DTV Booklet英文版.pdf
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1、 Federal Communications Commission Media Bureau and Consumer the units are typically quite heavy. Front Projectors - Projectors are TVs that create an image by projecting onto a wall or stand- alone screen (much like a movie theater). Projectors use the same digital projection technologies as rear p
2、rojection TVs but, because the screen is separate, the image can be the size of an entire wall. Projectors are not as bright and often require the room to be dark in order to clearly see the image. 8 DTV At A Glance www.dtv.gov www.dtv.gov www.dtv.gov www.dtv.gov 8 Digital TV Digital broadcasts are
3、available now in every market. After the digital transition is completed, over-the-air television will only be broadcast in digital format. With an integrated DTV set, only an antenna is needed to receive over-the-air DTV broadcast programming. For a monitor or analog TV, a DTV set-top box is requir
4、ed. Multicasting, electronic program guide, data streaming, and high definition available. Will work with cable, satellite, VCRs, DVD players, camcorders, video games, and other devices. Images will not be displayed in HDTV unless the equipment is made for it. HDTV High Definition DTV Provides best
5、available picture resolution, clarity, and color. Up to 1080 lines of resolution - most common formats are 720p (progressive) and1080i (interlaced). 4x3 or 16x9 aspect ratio. Multi-channel digital surround sound, including Dolby Digital 5.1. Can receive both digital and analog TV. No set-top box nee
6、ded if tuner built- in. SDTV Standard Definition DTV Provides good pictures without interference. 480 interlaced lines of resolution. 4x3 or 16x9 aspect ratio. Multi-channel digital surround sound, including Dolby Digital 5.1. Can receive both digital and analog TV. No set-top box needed if tuner bu
7、ilt- in. Analog TV Analog broadcasts may continue through February 17, 2009. Analog receivers currently built into virtually every TV. Single program stream, no advanced services. Will continue to work with cable, satellite, VCRs, DVD players, camcorders, video games, and other devices. Provides goo
8、d pictures but with interference and noise. Up to 480 interlaced lines of resolution. 4x3 aspect ratio. FM stereo sound. Can receive only analog TV. A set-top box is needed to receive DTV. EDTV Enhanced Definition DTV Provides better picture resolution, clarity, and color. At least 480 progressive l
9、ines of resolution. 4x3 or 16x9 aspect ratio. Multi-channel digital surround sound, including Dolby Digital 5.1. Can receive both digital and analog TV. No set-top box needed if tuner built- in. 9 DTV Definitions Analog TV: Todays TV system that uses radio frequency (RF) waves to transmit and displa
10、y pictures and sound. Aspect ratio: Screens width as compared to its height. For example, for 4x3, the traditional TV aspect ratio, a 32-inch TV would be 25 inches wide and 19 inches tall. A 16x9 widescreen 32-inch TV is closer to a movie screen than a traditional TV, and would be 28 inches wide and
11、 16 inches tall. Broadcast Digital-to-Analog Converter Box: A stand-alone device that receives and converts digital signals into a format for display on an analog television receiver. CableCARD: Security card that digital cable ready TV owners must obtain from their cable company in order to view sc
12、rambled programming such as premium services. Cathode Ray Tube (CRT) Screens: Traditional color television screens are available for both analog and digital TV. Their resolution and scanning vary from model to model. These screens have a very bright picture, but are limited in size and are quite hea
13、vy. Closed Captioning: Service that allows persons with hearing disabilities to read dialogue, or the audio portion of a video, film, or other presentation, on the TV screen. Coaxial: Coaxial inputs (sometimes just called “cable”) provide a simple and common way to transmit video. Now coaxial inputs
14、 are mostly used for connecting a TV set to an antenna or cable system. Component Video: Also known as “Y Pb Pr,” this connector splits the video signal into three parts. With two audio connections, this 5 wire solution is the most common way to connect EDTVs to DVD players and most HDTV monitors to
15、 their receivers or other set-top boxes. Composite Video: Also called “RCA” connectors, it is the most common way to connect peripherals and other components. It consists of one yellow connector for video and two audio connectors for “right” and “left”. Composite connectors cannot transmit high defi
16、nition pictures, so for HDTV, another connector option, such as HDMI or Component Video, must be used. Digital Broadcast Satellite (DBS): TV programming delivered via high-powered satellite. Signals are transmitted to a small dish (usually 18 - 24 inches across) mounted outside. Digital Cable Ready
17、TV (DCR): Also referred to as “plug-and-play,” this is a DTV or other device for digital cable customers that plugs directly into the cable jack, and does not require a separate set-top box to view analog and unscrambled digital cable. Used with a CableCARD, it can receive scrambled programming such
18、 as premium services. www.dtv.gov www.dtv.gov www.dtv.gov www.dtv.gov 9 10 Digital TV (DTV): Digital technology television that uses radio frequency (RF) to transmit computer code and display it as pictures and sound. Dolby Digital: Form of multi-channel digital sound, it provides efficient encoding
19、 and noise reduction for high quality surround sound. Downconvert: Process by which a high resolution signal is reduced to a lower resolution for display. Usually, extra lines are simply ignored when drawing the lower resolution image, but sometimes more sophisticated methods are used. DVI: Digital
20、Video Interface (DVI) is a high quality digital connector. Similar to HDMI (see definition) and sometimes with HDCP (see definition), DVI can digitally transmit uncompressed high definition video, preserving perfect picture quality. Unlike HDMI or Firewire (see definition), DVI requires a separate a
21、udio connection. Enhanced Definition TV (EDTV): Better digital television transmission than SDTV with at least 480p (progressive), in a 16x9 or 4x3 display and Dolby digital surround sound. 480p is the quality of most progressive scan DVDs and players. EPG: Electronic Program Guide (EPG) is an inter
22、active list of upcoming TV programming that can be transmitted along with a DTV program. Flat Panel TVs: Flat Panel TVs are very thin, lightweight TVs that are often hung on the wall. Current flat panels use either Liquid Crystal Display (LCD) or plasma screen technology. Firewire: See IEEE 1394. Fr
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