Technology focus: TV frame rates ame Samsung LED TV D8000
number of actual interpolated frames and how backlighting is involved, if at all. Sometimes, both are combined to push Hz values higher. For Chris Moseley, AV product manager at Samsung, “The way that we’re rating screens now is called CMR – clear motion rating. It’s measured in Hertz but plasma and LCD don’t work using the same system. The CMR basically says 200 is better than 100, 400 is better than 200, 800 is better than 400. The 8000 series has a CMR of 800, because it has other technologies, not just the panel rate but local dimming and frame interpolation.”
“Due to the short viewing time customers have to evaluate the picture quality in-store, many settings on the TV are not ideal for home use. This is a good point to mention during discussions with the customer, that TVs can be set to their own preferred setting to suit their own home surroundings.”
According to Sam Johnson, there can be side effects: “Interpolation techniques estimate what the picture content should be and if inaccurate can cause unwanted distortions. Higher frame rates can improve fast motion but have to be judged against any detrimental effect, which may be dependant on the viewer’s personal preference.”
Moving pictures Feature films use 24 frames per second (fps) and therefore differ slightly from the usual TV rate of 25fps. Here motion interpolation can create a rather artificial look. Increasingly, media players such as Blu-ray hardware, can output movies at an unaltered 24fps.
“Smooth motion technology has been devised to balance the look of film so it appears in the way that most people are used to seeing TV images [at 50Hz],” says Steve Lucas. “However, some film enthusiasts are happy to see the movie displayed at cinema frame rate.” Even this could be set to evolve. Peter Jackson’s forthcoming The Hobbit is being shot at 48fps, however, current Blu-ray players and TVs may be unable to take full advantage of that.
The Hobbit picture: Photo by James Fisher © New Line Cinema, MGM & Warner Bros
Loewe Individual 46 Compose 3D TV
Ultimately the modes that a viewer uses depends largely on taste. “Manufacturers are setting the picture to the shop environment where the picture is optimised for that particular backdrop,” says Steve Lucas. “Due to the short viewing time customers have to evaluate the picture quality in-store, many settings on the TV are not ideal for home use. This is a good point to mention during discussions with the customer, that TVs can be set to their own preferred setting to suit their own home surroundings.” ■
October 2011 The Independent Electrical Retailer 21
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