As demonstrated by Dr. Wolfgang Klippel in his free Klippel Live webinar series “Acoustical Measurement of Sound System Equipment according to IEC 60268-21”, multi-tone based testing plays a key role in the critical evaluation of SPLmax, compression and other important parameters of today’s audio products.
In order to provide dedicated tools for standard-compliant audio testing, Klippel released two new software modules: Multi-tone Measurement (MTON) for lab applications and QC Multi-tone Distortion (MTD) for efficient end-of-line testing.
The Multi-Tone Measurement (MTON) is a versatile tool for the R&D engineer that helps finding the operation limits of any audio product related to mechanical and thermal compression as well as multi-tone distortion headroom. Iterative, stepped measurements protected by clear thresholds automatically pinpoint the SPLmax according to IEC 60268-21 as well as continuous max SPL (ANSI/CEA-2010-B & 2034). The well-defined multi-tone stimulus can be exported to a WAV file, and it provides standard and custom spectral weighting functions to match the characteristics of the target program material for meaningful specs that meet the requirements of your product’s target application.
In addition, the new Multi-Tone Distortion Task (MTD) is an add-on for our QC software framework that can be inserted as a test step (task) in any existing QC test. It ensures overall consistency of production electrically and acoustically.
Both modules (MTON and MTD) cover multi-tone stimulus, "fingerprint“ testing of speakers and audio systems (acoustically and electrically), and stimulating harmonics and intermodulation distortion. All of these features come with a batch of new test templates using the new MTON and other long-established measurement modules such as Transfer Function Measurement (TRF), 3D Distortion Measurement (DIS) and Near Field Scanning System (NFS) that focus on taking advantage of the new IEC standard and helping users perform hassle-free compliant measurements.
The update is rounded off with a complete revision of the Suspension Part Measurement (SPM) and many smaller feature updates and minor bug fixes for tools like Rocking Mode Analysis (RMA) and Live Audio Analyzer (LAA). A full overview of the new update can be found on the Klippel website as well as in the information sheet "What’s new in dB-Lab 210 – QC 6.6."
The informative webinar series Acoustical Measurement of Sound System Equipment according to IEC 60268-21 is still available on demand and is highly recommended for any professional working with DSP, audio systems or loudspeakers. The next session Pitfalls in Testing Wireless Audio Devices is on July 22nd 2020 at 5pm (CEST). Wolfgang Klippel will talk about issues that arise when testing wireless audio devices, their effects and how to overcome them for accurate measurements. On a related note, Klippel has also released a detailed product overview document for IEC Standard 60268-21 measurements.