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  2. Data compression - Wikipedia

    en.wikipedia.org/wiki/Data_compression

    Compression ratios are around 50–60% of the original size, [48] which is similar to those for generic lossless data compression. Lossless codecs use curve fitting or linear prediction as a basis for estimating the signal. Parameters describing the estimation and the difference between the estimation and the actual signal are coded separately.

  3. Discrete cosine transform - Wikipedia

    en.wikipedia.org/wiki/Discrete_cosine_transform

    A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies.The DCT, first proposed by Nasir Ahmed in 1972, is a widely used transformation technique in signal processing and data compression.

  4. High-Efficiency Advanced Audio Coding - Wikipedia

    en.wikipedia.org/wiki/High-Efficiency_Advanced...

    Orban Opticodec-PC Streaming and File Encoders were the first commercially available encoders supporting AAC-LC/HE-AAC back in 2003. They are now deprecated and replaced with StreamS Encoders from StreamS/Modulation Index with many more features, including support xHE-AAC/Unified Speech and Audio Coding. They are now in use at some of the ...

  5. Large language model - Wikipedia

    en.wikipedia.org/wiki/Large_language_model

    A large language model (LLM) is a type of machine learning model designed for natural language processing tasks such as language generation.As language models, LLMs acquire these abilities by learning statistical relationships from vast amounts of text during a self-supervised and semi-supervised training process.

  6. Comparison of mobile operating systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mobile...

    Advanced controls Feature Android iOS Tizen Sailfish OS Ubuntu Touch HarmonyOS; While-in-use permissions 10+ 11+: Location only [36]: No: No: Yes: 3.0+ Per-app Internet access

  7. Smartphone - Wikipedia

    en.wikipedia.org/wiki/Smartphone

    In March 1996, Hewlett-Packard released the OmniGo 700LX, a modified HP 200LX palmtop PC with a Nokia 2110 mobile phone piggybacked onto it and ROM-based software to support it. It had a 640 × 200 resolution CGA compatible four-shade gray-scale LCD screen and could be used to place and receive calls, and to create and receive text messages ...

  8. Home cinema - Wikipedia

    en.wikipedia.org/wiki/Home_cinema

    A more expensive home cinema set-up might include a Blu-ray disc player, home theater PC (HTPC) computer or digital media receiver streaming devices with a 10-foot user interface, a high-definition video projector and projection screen with over 100-inch (8.3 ft; 2.5 m) diagonal screen size (or a large flatscreen HDTV), and a several-hundred ...