Sony's HD DVRs

ony makes two HD DVR models, the DHG-HDD500 and the DHG-HDD250. Both of these DVRs work with existing analog cable systems, and include a free Electronic Programming Guide (EPG). They also include antenna for recording free over-the-air HDTV. The DHG-HDD500 can record and store at least 60 hours of high-definition video and up to 400 hours of standard-definition video, while the HDD250 can record at least 30 hours of high definition and up to 200 hours of standard definition video. Both include multiple analog inputs and outputs as well as Component, HDMI and digital audio outputs. These are expensive and high-end DVRs that are ideal for analog cable subscribers who want the ability to record HD signals free over-the-air.

High Definition (HD) Options for Digital Video Recording (DVR)

High Definition (HD) Digital Video Recording devices are starting to become more readily available, and affordable, for consumers. The DVRs offer all the functionality of a standard DVR (like TiVo) but also allow for viewing and recording of HD broadcasts. If you are a Cable subscriber, there are HD DVRs available to lease from the providers for a monthly fee. Satellite providers have HD DVRs available to purchase. There are also Media Center PCs and TV Capture Cards with HD compatabilty. This article will focus on all the different options available for HD Recording, and which methods are right for you.

TiVo

TiVo (pronounced /ˈtiːvoʊ/) is a pioneer of the digital video recorder (DVR). TiVo was introduced in the United States, and is now available in New Zealand, Canada, Mexico, Australia, Taiwan, and the UK. TiVo DVRs provide an electronic television programming schedule, and provide features such as Season Pass recordings (which ensure subscribers never miss an episode of their favorite shows) and WishList searches (which allow the user to find and record shows that match their interests by title, actor, director, category or keyword). TiVo also provides a range of features when the TiVo DVR is connected to a home network, including film and TV show downloads, advanced search, personal photo viewing, music

TiVo Digital Video Recorder:A TiVo DVR serves a function similar to a videocassette recorder, in that both allow a television viewer to record programming for viewing at a later time. Unlike a VCR, which uses removable magnetic tape cartridges, a TiVo DVR stores television programs onto non-removable hard disk storage. Also, the TiVo device does not have any buttons on the front panel; its functions are solely manipulated by remote control.

What distinguishes TiVo from other DVRs is the sophisticated software written by TiVo Inc. that automatically records programs—not only those the user specifically requests, but also other material the user is likely to be interested in. TiVo DVRs also implement a patented feature TiVo calls "trick play," which allows the viewer to pause live television, and rewind and replay up to a half hour of recently viewed television. More recent TiVo DVRs can be connected to a computer local area network, which allows the TiVo device to download information and even video programs, music and movies from the Internet

Market share:While its former main competitor in the US, ReplayTV, had adopted a commercial-skip feature, TiVo decided to avoid automatic implementation of that feature, fearing such a move might provoke backlash from the television industry. ReplayTV was sued over this feature,[9] as well as the ability to share shows over the Internet, and these lawsuits contributed to the bankruptcy of SONICblue,[10] their owner at the time. Their new owner, DNNA, dropped both features in the final ReplayTV model, the 5500. However, the automatic commercial-skip feature was simply replaced with Show|Nav, which requires only the push of the arrow buttons to jump between segments. ReplayTV now has a negligible market share, as they no longer manufacture DVR hardware.[citation needed]

Other distributors' competing DVR sets in the US include Comcast and Verizon, although both distribute third-party hardware with this functionality built-in. Verizon uses boxes fitted for FiOS, allowing high-speed internet access and other features.

As of October 2008, TiVo has 3.46 million subscribers in the US[11][12], down from a peak of 4.36 million in January 2006[12].

[edit] Controversies

More efficient TV viewing with PVR technology

A 31″ CRT TV can use over 200 watts of electricity, larger televisions use more energy. LCD and plasma televisions uses up to 2/3 less energy, but so far they are still several times more expensive than their similarly sized CRT counterparts. The most obvious way to reduce your energy consumption regarding the TV is to simply watch less. I don’t watch much TV anyways, however I made an upgrade to my home entertainment system last year that has reduced energy consumption, freed up more of my time, and even lets me see my favorite TV shows, whenever I want.
I have a Personal Video Recorder, or PVR, from my cable company. Probably the most well-known PVR system is the TiVo, but all PVRs offer the same benefits. The benefit that I’ve used to save energy and tme is the fast forwarding function. A 30 minute program is reduced to an average of 20-22 minutes by fast forwarding through commercials and credits, reducing the time the TV is on by around 30%. This frees up about 10 minutes for every 30 minutes I would have otherwise spent watching TV, which ends up being an additional 90 minutes per week.

A PVR is essentially a computer using specialized software and hardware, and like any other computer it goes into a low-power standby mode which further reduces energy consumption. Rather than waiting for a favorite show to start with the TV on, I just set the PVR to record it and then it will wake up and record the show by itself to be watched whenever it’s convenient.

One thing that many people don’t know, is that TVs and other electronic devices can draw power even when in “sleep” mode. Conventional TVs draw up to 12 watts while they’re switched off, EnergyStar TVs draw 3 watts or less. The only way to eliminate this phantom load is to plug the TV into a switched power bar, and flip the switch when the TV isn’t in use. Since cutting the power to the PVR would prevent it from switching itself on, the PVR should be on a separate power strip that is left on. A personal computer, which is what a PVR is, draws between 1-6 watts in standby mode. Combined with a power strip switch for the TV, this results in increased energy savings as well as retaining the increased functionality for your home entertainment

GB-PVR

GB-PVR is a PVR (personal video recorder) application, running on Microsoft Windows, whose main function is scheduling TV recordings and playing back live TV. This PVR also acts as a home media center with a digital video recorder, a radio station online tuner, a music and movie player, a library of images and other features.

Although GB-PVR supports open interfaces, the core engine code is closed. However developing personal plug-ins is an option to extend the application and these can be closed or open source, depending on the developer's interests. These plug-ins can be developed in C#, VB.NET or C++ and exist some examples available in the GB-PVR official Forums and the GB-PVR Documentation wiki websites. Moreover the software has been developed with an interface which allows to change the skin view or other graphic elements as the wallpaper.

GB-PVR is mostly an MPEG recording and playback system, but may also play other non-MPG content such as AVI (DivX/Xvid), WMV, and other formats that are supported by the codecs installed into a computer's.

It requires a supported TV tuner card, a VMR9 capable display adapter (video card), and a supported MPEG2 Decoder. Other requirements are listed on the GB-PVR web site.

The ultimate in HD TV?

Both projectors, however, feature extra image enhancement courtesy of integrated Pixelworks DNX 10-bit video processing technology.

The Pixelworks magic consists of a number of techniques - noise reduction, standard and high definition video format motion adaptive deinterlacing, 10-bit color processing, advanced scaling, dynamic edge enhancement, and low-angle line smoothing technology.

The IN82 and IN81 also boast two HDMI 1.3 inputs, and ship with a 2 metre HDMI cable and M1-to-HDMI adapter. An optional anamorphic lens attachment, says InFocus, allows 2.35:1 movies to be shown in full 1920 x 1080 resolution. Nice.

For more information about the InFocus Play Big line, point your browser towards

Freeview Playback vs Sky+

Freeview Playback brings standardised 'time shifting' to the digital terrestrial platform. Like Sky+ and TiVo before it, Freeview Playback technology relies on an integrated hard disk drive to constantly record the TV channel you're watching.


Thanks to this constant recording, Freeview Playback gives you the ability to pause live TV and rewind it.

The talents of Freeview Playback don't end there. Intelligent features supported under the Group 2 certification include 'schedule tracking' and 'auto-buffering'. These ensure that any changes in the TV schedule caused by breaking news or overrunning programmes do not cause recordings to be missed.

By the October launch, the Freeview Playback specification should also offer a comprehensive Series LInk or Season Pass option - this will enable you to auto-record every episode in a series. A TiVo-style programme recommendation feature is also promised.

New LG TVs first with Freeview Playback

Need a TV with a built-in PVR? Don't want to pay for a Sky+ box? LG announced today that it's adding Freeview Playback functionality to its upcoming Time Machine LCD and plasma TV ranges.

LG's HD-Ready LT75 LCD series (available with 32-, 37- and 42-inch screens) will feature the system in October. As will the company's new PT85 plasma models (available in 42- and 50-inch sizes).



LG's LT75 HD-ready TV hosts a 160GB hard disk drive and Freeview Playback PVR technology

What is a PVR?

PVR stands for "Personal Video Recorder", sometimes known as the DVR (Digital Video Recorder).

Rather than recording onto VHS video cassettes, a PVR records TV programmes onto a hard disk that's built into a set-top box.

There are several advantages to using a PVR to record your favourite TV shows: no tapes to rewind, the ability to pause live TV, integrated programme guides, and series recording, plus a lot more storage space than a standard VHS cassette. You can copy programmes down onto video tape or a DVD recorder for archiving, if you wish.

Digital Video Recorder Basics

In a nutshell, a DVR is a glorified hard drive inside a fancy box that looks nice in your entertainment center. The hard drive is connected to the outside world through a variety of jacks on the back of the box, usually the typical RCA connections that you would use to hook up, say, a cable box or a VCR.
back of a dvir­
Photo courtesy of Amazon.com
The back of the TiVo Series 2 80-hour DVR

­The television signal comes into the DVR's built-in tuner through antenna, cable or satellite. If the signal comes from antenna or cable, it goes into an MPEG-2 encoder, which converts the data from analog to digital (MPEG-2, by the way, is the compression standard used to fit information onto a DVD). From the encoder, the signal is shipped off to two different places: first, to the hard drive for storage, and second, to an MPEG-2 decoder, which converts the signal back to analog and sends it to the television for viewing.

Some systems use dual tuners, allowing users to record different programs on different channels at the same time. On a few systems, you can even record two programs while watching a third pre-recorded show.

The device is driven by a customized operating system -- for instance, in the case of TiVo, the machine runs on a highly modified Linux installation. The operating system resides on the hard disk, along with the recording space, a buffer for live broadcasts, and in some cases a space for future expansion.

While the system might seem pretty ho-hum on first analysis, the digital storage of television signals opens up a whole new world of possibilities when it comes to playback and viewing.
Satellite TV and Digital Cable
In the case of satellite TV systems or digital cable, no encoders are used within the box because the satellite or cable company has converted the signal to digital already. This results in higher picture quality than on analog cable or antenna systems.

­First, a DVR is tapeless. With a VCR, the device itself is merely a recording tool; the blank cassette is the media. In a DVR, the media and tool are one and the same. This is obviously a plus if you never seem to be able to find a blank tape when it's time to record something, but it can also be a drawback. Because the media is hard-wired into the machine, adding additional storage space is not possible. There are Web sites that offer instructions on how to open a DVR and add a new hard drive, but beware -- this will definitely void your warranty. Getting more recording time is easy with a VCR -- just buy another box of blank tapes. More recording time on a DVR involves buying a new unit.

You can incorporate some DVRs into your home network, which can allow you to access your system remotely. You could set your DVR to record a specific show from halfway across the world with just a few clicks of your mouse.

Perhaps the most important benefit of DVRs is the unprecedented control over playback. With a VCR, you have to wait for a program to finish recording before you can start watching it. Since there's no tape to rewind, digital recording doesn't have this limitation. A program that started recording 10 minutes ago can be viewed at any time, even while it's still recording.

The future of TV advertisements

Digital video recorders are also changing the way television programs advertise products. Watching pre-recorded programs allows users to fast-forward through commercials, and some technology allows users to remove commercials entirely. This feature has been controversial for the last decade, with major television networks and movie studios claiming it violates copyright and should be banned.

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.

The first DVR which had a built-in Commercial skipping feature was ReplayTV with its "4000 Series" and "5000 Series" units. In 2002 five owners of the ReplayTV DVR sued the main television networks and movie studios, asking the federal judge to uphold consumers' rights to record TV shows and skip commercials claiming that features like commercial skipping help parents protect their kids from excessive consumerism. ReplayTV ended up filing for bankruptcy in 2003 after fighting a copyright infringement suit over the ReplayTV's ability to skip commercials. Currently, Windows Media Center has the ability to skip commercials after installing a third-party add-on called "DVRMSToolbox" (which is not supported by Microsoft). There is a command-line program called Comskip that detects commercials in an MPEG-2 file and saves the positions of them to a text file. This file can then be fed to a program like MEncoder to actually remove the commercials.

Many speculate that television advertisements will be eliminated altogether, replaced by advertising in the TV shows themselves. For example, Extreme Makeover: Home Edition advertises Sears, Kenmore, Kohler, and Home Depot by specifically using products from these companies, and some sports events like the Sprint Cup of NASCAR are named after sponsors.

Another type of advertisement shown more and more, mostly for advertising TV shows on the same channel, is where the ad overlays the bottom of the TV screen, blocking out some of the picture. "Banners", or "Logo Bugs", as they are called, are referred to by media companies as Secondary Events (2E). This is done in much the same way as severe weather warnings are done. Sometimes these take up only 5-10% of the screen, but in the extreme, can take up as much as 25% of the viewing area. Some even make noise or move across the screen. One example of this is the 2E ads for Three Moons Over Milford in the months before its premiere. A video taking up approximately 25% of the bottom-left portion of the screen would show a comet impacting into the moon with an accompanying explosion, during another television program.

Due to this widely-used, groundbreaking technology, advertisers are now looking at a new way to market their products on television. An excerpt from the magazine, Advertising Age, reads: "As advertisers lose the ability to invade the home, and consumer's minds, they will be forced to wait for an invitation. This means that they have to learn what kinds of advertising content customers will actually be willing to seek out and receive."[14]

Due to ad skipping and the time-sensitive nature of certain ads, advertisers are wary of buying commercial time on shows that are heavily DVR'd.[15]. However, the DVR enables dynamic ad insertion. Advertisers could inject time relevant ads to recorded programs when the program is viewed. This way the ads could be not just time relevant but also personalized to viewers interests. It remains to be seen whether viewers want to receive such ads.

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.
* Compression methods determine quality of playback. H.264 hardware compression offers fast transfer rates over the internet with high quality video.
* Motion detection: Provided on an input by input basis, this feature detects motion 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.
* Commercial hopping. Rather than fast-forwarding through commercials, an undocumented feature of the TiVo box is that the user can reprogram the tab-to-end button by entering a sequence of buttons on the remote: SELECT-PLAY-SELECT-3-0-SELECT and listening for the confirming chimes that signal the feature has been activated (or deactivated). The tab-to-end button no longer jumps to the end of a recording when so activated: It skips 30 seconds, which is the length of U.S. commercials. In combination with the 8-second rewind button, most viewers can completely miss commercial breaks in programming.

Hardware features

Hardware features of security DVRs vary between manufacturers and may include but are not necessarily limited to

* 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.

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. videoNEXT also makes a NVR surveillance application for the Mac OS X. Some of the latest professional DVRs include video analytics firmware, to enable functionality such as 'virtual tripwire' or even the detection of abandoned objects on the scene.

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.

Digital camcorders

A digital camcorder combines a camera and a digital video recorder.

Some DVD-based DVRs incorporate connectors that can be used to capture digital video from a camcorder. Some editing of the resulting DVD is usually possible, such as adding chapter points.

Some digital video recorders can now record to solid state flash memory cards. There are some digital video recorders that combine video and graphics in real time to the flash card, such as the video logger from Racelogic [6] which takes multiple camera inputs and GPS generated graphics and merges them into one video.

DVD

Many DVD-based DVRs have the capability to copy content from a source DVD. In the U.S. this is disallowed 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.

Digital cable/satellite

Recording satellite or digital cable signals on a digital video recorder can be more complex than recording analog signals or broadcast digital signals. A number of different transmission schemes exist, and the video streams are usually encrypted to prevent people from viewing the content without paying subscription fees.

A satellite or cable set-top box does two things. First, it decrypts the signal. Second, it decodes the MPEG stream into an analog 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.

Cable and satellite providers often offer their own DVRs along with a service plan. These DVRs have access to the encrypted video stream, and will generally enforce the provider's restrictions on copying of material outside the confines of the box.

DVB

DVB Digital television contains audio/visual signals that are broadcast over the air in a digital rather than analog format. The DVB data stream can be directly recorded by the DVR.

Copy protection

The U.S. FCC attempted to limit the abilities of digital DVRs with its "broadcast flag" regulation. Digital video recorders that 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.

ATSC broadcast

ATSC television broadcasting is primarily used in North America. The ATSC data stream can be directly recorded by the DVR, though many DVRs record only a subset of this information (that can later be transferred to DVD. An ATSC DVR will also act as a Set-top box, allowing older televisions or monitors to receive digital television.

Digital sources overview

Recording digital signals is generally a straightforward capture of the binary MPEG 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).

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.

Analog broadcast copy protection

Many mass-produced consumer DVRs implement a copy-protection system called CGMS-A or 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:

* 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.

Analog sources overview

The first DVRs were designed to record Analog television in NTSC, PAL or SECAM formats.

To record an analog signal a few steps are required. 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, usually in software.

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) for delivery. Most DVRs can record both.

Windows

There are several free DVR applications available for Microsoft Windows including GB-PVR, MediaPortal, and Orb (web-based remote interface). DScaler also has DVR support in the works.

There are also several proprietary applications available including CyberLink, SageTV, Beyond TV, Showshifter, InterVideo WinDVR, the R5000-HD and 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.[12]).

Windows Media Center is a DVR software by Microsoft bundled with the Media Center edition of Windows XP Home Premium / Ultimate editions of Windows Vista as well as most editions of Windows 7.

Mac OS

Elgato makes a series of DVR devices called EyeTV. The software supplied with each device is also called EyeTV, and is available separately for use on compatible third-party tuners from manufacturers such as Pinnacle, TerraTec, and Hauppauge.

SageTV provides DVR software for the Mac with built in placeshifting for watching TV remotely and sells and supports the Hauppauge HVR-950, myTV.PVR and HDHomeRun hardware with its DVR software. SageTV software also includes the ability to watch YouTube and other online video with a remote control.

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.

Apple provides applications in the FireWire software developer kit which allow any Mac 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.

PC-based DVRs

Linux

There are many free DVR applications available for Linux, each released as free and open source software under the GNU General Public License:

* MythTV
* VDR
* LinuxMCE

A commercial and proprietary application called SageTV is available for most popular Linux distributions.

VESA Compatible DVRs

VESA compatible DVR are designed small and light enough to mount to the back of an LCD monitor that has clear access to VESA mounting holes (100x100mm). This allows users to use their own personal monitor to save on cost and space.

Integrated LCD DVR

DVRs integrated into LCD displays also exist. These systems let the user to simplify the wiring and installation, and they have to use only one device instead of two.

There are examples of security systems integrated into such DVRs, and thus they're capable of recording more input streams in parallel. Such devices can also be used as disguised observation systems, displaying pictures or videos as typical store display.

Introduction of dual tuners

In 2003 many Satellite and Cable providers introduced dual-tuner DVRs. In the UK, BSkyB introduced their first PVR Sky+ with dual tuner support in 2001. 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.

DVRs tied to a video service

At the 1999 CES, Dish Network demonstrated the hardware that would later have DVR capability with the assistance of Microsoft software [6]. Users would have to wait until June 1999 for simple time shifting capabilities in the 7100, rebranded as the DISHPlayer satellite receiver,[7] which also included WebTV Networks internet TV. [6] By the end of 1999 the Dishplayer had full DVR capabilities and within a year, over 200,000 units were sold.[8][9]

In the UK, DVRs are often referred to as "plus boxes" (such as BSKYB's Sky+ and Virgin Media's V+ which integrates an HD capability, and the subscription free Freesat+ and Freeview+). British Sky Broadcasting markets a popular combined EPG and DVR as Sky+. TiVo launched a UK model in 2000, and while no longer on sale, the subscription service is still maintained. South African based Africa Satellite TV beamer Multichoice recently launched their DVR which is available on their Dstv platform. In addition to ReplayTV and TiVo, there are a number of other suppliers of digital terrestrial (DTT) DVRs, including Thomson, Topfield, Fusion, Pace Micro Technology, Humax and AC Ryan Playon.

Many satellite, cable and IPTV companies are incorporating DVR functions into their set-top box, such as with DirecTiVo, DISHPlayer/DishDVR, Scientific Atlanta Explorer 8xxx from Time Warner, Total Home DVR from AT&T U-verse, 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+. Astro introduced their DVR system, called Astro MAX, which was the first PVR in Malaysia. Sadly, it was phased out two years after its introduction.

In the case of digital television, there is no encoding necessary in the DVR since the signal is already a digitally encoded MPEG stream. The DVR simply stores the digital stream directly to disk. Having the broadcaster involved with, and sometimes subsidizing, the design of the DVR can lead to features such as the ability to use interactive TV on recorded shows, pre-loading of programs, or directly recording encrypted digital streams. 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. [10] This ruling only applies to "navigation devices," otherwise known as a cable television set-top box, and not to the security functions that control the user’s access to the content of the cable operator. [11] The overall net effect on DVRs and related technology is unlikely to be substantial as standalone DVRs are currently readily available on the open market.

Hard-disk based DVRs

The two early consumer DVRs, ReplayTV and TiVo, were launched at the 1998 Consumer Electronics Show in Las Vegas. Microsoft also demonstrated a unit with DVR capability but commercial availability of this software would have to wait until the end of 1999 for full DVR features in Dish Network's DISHplayer receivers. TiVo shipped their first units on March 31, 1999, and to this day the last Friday in March is celebrated as a company holiday known as 'Blue Moon'.[2] Although ReplayTV won the "Best of Show" award in the video category[3] with Netscape co-founder Marc Andreessen as an early investor and board member[4], it was TiVo that went on to much greater commercial success. While early legal action by media companies forced ReplayTV to remove many features such as automatic commercial skip and the sharing of recordings over the Internet[5], newer devices have steadily regained these functions while adding complementary abilities, such as recording onto DVDs and programming and remote control facilities using PDAs, networked PCs, and Web browsers. The label PVR has almost fallen completely into disuse in the US trade news media (it is still use in the United Kingdom) in favor of the more popular DVR descriptor. The name PVR never really caught on, although its use has not entirely vanished. As of December 29, 2008, Armstrong Cable still uses PVR terminology.[citation needed]

Hard-disk based DVRs make the "time shifting" feature (traditionally done by a VCR) much more convenient, and also allow 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 of advertising. Most DVRs use the MPEG format for compressing the digitized video signals. When there is recorded time left to be played it is often referred to as "future credit" or "the power".[citation needed] Despite the yearnings of customers, one cannot purchase more "future credit" from a service provider.

Digital video recorder

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 memory medium within a device. The term includes stand-alone set-top boxes, portable media players (PMP) 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; LG was first to launch one in 2007.[1] A digital camcorder combines a camera and a digital video recorder. Also, mobile phones often have a camera as well as some digital video recording capability