What is mpeg noise reduction




















Both materials are incredibly good at their jobs; they insulate incredibly well but also have the coveted noise-reducing properties that many homeowners are seeking. One way to isolate an area is to install dense music room soundproofing products. Their heavy mass blocks the sound. Another way to isolate your practice area is to create air space between walls and reduce the number of contact points between building materials.

Major cost factors include the materials, size of the room and surfaces requiring soundproofing. Skip to content Users questions. April 27, Joe Ford. Table of Contents.

Noise—sometimes called "snow" due to the appearance of black and white dots in the picture—was a bigger issue with older analog TVs, and especially with lower-definition analog signals. And, yes, when TVs upconvert video signals from low-quality sources you may still see some noise. But for the most part, you're getting much cleaner, higher-quality digital source content these days, whether you're using over-the-air digital broadcasts, high-def signals from cable and satellite TV services, streaming service signals, or pristine video from Blu-ray discs.

The problem with engaging noise reduction is that it comes at the expense of detail and fine texture—these tend to get smoothed over when the feature is active. The picture can get soft-looking. Turn off noise reduction and you'll have more picture detail and a more natural-looking image. What it really does is artificially boost fine detail and texture, while accentuating the edges of images.

At first glance this might give the impression of greater detail, but what it's actually doing is masking fine detail—and oversharpened images can add a halo around objects. So turn it way down or completely off. Note: Some models have a zero setting in the center of the control, so lowering it beyond that point might actually soften the image.

One issue with LCD-based TVs, in particular, is that the image can blur during fast-moving scenes, such as in action movies or sports. TV manufacturers use various technologies to reduce motion blur, including repeating frames or inserting black frames into the video signal.

Many companies tie these efforts to another technology, called judder reduction, which is often referred to as motion smoothing. Movies have a slightly stuttering effect, called judder, especially when the camera pans across a scene. This appearance comes about because movies and a lot of prime-time TV shows are shot at a relatively slow 24 frames per second, or 24Hz.

By contrast, video is typically shot at 60Hz. That's why sports, reality and game shows, and soap operas have smoother motion than 24Hz films.

Motion smoothing also attempts to reduce judder by increasing the TV's frame rate via a process called frame or motion interpolation. The TV analyzes adjacent video frames, making an educated guess as to what the in-between frames would look like if they'd been captured, and then inserts those new frames into the video stream. But when motion smoothing is activated during a movie, it removes the normal film cadence and can make even classic, gritty films look like video, something referred to as "the soap opera effect.

Many sets with Hz and higher refresh rates let you turn off motion smoothing separately from blur reduction. Do that if you can. However, in some televisions the two effects are tied together, so you can't get one without the other. In that case, turning the feature off is probably your best bet. Filmmaker Mode, mentioned above, helps eliminate the soap opera effect. When it's active, the TV will shut down many of these effects—including motion smoothing—automatically when it detects a movie is playing.

I've been a tech journalist for more years than I'm willing to admit. In my spare time I build and play guitars and bass, ride motorcycles, and like to sail—hobbies I've not yet figured out how to safely combine. We respect your privacy.



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