Volume meter

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The loudness meter is one of the level meters . It is not used to measure the acoustic volume , but to control the modulation of audio levels.

Loudness measurement algorithm according to ITU Rec. BS.1770-1

Volume fluctuations in television and radio programs can not be detected with the commonly used level meters such as PPM and VU meters and therefore cannot be avoided. If you level different dynamic recordings to "full level" after one of these measuring devices and listen to them one after the other, they are perceived as differently loud. An example is the volume difference between advertisements and 8 p.m. news on the public television channels.

The measurement of the subjectively perceived volume (by the human ear) requires a generally recognized measurement method. A possible solution are volume meters in accordance with current standards according to ITU Rec. BS.1770 and BS.1771. This measuring method has not yet been internationally recognized.

equipment

There are already several manufacturers whose measuring devices support the ITU Rec. BS.1770 / BS.1771 volume measurement method, for example DK Technologies, RTW and Pinguin (Ingenieurbüro Pinguin).

Devices whose functionality falls under the term "AGC" (automatic gain control) now also use this measurement method. Well-known manufacturers of such devices are, for example, Jünger Audio (Level Magic), TC Electronic (DB4 / DB 8) and Dolby (LM 100).

Due to the committed manufacturer support, the measurement method "ITU Rec. BS.1770 / BS.1771" could in the future achieve the status of an "internationally recognized measurement method for volume".

The EBU guideline R 128 is a technical set of rules that redefines the sound control of radio and television programs. It will be used by public and private television broadcasters in Germany from August 31, 2012.

See also

Web links

  1. ↑ The EBU guideline R 128 in German (PDF file; 392 kB)