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  2. Compression artifact - Wikipedia

    en.wikipedia.org/wiki/Compression_artifact

    Statistically, images have more low-frequency than high-frequency content, so it is the low-frequency content that remains after quantization, which results in blurry, low-resolution blocks. In the most extreme case only the DC-coefficient, that is the coefficient which represents the average color of a block, is retained, and the transform ...

  3. Signal-to-noise ratio - Wikipedia

    en.wikipedia.org/wiki/Signal-to-noise_ratio

    It is often possible to reduce the noise by controlling the environment. Internal electronic noise of measurement systems can be reduced through the use of low-noise amplifiers. When the characteristics of the noise are known and are different from the signal, it is possible to use a filter to reduce the noise.

  4. Noise figure - Wikipedia

    en.wikipedia.org/wiki/Noise_figure

    The noise power from a simple load is equal to kTB, where k is the Boltzmann constant, T is the absolute temperature of the load (for example a resistor), and B is the measurement bandwidth. This makes the noise figure a useful figure of merit for terrestrial systems, where the antenna effective temperature is usually near the standard 290 K ...

  5. Channel 30 low-power TV stations in the United States

    en.wikipedia.org/wiki/Channel_30_low-power_TV...

    The following low-power television stations broadcast on digital or analog channel 30 in the United States: [1] [2] [3] [4]. K30AE-D in Alva, Oklahoma; K30AF-D in ...

  6. 22.2 surround sound - Wikipedia

    en.wikipedia.org/wiki/22.2_surround_sound

    22.2 or Hamasaki 22.2 (named after Kimio Hamasaki, a senior research engineer at NHK Science & Technology Research Laboratories in Japan) is the surround sound component of Super Hi-Vision (a new television standard with 16 times the pixel resolution (7680×4320) of HDTV (1920x1080).

  7. Hallmark Channel - Wikipedia

    en.wikipedia.org/wiki/Hallmark_Channel

    The network's made-for-TV movies are characterized as family-friendly and inspirational, ranging from holiday-themed films to westerns. In the early stages of the channel's development, Hallmark Channel had a steady one-movie-a-month, or 12-a-year, production schedule with the films mainly being produced by RHI Entertainment .

  8. Rumble (noise) - Wikipedia

    en.wikipedia.org/wiki/Rumble_(noise)

    A rumble is a continuous deep, resonant sound, such as the sound made by heavy vehicles or thunder. [1] In the context of audio reproduction rumble refers to a low frequency sound from the bearings inside a turntable. This is most noticeable in low quality turntables with ball bearings. Higher quality turntables use slide bearings, minimizing ...

  9. Low-frequency effects - Wikipedia

    en.wikipedia.org/wiki/Low-frequency_effects

    LFEs include both low-pitched musical notes and low-pitched sound effects. The musical soundtrack for many films includes bass instruments that produce very low notes. . Until the 1970s, most of the low-pitched instruments were natural, acoustic instruments, such as the double bass or the pipe organ's pedal key