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JPH02234598

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DESCRIPTION JPH02234598
[0001]
FIELD OF THE INVENTION The present invention relates to a microphone array in which a
plurality of microphones are disposed. 2. Description of the Related Art Heretofore, there has
been a microphone array configured by attaching a plurality of microphones to a fixed rod
having six rows at regular intervals. In this conventional microphone array, the plurality of
microphones are fixed at regular intervals in the lateral direction and also fixed in the receiving
direction. For example, Horiguchi et al., “Procedure of Symposium on Ultrasonic Electronics
under the heading of“ Digital Phase Delay Compensation Beamforming Scheme for Ultrasonic
Imaging ”(“ A Digital Phase Delay Compensation Beam-Forming Scheme for Ultrasonic Imaging
”) Proc. Of 8th Symp. On Ultrasonic Electronics, Tokyo 1987) pp. 215-217. SUMMARY OF THE
INVENTION In the above-described conventional microphone array, a plurality of microphones
can be held and fixed so that an input signal to an audiovisual system can be detected. However,
in the independent microphone and the amplifier which amplifies the delivery output of this
microphone, an inherent phase delay is produced respectively. In addition, in order to attach an
independent microphone to the fixed rod, even when the phase delay of the microphone and the
amplifier is the same, the passing wave of the same phase is obtained when the mounting
position of the microphone is different from each other in the receiving direction. However, there
is also a problem that the output signals from the multiple microphones mutually cause a phase
difference. On the other hand, in the audiovisual system, it is premised that all the plurality of
delivery outputs are detected with the same phase delay, and when different phase delays occur
in the delivery signals from the respective microphones, the audiovisual system There is a
problem that the quality of the reproduced image is degraded. An object of the present invention
is to provide a microphone array that solves these problems. [Means for Solving the Problems]
The present invention, in a microphone array in which a plurality of microphones are disposed,
comprises a plurality of independent microphones, a plurality of blocks corresponding to and
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holding each of the microphones, and a plurality of the above A support plate for collectively
holding the blocks so that they can move back and forth relative to each other; It consists of
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the ρ microphone array of the present
invention. Fig. 1 shows the configuration of a microphone array consisting of a plurality of
microphones. For each of a plurality of independent microphones 1 to 8, blocks 11 to 18 for
holding and fixing the corresponding microphones are prepared. The plurality of blocks 11 to 18
are collectively held and fixed by the support plates 21 and 22 so that they can move back and
forth. Further, the support plates 21 and 22 are fixed by the side plate 23. In FIG. 1, for
convenience of explanation, the cross-section is shown to show the configuration of the block 11
and the support plates 21 and 22 for the left front part, but in fact the side plate corresponding
to the right rear side plate 23 is the left front It is also attached to the part of. Hereinafter, the
ellipticity and coupling ovality of the blocks 11 to 18 and the support plate 21 will be described.
The front surface of the blocks 11 to 18 is provided with a through hole provided so that the
adjusting screws 31 to 38 can freely rotate and a mounting hole for attaching a microphone. The
support plate 21 which is at least one of the support plates 21 and 22 is provided with an
overhanging portion 24 having a shape projecting toward the front face of the blocks 11 to 18,
and the overhanging portion 24 is tapped so that the adjustment screws 31 to 38 engage. Make
a hole. The plurality of blocks 11 to 18 are connected to the support plate 21 by adjusting
screws 31 to 38. Adjustment operations for moving the positions of the individual blocks relative
to the support plate 2122 back and forth to each other are performed by the adjustment screws
31 to 38. In addition, by installing a spring 42 so as to insert the adjustment screws 31 to 38
between the front surface of the blocks 11 to 18 and the projecting portion 24 of the support
plate 21, pressing of the adjustment screws 31 to 38 is performed as a first To reliably realize
both pushing operation of the blocks 11 to 18 against the support plates 21 and 22 by rotation
in the direction and secondly drawing operation of the blocks 11 to 18 by rotation of the
adjusting screws 31 to 38 as a second Is possible. Furthermore, by providing tap holes in the
blocks 11 to 18 and screwing the embedded screws 43 for pressing the microphones 1 to 8,
fixing of the microphones 1 to 8 on the blocks 11 to 18 can be facilitated. However, the use of
the tap hole and the embedded screw does not become an essential component in the
construction of the microphone array according to the present invention, due to the combination
of the microphone outer shape and the inner diameter of the microphone mounting hole of the
block or the combination of bonding means.
And so on. According to the embodiment described in detail above, the front and back positions
of the plurality of microphones 1 to 8 independent by the rotation of the adjusting screws 31 to
38! Can be easily adjusted independently. In order to adjust the phase of each microphone 1 to 8
of the passing wave detection output outputted to the audiovisual system, as an example, a plane
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wave is transmitted to all the microphones 1 to 8 and all the others are based on a certain
microphone detection output This is achieved by adjusting the adjustment screws 31 to 38 by y4
so that the detection output of the microphone in the same phase as the reference detection
output. At this time, when the phase of the detection output of a certain microphone is advanced
compared to the reference detection output, the microphone position is retracted by pressing the
block against the support plate by rotation of the adjustment screw in the pressing direction as a
first step. And delay the detection phase. In addition, when the phase of the detection output of a
certain microphone is delayed compared to the reference detection output, secondly, the
corresponding microphone position is advanced by detection operation of the block by rotation
of the adjustment screw in the extraction direction, and detection Advance the phase. According
to the first and second operations, it is possible to adjust the mutual phase difference included in
the detection outputs of the plurality of independent microphones 1 to 8 the same. The
adjustment operation at this time may be a simple operation such as rotation of the adjustment
screw, and furthermore, a mechanism capable of adjusting the phase can also be realized by a
simple mechanism as shown in FIG. The configuration and operation of each block described
above can be easily analogized to those skilled in the art, and further detailed description will be
omitted. The embodiment of the present invention has been described in detail using the
configuration in which the adjustment screws 31 to 38 are provided on the front upper side of
the blocks 11 to 18 close to the delivery part of the microphone 1 for convenience of description.
It is easy to apply the configuration in which the adjusting screws 31 to 38 are provided on the
rear surface of the blocks 11 to 18 or provided below. In addition, although the configuration
using eight microphones 1 to 8 is described as an example, the number of the microphone array
of the present invention is not essential, and the present invention is not limited to an arbitrary
number of microphone arrays. It is clear that it is applicable. When assembling the microphone
array of this embodiment, the upper and lower two support plates 21 and 22 are assembled to
one side plate 23 in advance, and the blocks 11 to 18 are arranged in order from the block in
contact with the side plate 23. By inserting them between them and attaching the adjusting
screws 31 to 38 and the spring 42, the assembly of the large number of blocks 11 to 18 can be
easily performed.
According to the present invention, even when mutually different phase differences occur in the
passing wave detection outputs of the plurality of independent microphones, the mutual phase
differences are independently adjusted in the same order in any order. Can. At this time, the
adjustment operation may be a simple operation such as rotation of the adjustment screw, and
the adjustment operation with respect to a large number of microphones can be efficiently and
easily performed. In addition, the mechanism that enables the above-mentioned phase
adjustment can also be realized by a simple principle, and the mechanical reliability is also high.
According to the present invention described above, a microphone array which solves the
conventional operation can be obtained.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing an embodiment of the micro array of the present invention.
1-8 ... Microphone, 11-18 ... Block, 21, 22 ... Support plate, 23 ... Side plate, 31-38 ... Adjustment
spring, 42 ... Spring.
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