Your Home Theater System Bible

Progressive Program Scan versus Interlaced Program Scan

progressive program scan vs. interlaced program scanWatching your favourite movie or listening to the most refreshing sound tracks could be a haven for most people, especially when the day had been a taxing one, or if you would just want to spend some bonding time with those precious in your life without any distraction from outside elements and no other demanding pre-requisites such as long travels, exhausting traffic, as well as competing noises from other people finding a retreat from the restless yet ordinary necessities of day to day activities.

While just being there in front of the TV or sound system, you feel a bit tranquil as your mind is filled with energizing thoughts from the vibrant as well as appealing images that are being reinforced by the unbelievable sounds projected by your sound system.

Looking back with the quality of signals that you receive from your video system, you may wonder why viewing today is rather more gratifying than it was then. Thanks to recent innovations, things are much different now and people get to enjoy even the same programs or sounds much better with the quality of images and also the sound that are being transmitted every time you turn on the TV or the sound system, or even the computer.

No more interrupting image artefacts, intentional image blurring, inappropriate reproduction of finer details and image flickering, which are common in an interlaced scan signals that are normally emitted by older TV technology.

With the introduction of digital TV (DTV) signals such as High Density Television (HDTV), images are projected and seen as more life-like—richer and even bigger.

These are the two kinds of programming systems that video signals produce: progressive and interlaced.  Video signals are generated using horizontal lines. An intermeshed picture ties every other line and also alternates in between drawing odd lines with even lines. A progressive program scan picture pulls every line in a sequence. Consequently, a progressive scan video signal projects twice as much data than an interlaced signal every time it draws an image on the screen.

Interlaced video programming signals was the standard for televisions before the digital technology such as DVDs and HDTV became popular. Standard definition broadcasts were interlaced as it was a more effectual means to send video data through the screen. As the eyes have difficulties in identifying video interlacing, an interlaced signal that refreshes at 60 Hz (times per second) is less straining on the eyes as it produces less flicker than progressive scan signals that refreshes at 30 Hz.

Nonetheless, if a progressive scan and interlaced image are both created at 60 Hz, the progressive scan image will definitely appear slightly smoother. Video that needs to project fast motions will make such variation more perceptible. And so, the DVD as well as HDTV standards were created to support progressive scan video signals.

Consumers are presented options between units that use progressive scans or interlaced scans. This can be identified by the “p” or “i” at the end of the description (`080p or 1080i for instance). As a TV set that has the capability to project progressive scan offer a better picture, this type of signal is becoming more and more desirable than its counterpart.

In case you are deciding to purchase a new TV for your home theatre, you should consider this factor to have a better viewing and quality time any time.

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Posted on August 31, 2013 by 0 Comments Short URL


Alphonso Soosay, an accomplished musician and sound recording specialist has been in the industry for more than 30 years. In this blog Alphonso shares all his experiences and knowledge in the recording and home theatre industry. Alphonso Soosay's Blog

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