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  • Digital audio

    serch.it?q=Digital-audio

    Audio levels display on a digital audio recorder (Zoom H4n)Digital audio is audio, or simply sound, signal that has been recorded as or converted into digital form, where the sound wave of the audio signal is encoded as numerical samples in continuous sequence, typically at CD audio quality which is 16 bit sample depth over 44.1 thousand samples per second. Digital audio is the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form. Following significant advances in digital audio technology during the 1970s, it gradually replaced analog audio technology in many areas of audio engineering and telecommunications in the 1990s and 2000s. In a digital audio system, sound of an analog electrical signal is converted with an analog-to-digital converter (ADC) into a digital signal, typically using pulse-code modulation. This digital signal can then be recorded, edited, modified, and copied using digital audio workstation computers, audio playback machines and other digital tools.

  • Large Hadron Collider

    serch.it?q=Large-Hadron-Collider

    The Large Hadron Collider (LHC) is the world's largest and most powerful particle collider and the largest machine in the world. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundreds of universities and laboratories, as well as more than 100 countries. It lies in a tunnel in circumference and as deep as beneath the France–Switzerland border near Geneva. Its first data-taking period lasted from March 2010 to early 2013 at an energy of 3.5 to 4 teraelectronvolts (TeV) per beam (7 to 8 TeV total), about four times the previous world record for a collider and accelerator. Afterwards, the accelerator was taken offline and upgraded over the course of two years. It was restarted in early 2015 for its second research run, reaching 6.5 TeV per beam (13 TeV total, the present world record). At the end of 2018, it entered a second two-year shutdown period.

  • Apollo 11 missing tapes

    serch.it?q=Apollo-11-missing-tapes

    frameless frameless frameless The Apollo 11 missing tapes were those that were recorded from Apollo 11's slow-scan television (SSTV) telecast in its raw format on telemetry data tape at the time of the first moon landing in 1969 and subsequently lost. The data tapes were recorded as a backup in case the live television broadcasts failed for any reason. In order to broadcast the SSTV transmission on standard television, NASA ground receiving stations performed real-time scan conversion to the NTSC television format. The moonwalk's converted video signal was broadcast live around the world on July 21, 1969 (2:56 UTC). At the time, the NTSC broadcast was recorded on many videotapes and kinescope films. Many of these low-quality recordings remain intact. The SSTV signal was recorded on telemetry data tapes as a backup in the event that real-time conversion and broadcast failed. As the real-time broadcast worked, was shown and widely recorded, preservation of the backup video was not deemed a priority in the years immediately following the mission.

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