Impulse response measurement system and its recent applications

Our impulse response measurement system has been developed for ten years. During this decade, the environment related to this measurement has changed significantly. In this article, the features and notes on the measurement system using the sound card, and our brand new system, which is expanded for multichannel inputs, will be presented. Finally, a new technique, which combines multichannel impulse response measurement and signal processing with microphone array, will be presented. The microphone array was designed for noise analysis for automobile interiors. The array consists of 31 microphones on the surface of an acoustically hard sphere. Moreover, 12 cameras are arranged on the surface of the sphere to take photos. Some applications and future development will be presented.