Acoustic level measurement in room or vehicle uses ultrasound system for precise location of microphone, enabling acoustic levels to be plotted

摘要

The measuring equipment includes several microphones (5) and an ultrasound source (12) mounted at a known distance from the microphone(s). An ultrasound receiving base (14) in the vicinity detects the ultrasound signals and determines the position of the transmitters. By this means the position of the microphone is also detected, so that the precise location of the sound measurement is determined. The installation for measuring acoustic signals includes a measurement antenna (4) which is fitted with one or several microphones (5). A system (11) for positioning this antenna is provided, and comprises at least one ultrasound source (12) mounted on the antenna at a known distance from the microphone(s). An ultrasound receiving base (14) in the vicinity detects the ultrasound signals from each ultrasound transmitter and determines the position of the transmitters. A control system (16) adjusts the position of the antenna, such that in a first phase successive use of ultrasound signals enables the position of the antenna to be determined, and in a second phase a measurement of the acoustic signal level is made using the microphones.