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APM
April 4, 2020
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Audison_APM

The development of Audison APM is the result of years of research and development into a complex topic, the evaluation of in-car sound quality. Many people in the industry have been talking about measuring acoustic performance without ever having achieved a tangible result up to now.

The bit Tune hardware platform implements APM functionalities providing the market as well as industry specialists with a complete tool, enabling two innovative types of analysis which objectively evaluate customized and OEM car audio systems.

bit Tune Splash screen with APM tool

bit Tune Splash screen with APM tool

Thanks to the capabilities of APM, sound quality evaluation is no longer influenced by the preferred music genre of the listener. The APM technology is able to replicate the auditory perception of humans and therefore to measure the system performance with a high level of precision.

bit Tune + dummy head (optional)

bit Tune + dummy head (optional)

APM measurements

The APM software is composed by two measurement tools: the FSA (Front Stage Analysis) and TMD (Total Music Distortion).

The asymmetric listening position affects the quality of in-car sound reproduction. Placing the front soundstage at the center of a car hi-fi system is the most critical and challenging element. For this reason, we have developed the FSA, a dedicated analysis tool for the automatic localization of the virtual sound image generated by a stereophonic configuration.

This technology has been made possible thanks to the dummy head, which allows the recreation of a HRTF (Head Related Transfer Function) and a new approach, based on binaural and monaural cue which was studied to simulate the human auditory perception of the sound image.

Thanks to the FSA, the front sound emission can be analysed as if your dashboard was the soundstage of a concert and this allows one to determine, with high level of accuracy, the centre stage on the two axis, providing the FSA score as result.

FSA (Front Stage Analysis)

FSA (Front Stage Analysis)

TMD (Total Music Distortion) is a tool that can measure the linear and non-linear distortions of the system’s frequency response using a real musical track unlike conventional methods of measurement.

This analysis can be performed at different sound pressure levels, which is very significant for the system’s performance identification when we push the system close to or over its distortion point, providing different TMD scores for different SPL categories.

APM main software window

APM main software window

Owner’s manual_APM_rev_1

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