Sound Source Localization in Closed Test Stands

The patent converts the harmful effect of sound reflections on boundary surfaces into a beneficial measurement tool. By arranging microphones along the edge where two flat boundary surfaces meet, the reflection patterns become predictable and mathematically correctable. The interference patterns created by reflections are used to identify and eliminate reflected signal components, thereby improving sound source localization precision without requiring expensive anechoic chambers.

The patent performs preliminary actions by pre-calculating and storing transfer functions that represent the reflection characteristics of the measurement room before actual measurements are taken. These pre-computed transfer functions are then applied during measurement processing, avoiding the need for complex real-time calculations. This approach maintains high measurement precision while significantly reducing the time required for data processing and analysis.

The patent creates a virtual model of the measurement room's acoustic characteristics through transfer function measurements and calculations. This virtual copy of the room's reflection behavior allows for mathematical correction of reflected signals without requiring physical anechoic treatment. The approach replicates the benefits of an anechoic environment through computational means, avoiding the high costs and manufacturing complexity of building actual anechoic chambers.

The patent replaces the mechanical/physical approach of using sound-absorbing materials with a mathematical signal processing approach. Instead of physically absorbing reflected sound waves with materials, the system uses transfer function-based calculations to identify and subtract reflected signal components from the measured data. This substitution eliminates the need for extensive sound-absorbing materials while achieving the same goal of improving measurement precision.