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JP2007243519

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007243519
The present invention provides an interphone device in which conversation contents do not
spread widely to the surroundings. An outdoor microphone includes an outdoor microphone
through which a visitor inputs a voice, and an outdoor speaker through which voices from a
visitor in the room are output, and an indoor microphone through which a correspondent inputs
voice on the indoor side. An interphone apparatus comprising an indoor speaker for outputting a
voice from a visitor, wherein the outdoor speaker on the outdoor side is constituted by an
ultrasonic speaker having directivity. [Selected figure] Figure 1
INTERPHONE DEVICE AND AUDIO OUTPUT METHOD IN THE DEVICE
[0001]
The present invention relates to an interphone apparatus and a voice output method in the
interphone apparatus, in which the contents of conversation between a visitor and a room service
person do not spread widely to the surroundings.
[0002]
The speaker of the conventional interphone apparatus is a normal loudspeaker, and there is a
problem that a neighbor resident or a passerby can hear a conversation because the voice of the
person in charge in the room leaks from the front door or the like to the outside.
Further, also in the room, in the interphone apparatus other than the handset type telephone set,
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there is a problem that the voice of the visitor spreads from the indoor speaker to the entire
room as in the outside.
[0003]
As described above, in the conventional interphone apparatus, there is a problem that the
response voice of the attendant in the room spreads widely to the surroundings and can be heard
by the nearby residents and passersby. Further, also in the room, in the interphone apparatus
other than the handset type telephone set, there is a problem that the voice of the visitor spreads
from the indoor speaker to the entire room.
[0004]
The present invention has been made to solve such a problem, and the object of the present
invention is to prevent the spread of the conversation between the visitor and the room
correspondent to the surrounding area. An apparatus, and providing an audio output in the
apparatus.
[0005]
The present invention has been made to solve the above-mentioned problems, and the intercom
apparatus according to the present invention is an outdoor microphone for a visitor to input
voice and an outdoor microphone for outputting voice from an indoor correspondent outside the
room. An interphone apparatus comprising a speaker, and an indoor microphone for receiving
voice from a visitor and an indoor speaker for outputting voice from a visitor on the indoor side,
wherein the outdoor speaker on the outdoor side has directivity. It is characterized by comprising
an ultrasonic speaker.
In the interphone apparatus having such a configuration, since the outdoor speaker on the
outdoor side is an ultrasonic speaker having directivity, the response voice of the indoor
correspondent spreads widely to the surroundings, so that the nearby residents and passersby
can You can avoid the problem of being heard by
[0006]
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Further, the intercom apparatus of the present invention includes, in the outdoor side, an outdoor
microphone through which a visitor inputs a voice and an outdoor speaker that outputs a voice
from a person in the room, and the attendant inputs a voice into the room. It is an intercom
apparatus provided with the following indoor microphone and the indoor speaker which outputs
the audio | voice from a visitor, Comprising: The indoor speaker of the said indoor side is
comprised with the ultrasonic speaker which has directivity. In the interphone apparatus having
such a configuration, since the indoor speaker on the indoor side is an ultrasonic speaker having
directivity, this can prevent the voice of the visitor from spreading from the indoor speaker to the
entire room.
[0007]
Further, the intercom apparatus of the present invention includes, in the outdoor side, an outdoor
microphone through which a visitor inputs a voice and an outdoor speaker that outputs a voice
from a person in the room, and the attendant inputs a voice into the room. An interphone
apparatus including an indoor microphone to be used and an indoor speaker for outputting voice
from a visitor, wherein the outdoor speaker on the outdoor side is constituted by an ultrasonic
speaker having directivity, and the indoor speaker on the indoor side is directional It is
characterized in that it is composed of an ultrasonic speaker having a characteristic. In the
interphone apparatus having such a configuration, the outdoor speaker on the outdoor side is an
ultrasonic speaker having directivity, and the indoor speaker on the indoor side is an ultrasonic
speaker having directivity. It is possible to avoid that the voice of the person's response spreads
widely from the entrance or the like to the surroundings, and also in the room, it is possible to
avoid that the voice of the visitor spreads from the indoor speaker to the entire room.
[0008]
In the interphone device of the present invention, the ultrasonic speaker is a piezoelectric
ultrasonic speaker. In the interphone apparatus having such a configuration, a piezoelectric
ultrasonic speaker is used as an ultrasonic speaker. With this, an inexpensive ultrasonic speaker
having a simple structure is used to meet visitors. It can be avoided that the contents of
conversation with a person spread widely to the surroundings.
[0009]
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In the interphone device of the present invention, the ultrasonic speaker is an electrostatic
ultrasonic speaker. In the interphone apparatus of such a configuration, an electrostatic
ultrasonic speaker is used as an ultrasonic speaker, whereby the conversation contents between
the visitor and the correspondent spread widely to the surroundings. In addition to the avoidable
effects, the speech quality of speech can be improved by using an electrostatic ultrasound
speaker with broadband characteristics.
[0010]
In the audio output method of the present invention, an outdoor microphone for receiving voice
input by a visitor, and an outdoor speaker for outputting audio from a response person in the
room are provided outside the room, and the response person receives voice on the indoor side.
An audio output method in an interphone apparatus comprising an indoor microphone for
inputting and an indoor speaker for outputting voice from a visitor, wherein an ultrasonic
speaker having directivity is used as the outdoor speaker outside the room. Do. With such a
method, since the outdoor speaker on the outdoor side is made into an ultrasonic speaker having
directivity, the response voice of the person in charge in the room spreads widely to the
surroundings and can be heard by the nearby residents and passersby. It can avoid the problem
of
[0011]
Next, the best mode for carrying out the present invention will be described with reference to the
drawings.
[0012]
FIG. 1 is a view showing a first embodiment of the interphone apparatus of the present invention.
The interphone device 1 shown in FIG. 1 is an example in which an ultrasonic speaker is used as
an outdoor speaker on the outdoor side (for example, a front door or the like).
[0013]
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In FIG. 1, the audio transmission system from the outside to the room is constituted by a
conventional ordinary outdoor microphone (outdoor microphone) 12, an amplifier 11, and an
indoor speaker (loudspeaker) 10. That is, the voice of the visitor is input to the outdoor
microphone 12, and the voice signal of the visitor input to the outdoor microphone 12 is
amplified by the amplifier 11 and output from the indoor speaker 10.
[0014]
On the other hand, an ultrasonic speaker is used for the outdoor speaker 25 in the audio
transmission system from the indoor to the outdoor unlike the conventional case. The voice of
the responder in the room is input to the indoor microphone (outdoor microphone) 21, and the
voice signal input to the indoor microphone 21 is output to the modulator 22. The modulator 22
modulates the carrier wave (carrier wave) of the ultrasonic frequency band output from the
ultrasonic wave generator 23 by the audio signal input from the indoor microphone 21. The
modulated signal is amplified by the power amplifier 24, and the outdoor speaker (ultrasonic
speaker) 25 is driven by the modulated signal amplified by the power amplifier 24.
[0015]
The outdoor speaker (ultrasonic speaker) 25 has an ultrasonic transducer inside, and the
ultrasonic transducer outputs a modulated wave obtained by modulating a carrier wave in the
ultrasonic band with an audio signal in the audible band, thereby making it sharp. Sounds having
directivity can be reproduced locally. (The detailed configuration and operation of the ultrasonic
speaker will be described later. )
[0016]
Therefore, for example, as shown in FIG. 3, an outdoor speaker (ultrasonic speaker) 25 is
installed above the entrance tip 4, and the outdoor speaker 25 radiates the ultrasonic wave
modulated by the audio signal toward the visitor 3 Do. Thus, it is possible to configure an
intercom apparatus in which the voice of the correspondent can be heard only by the visitor and
not heard around the visitor.
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[0017]
Moreover, FIG. 2 is a figure which shows 2nd Embodiment of the intercom apparatus of this
invention. The intercom apparatus 2 shown in FIG. 2 is an example in which not only the outdoor
speaker 25 but also the indoor speaker 14 is configured by an ultrasonic speaker.
[0018]
In FIG. 2, the voice of the visitor outside the room is input to the outdoor microphone 12. The
audio signal input to the outdoor microphone 12 is output to the modulator 13. The modulator
13 modulates the carrier wave (carrier wave) of the ultrasonic frequency band output from the
ultrasonic wave generator 23 by the audio signal input from the outdoor microphone 12. The
modulated signal is amplified by the power amplifier 11A, and the indoor speaker (ultrasonic
speaker) 14 is driven by the modulated signal amplified by the power amplifier 11A.
[0019]
With such a configuration, it is possible to prevent the response voice of the correspondent in the
room from spreading widely to the surroundings from the front door etc. Also, in the room, the
voice of the visitor is prevented from spreading to the entire room as well as the outside. it can.
[0020]
[Description of Ultrasonic Speaker Used in the Present Invention] As described above, the
interphone device of the present invention is characterized by using an ultrasonic speaker having
directivity, and here, the ultrasonic speaker The configuration and operation of the
[0021]
The ultrasonic speaker has an ultrasonic transducer, and this ultrasonic transducer outputs a
modulated wave obtained by modulating the carrier wave of the ultrasonic band with an audio
signal in the audible band, thereby reproducing sound having sharp directivity. be able to.
As this ultrasonic transducer, one using an electrostatic ultrasonic transducer is called an
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electrostatic ultrasonic speaker.
[0022]
FIG. 4 is a view showing a configuration example of an electrostatic ultrasonic transducer.
The electrostatic ultrasonic transducer shown in FIG. 4 is sandwiched between a pair of fixed
electrodes 30, 31 including a conductive member formed of a conductive material functioning as
an electrode, and a pair of fixed electrodes, and a vibrating electrode (conductive layer) And a
vibrating membrane 32 having 32A. The vibrating film 32 has a dielectric 32B to be an
insulating layer and a vibrating electrode 32A formed of a conductive material, and the vibrating
electrode 32A has a single polarity (even positive polarity) by the DC bias power supply 36. The
DC bias voltage of any of the negative polarities may be applied.
[0023]
Further, the pair of fixed electrodes 30, 31 have the same number and a plurality of through
holes 34 at the positions facing each other through the vibrating film 32, and between the pair of
fixed electrodes 30, 31, alternating current by the signal sources 37A, 37B. A signal is to be
applied. Capacitors are respectively formed on the fixed electrode 30 and the vibrating electrode
32A, and the fixed electrode 31 and the vibrating electrode 32A.
[0024]
In the above configuration, in the electrostatic ultrasonic transducer, a DC bias voltage of a single
polarity (positive in this example) is applied to the vibrating electrode 32A of the diaphragm 32
by the DC bias power supply 36. On the other hand, an alternating current signal is applied to
the pair of fixed electrodes 30, 31 by the signal sources 37A, 37B. As a result, in the positive half
cycle of the alternating current signal output from the signal sources 37A and 37B, a positive
voltage is applied to the fixed electrode 30, so the surface portion 33A of the vibrating film 32
not held by the fixed electrodes is The electrostatic repulsive force acts on the surface portion
33A, and the surface portion 33A is pulled downward in FIG. Further, at this time, since a
negative voltage is applied to the opposing fixed electrode 31, an electrostatic attraction force
acts on the back surface portion 33B which is the back surface side of the surface portion 33A of
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the vibrating film 32, The back surface portion 33B is pulled further downward in FIG.
[0025]
Therefore, the film portion of the vibrating film 32 which is not held by the pair of fixed
electrodes 30 and 31 receives the electrostatic repulsive force and the electrostatic attractive
force in the same direction. The same applies to the negative half cycle of the alternating current
signal output from the signal sources 37A and 37B, in the surface portion 33A of the vibrating
membrane 32 as shown in FIG. In FIG. 4, an electrostatic repulsive force acts on the upper side,
and a film portion of the vibrating film 32 which is not sandwiched by the pair of fixed electrodes
30, 31 receives an electrostatic attractive force and an electrostatic repulsive force in the same
direction. In this manner, the vibrating film 32 receives the electrostatic attraction force and the
electrostatic repulsion force in the same direction according to the change of the polarity of the
alternating current signal, and the direction in which the electrostatic force acts alternately
changes. An audio signal of a sound pressure level sufficient to obtain a parametric array effect
can be generated.
[0026]
Thus, the ultrasonic transducer shown in FIG. 4 is called a Push-Pull type electrostatic ultrasonic
transducer because the vibrating membrane 32 vibrates by receiving force from the pair of fixed
electrodes 30 and 31. ing. As described above, in the push-pull type electrostatic ultrasonic
transducer, a high voltage DC bias voltage is applied to the vibrating film, and an alternating
voltage is applied to the fixed electrode, whereby the fixed electrode-vibration film is obtained.
The membrane portion vibrates due to electrostatic force (suction and repulsion) acting on the In
this case, in order to realize the vibration of the ultrasonic band, it is necessary to set the hole
diameter of the vibrating portion to several mm or less, and as shown in FIG. 4B, providing a
large number of through holes (vibration holes) 34. Thus, it is possible to configure a transducer
with high tracking ability and a large output.
[0027]
The electrostatic ultrasonic speaker used in the interphone apparatus of the present invention is
configured of the above-described push-pull electrostatic ultrasonic transducer. As the
electrostatic ultrasonic transducer, there is also an electrostatic ultrasonic transducer called a
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pull type in which the fixed electrode is disposed only on one side of the vibrating film, and in the
interphone device of the present invention, this pull is used. An ultrasonic speaker composed of
(Pull) type electrostatic ultrasonic transducers can also be used.
[0028]
The electrostatic ultrasonic speaker has been described above, but a piezoelectric ultrasonic
speaker can also be used in the interphone device of the present invention. The piezoelectric
ultrasonic speaker is composed of a piezoelectric ultrasonic transducer.
[0029]
FIG. 5 is a view showing an example of the configuration of a piezoelectric ultrasonic transducer,
which uses a piezoelectric ceramic as a vibrating element to convert an electrical signal to an
ultrasonic wave and convert an ultrasonic wave to an electric signal (transmission of ultrasonic
wave 1 shows an exemplary configuration of a piezoelectric ultrasonic transducer that performs
both of 5 (A) shows a bimorph ultrasonic transducer, and FIG. 5 (B) shows a unimorph ultrasonic
transducer.
[0030]
The bimorph-type ultrasonic transducer shown in FIG. 5A comprises two piezoelectric elements
(piezoelectric ceramic) 41 and 42, a cone 43, a case 44, leads 45 and 46, and a screen 47. There
is. The piezoelectric elements 41 and 42 are bonded to each other, and the lead 45 and the lead
46 are connected to the surface opposite to the bonding surface, respectively. In the unimorph
type ultrasonic transducer shown in FIG. 5B, the configuration of the piezoelectric element 48 is
different from that of the bimorph type, but basically the operation principle is the same.
[0031]
Since the piezoelectric ultrasonic transducers shown in FIGS. 5A and 5B utilize the resonance
phenomenon of piezoelectric ceramic, the characteristics of transmission and reception of
ultrasonic waves are relatively narrow around the resonance frequency. It becomes good in the
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frequency band. However, since the piezoelectric transducer utilizes the sharp resonance
characteristic of the element, high sound pressure can be obtained, but the frequency band is
very narrow. For this reason, in an ultrasonic speaker using a piezoelectric transducer, the
reproducible frequency band is narrow, and there is a tendency that the reproduction sound
quality is worse compared to the loudspeaker.
[0032]
Next, FIG. 6 shows a general configuration example of an ultrasonic speaker. An ultrasonic
speaker performs AM modulation with an audio signal (audible area signal) on an ultrasonic
wave called a carrier wave, and when this is emitted into the air, the original audio signal is selfreproduced in the air due to air nonlinearity. It is. That is, since the sound wave is a compression
wave propagating through the air as a medium, in the process of propagation of the modulated
ultrasonic wave, the dense part and the sparse part of the air become prominent, and the dense
part has a high speed of sound and is sparse. As the sound velocity is slowed in the part, the
modulation wave itself is distorted, so that the waveform is separated into the carrier wave
(ultrasonic wave) and the audio wave (original audio signal), and we human beings only audible
sound below 20 kHz (original audio signal) Is a principle that can be heard, and is generally
called a parametric array effect.
[0033]
The ultrasonic speaker 50 shown in FIG. 6 includes a sound source (audio signal) 51 that
generates a signal wave in the audible wave frequency band, a carrier wave signal source 52 that
generates and outputs a carrier wave in the ultrasonic frequency band, and a modulator 53. , A
power amplifier 54, and an ultrasonic transducer 55.
[0034]
In the above configuration, the modulator 53 modulates the carrier wave of the ultrasonic
frequency band output from the carrier signal source 52 by the audio signal output from the
sound source 51.
The modulation signal is amplified by the power amplifier 54, and the ultrasonic transducer 55 is
driven by the modulation signal amplified by the power amplifier 54. As a result, the modulated
signal is converted to a sound wave of a finite amplitude level by the ultrasonic transducer 55,
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and this sound wave is emitted into the medium (in air) and the sound noise in the original audio
frequency band by the nonlinear effect of the medium (air). Is self-regenerating.
[0035]
As mentioned above, although the embodiment of the present invention was described, the
intercom apparatus of the present invention is not limited only to the above-mentioned
illustrated example, and various changes may be added within the scope of the present invention.
Of course.
[0036]
FIG. 1 is a diagram showing a first embodiment of an interphone device of the present invention.
The figure which shows 2nd Embodiment of the intercom apparatus of this invention. The figure
which shows the example of arrangement of an outdoor speaker. The figure which shows the
structural example of an electrostatic-type ultrasonic transducer. The figure which shows the
structural example of a piezoelectric-type ultrasonic transducer. The figure which shows the
general structural example of an ultrasonic speaker.
Explanation of sign
[0037]
1, 2 intercom devices, 3 visitors, 10 indoor speakers (loudspeakers), 11 amplifiers, 11 A power
amplifiers, 12 outdoor microphones, 13 modulators, 14 indoor speakers (ultrasonic speakers),
21 indoor microphones, 22 modulators, 23 ultrasonic generator, 24 power amplifier, 25 outdoor
speaker (ultrasonic speaker) 30, 31 fixed electrode, 32 diaphragm, 32A vibrating electrode, 32B
dielectric, 34 through holes, 36 DC bias power supply, 37A, 37B signal source 41, 42, 48 Piezo
elements, 43 cones, 44 cases, 45, 46 leads, 47 screens, 50 ultrasonic speakers, 51 sound sources
(audio signals), 52 carrier signal sources, 53 modulators, 54 power amplifiers, 55 or more Sound
transducer,
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