SDR

SDR may refer to:

Places

  • Santander, Cantabria
  • Santander Airport, IATA airport code
  • Somalia, previously known as the Somali Democratic Republic
  • Southern Distributor Road, part of the Newport ring road in the United Kingdom
  • Snailbeach District Railways, a mine railway in Shropshire, England
  • Somerset and Dorset Joint Railway, defunct British railway system
  • São Domingos de Rana, a parish in Cascais, Portugal

    • Reports and reviews

  • Strategic Defence Review, a United Kingdom Ministry of Defence defence review
  • System Design Review, a scheduled review which ensures continuous involvement throughout a program
  • Swiss Derivatives Review, a magazine for the futures and options industries

    • Economics, maths and science

  • System of distinct representatives, in mathematics
  • Special drawing rights, in the International Monetary Fund
  • Social discount rate, a measure of the value of diverting funds to social projects
  • Selective dorsal rhizotomy, a neurosurgery
  • Standardised death rate

    • Technology

  • ETSI Satellite Digital Radio
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/SDR

    XDR (audio)

    XDR (eXtended Dynamic Range, also known as SDR (Super Dynamic Range)) is a quality-control and duplication process for the mass-production of pre-recorded audio cassettes. It is a process designed to provide higher quality audio on pre-recorded cassettes by checking the sound quality at all stages of the tape duplication process. In this way, the dynamic range of audio recorded on an XDR-duplicated cassette can be up to 13 decibels greater.

    History

    XDR was originally developed by Capitol Records-EMI of Canada in 1982 as "SDR" (Super Dynamic Range). Capitol in the USA then adopted the system for its cassette releases that same year, renaming it "XDR".

    Process

    The XDR/SDR process involves many steps, the most prominent being:

  • Duplication of the cassettes from a 1" wide master loop tape mounted in a loop bin duplicator (as opposed to standard cassette duplication using a 1/2" master loop tape), resulting in clearer high frequencies, greater bass response, and less noise.
  • Recording a short test toneburst at the beginning and end of the program material on the cassette, to detect for any loss of audio frequencies in the audio spectrum. The toneburst consists of 11 tones about 0.127 seconds in length (with 0.023 seconds of silence in-between each tone), of the following estimated sinewave tones:
    32Hz, 64Hz, 128Hz, 256Hz, 512Hz, 1000Hz, 2000Hz, 4000Hz, 8820Hz, 11,025Hz, 18,000Hz
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/XDR_(audio)

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