Overview of ARIB Standards (STD-B33)
|STD Number||ARIB STD-B33|
|Standard Name||Portable OFDM Digital Transmission System for Television Program Contribution|
This standard specifies OFDM digital transmission system for FPU which is portable radio transmission equipment for television program contribution, and intends that television program will be contributed smoothly by the system based on this standard.
It is a precondition that when this digital transmission system is operated, analog FPU which has been already put to practical use is operated at the adjacent channel (intermingled operation by analog and digital system).
According to the report in parts about “Technical conditions on FPU/TSL by digital system in micro wave band” among the request No.110 dated on 29 November 1999 “Technical conditions on digital circuit for television program relay” in Telecommunication Technology Council of the former Ministry of Post and Telecommunications, according to “Ordinance of amending a part of Ordinance Regulating Radio Equipment (Ordinance of the Ministry of Post and Telecommunications No.49, 2000)” which was enforced on 9 August 2000 and the report in parts about (25 June 2001) “Technical conditions on digital FPU by OFDM system”, based on the items provided in “Ordinance of amending a part of Ordinance Regulating Radio Equipment (Ordinance of the Ministry of Internal Affairs and Communications No.21, 2002)” which was enforced on 28 February 2002, and in addition to them, the items which are agreed that it is desirable to be provided in operations are described in this standard.
|OFDM||Abbreviation for Orthogonal Frequency Division Multiplex
OFDM is one of the systems that transmit digitized information. Comparing the conventional method which all information is modulated fast by one carrier, OFDM transmits by dividing information to thousands carriers. Looking at each carrier, as the time to transmit a mass of digital data of 1 and 0 becomes thousands times, the transmission characteristics which is resistant to multi-path interference is acquired.
Because of the mechanism that multiple carriers do not interfere each other (orthogonal multiplex), this is called OFDM.
|FPU||Abbreviation for Field Pick-up Unit
Radio transmission channel that transmits video and audio materials of television program from the covering scene to broadcasting studio, either directly or through TSL
|TSL||Abbreviation for Transmitter to Studio Link
Transmission channel that links signal from FPU to broadcasting studio
|STL||Abbreviation for Studio to Transmitter Link
Radio transmission channel that transmits television program by linking broadcasting studio to transmitting station and so on
|TTL||Abbreviation for Transmitter to Transmitter Link
Radio transmission channel that transmits television program by linking transmitting station to transmitting station
2. Amendment History
|Ver.||Amendment or Enactment Date||Amendment summary|
|1.2||03.28.2011||In order to shorten transmission delay time, the provision related to time interleave and TMCC is added. Notation of FORWARD is unified, and misprints in Table 3-4 are corrected.|
|1.1||11.30.2005||According to the amendment of the standard concerning the allowance of strength of spurious emission, definition of the spurious emission, etc., allowance, interim measures, method of measurement are amended and so on.|