LQL – Loudness Quality Logger

LQL version 1.6 available from the download area. Read more >

Logging console for collecting Loudness and TruePeak data of various TM7, TMR7, and TM9 units of the TouchMonitor series

The RTW TouchMonitor range is a high class series of audio monitoring devices used for various broadcasting applications. Part of the functionality of these products is to measure the loudness of incoming audio data. The result of the measurements is visualized for a lot of applications in realtime, but there is also a requirement of logging data over time.

With the LQL - Loudness Quality Logger RTW offers a logging console that collects data from various TouchMonitor devices directly via IP connection or external USB storage devices in order to provide an offline storage capability that goes along with some add on features.

The first version of the Loudness Quality Logger is a program for Windows® OS based PC’s. It provides logging of timecode or realtime based loudness and TruePeak data from TouchMonitor TM7, TMR7, and TM9 series with Loudness licence and Logging Data Server licence option SW20014 activated. The Logging instrument available with the licence has to run in IP mode. A maximum of two audiogroups per unit can be set to provide data to be collected by the LQL. Main and secondary limits may be applied and can be used to generate various alarms to indicate and to log the exceeding of limits set by legal or in-house regulations for example. All status information of the device is stored with the logged data.

For TM7, TMR7, or TM9 users, the LQL – Loudness Quality Logger PC software is available free of charge at our download area. For connecting data via network, each TouchMonitor requires a Logging Data Server licence SW20014 to be activated.


  • Logging console for Windows® OS based PC's
  • Timecode or realtime based collection of Loudness and TruePeak data of various TM7, TMR7, or TM9 units
  • A maximum of two audio groups with Logging instrument on each device can be connected (precondition: licence SW20014 is activated)
  • Data collection via IP connection or from external USB memory devices
  • Status overview of connected units and audio groups (main window)
  • Graphical view of logged data over time of an audio group with up to four permanently captured parameters (detail window)
  • Different scaling factors for the display of different spans of time
  • Two-stage definition of limits to signal violations
  • Markers for sequential analysis
  • Numerical view of all measured parameters

System Requirements

  • PC with Dual-Core processor, min. 2.5 GHz
  • Microsoft® Windows® 7 with SP1 or Windows® 8, (32/64 bit)
  • C++ Runtime Libraries (Download from Microsoft)
  • Min. 2 GB RAM, 4 GB RAM recommended
  • Min. 50 MB hard disc storage left
  • Additional disc space recommended for storing logging data and backups
    (amount depends on number of connected audio groups)
  • Network connection
  • TouchMonitor with Logging instrument activated and connected to the network


Mainly the LQL – Loudness Quality Logger software consist of a kernel collecting and storing data in the background. A user interface is provided to connect and monitor the devices and for display of aquired data. The user interface itself consists of a main window giving an overview and additionally selectable detail windows.
The examples shows the main window in the background, covered from two detail windows with differently selected parameters respectively belonging to one audio group. The rear detail window is freezed, the front one is permanetly drawing values over time (LIVE).

The main window gives an overview about the connected audio devices and their audio groups being enabled to deliver Loudness and TruePeak data. In addition, quality of service for the connection and data is indicated by the colors of the traffic lights. TouchMonitor devices as well as their audio groups need to have biunique names to be able to communicate with LQL. Using the Add dialog, the LQL will access the device with its IP address and indicate it by its name.

Data being collected in the background will be calculated and displayed in the detail window as a graph according to the selected values and scaling factor. Up to four values can be displayed in any combination at a time with enabled (Live) or disabled (Freeze) continuously updating graph. In the numerical display section all values are permanently visible. The displayed time stamp on the time line (below the graph) depends on the time settings of the selected TouchMonitor and is also continuously updating. Start and End time of data capture is displayed below the numerical section. A rough estimated point of time can be refined using one of the scaling factors or be jumped to by using the GO TO TIME function. The MARKS ON function allows to place markers in the graph selecting a section that will get a numerical recalculation.

In the menu settings of the LQL, the Main Alarm Threshold Set menu is used to set main limits according to legal regulations or the requirements of current loudness standards for example.
The Secondary Alarm Threshold Set menu is used to set additional thresholds according to in-house regulations for example. They should be set to a tighter value than the corresponding main limits to
assure the possibility of potential corrections of the actual program material. If secondary limits are indicated as exceeded, the engineer can regulate the program early enough to keep it in balance to the
main limits allowed.
The alarm thresholds set in LQL represent individual helpful marks, but they don't perform any modifications to the actual audio streams.


Manuals & Software

Downloads for Manuals & Software of current models or for PC software,
but also for older versions, can be found in our download area.