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(1) (Digital Video Recorder) A device that records video from up to a dozen or more surveillance cameras onto a hard disk. The frame rate can be switched from real time to time lapse in order to save storage space. Digital recorders are more flexible than earlier analog VHS tape systems, and the video can be easily transmitted over a computer network. See CCTV.

(2) (Digital Video Recorder) Also known as a "personal video recorder" (PVR) or "hard disk recorder," a DVR is a consumer device that allows the viewer to pause and rewind any broadcast, cable or satellite TV program as well as record and play back selected programs (see live pause). An order of magnitude more flexible than earlier videocassette tape recorders (VCRs), an entire season of programs from one or more favorite series can be recorded.

DVRs may be built into the set-top box or replace the box using plug-in modules (see CableCARD). They store incoming digital TV signals on the hard disk as well as digitize analog TV into the MPEG-2 format. The video may be compressed to maximize storage space.

Part of the Service or Stand-Alone
The DVR periodically downloads channel program guide updates as well as software updates for the unit itself. When the DVR is integrated into the cable or satellite set-top box, the downloads ride the same medium as the TV service. When the DVR is stand-alone, the downloads come in via the home network.

Before the Turn of the Century
DVRs first came on the market in 1999 with products from ReplayTV and TiVo ( They quickly made the VCR obsolete for timeshifting TV programs, and Tivo became the DVR leader. ReplayTV was later acquired by SONICblue, D&M Holdings and eventually the DirecTV satellite TV service ( See cloud DVR, multi-room DVR sharing, live pause, DVD recorder and networked DVR. Contrast with NVR.

This earlier DVR from ReplayTV appears in front of the Find Shows screen, which enables a viewer to search for programming throughout the week by keyword. (Image courtesy of ReplayTV.)
References in periodicals archive ?
The ProStream(TM) 1000 with Mentor re-encoding technology -- which is ideal for video-on-demand (VOD), network personal video recorder (nPVR), switched digital broadcast and digital turnaround applications -- reduces capital and operating expenditures while providing outstanding picture quality.
Seagate's specialized CE hard drives and unique CE services provide storage for the new world of digital entertainment, enabling personal video recorders (PVR), video game consoles, audio jukeboxes, home media centers and networked entertainment systems.
The projected growth of recordable DVD is likely to come from three key areas: DVD-based personal video recorders, as a replacement for videotape in consumer and professional video production, and in computer data storage applications.
As a result, products such as media gateway set-top boxes can distribute broadcast-quality video to any networked display device in the home, such as HDTVs, plasma and LCD TV monitors, PDAs, web tablets, personal computers and personal video recorders (PVRs).
In doing so, the Equator BSP-15 chip becomes the first hardware platform to decode high-definition Windows Media Video 9 at 720p, which is two and a half times the resolution of a DVD, to the consumer electronics industry, offering manufacturers of DVD players, VOD systems, personal video recorders and other video-centric consumer electronic appliances unprecedented performance, product differentiation and time-to-market advantage.
SonataNet is based on Magnum's MS9400 line of advanced video processing chips for DVD and hard disk-based personal video recorders, A/V jukeboxes, portable video recorders and intelligent digital TVs.
The MS9330 integrates a single ATAPI memory controller, and is optimized for personal video recorders with a single DVD drive, hard disk, or flash memory.
Network attached storage (NAS) systems designed with our Indigita chips will play a key role in enabling HANA-compliant products such as HDTVs, next-generation HD-DVD players/recorders, personal video recorders (PVRs), digital set top cable boxes, network interface units (NIUs) and home theater systems.

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