digital TV

Willow
Willow Posts: 11,064
edited November 2004 in Electronics
what makes a TV digital (may sound dumb)
Post edited by Willow on
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  • McLoki
    McLoki Posts: 5,231
    edited October 2004
    Non-technical, but I would proclaim a digital TV as one that will:

    1) Display signals in a higher resolution than standard TV. (480p, 720p or 1080i)

    2) Will up convert a standard TV signal into at least 480P. (i.e. will not display at standard TV resolutions)

    Keep in mind both comments are opinion only and based on no fact that I can substantiate without writing it again. :D

    Michael
    Mains.............Polk LSi15 (Cherry)
    Center............Polk LSiC (Crossover upgraded)
    Surrounds.......Polk LSi7 (Gloss Black - wood sides removed and crossovers upgraded)
    Subwoofers.....SVS 25-31 CS+ and PC+ (both 20hz tune)
    Pre\Pro...........NAD T163 (Modded with LM4562 opamps)
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  • Frank Z
    Frank Z Posts: 5,860
    edited October 2004
    A Digital TV is capable of receiving a Digital Broadcast.
    An Anolog TV can only receive an analog signal (NTSC)......
    Just go here.
    9/11 - WE WILL NEVER FORGET!! (<---<<click)
    2005-06 Club Polk Football Pool Champion!! :D
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  • Willow
    Willow Posts: 11,064
    edited October 2004
    thank you for the link
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  • LittleCar_w/12s
    LittleCar_w/12s Posts: 568
    edited October 2004
    Digital TV is just a digital (1's and 0's) that is received by your TV, or box, and then decoded to the analog signal to go to the tube, etc. It is relatively impervious to interference, as it is just on or off as a signal... When analog tv signals get messed with, we SEE the results very clearly (or un-clearly)

    It's the generally same difference as using a computer monitor with the standard cable, or one that uses DVI (digital video) cable, but keep in mind that analog signal to your TV has to travel sometimes HUNDREDS of miles, that's why digital was released. I sure hope they have built a good digital standard for it, else we'll be throwing out our recievers every few years. Analog is analog, no decoding, and sometimes simple is better.
    ___________________________
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  • therockman
    therockman Posts: 349
    edited October 2004
    Originally posted by LittleCar_w/12s
    Digital TV is just a digital (1's and 0's) that is received by your TV, or box, and then decoded to the analog signal to go to the tube, etc. It is relatively impervious to interference, as it is just on or off as a signal... When analog tv signals get messed with, we SEE the results very clearly (or un-clearly)

    It's the generally same difference as using a computer monitor with the standard cable, or one that uses DVI (digital video) cable, but keep in mind that analog signal to your TV has to travel sometimes HUNDREDS of miles, that's why digital was released. I sure hope they have built a good digital standard for it, else we'll be throwing out our recievers every few years. Analog is analog, no decoding, and sometimes simple is better.


    Actually an analog VHF signal only has a maximum travel distance of about 75 miles according to the FCC regulations. And as far as a digital signal is concerned, there is a lot of digital distortion even after a mere 40 miles. Digital distortion is seen as the screen showing entire lines of color bars at random spots on the screen, or the tell-tale sign of random lines of "blue in the sky" or even the entire picture going to "blue in the sky" momentarily. Analog distortion is much more subtle than digital distortion, which can cause entire frames or even sections of a broadcast to disappear.

    Rocky Bennett
    Rocky Bennett
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  • TheGrayGhost
    TheGrayGhost Posts: 196
    edited October 2004
    As you can see from the response that you have gotten “Digital TV” means different things to different people.

    Is a direct view (CRT) TV with Digital tuner a digital TV? It is a High Definition TV (HDTV) because it can display resolutions above the SDTV resolution of 480i, but in my opinion is not truly a digital TV because the digital signal at the receiver must be converted to an analog RGB signal to drive the tube, or tubes in the case of a rear projection HDTV.

    A true digital TV will maintain the digital signal all the way to the light engine such as the DLP and LCD HDTVs.
    Best Regards, Cliff
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  • therockman
    therockman Posts: 349
    edited October 2004
    Originally posted by TheGrayGhost
    As you can see from the response that you have gotten “Digital TV” means different things to different people.

    Is a direct view (CRT) TV with Digital tuner a digital TV? It is a High Definition TV (HDTV) because it can display resolutions above the SDTV resolution of 480i, but in my opinion is not truly a digital TV because the digital signal at the receiver must be converted to an analog RGB signal to drive the tube, or tubes in the case of a rear projection HDTV.

    A true digital TV will maintain the digital signal all the way to the light engine such as the DLP and LCD HDTVs.

    By FCC definition, a digital TV is a television with a digital tuner.
    Rocky Bennett
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  • TheGrayGhost
    TheGrayGhost Posts: 196
    edited October 2004
    Originally posted by therockman
    By FCC definition, a digital TV is a television with a digital tuner.

    I did say "in my opinion", but that is only because I work at the circuit board level in DTV.
    Best Regards, Cliff
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  • PolkThug
    PolkThug Posts: 7,532
    edited November 2004
    UGH! This is a huge misconception. There are SIGNALS that are digital or analog, and their are DISPLAYS that are digital or analog. Some TV's can receive a digital signal, but display in analog.

    CRT's are not digital!


    Digital TV's: Plasma, LCD, DLP

    Analog TV's: Tubes, CRT RPTV


    Just because a TV has a digital signal going into it does not make the TV's display digital. CRT's are an analog device.

    Regards,
    PolkThug
    Never Forget
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  • Toxis
    Toxis Posts: 5,116
    edited November 2004
    Originally posted by PolkThug
    UGH! This is a huge misconception. There are SIGNALS that are digital or analog, and their are DISPLAYS that are digital or analog. Some TV's can receive a digital signal, but display in analog.

    CRT's are not digital!


    Digital TV's: Plasma, LCD, DLP

    Analog TV's: Tubes, CRT RPTV


    Just because a TV has a digital signal going into it does not make the TV's display digital. CRT's are an analog device.

    Regards,
    PolkThug
    Finally... someone who has it right. I was about ready to make a huge post myself. Thanks PolkThug for pointing out the truth...
    Never kick a fresh **** on a hot day.

    Home Setup: Sony VPL-VW85 Projo, 92" Stewart Firehawk, Pioneer Elite SC-65, PS3, RTi12 fronts, CSi5, FXi6 rears, RTi6 surround backs, RTi4 height, MFW-15 Subwoofer.

    Car Setup: OEM Radio, RF 360.2v2, Polk SR6500 quad amped off 4 Xtant 1.1 100w mono amps, Xtant 6.1 to run an eD 13av.2, all Stinger wiring and Raammat deadener.
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  • McLoki
    McLoki Posts: 5,231
    edited November 2004
    CRT's are not digital!

    I dont think this is true. I currently have a panasonic CRT (tube) tv that is digital. The current version can be seen here.

    Even though it is a 4:3 TV it displays widescreen images in true widescreen (compresses the signal so the entire 480p image is displayed in 16:7). My TV has the classic digital image that, when you get close to it, seems to be made up of alot of tiny dots, not alot of small rectangles like a standard TV. (bad description but stop by Circut City or Best Buy and you will see what I mean. - just get really close to the TV and you can tell if it image is being upconverted to a digital format or not.)

    It is possible I am just missing your point here, but I know my CRT upconverts all signals to 480 (I think p) and can natively display 480P (progressive scan DVD) and is supposed to be able to display 1080i (I don't have a true HD signal going to the TV to test this one though).

    I think it really must all come down to this.
    As you can see from the response that you have gotten “Digital TV” means different things to different people.
    Mains.............Polk LSi15 (Cherry)
    Center............Polk LSiC (Crossover upgraded)
    Surrounds.......Polk LSi7 (Gloss Black - wood sides removed and crossovers upgraded)
    Subwoofers.....SVS 25-31 CS+ and PC+ (both 20hz tune)
    Pre\Pro...........NAD T163 (Modded with LM4562 opamps)
    Amplifier.........Cinepro 3k6 (6-channel, 500wpc@4ohms)
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  • HBombToo
    HBombToo Posts: 5,256
    edited November 2004
    I just purchased this little omni from the following link:

    http://www.cmnc.com/home.htm

    I was not looking for it but doing a bit of research on smart antennas for my company while playing on the Andrew web site.

    Prior to purchasing it I has phased a pair of rabbit ear antenna's and was able to tune in the big 3 but still had some margin problems. If I played around with azimuth orientation of the ears I could sometimes get a couple of other digital broadcasts in the KC metro area but never really gave it much thought.

    After setting this antenna up late last night while watching the poles I immediatly overcame all magin issues and now I pick up every dt broadcast available. The omni is perched on top of my right front RTA15Tl, "for now", until I get it installed. I found this is the best position because it is the rear wall of the house and outside the clutter.

    just thought I'd share.

    HBomb
    ***WAREMTAE***
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  • PolkThug
    PolkThug Posts: 7,532
    edited November 2004
    Originally posted by McLoki
    I dont think this is true. I currently have a panasonic CRT (tube) tv that is digital. The current version can be seen here.

    A cathode-ray tube (CRT) is inherently analog. It must receive signals of varying frequency, NOT an "on or off" transmission.

    Inside your TV, there is a digital to analog conversion.

    Regards,
    PolkThug
    Never Forget
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