Loudness and SPL Display
Loudness Analysis and Handling with Easy to Read Instruments: Loudness and SPL Display
Graphical and numerical instruments for loudness measurements according to current standards
The Loudness and SPL Display license expands the basic 4-channel PPM with graphical and numerical instruments for Loudness measurements as described in current guidelines (EBU R128, ITU-R BS.1770-4/1771-1, ATSC A/85, ARIB, OP-59, AGCOM, CALM, LEQ(M), TASA, SAWA), and the LRA instrument for the graphical display of the Loudness Range. A customer-specific mode allows the user to modify parameters.
In addition, the license provides the SPL display mode with various weighting filters and integration times as well as reference level adjust to calculate an SPL value from an electrical signal. Dialnorm values can be meausred with activated Multichannel Mode license (SW20001).
If you additionally activate the Timecode Reader license (SW20008), you are able to execute timecode-based loudness measurements and loudness recalculation.
With the Loudness Sum instrument you get a bargraph display of the summed Loudness values M, S, and/or I of a Loudness measurement acc. to EBU R128, ITU BS.1770-4/1771-1, ARIB, ATSC A/85, OP-59, AGCOM, CALM Act, LEQ(M), TASA, SAWA, or specified by customer. A SPL meter is also included.
LRA (Loudness Range)
The LRA (Loudness Range) instrument displays a graphical representation of the loudness variances within short time periods. These are measured against the Loudness Range (LRA) descriptor specified in EBU R 128. It is used to show whether a program has a continuously constant loudness or a high variation between low and high level components. It allows for making assumptions on whether the program has seen or requires dynamic processing with regard to the intended distribution path.
The Dialnorm instrument can calculate and show Dialnorm values from its digital input signals. Dialnorm is used in film sound mixing and describes the normalization of the dialog loudness level (dialogue normalisation) with respect to a certain reference monitoring level (–31 dBFS in surround applications).