JPH07104049A - Sound source direction indicating device - Google Patents

Abstract

PURPOSE:To easily specify the direction of a sound source of noise. CONSTITUTION:The energy intensity of a sound wave is measured by the vector quantity by use of two microphones 13A, 13B combined with each other in the orthogonal intersecting direction, the output is frequency-analyzed by a frequency analyzing part 14A, 14B, and further only a sound wave of a specified frequency is passed by a band-pass filter 15 to be input to a sound source direction arithmetic part 16. In the sound source direction arithmetic part 16, the vector quantities of a specified frequency measured by two microphones 13A, 13B are synthesized to specify the sound source direction, and a sound source direction display part 12 vector-displays the sound source direction. Accordingly, the sound source direction of a sound wave of a specified frequency can be easily known from the display of the sound source direction display part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound source direction indicating device for specifying and displaying a sound source direction.

[0002]

2. Description of the Related Art In the environment where people live, a lot of unpleasant noise is present, which causes great stress.
Therefore, conventionally, a noise value is measured and displayed by a sound level meter, and a frequency analysis of the noise is performed and displayed.

[0003]

However, in the past, even if the intensity of noise is measured and displayed as described above, or the frequency of noise is analyzed and displayed, it is actually There is a problem in that the position and direction of the sound source having a frequency that is particularly uncomfortable cannot be specified, and the noise source cannot be easily cut off.

In particular, an electric car or the like is equipped with a large number of electric devices having a large current capacity, and these devices generate noise that makes passengers uncomfortable. However, a large number of electric devices are concentrated in the lower part of the vehicle body. However, since it is dangerous to look into the back of the vehicle, it is difficult to identify from which device the noise that makes passengers feel uncomfortable.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a sound source direction indicating device capable of easily specifying the direction of a sound source of a sound wave of a specific frequency.

[0006]

The sound source direction indicating device according to the invention of claim 1 is assembled in directions orthogonal to each other,
Two movable microphones for measuring the energy intensity of sound waves by a vector quantity, a frequency analysis section for frequency-analyzing the output of each microphone, and a band-pass filter for passing a specific frequency among the frequencies analyzed by each frequency analysis section. , A sound source direction display unit for vector-displaying the intensities of sound waves of specific frequencies passed by the band-pass filters on two orthogonal axes.

The sound source direction indicating device according to the invention of claim 2 is combined with each other in directions orthogonal to each other, and two microphones for measuring the energy intensity of a sound wave by a vector quantity and a frequency analysis section for frequency-analyzing the output of each microphone. When,
Of the frequencies analyzed by each of the frequency analysis units, a bandpass filter that passes a specific frequency, a sound source direction calculation unit that identifies the direction of the sound source from the intensity of the sound waves of the specific frequency that each bandpass filter has passed, and the sound source direction And a sound source direction display unit for displaying the sound source direction specified by the arithmetic unit.

[0008]

In the sound source direction indicating device according to the first aspect of the invention, the energy intensity of the sound wave from the sound source is measured as a vector quantity by the two microphones combined in the directions orthogonal to each other, and the output of each microphone is output by the frequency analysis unit. Is further frequency-analyzed, and a sound wave of a specific frequency to be measured is passed through the band pass filter, and the intensity of the sound wave of the specific frequency passed through the band pass filter is vector-displayed on the orthogonal two axes by the sound source direction display unit.

Therefore, by using this sound source direction indicating device, two microphones combined in the orthogonal direction are rotated, and the vector amount of the sound wave of a specific frequency picked up by one microphone is maximized, and conversely, the other microphone. It is possible to find the direction of the sound wave that minimizes the vector amount of the sound wave of the specific frequency, and specify the direction in which the maximum vector amount is obtained as the sound source direction.

According to the sound source direction indicator of the invention of claim 2,
The energy intensity of the sound wave is measured by a vector quantity by two microphones that are combined in the orthogonal direction, the output is frequency-analyzed by the frequency analysis unit, and only the sound wave of the specific frequency is passed by the band pass filter, and this is the sound source. Input to the direction calculator.

The sound source direction calculation unit specifies the sound source direction by synthesizing the vector amount of the specific frequency measured by each of the two microphones, and the sound source direction display unit displays the sound source direction as a vector.

Therefore, by using this sound source direction indicating device, it becomes possible to easily know the sound source direction of the sound wave of the specific frequency from the display of the sound source direction display section.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a machine configuration diagram of an embodiment of the invention of claim 1, and FIG. 2 is a circuit block diagram thereof. First, the mechanical structure will be described. As shown in FIG. 1, a sound source direction indicator 2 is attached to a main body 1 so as to be horizontally rotatable, and is oriented in two directions orthogonal to each other so as to rotate together with the sound source direction indicator 2. Microphones 3A and 3B are attached.

The sound source direction indicator 2 is a vector display 2 for displaying a vector amount according to the sound source intensity in the directions of two orthogonal axes.
It is equipped with A and 2B. Each of the microphones 3A and 3B is a so-called intensity microphone that measures the energy intensity of a sound wave by a vector amount.

On the main body 1, a power switch 1A, for example, 1000 Hz or less, 1000 to 3000 Hz band,
The frequency band selection switch 1B for 3000-10000 Hz band, 10000 Hz or higher is provided.

Next, the circuit configuration will be described. The measurement signals are received from the respective microphones 3A and 3B that are rotatably attached in combination so as to be oriented in two directions orthogonal to each other, and sound waves are output for each predetermined frequency band. Frequency analysis units 4A and 4B for obtaining vector quantity of energy intensity
With respect to the vector amount for each frequency band obtained by each of these frequency analysis units 4A and 4B, a band pass filter 5 that passes the vector amount of the sound wave only in a specific frequency band specified by the operator, and two orthogonal axes. On each of them, there is provided a sound source direction indicator 2 for displaying the vector amount of the specific frequency band passed by the band pass filter 5 with a length proportional to the magnitude of the vector amount.

Next, the operation of the sound source direction designating device having the above construction will be described. This sound source direction indicator is installed at the place where the sound source direction is desired to be specified, the power switch 1A is turned on, and the frequency band to be measured is set to the frequency band selection switch 1
Select and set by B. Normally, noise such as "keen" that people feel uncomfortable is frequency of 1000 Hz to 20 Hz.
Since the frequency band is 00 Hz, the frequency band selection switch 1B will be used to select the frequency 1000 to
A case where the 3000 Hz band is selected will be described.

When the power is turned on, the microphones 3A and 3B in the two directions orthogonal to each other each measure the energy intensity of the brazing sound wave as a vector quantity, and the frequency analysis unit 4
Output to A and 4B. The frequency analyzers 4A and 4B divide the sound waves picked up by the microphones 3A and 3B into frequency bands, measure the vector amount for each frequency band, and output the vector amount to the band pass filter 5.

In the band pass filter 5, since the frequency band selection switch 1B selects the band of 1000 to 3000 Hz, the selected frequency band 1000 to 300 is selected for the input from each of the frequency analysis units 4A and 4B.
Sound source direction indicator 2 by passing only 0 Hz vector quantity
Output to. Then, in the sound source direction indicator 2, the vector display portions 2A and 2B on the two axes orthogonal to each other are lit for a length corresponding to the input vector amount, and the display such as a color change is performed, and the two directions orthogonal to each other are displayed. Each of the microphones 3A and 3B displays the vector amount of the energy intensity of the brazing sound wave.

Therefore, when an operator rotates the sound source direction indicator 2 by hand, the two microphones 3A and 3B orthogonal to each other also rotate, and the energy intensity of the sound wave from the wound sound source also changes. And sound source direction indicator 2
Since the vector lengths displayed by the vector display portions 2A and 2B in the two-axis direction of 1 change, the vector length of the energy intensity of the sound wave of one microphone 3A becomes maximum,
On the contrary, if the other microphone 3B finds the direction in which the vector length of the energy intensity of the brazing sound wave is the minimum, the direction in which the found energy intensity of the sound wave is the maximum is the sound source direction.

As described above, in the sound source direction indicator of this embodiment, one of the two orthogonal microphones 3A and 3B rotating together with the sound source direction indicator 2 displays the maximum vector amount, and the other displays the minimum vector amount. By finding the direction in which is displayed by rotating the microphones 3A and 3B, it can be determined that the sound source exists in the direction in which the maximum vector amount is displayed.

The invention of claim 1 is not limited to the above-mentioned embodiment, and in particular, regarding the mechanical structure, it is a structure in which only the microphones 3A and 3B in two directions orthogonal to each other can be held by hand. The display 2 side may be fixed to the main body 1. In the case of such a structure, while holding the microphones 3A and 3B by hand and slowly rotating them, the display of each of the vector display portions 2A and 2B of the sound source direction indicator 2 is checked to see one of the vector display portions 2A.
Alternatively, if the vector amount of 2B is maximum and the vector amount of the other vector display portion 2B or 2A is minimum, the direction of the microphone measuring the maximum vector amount at that time can be determined as the sound source direction. .

In the above embodiment, the way of dividing the frequency band of the sound source is not particularly limited.

Next, an embodiment of the invention of claim 2 will be described with reference to the drawings. FIG. 3 shows the mechanical construction of an embodiment of the invention of claim 2, and FIG. 4 is a circuit block diagram thereof. First, the mechanical structure will be described. As shown in FIG. 3, the sound source direction indicator 12 is attached to the main body 11, and the microphones 13A and 13B are attached together with the sound source direction indicator 12 in two directions orthogonal to each other. ing.

The sound source direction indicator 12 is provided with a vector display section 12A for displaying a vector amount according to the sound source intensity in an arbitrary direction in the orthogonal biaxial coordinates. Further, each of the microphones 13A and 13B is a so-called intensity microphone that measures the energy intensity of a sound wave by a vector amount.

On the main body 1, a power switch 11A,
For example, a frequency band selection switch 11B for 1000 Hz or lower, 1000 to 3000 Hz band, 3000 to 10000 Hz band, 10000 Hz or higher is provided.

Next, the circuit configuration will be described. The measurement signals from the microphones 13A and 13B, which are mounted in combination so as to face in two directions orthogonal to each other, are received, and the energy intensity of the sound wave is determined for each predetermined frequency band. Frequency analysis units 14A and 14B for obtaining vector quantities,
Regarding the vector amount for each frequency band obtained by each of these frequency analysis units 14A and 14B, the band pass filter 15 that passes the vector amount of the sound wave only in the specific frequency band specified by the operator, and the band pass filter 15 A sound source direction calculation unit 16 that receives an output and specifies a sound source direction of a sound wave in a specific frequency band by a vector synthesis calculation, and a vector display of a length corresponding to the sound source intensity in the sound source direction calculated by the sound source direction calculation unit 16 A sound source direction indicator 12 is provided on the display unit 12A.

Next, the operation of the sound source direction designating device having the above construction will be described. This sound source direction indicator is installed at the place where the sound source direction is desired to be specified, the power switch 11A is turned on, and the frequency band to be measured is selected by the frequency band selection switch 1
Select and set by 1B. Normally, noise such as "Kean" that people feel uncomfortable has a frequency of 1000 Hz-
Since the frequency band is 2000 Hz, the frequency band selection switch 1B is used to set the frequency 100 including this frequency band.
A case where the 0 to 3000 Hz band is selected will be described.

When the power is turned on, the microphones 13A and 13B in the two directions orthogonal to each other respectively measure the energy intensity of the brazing sound wave as a vector quantity and output it to the frequency analysis sections 14A and 14B. Frequency analysis units 14A, 14
In each B, the sound quantity picked up by each of the microphones 13A and 13B is divided into each frequency band and the vector amount for each frequency band is measured and output to the band pass filter 15.

In the band-pass filter 15, since the frequency band selection switch 11B selects the band of 1000 to 3000 Hz, the selected frequency band 1000 is applied to the input from each of the frequency analysis units 14A and 14B.
Only the vector amount of ˜3000 Hz is passed and output to the sound source direction indicator 12. Then, the sound source direction indicator 12 displays the vector of the direction and the magnitude of the vector input to the vector display unit 12A in a mode such as lighting or changing the color. Therefore, the operator can use this sound source direction indicator 12
The sound source direction can be known by looking at the vector display of the vector display portion 12A.

Thus, in the sound source direction indicating device of this embodiment, the sound source direction indicating device is installed at a place where the sound source direction is desired to be specified, and the frequency band of the sound source is selected.
By looking at the vector display displayed by the sound source direction indicator 12, the sound source direction can be easily specified.

The invention of claim 2 is not limited to the above embodiment, and the way of dividing the frequency band of the sound source is not particularly limited.

[0033]

As described above, according to the invention of claim 1,
The energy intensity of the sound wave from the sound source is measured as a vector quantity by two microphones that are combined in a direction orthogonal to each other, the output of each microphone is frequency-analyzed by the frequency analysis unit, and the measurement is performed by a bandpass filter. Since sound waves of a certain frequency are passed and the strength of the sound waves of a specific frequency that has passed through the band-pass filter is vector-displayed on the two orthogonal axes by the sound source direction display unit, by using this sound source direction indicator, Rotate the two microphones combined in the direction,
Find the direction of the sound wave that maximizes the vector quantity of the sound wave of the specific frequency picked up by one microphone and conversely finds the vector quantity of the sound wave of the particular frequency picked up by the other microphone, and find the direction that gives the maximum vector quantity. The direction of the sound source can be specified, and the direction of the sound source of the sound wave of any frequency can be easily specified.

According to the second aspect of the invention, the energy intensity of the sound wave is measured by a vector quantity by the two microphones combined in the orthogonal direction, the output is frequency-analyzed by the frequency analysis unit, and is specified by the band pass filter. The sound source direction is specified by allowing only the sound wave of the frequency to pass, and further, the sound source direction calculation unit synthesizes the vector amount of the specific frequency measured by each of the two microphones, and the sound source direction display unit displays the sound source direction as a vector. So, by using this sound source direction indicator,
From the display of the sound source direction display section, the sound source direction of the sound wave of the specific frequency can be easily known.

[Brief description of drawings]

FIG. 1 is a plan view showing a mechanical configuration of the invention of claim 1.

FIG. 2 is a circuit block diagram of the above embodiment.

FIG. 3 is a plan view showing a mechanical configuration of the invention of claim 2.

FIG. 4 is a circuit block diagram of the above embodiment.

[Explanation of symbols]

 1 main body 1A power switch 1B frequency band selection switch 2 sound source direction indicator 2A vector display section 3A, 3B microphone 4A, 4B frequency analysis section 5 band pass filter 11 main body 11A power switch 11B frequency band selection switch 12 sound source direction indicator 12A vector Display unit 13A, 13B Microphone 14A, 14B Frequency analysis unit 15 Band pass filter 16 Sound source direction calculation unit

Front page continuation (72) Inventor Noriaki Ishikawa No. 1 Toshiba-cho, Fuchu-shi, Tokyo Inside Toshiba Fuchu factory

Claims (2)

[Claims] 1. Combined in directions orthogonal to each other,
Two movable microphones that measure the energy intensity of sound waves by a vector amount, a frequency analysis unit that frequency-analyzes the output of each of the microphones, and a bandpass that passes a specific frequency among the frequencies analyzed by each of the frequency analysis units. A sound source direction indicating device comprising: a filter; and a sound source direction display unit for vector-displaying the intensities of sound waves of a specific frequency passed by each of the band pass filters on two orthogonal axes. 2. Combined in directions orthogonal to each other,
Two microphones for measuring the energy intensity of sound waves by a vector quantity, a frequency analysis section for frequency-analyzing the output of each of the microphones, and a band-pass filter for passing a specific frequency among the frequencies analyzed by the frequency analysis section. A sound source direction calculation unit that specifies the direction of the sound source from the intensity of the sound wave of a specific frequency passed by each of the band pass filters; and a sound source direction display unit that displays the sound source direction specified by the sound source direction calculation unit. Sound source direction indicator.