High Def Forum
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What is the diff.between HD & Digital?

JackTV
05-08-2008, 06:37 PM
Hey All,
Is Digital the same as HD?
Or is HD it's own thing? I am really confused!!!!

Help Me,
Jack

Scottnot
05-08-2008, 06:43 PM
Digital is simply the means by which data (picture information) is modulated onto the RF carrier frequency.
It can be either SD (standard definition) or HD (high definition).

HD is a high resolution picture usually in one of the standard high definition formats (either 1280x720 pixels or 1920x1080 pixels) as compared to the SD format which is 720x480 pixels.

BrianO
05-08-2008, 11:18 PM
Digital is simply the means by which data (picture information) is modulated onto the RF carrier frequency.
It can be either SD (standard definition) or HD (high definition).

HD is a high resolution picture usually in one of the standard high definition formats (either 1280x720 pixels or 1920x1080 pixels) as compared to the SD format which is 720x480 pixels.

Digital SD is broadcast as either 640x480 (aspect ratio of 4:3) or 704x480 (AR of 4:3 or 16:9). 720x480 is used with SD DVDs.

QuantumIguana
05-15-2008, 08:56 AM
HDTV is a type of Digital TV. All HDTV is digital, but not all digital TV is HDTV. Some digital channels are broadcast in HD, some are broadcast in SD. For example, the local PBS station, channel 2 in Minneapolis is broken into 2.1, the SD digital channel, and 2.2, the HD channel. Often they play the same programming, but sometimes they have different programming. The SD digital channel looks pretty good, but the HD channel looks stunning. The local ABC station has 5.1, the standard ABC channel in HD, and 5.2, which is local news. Adding an SD digital channel allows a station to put out more programming in the allocated space.

But if you're still confused about analog vs. digital, let me use an analogy. A vinyl record is analog, it represents the sounds with variations of the grooves on the record. Your CD and MP3 players are digital, they store the data using 1's and 0's. HDTV is like CD-quality music. Digital SD is like a highly compressed MP3 file - not bad, but not as good as a CD.

Scottnot
05-15-2008, 01:35 PM
While we're at it, might as well make another point clear.

While all OTA (over-the-air) HD content is digital, once the signal gets into your house things change a bit.

A HD signal can be sent from your STB (set-top-box) to you TV using either a digital signal on digital cables (HDMI or DVI), or an analog signal on analog cables (Component).

oblioman
05-15-2008, 08:12 PM
And if you use HDMI - DVI - or component, you will not notice a difference. HDMI carries video & audio in one cable. DVI carries video in one cable but you must also have audio cables from source to out. Component carries video over 3 cables andalso needs an audio source. Me favorite is component then DVI. HDMI is becoming the standard but still lacky in response.

fryet
05-22-2008, 03:28 PM
If the above answers were not clear enough, here are some more answers.

Is HD digital? Yes.
Are all digital pictures HD? No.

Scottnot
05-22-2008, 06:41 PM
If the above answers were not clear enough, here are some more answers.

Is HD digital? Yes.
Are all digital pictures HD? No.
Is HD Digital? Yes. Well, almost always.
As I posted earlier, if you mean broadcast (OTA), that is correct.

If you are talking about transmission from a STB or a Receiver to the TV, HD content can be sent over Component cables which are analog.