What's New in dB-Lab 212.616 - QC 7.5
New: Minor dB-Lab Update
A new minor software update for the KLIPPEL Analyzer System is now available, featuring significant revisions to the KLIPPEL Endurance Test (KET) as well as extended analysis opportunities for R&D modules like Multi-Tone Measurement (MTON) and Time Frequency Analysis (TFA). The update is free of charge for all users running dB-Lab 212 or QC7. For more information of the minor update, see our updated version of the What's New briefing sheet - Click here for the English Version or 中文版本.
KLIPPEL Endurance Test (KET)
KET has now the ability to calibrate the individual channels of Mezzo power amplifiers to increase the accuracy of voltage reading and voltage at the amplifier output. A fast, semi-automatic procedure guides the user through the voltage reading calibration. It is now an integral part of the hardware setup. External measurement equipment is not required. A short video shows the full hardware setup (calibration starts at 1:50).
Multi-Tone Measurement (MTON)
The MTON module extended its analysis of statistical signal distribution. Probability density analysis is available not only for the stimulus but also for related states with similar wideband content, like sound pressure, voltage and current. These can be compared side by side with diaphragm displacement, which potentially shows a quite different probability density distribution (due to low pass filtered characteristic with a cut-off at fundamental resonance). Of special interest for a speaker designer is the dynamically generated offset. The shown example it moves the coil inwards by 20 % of the peak excursion (note the normalized x-axis) and may cause instabilities or defects.
Time Frequency Analysis (TFA)
The TFA received updates both concerning its user interface – now featuring synchronized cursors for time and frequency range selection – as well as additions to reverberation time analysis. The latter is now available per frequency band, fully compliant with IEC 60268-23 and features a new, convenient way to check the validity of results in each band. Green bars indicate valid data with sufficient signal-noise ratio to derive reverberation time, as shown in the example below. TFA automatically checks for noise corruption and insufficient impulse response length and shows appropriate warnings and errors. The global reverberation time is marked as a dashed line. Important applications for frequency-dependent reverberation time are the analysis and design of listening rooms as well as the calculation of the room transfer function or room gain defined in IEC 60268-23.