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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of collecting acoustic data.
2. Description of the Related Art Generally, when a sound detected by a microphone is
reproduced, due to its mechanical nature, it sounds different from the sound that a person hears
on the spot. This is because the human being listens to the surrounding situation in general or
the target sound is extracted and listened from the wide area information of the sound
consciously and unconsciously.
By the way, with a microphone having directivity, it is possible to sharply capture a target sound
according to the installation direction, and it is possible to function the selectivity of human
hearing. However, if the direction of the microphone is different, the target sound is mixed with
the surrounding sound, so that its characteristics can not be captured remarkably.
On the other hand, with a microphone having no directivity, it is possible to grasp surrounding
conditions in order to capture sounds in all directions, and it is possible to function the wide-area
nature of human hearing. However, if the level of the target sound is not high, it will be mixed
with the surrounding sound, and the characteristics of the target sound can not be captured
As described above, although there are problems with each of the directional ones and the nondirectional ones, conventionally, only one of the directional microphones and the non-directional
microphones is used. There is a problem that desired acoustic data can not be collected
efficiently. Therefore, an object of the present invention is to combine the selectivity such as
human auditory sense with the wide area so that acoustic data can be efficiently collected.
[Means for Solving the Problems] In order to solve such problems, in the present invention,
microphones having directivity, microphones having no directivity, and switching means for
switching the outputs from these two types of microphones are provided. It is characterized in
that the sound data is switched and collected by the switching means.
[Operation] Two types of microphones, one with directivity and one without directivity, are
collected to collect acoustic data, thereby providing selectivity such as human hearing and wide
area, and efficiently providing acoustic data. Make it possible to collect.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is an explanatory view for explaining an
embodiment of the present invention.
This is a schematic view showing the interior of a building such as a machine room, 1A and 1B
are sound sources such as mechanical equipment, 2 is a television camera, 3 is a microphone
with directivity, 4 is a microphone without directivity, 5 shows a window and 6 shows an
acoustic output device such as a speaker.
That is, in the machine room or the like, there are various sound sources such as the sounds
generated from the devices 1A and 1B, the voice of the inspector, the sound of rain and lightning
from the window 5, the sound of opening and closing the door.
Such ambient sound can be obtained here by the non-directional microphone 4 and can be
grasped by the sound output device 6 by a inspector in a monitoring room provided apart from
the machine room.
In addition, by using the directional microphone 3, it is possible to obtain target acoustic data
while the inspector in the monitoring room is present. For this reason, switching means for
switching the audio output from the microphones 3 and 4 is provided in the vicinity of the
Furthermore, in order to enhance the selectivity of the microphone 3, it is desirable to be able to
adjust the vertical and horizontal positions and the position. Here, by attaching to the television
camera 2 capable of controlling pan, tilt, zoom, etc., the microphone 3 is also adjusted in the
vertical and horizontal directions in conjunction with the movement of the television camera 2,
As a result, it becomes possible to obtain sound data that matches the image data.
FIG. 2 shows an application example of the present invention. The microphone 3 having
directivity and the microphone 4 having no directivity are mounted on the moving body 7, and
when it is far from the target object, ambient sound is collected by the microphone 4 having no
directivity. When the target object is approached, the microphone 3 having directivity is used to
selectively collect the sound from the object.
According to the present invention, sounds of different natures can be collected by using two
types of microphones. Then, by selectively using these, it is possible to obtain voice data with the
same selectivity and wide area as a person. As a result, application to various fields as described
below can be considered. (1) Sound service in plant equipment monitoring (2) Application to
voice input unit in information system etc. (3) Combined system of image data and sound data (4)
Sound data collection system equipped with moving object
Brief description of the drawings
1 is a schematic diagram showing an embodiment of the present invention.
2 is a schematic diagram showing an application example of the present invention.
Explanation of sign
DESCRIPTION OF SYMBOLS 1A, 1B ... Sound source, 2 ... Television camera, 3 ... Microphone
(with directivity), 4 ... Microphone (there is no directivity), 5 ... Window, 6 ... Sound output device,
7 ... Moving body.
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