Overview of ARIB Technical Report (TR-B30)｜Association of Radio Industries and Businesses

Overview of ARIB Technical Report (TR-B30)

TR Number	ARIB TR-B30
Technical Report Name	The Technology Guideline of Production for Surround Broadcast Program
Enactment Date	04.26.2010
General Description	This technical report comments on technical requirements, and points to be noted for the 5.1ch surround broadcast program production.

　Keywords

Keyword	Description
Surround-sound	A natural sound field feeling that an audience is surrounded by sounds is called a surround. The surround reproduced through media is called a surround-sound. The current surround-sound is roughly classified by a matrix surround and a discrete surround. There are plural formats in each surround.
Main channel	The Main channel consists of a front channel and a surround channel. The LFE channel is not included in it.

Keyword

Description

Surround-sound

A natural sound field feeling that an audience is surrounded by sounds is called a surround.

The surround reproduced through media is called a surround-sound.

The current surround-sound is roughly classified by a matrix surround and a discrete surround. There are plural formats in each surround.

Main channel

The Main channel consists of a front channel and a surround channel. The LFE channel is not included in it.

Ver.	Amendment or Enactment Date	Amendment summary
1.3	03.24.2017	The adjustment method of the reproduction level of the monitor speaker is made adequate.
1.2	07.06.2016	When a broadcasting station produces stereophonic programs and 5.1ch surround programs, it might also produce monophonic programs at the same time by a down-mix. But the formula for the down-mixt has not been clarified. This revision clarifies it by adding a simple conversion formula. This formula adds stereo signals, then makes its level to 1/2. With this conversion, a loudness after the monophonic conversion satisfies the loudness specification in ARIB TR-B32. Also the level of the narration in the right and left channels with same phase is kept unchanged through the monophonic conversion.
1.1	03.19.2013	In ARIB STD-B21, a revision to abolish whole coefficient 1/ √ 2 at the time of the down-mix is carried out. To follow the revision, basic commentary of the down-mix for the appropriate production and operation is added in this report. Also it is revised to prevent overflow from the down-mix using the loudness and the true peak level.
1.0	04.26.2010	Enactment