JPH03257331A - Apparatus for detecting acoustic signal - Google Patents

Abstract

PURPOSE:To accurately obtain the azimuth of a sound source by arranging acoustic signal detection sensors on the origin, an X-axis, a Y-axis and a Z-axis and using an acoustic intensity measuring method. CONSTITUTION:The signals from the acoustic signal detection sensor 1 arranged to the origin and the acoustic signal detection sensors 2, 3, 4 arranged on an X-axis, a Y-axis and a Z-axis are inputted to signal processors 5, 6, 7 by pairs and the acoustic intensity vector components of the respective axes are calculated and synthesized by a vector synthesizer 8 and the azimuth of a sound source and the energy intensity thereof are obtained. That is, since the azimuth of the sound source is detected by an acoustic intensity measuring method, even when the distances between the acoustic signal detection sensors are made short, the azimuth of the sound source can be accurately obtained and, at the same time, energy intensity can be also detected.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an acoustic signal detection device.

2. Description of the Related Art Conventionally, there is a device shown in FIG. 5 for detecting the direction of a source of an acoustic signal. This detection device has three acoustic detection sensors 11 arranged in the same plane, and for example, an acoustic signal a arriving from a sound source to two acoustic detection sensors 11 is detected between the two acoustic detection sensors 11. The direction of the sound source was detected based on the time difference or phase difference based on the distance.

Problems to be Solved by the Invention According to the conventional detection device described above, if it is desired to improve the detection accuracy, it becomes necessary to increase the distance between the acoustic detection sensor and the ground (for example, 1 m or more), which increases the size of the device itself and However, there is a problem in that the frequency of the acoustic signal that can be detected is limited. Furthermore, conventional detection devices cannot measure the energy intensity of the sound source.

Therefore, an object of the present invention is to provide an acoustic signal detection device that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the acoustic signal detection device of the present invention arranges acoustic signal detection sensors at the origin and at predetermined positions on the X-axis, y-axis, and Z-axis. A signal processor is provided which calculates the sound intensity vector components on each axis by inputting the signals obtained from the origin and the x-axis at each village on the origin and the y-axis, and on the origin and the x-axis,
A vector synthesizer is provided for synthesizing each acoustic intensity vector component obtained by this signal processor.

Effects According to the above configuration, signals from the acoustic sensor placed at the origin and the acoustic detection sensors placed on each of the X-axis, y-axis, and X-axis are input to the signal processor in pairs, and The sound intensity vector components of are calculated. These acoustic intensity vector components are then synthesized by a vector synthesizer to obtain the direction of the sound source and its energy intensity.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 to 4.

Figure 1 shows the arrangement of the acoustic signal detection sensor;
The figure is a block diagram showing a schematic configuration of an acoustic signal detection device.

That is, the acoustic signal detection device according to this embodiment detects four acoustic signals arranged at predetermined positions on the origin, the X axis, the y axis, and the X axis (preferably equidistant from the origin, but different distances may be used). Detection sensors (hereinafter simply referred to as detection sensors; for example, a hydrophon is used) 1 to 4 and signals P1 to P4 from each of these detection sensors 1 to 4 are detected in pairs, that is, on the origin and the X axis. Each signal P□, P2 obtained from sensors 1 and 2, the detection sensor l on the origin and the y-axis.

3, each signal p, , p3 obtained from the origin and the detection sensors 1, 4 on the X axis, each signal P1 . Signal processors 5, 6.7 input P4 and calculate the acoustic intensity vector components in each axis, and the acoustic intensity vector components obtained by these signal processors 5, 6.7 are three-dimensionally processed. and a vector synthesizer 8 for synthesizing the vectors.

In the above structure, the sound pressure of the acoustic signal from the sound source is detected by each of the detection sensors 1 to 4.

These sound pressures are input as signals P1 to P4 in pairs to each of the signal processors 5 to 7 as described above, and the sound intensity vector components of each axis are calculated.

Here, a method for determining the acoustic intensity beta will be explained.

The sound intensity vector E is the product of the instantaneous sound pressure P and the instantaneous particle velocity U, averaged over time T.

4 Ur: Particle velocity in the r direction The sound pressure of the two detection sensors A and B is approximated by a finite difference using equation (3).

By the way, direct measurement of particle velocity is difficult, so it can be approximated from two detection sensors. demand. In other words, there is a relationship.

In the r direction, the sound pressure is: Therefore, the signal processors 5 to 7 are circuits that execute the above equation (8), resulting in a processing circuit as shown in FIG. .

Then, the acoustic intensity vector components of each axis obtained by the signal processors 5 to 7 are input to the vector synthesizer 8 and synthesized.

An example of this vector composition is shown in FIG.

That is, the polarization angle (0°φ) of the synthesized vector ■ indicates the direction of the sound source, and the absolute value II of the vector ■
+ indicates the energy intensity of the sound source.

In this way, since the detection sensors are arranged three-dimensionally and the acoustic intensity measurement method is used, the direction of the sound source can be measured with a narrower sensor interval than in the past, and the energy intensity can also be measured.

In addition, when using conventional phase difference, there is a correlation between the sensor interval and the detected frequency component, so it was necessary to change the sensor interval for each frequency band, but with this device,
There's no need for that. That is, by performing the processing in the signal processor over a wide band, it is possible to simultaneously detect the orientation and energy intensity of different frequency components.

Note that the above acoustic detection device can be used in the air or underwater.

Effects of the Invention As described above, according to the configuration of the present invention, the acoustic detection sensors are arranged at the origin and on the X, Y, and Z axes to detect the direction of the sound source by the acoustic intensity measurement method.
Even if the distance between the acoustic detection sensor and the ground is narrowed, the direction of the sound source can be obtained with high accuracy, and the energy intensity can also be detected at the same time.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which the upper figure is a perspective view showing the arrangement of the acoustic detection sensor, FIG. 2 is a block diagram showing the schematic configuration of the acoustic detection device, and FIG. FIG. 3 is a block diagram showing a processing circuit in the sound intensity method, FIG. 4 is a vector composition diagram in the same intensity method, and FIG. 5 is a perspective view showing the arrangement of sound detection sensors in a conventional example. 7- 1-4...Acoustic signal detection sensor, 5-7...Signal processor, 8...Vector synthesizer.

Claims (1)

[Claims] 1. Place acoustic signal detection sensors at predetermined positions on the origin and the x-axis, y-axis, and z-axis, and detect the signals obtained by these detection sensors on the origin and the x-axis, between the origin and the y-axis, and between the origin and the A signal processor is provided for inputting each pair on the z-axis to calculate a sound intensity vector component in each axis,
An acoustic signal detection device comprising a vector synthesizer for synthesizing each acoustic intensity vector component obtained by the signal processor.