Whats difference between HD-READY and FULL-HD

What is difference b/w 1080i and 1080p ?

Santosh, this actually needs a very detailed explanation. I am writing an article that I will publish soon. In the meantime, here is a quick explanation.

The 'i' after the 1080 refers to Interlaced, while 'p' refers to Progressive. Both are methods to display an image on a TV display.

The film that you see in a movies hall consists of a reel of still pictures. Each picture is called a frame. Each successive frame differs from the previous frame in small way. For example, if a man is walking, the first frame will display an image of the man in the starting position. The second frame will display the mans image with the legs and hands in a slightly different position. When all these frames are shown quickly one after the other, you eye perceives the still pictures as motion. This method of moving the still frames one after the other is termed as Frames Per Second or fps.

The human eye can perceive motion at 16 fps, but Hollywood, for various historical reasons, had adopted 24 fps as the standard frame rate for all movies.

In a film that you see in a movie hall, each still picture fills the entire frame. This is called progressive source. This means that the frame rate is the number of individual full pictures. In the came of film this is exactly 24,

INTERLACED

In the initial days of TV, there was no way to display a full frame on a Cathode Ray Tube or CRT screen, This is an analogue device. In all CRT monitors, the image is painted on the screen by an electron beam that scans from one side of the display to the other drawing thin lines. This scan is used to display the transitions in color, intensity and pattern, and each complete pass of the electron gun is called a FIELD. A field will consist of 'n' number of scanned lines. Analogue TV uses a process that relies on the brain's ability to integrate gradual transitions in pattern that the eye sees as the image is painted on the screen. Each picture or frame on a television screen is composed of 525 lines, numbered from 1 to 525. During the first phase of screen drawing, even-numbered lines are drawn - 2,4,6,8 and so on. During the next phase, the odd lines are drawn 1,3,5,7 and so on. The eye integrates the two images to create a single image. See picture below. The fields are said to be interleaved together or interlaced. A frame or complete picture consists of two fields. Like with film, each picture is from a different moment in time. Unlike film, the rate of individual pictures, or fields, is twice the frame rate.

Though modern television are not made this way any more, and modern LCD and Plasma TVs can display a full frame, remember the TV production and broadcast systems have been designed around the FIELD concept and is entrenched around the world.

There are two dominant interlaced scan systems used in the world today - NTSC and PAL.

NTSC is based on a 525-line, 60 fields/30 frames-per-second at 60Hz system for transmission and display. . This is an interlaced system in which each frame is scanned in two fields of 262 lines each, which is then combined to display a frame of video with 525 scan lines. NTSC is used in the U.S., Canada, Mexico, some parts of Central and South America, Japan, Taiwan, and Korea.

PAL is based on a 625 line, 50 field/25 frames a second, 50HZ system. The signal is interlaced, like NTSC, into two fields, composed of 312 lines each. PAL is used in the U.K., Germany, Spain, Portugal, Italy, China, India, most of Africa, and the Middle East.

PROGRESSIVE SCANNING

In progressive scan the image is displayed on a screen by scanning each line (or row of pixels) in a sequential order. In other words, in progressive scan, the image lines are scanned in numerical order (1,2,3) down the screen from top to bottom, In NTSC for example, by progressively scanning the image onto a screen every 60th of a second rather than "interlacing" alternate lines every 30th of a second, a smoother, more detailed, image can be produced on the screen,

While film only has progressive frames, and analog video only interlaced fields, digital video may have either or both. In the digital domain, displaying progressively is a property separate from the contents of the frame. Although it's possible to encode and store interlaced video as a stream of fields, most interlaced video is encoded in pairs in the form of frames. As a rule, frame based interlaced encoding is less efficient than progressive encoding. This means that files with comparable bit rates will have lower quality if they contain interlaced video.

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Venkat, Thanks for taking time for giving replies to my queries.

For Onkyo tsxr606 which I've shortlisted the video scaling specification given is 720p/1080i.

I'm planning to have a Sony KLV-32W400A , Full HD 1080 for display.

A comparitive study with denon avr 1909 shows a video scaling of 1080p.

As explained in ur reply the methodology for display is different in both the cases, what impact it will have on the viewership quality with the above configuration i've shortlisted, will it be the same and cannot be differentiated or sutle difference might be there?

I've read in one of the reviews that tsxr 606 will allow the 1080p signal to pass thru or player can be connected directly to the tv and avr can be used for the audio. pls comment.

Santosh, before Venkat gives you a proper well-informed reply, let me throw in my not so well-informed two cents.

Firstly, at 32 inches you will struggle to differentiate between 1080i and 1080p or 720p and 1080p, even if we're talking about native HD signals. Venkat has a lovely post in this thread where he explains the reasons for this including the acuity of vision. There is also an interesting CNET article on the topic.

Secondly, upscaling is just...well.....pseudo-HD.....it's an attempt to using some mathematics.....to convert an SD image into an HD image.

Thirdly, your display will upscale all signals that it receives to 1080p.

With these three factors in mind, I very seriously doubt you'll miss 1080p upscaling on your AVR. Now even if you're an exceptional person who will be able discern some difference, the 1080p pass-through on the 606, or directly connecing your source to your display, should take care of the issue.

So, in my personal view the buying decision for AVRs shouldn't be based on this factor alone. If anything, you can use this as a tie-breaker in case both units come up level in your estimation for your use.

Thanks

Your point on 32 " is well noted, 40" are expensive 1.19 lacs.

Either I should increase my budget which is already stretched or I'll have to wait for the prices to come down.

Thanks once again.

Santosh

Psychotropic, you took the words out of my keyboard.

Cheers

Santosh, unless Full HD is a must-have, you could maybe consider what I'm doing.....ie going for Plasma.....42" Samsung 410 at 55.5k, Samsung 450 at 61k (or less), Panasonic PV8H for about 65k, are the bottom end of the good options, with presumably more quality as you go up the price-scale. I did consider spending similar amounts on a Full HD 37 inch (Samsung 5 series), but the wow-factor of 42 inches of screen real estate is really nice

If you'd rather stick to 32" then I do think you can consider dumping Full HD and using that extra money for some other part of your setup.....yes, the 32W400 is a lovely TV set, and you probably won't regret buying it, but 60k is a fair bit of money to spend on a 32 incher these days.