Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV
There was a time when we had only one choice while buying a TV, i. and conventional Analog TV or CRT TV. But today we have so many choices. First of all we have our conventional CRT (cathode ray tube) TV. Along with this we have new choices like Hdtv, EDTV, and SDTV. But what is right for you? What are the main differences in them? Let's try to understand the very basics about each of them.
Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV
Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV
Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV
Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV
Conventional Analog TV:
First of all let's talk about our conventional CRT TV. Video screens of CRT TVS contain 525 lines of resolution, although only 480 lines are displayed. These lines get painted with "interlacing" technique. In this technique first it paints all the odd numbered lines from 1 to 479. Immediately after that it paints all even numbered lines from 2 to 480.This standard analog TV format represents as interlaced or 525 525i, this also represents with term "480i". The aspect ratio of the screen is 4: 3. This TV has inbuilt NTSC tuner, so by default they can't tune Digital TV broadcast.
Analog TV:
With NTSC broadcasting was dominating since last 50 years. But it is time when DTV (Digital TV) gradually replacing the Analog one. Digital television is a new type of broadcasting technology that offers television with movie-quality pictures and Dolby digital surround sound, along with a variety of other enhanceMents. This works with ATSC Digital TV broadcasting instead of NTSC. Currently there are three types of broadcast digital SDTV, EDTV signal: and Hdtv. Aspect ratio for DTV is 16: 9.
SDTV:
Like Analog TV, SDTV also480i. Here's the advanTAGe compared to Analog-SDTV can receive digital broadcast signals.
EDTV:
So far 480i resolution TVs worked fine. That is because TVs sizes are limited to 19 inch or 20 inch. But limitation of 480i resolution surfaced when same technology applies in large screen. Interlacing techniques does not work for larger screen. The visible scan lines and jaggies are annoying. The best solution is to avoid interlacing. Interlacing was Initially invented to save transmission bandwidth. But in current technology in much higher transmission rate is possible. I know, there is no need of interlacing. It is possible to paint the lines sequentially from 1.2, 3 .... up to 480, this is called "progressive scanning." With this technology using same resolution 480 lines we canget better video quality, jaggies can be totally eliminated. This 480 lines progressive scan technique is commonly known as 480 p. This concept in the consumer market is known as Enhanced Definition Television, or EDTV.
Both SDTV and EDTV also receive the 16-by-9 broadcasts along with the 4-by-3 aspect ratio.
Basic Comparison: AnalogTV, SDTV, EDTV, and HDTV