), a term synonymous with personal video recorder (PVR). ... This article needs additional references or sources to facilitate its verification. ... TiVo (pronounced tee-voh, IPA: ) is a popular brand of digital video recorder (DVR) in the United States. ... The Moxi media center utilizes a special user interface with a two-tuner HDTV DVR unit. ...

References

The European Broadcasting Union (EBU; French: , and unrelated to the European Union) was formed on 12 February 1950 by 23 broadcasting organisations from Europe and the Mediterranean at a conference in the coastal resort of Torquay in Devon, England. ...

External links

  • How DVR works.
  • The DV Show - Podcasting the Ins and Outs of Digital Video
  • DVRplayground - Online community devoted to discussing DVR trends and technology

  Results from FactBites:
 
Digital video recorder - Wikipedia, the free encyclopedia (2635 words)
Video is the visual portion of television, whereas television is the combination of video and audio modulated onto a carrier frequency (i.e., a television channel), so that the signal can be delivered to the receiver (TV or computer/PVR with a TV tuner).
Recording digital TV is generally a straightforward capture of the binary MPEG-2 data being received.
Digital video recorders which had not won prior approval from the FCC for implementing "effective" digital rights management would have been banned from interstate commerce as of July 2005.
Sting - Digital Video Recorder - Video glasses - Video Pen - Button Camera - Time date stamp (622 words)
Video glasses are the latest in covert video available from ESP. Using an ergonomically design fit, and mounted in a super thin wire frame,they are lighter, more conformable and give a natural look to the wearer.
Video Pen In sensitive indoors situations where the person conducting the surveillance is known not to wear glasses, we recommend our Video pen camera.
Worn innocently in a shirt pocket, this self-contained video outfit is capable of recording undetected all the events that occur around the wearer.
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