Sound source identifying and measuring apparatus, system and method

Abstract

A sound source can be identified and measured for a long term outdoors and indoors. A sound source identifying and measuring apparatus including a baffle equipped with a frame and a weather-resistant screen for providing pneumatic clearance for long-term indoor and outdoor measurement at a sound source measurement point is used to acquire sound source information in all directions and associates azimuth angles, elevation angles, sound pressure information and / or frequency characteristics or the like per elapsed time. A directional digital filter as well as identification parameters such as a target sound source and a sound source other than the target are used to identify the sound source more accurately for identification and measurement of the target sound source.Contribution of all of a plurality of sound sources to a sound pressure is separated per coming direction for analysis. Whether or not the sound source is a target sound is determined, and determination such as estimation of its sound source intensity and sound pressure level is made.

Description

technical field [0001] The invention relates to a sound source identification and measurement device, system and method for identifying and measuring the sound pressure and sound pressure level of target sound sources from all directions. Background technique [0002] In the past, as the device for identifying the target sound source, for example, there are the following two types: the measurement device using the radio wave receiving method. When the target sound source is aircraft noise, the receiving transponder responds to the signal radio wave and the radio altimeter signal radio wave. Electric field strength level correlation judges and identifies whether the object noise is aircraft sound (patent documents 1, 2); utilizes the measurement device of the noise correlation mode, detects and identifies the incoming direction of the noise according to the correlation detection of the received signals of 2 or 4 microphones ( Patent Document 3). When these sound recognition ...

AI Technical Summary

Problems solved by technology

[0009] However, in the devices described in existing documents, where the difference (S / N ratio) between the target sound source and the target sound source is small, since the correct position and direction of the target sound source cannot be grasped, the sound source recognition judgment very difficult

For example, when the target sound source is the sound of an aircraft, if the device is installed on the ground to measure, the sound pressure level of the sound source outside the target such as vehicle sound and wind noise is equal to or higher than the sound pressure level of the target sound source, subject to these Due to the influence of noise, it is often impossible to grasp the correct value of the target sound source, resulting in mismeasurement.

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