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.

  • Full implementations of the latest loudness standards and recommendations
  • Bargraphs for summed Loudness with Momentary, Shortterm, Integrated values, and Loudness Range (LRA)
  • Numerical display of all relevant values like M, S, I, LRA, TPmax, Mmax, Smax, Itime

Loudness Sum

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.

Technical Specifications >          Interactive Demo >

Loudness Num

With the Loudness Num instrument you can monitor some or all relevant values of a loudness measurement on a numerical display: M, S, I, LRA, TPmax, Mmax, Smax, Itime.

Technical Specifications >          Interactive Demo >

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.

Technical Specifications >          Interactive Demo >


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).

Interactive Demo >

Practical Use

  • Control your program according to the requirements resp. the delivery standards and be loudness compliant
  • Keep your eyes on the summed, maximum, and true peak values
  • Monitor indivdual program parts, complete programs, or the whole broadcast
  • Evaluate the dynamic of your program in regard to the distribution path
  • Identify, if the program needs or has seen processing
  • Get information for normalizing dialog loudness level in film sound mixing


  • TouchMonitor TM7, TMR7 or TM9
  • Optional on TM7 or TM9 software license SW20001: Multichannel Mode for the display of more than 4 channels and Dialnorm


How do I order licenses? Order item: SW20002



€ 660.00 | $ 759.00
(Net price plus currently applicable VAT)