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  2. 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. It is used in most digital media, including digital images ...

  3. Permanent time observation in the United States - Wikipedia

    en.wikipedia.org/wiki/Permanent_time_observation...

    Permanent DST in the US was briefly enacted by president Richard Nixon in January 1974, in response to the 1973 oil crisis. [19] The new permanent DST law was retracted within the year. [ 1 ] [ 2 ] [ 42 ] [ 43 ] Year-round daylight saving time was initially supported by 79% of the public, but that support had dropped to 42% after its first winter.

  4. Discrete sine transform - Wikipedia

    en.wikipedia.org/wiki/Discrete_sine_transform

    In mathematics, the discrete sine transform (DST) is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using a purely real matrix.It is equivalent to the imaginary parts of a DFT of roughly twice the length, operating on real data with odd symmetry (since the Fourier transform of a real and odd function is imaginary and odd), where in some variants the input and ...

  5. Daylight saving time - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time

    Daylight saving time ( DST ), also referred to as daylight saving (s), daylight savings time, daylight time ( United States and Canada ), or summer time ( United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time ...

  6. UTC offset - Wikipedia

    en.wikipedia.org/wiki/UTC_offset

    The UTC offset is the difference in hours and minutes between Coordinated Universal Time (UTC) and local solar time, at a particular place. This difference is expressed with respect to UTC and is generally shown in the format ± [hh]: [mm], ± [hh] [mm], or ± [hh]. So if the time being described is two hours ahead of UTC (such as in Kigali ...

  7. Lille, Alberta - Wikipedia

    en.wikipedia.org/wiki/Lille,_Alberta

    Lille is a ghost town and former village in the Crowsnest Pass area of southwest Alberta, Canada.It was a company-built coal mining community that, between 1901 and 1912, hosted a population that grew to over 400.

  8. Daylight saving time in the Americas - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_in...

    DST ends on the second Sunday of March and starts on the third Sunday of October. In 2007, DST started on October 15, 2006, and ended on March 11, 2007. In 2010, Paraguay changed its own DST rules because of the energy crisis, ending DST on the second Sunday in April, a month later than previous years. The start date remains unchanged.

  9. Daylight saving time by country - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_by...

    Daylight saving time by country. Daylight saving time (DST), also known as summer time, is the practice of advancing clocks during part of the year, typically by one hour around spring and summer, so that daylight ends at a later time of the day. As of 2024, DST is observed in most of Europe, most of North America and parts of Africa and Asia ...

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