ABSTRACT
Loudness Metering CHAPTER OUTLINE Dorrough Loudness Meter.....................................................................................................96 Dolby Meters...............................................................................................................................96
TC Electronic LM5/LM5D......................................................................................................99 EBU R 128 Loudness Metering ........................................................................................102
Bibliography...............................................................................................................................105
Loudness is defined as the subjectively assessed level of sound. The task of an
instrument named a loudness meter is more or less to emulate human hearing.
The problem, however, is that the hearing and the assessment of sound to some
degree is individual from person to person. Hence a true loudness meter is very
difficult to define. Level, dynamic range, frequency range, the direction of
received sound, and the character of the sound itself will have an effect on
the perceived loudness. Further it is not possible to express the loudness of
an electrical signal; it is the acoustic sound received and perceived by the
listener that should be the basis for the measurement or calculation of loudness.
So in reality the truth is impossible to reach. It is rather a question of defining
a system that exhibits minimum error, a system that is satisfactory to most
listeners.
