The LMS Qsources Binaural Source-Receiver

The investigation of the noise contributions of vehicle interior targets has become a standard procedure for vehicle manufacturers. This allows insight in noise contributions, interface forces and system sensitivities. 


The latest extension of this technology is the analysis based on a binaural recording of operational sounds. But this also requires binaural transfer function measurements.

In order to fulfill these requirements, LMS developed a human head-torso simulator with integrated microphones and integrated volume acceleration sound sources.

This device thus not only functions as a binaural head, one can also measure transfer functions reciprocally. One can simply use this device during operational recording as well when measuring FRFs without moving the Head-torso. Hence, no error will be made anymore because of re-positioning.

For using the head-torso simulator in source mode two mid-high frequency sources are located at each ear position, whereas one low-frequent source, located in the mouth, covers the frequency range below 300Hz. To have access to the actual in-situ source levels, all used drivers are designed with integrated volume acceleration sensors. For using the device in receiver mode, 2 microphones are located at the entrance of each ear channel.

Typical applications are thus: binaural recording of sounds, binaural FRF measurements used for both Sound Quality as for Binaural Transfer Path Analysis.

Amplifiers such as the LMS Qsources Amplifier or similar can be used for excitation of the sources. The microphones do not need any external power supply and can be directly connected to any high input impedance signal acquisition instrument such as the LMS SCADAS III frontend.