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vestigial sideband การใช้

ประโยคมือถือ
  • 8VSB is an 8-level vestigial sideband modulation.
  • Most cheaper modulators ( i . e . not intended for professional use ) lack vestigial sideband filtering.
  • In TV transmitters, both AF and VF vision modulator or at the output of the vestigial sideband stage.
  • Instead, the ATSC standard calls for 8VSB modulation, which has similar characteristics to the vestigial sideband modulation used for analogue television.
  • The only difference to the RF spectrum of the signal is that the vestigial sideband is 500 kHz wider at 1.25 MHz.
  • Analog TV uses vestigial sideband modulation ( a hybrid of AM and SSB ) for the video and frequency modulation for the audio.
  • "Professional " modulators such as those used in the CATV industry generally include vestigial sideband filtering which is generally absent on " consumer " grade modulators.
  • ISB is a compromise between double sideband ( DSB ) and single sideband ( SSB ) & mdash; the other is vestigial sideband ( VSB ).
  • In practice a technique called vestigial sideband is used to reduce the channel spacing, which would be nearly twice the video bandwidth if pure AM was used.
  • All System A transmitters used vestigial sideband transmission, with the single exception of Alexandra Palace in London, which closed down in 1957 when it was replaced by Crystal Palace.
  • In vestigial sideband, the full upper sideband of bandwidth W2 = 4.75 MHz is transmitted, but only W1 = 1.25 MHz of the lower sideband is transmitted, along with a carrier.
  • The United States has rejected several proposals to adopt the COFDM based DVB-T system for its digital television services, and has instead opted for 8VSB ( vestigial sideband modulation ) operation.
  • Japanese officials say the American system, known as 8 vestigial sideband, may be less expensive and easier to put in place but that picture quality may degrade in areas with tall buildings or mountains.
  • Standards used for terrestrial broadcast are 8-level Vestigial Sideband Modulation ( 8VSB ) for over the air, and Quadrature Amplitude Modulation ( QAM ) for cable TV . A typical example of an encodulator are the units from Thor Broadcast.
  • A single-side band ( SSB ) or vestigial sideband ( VSB ) modulation scheme would achieve almost half that bandwidth for the same symbol rate ( i . e ., twice as high spectral efficiency for the same symbol alphabet length ).