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JP2013055571

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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
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DESCRIPTION JP2013055571
Abstract: A mobile phone terminal that is both compact and lightweight, which can use both a
panel speaker and bone conduction, a voice transmission method for a mobile phone terminal,
and a voice transmission program for a mobile phone terminal I will provide a. A mobile phone
terminal 100 displays a first vibrator 124 and a second vibrator 125 provided so as to vibrate
the display unit 121 and a first vibrator 124 for display. The first conduction mode is configured
to perform a bone conduction mode in which the portion 121 is vibrated so as to be bone
conductive, and a speaker mode in which the second vibrator 125 is vibrated to vibrate the
display portion 121 to generate air conduction sound. And a control unit 133 that controls the
second vibrator 125. [Selected figure] Figure 3
Mobile phone terminal, voice transmission method for mobile phone terminal, voice transmission
program for mobile phone terminal
[0001]
The present invention relates to a portable telephone terminal capable of utilizing a bone
conduction mode and a speaker mode, a voice transmission method of the portable telephone
terminal, and a voice transmission program of the portable telephone terminal.
[0002]
As means for emitting an air-conduction sound that vibrates air at the time of an incoming call of
a mobile phone terminal, music reproduction, etc., one using a panel speaker instead of a
conventional speaker is known (for example, see Patent Document 1).
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However, in the case of a panel speaker, it is often undesirable to use the speaker during a call
because the sound leaks around.
[0003]
On the other hand, bone conduction is known as a voice transmission method with less sound
leakage (see, for example, Patent Document 2).
[0004]
Patent No. 3929465 gazette JP, 2003-145048, A
[0005]
However, when both the panel speaker and the bone conduction are installed in the mobile
phone terminal, there is a problem that it is not possible to meet the demand for downsizing,
weight reduction and price reduction of the terminal.
[0006]
The subject of the present invention is a small-sized, lightweight, low-cost portable telephone
terminal that can use both of a panel speaker and bone conduction, a voice transmission method
of the portable telephone terminal, and a voice of the portable telephone terminal It is to provide
a transmission program.
[0007]
The present invention proposes the following matters in order to solve the above-mentioned
problems.
In addition, in order to make an understanding easy, although the code | symbol corresponding
to embodiment of this invention is attached and demonstrated, it is not limited to this.
[0008]
(1) In the present invention, at least one vibrator (124, 224, 125, 225, 226) provided so as to
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vibrate at least one of the display panel (121, 221) or the exterior member, and the above A bone
conduction mode in which a vibrator is vibrated to vibrate at least one of the display panel or the
exterior member so that bone conduction is possible, and a vibrator is vibrated to vibrate at least
one of the display panel or the exterior member A mobile phone terminal (100, 200) is proposed,
comprising: a control unit (133, 233) for controlling the vibrator to perform a speaker mode of
vibrating so as to generate a sound.
[0009]
According to the present invention, the vibrator is provided so as to vibrate at least one of the
display panel and the exterior member.
The control unit vibrates the vibrator to vibrate at least one of the display panel or the exterior
member so that bone conduction is possible, and the vibrator vibrates to vibrate at least one of
the display panel or the exterior member. The vibrator is controlled to perform a speaker mode
in which vibration is caused to occur.
Therefore, the vibrator can be shared in the bone conduction mode and the speaker mode, and
the portable telephone terminal capable of using both of the panel speaker and the bone
conduction can be miniaturized, reduced in weight and price.
[0010]
(2) The present invention provides the mobile phone terminal according to (1), wherein the
vibrator (124, 224, 125, 225, 226) vibrates at least in the bone conduction mode. 224) and a
second transducer (125, 225) disposed at a position different from the first transducer, wherein
the second transducer is configured to reduce sound leakage in the bone conduction mode. A
mobile phone terminal (100, 200) is proposed, which comprises: a vibration waveform changer
(132, 232A, 232B) for vibrating a vibrator.
[0011]
According to the present invention, the vibrator includes the first vibrator that vibrates at least in
the bone conduction mode, and the second vibrator arranged at a position different from the first
vibrator.
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The vibration waveform changing unit vibrates the second vibrator so as to reduce sound leakage
in the bone conduction mode.
Therefore, sound leakage in the bone conduction mode can be reduced.
[0012]
(3) In the mobile phone terminal according to (2), the vibration waveform changing unit (132,
232A, 232B) according to the present invention is characterized in that the phase of the
vibration of the second vibrator (125, 225) A mobile phone terminal (100, 200) is proposed
which is characterized in that the vibration waveform of one of the transducers (124, 224) is
inverted.
[0013]
According to the present invention, the vibration waveform changing unit inverts the phase of
the vibration of the second vibrator with respect to the vibration waveform of the first vibrator.
Therefore, the sound leakage component can be reduced by canceling each other's vibration by
the vibration of the first vibrator and the inverted vibration of the second vibrator.
[0014]
(4) In the mobile phone terminal according to (2) or (3), the second vibrator (125) according to
the present invention is disposed at an isolated position apart from the first vibrator (124). A
mobile phone terminal (100) is proposed which is characterized in that vibration in the same
phase as the first vibrator is performed in the speaker mode.
[0015]
According to the present invention, the second vibrator is disposed at an isolated position apart
from the first vibrator, and in the speaker mode, vibrates in phase with the first vibrator.
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Therefore, by vibrating each of the first vibrator and the second vibrator according to the signal
of each channel of stereo sound, stereo sound can be reproduced in the speaker mode.
[0016]
(5) The present invention provides the mobile phone terminal according to (2) or (3), including a
third transducer (226) disposed at an isolated position apart from the first transducer (224). The
second vibrator (225) is disposed at a position closer to the first vibrator than the isolated
position, and vibrates so as to reduce sound leakage in the bone conduction mode. In the speaker
mode, no vibration is performed, and in the bone conduction mode, the third vibrator does not
vibrate, and in the speaker mode, vibration in the same phase as the first vibrator is performed.
We have proposed a mobile phone terminal (200) as a feature.
[0017]
According to the present invention, the third vibrator is disposed at an isolated position apart
from the first vibrator.
The second vibrator is disposed closer to the first vibrator than the isolated position, and vibrates
so as to reduce sound leakage in the bone conduction mode and does not vibrate in the speaker
mode. .
Therefore, the effect of suppressing the sound leakage in the bone conduction mode can be
further enhanced by performing the vibration that cancels each other's vibration at a position
closer to the first vibrator and the second vibrator. The third vibrator does not vibrate in the
bone conduction mode, and vibrates in the same phase as the first vibrator in the speaker mode.
Therefore, by vibrating each of the first vibrator and the third vibrator according to the signal of
each channel of stereo sound, stereo sound can be reproduced in the speaker mode.
[0018]
(6) In the mobile phone terminal according to (4) or (5), in the present invention, the first
transducer (224) is BTL connected in the speaker mode, and the vibration waveform changing
unit ( 232A, 232B) propose a mobile phone terminal (200) characterized by having a function of
generating a signal of opposite phase in a circuit of BTL connection.
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[0019]
According to the present invention, the first vibrator is BTL connected in the speaker mode.
The vibration waveform changer has a function of generating signals in antiphase in a circuit of
BTL connection. Therefore, the vibration waveform changer can be used for both sound leakage
suppression and BTL connection, and the configuration can be simplified. Therefore, the mobile
phone terminal can be miniaturized, reduced in weight, and reduced in price. Further, since the
amplifier output can be doubled by BTL connection, a large vibration output required in the
speaker mode can be obtained.
[0020]
(7) The present invention is provided with at least one vibrator (124, 224, 125, 225, 226)
provided to be able to vibrate at least one of the display panel (121, 221) or the exterior
member. A voice transmission method for a mobile phone terminal (100, 200), comprising: a
bone conduction mode in which the vibrator is vibrated to vibrate at least one of the display
panel or the exterior member so as to be bone conductive; and the vibrator Controlling the
vibrator so as to perform a speaker mode of vibrating at least one of the display panel or the
exterior member so as to generate air conduction sound by vibrating the sound of the mobile
phone terminal We propose a transmission method.
[0021]
According to the present invention, at least one of the display panel or the exterior member is
vibrated by causing the oscillator to vibrate so as to cause at least one of the display panel or the
exterior member to vibrate so as to cause bone conduction. The vibrator is controlled to perform
a speaker mode to vibrate so as to generate a guided sound.
Therefore, the vibrator can be shared in the bone conduction mode and the speaker mode, and
the portable telephone terminal capable of using both of the panel speaker and the bone
conduction can be miniaturized, reduced in weight and price.
[0022]
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(8) The present invention is provided with at least one vibrator (124, 224, 125, 225, 226)
provided to be able to vibrate at least one of the display panel (121, 221) or the exterior
member. A voice transmission program of a mobile phone terminal (100, 200), wherein the
computer (133, 233) of the mobile phone terminal can vibrate the vibrator to cause bone
conduction of at least one of the display panel or the exterior member. Control the vibrator in
such a manner as to perform a bone conduction mode in which the vibrator is vibrated, and a
speaker mode in which the vibrator is vibrated to vibrate at least one of the display panel or the
exterior member to generate air conduction sound. We have proposed a voice communication
program of a mobile phone terminal to execute the procedure.
[0023]
According to the present invention, the sound transmission program causes the computer of the
mobile phone terminal to vibrate the vibrator so as to cause the vibrator to vibrate so that at
least one of the display panel or the exterior member can be bone-conductive, and the vibrator to
vibrate. And a step of controlling the vibrator to perform a speaker mode in which at least one of
the display panel and the exterior member is vibrated to generate air conduction sound.
Therefore, the vibrator can be shared in the bone conduction mode and the speaker mode, and
the portable telephone terminal capable of using both of the panel speaker and the bone
conduction can be miniaturized, reduced in weight and price.
[0024]
According to the present invention, a vibrator can be shared in the bone conduction mode and
the speaker mode, and a portable telephone terminal capable of using both of the panel speaker
and the bone conduction can be miniaturized, reduced in weight and price. Further, according to
the present invention, it is possible to reduce the sound leakage in the bone conduction mode.
[0025]
It is a figure which shows the mobile telephone terminal 100 of 1st Embodiment by this
invention. It is the figure which showed typically the cross section which cut | disconnected a
part of mobile telephone terminal 100 at the time of bone conduction mode by arrow AA in FIG.
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It is a block diagram explaining operation | movement of the mobile telephone terminal 100 at
the time of bone conduction mode. It is the figure which showed typically the cross section which
cut | disconnected a part of mobile telephone terminal 100 at the time of speaker mode by arrow
AA in FIG. It is a block diagram explaining operation | movement of the mobile telephone
terminal 100 at the time of speaker mode. It is a figure which shows the mobile telephone
terminal 200 of 2nd Embodiment by this invention. It is the figure which showed typically the
cross section which cut | disconnected a part of mobile telephone terminal 200 at the time of
bone conduction mode by arrow BB in FIG. It is a block diagram explaining operation | movement
of the mobile telephone terminal 200 at the time of bone conduction mode. It is the figure which
showed typically the cross section which cut | disconnected a part of mobile telephone terminal
200 at the time of speaker mode by arrow BB in FIG. It is a block diagram explaining operation |
movement of the mobile telephone terminal 200 at the time of speaker mode.
[0026]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. In addition, the component in this embodiment can be suitably substituted with the
existing component etc., and various variations including combinations with other existing
components are possible. Therefore, the description of the present embodiment does not limit
the contents of the invention described in the claims.
[0027]
First Embodiment FIG. 1 is a view showing a mobile telephone terminal 100 according to a first
embodiment of the present invention. The mobile telephone terminal 100 is a so-called slide-type
mobile telephone terminal in which the first housing 110 and the second housing 120 are
formed as movable parts that can slide relative to each other. FIG. 1 shows a usage pattern in
which the first housing 110 and the second housing 120 are slid open. Hereinafter, the surface
on which the first housing 110 and the second housing 120 can be seen in FIG. 1 will be referred
to as a surface. On the other hand, the surface on the side hidden in FIG. 4 of the first housing
110 and the second housing 120 is called the back surface.
[0028]
On the surface of the first housing 110, a first operation key 111 and a microphone 112 are
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provided. The first operation key 111 is an operation member operated when inputting numbers
and characters, making various selections, and the like. The microphone 112 is a microphone for
inputting voice during a call.
[0029]
A display portion 121 and a second operation key 122 are provided on the surface of the second
housing 120.
[0030]
The display unit 121 is a display panel that displays various information of the mobile phone
terminal 100.
[0031]
The second operation key 122 is an operation member provided so as to be able to perform basic
operations even in the storage form in which the first operation key 111 is hidden by the second
housing 120. is there.
[0032]
The mobile telephone terminal 100 of the first embodiment is provided with two voice
transmission methods of a bone conduction mode and a speaker mode.
In the bone conduction mode, the display unit 121 is vibrated to allow bone conduction.
In the bone conduction mode, the display unit 121 transmits vibration to the user's skull or the
like by being brought into contact with the user's head or the like.
In the speaker mode, the display unit 121 vibrates to generate air conduction sound and
functions as a panel speaker. In order to use these in the bone conduction mode and the speaker
mode, a first vibrator 124 and a second vibrator 125 are provided inside the display unit 121.
[0033]
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The first vibrator 124 is provided at a position on the upper end side away from the second
operation key 122 in the area of the display unit 121. Therefore, the position where the first
vibrator 124 is disposed is a position where the user can easily touch the skull or the like during
a call. The first vibrator 124 is provided in close contact with the back surface side of the display
portion 121, and can vibrate the display portion 121. The first vibrator 124 of the first
embodiment vibrates in the bone conduction mode and in the speaker mode.
[0034]
The second vibrator 125 is disposed at a position on the lower end side close to the second
operation key 122 in the area of the display unit 121, that is, at an isolated position apart from
the first vibrator 124. The second vibrator 125 is provided in close contact with the back surface
side of the display portion 121, and can vibrate the display portion 121. The second vibrator 125
of the first embodiment vibrates in the same phase as the first vibrator 124 in the speaker mode.
Further, in the bone conduction mode, the second vibrator 125 vibrates in the opposite phase in
which the phase is reversed from the vibration waveform of the first vibrator 124. As the first
vibrator 124 and the second vibrator 125, for example, a bimorph vibrator in which piezoelectric
elements are stacked can be used.
[0035]
FIG. 2 is a view schematically showing a cross section obtained by cutting a part of the mobile
phone terminal 100 in the bone conduction mode by an arrow A-A in FIG. FIG. 3 is a block
diagram for explaining the operation of the mobile phone terminal 100 in the bone conduction
mode. The mobile phone terminal 100 includes an amplifier unit 131A, an amplifier unit 131B, a
polarity reversing unit 132A, a polarity reversing unit 132B, and a control unit 133.
[0036]
The amplifier unit 131A is an amplifier for driving the first vibrator 124. The amplifier unit 131A
has two amplifiers, each having an output, one directly connected to the first vibrator 124, and
the other via the polarity inverting unit 132A and the switch SW101. It is connected to the first
vibrator 124 or to the second vibrator 125.
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[0037]
The amplifier unit 131B is an amplifier for driving the second vibrator 125 in the speaker mode
shown in FIG. 5 described later. The amplifier unit 131B, like the amplifier unit 131A, has two
amplifiers, each of which has an output, and one is connected to the second vibrator 125 through
the switch SW103, The other is connected to the second vibrator 125 via the polarity inverting
unit 132B and the switch SW104.
[0038]
In the bone conduction mode, the switch SW101 and the switch SW103 are switched to the side
where the polarity inverting unit 132A and the second vibrator 125 are connected. Further, the
switch SW102 is closed, and the switch SW104 is switched to the side where the second vibrator
125 is grounded. Furthermore, the amplifier unit 131B is turned off. Then, in the bone
conduction mode, the sound signal to be transmitted by bone conduction is such that the output
from one of the two amplifiers of the amplifier unit 131A is transmitted to the first vibrator 124,
and the output from the other amplifier is The signal is transmitted to the second vibrator 125 as
a signal of the opposite phase by the polarity inverting unit 132A.
[0039]
The polarity reversing unit 132A is a vibration waveform changing unit that vibrates the second
vibrator 125 so as to reduce the sound leakage by reversing the output from the amplifier as
described above in the bone conduction mode. Therefore, in the bone conduction mode, the
second vibrator 125 vibrates with a vibration waveform in reverse phase to the vibration
waveform of the first vibrator 124. On the other hand, in the speaker mode to be described later,
the polarity inverting unit 132A inverts the audio signal so that the voltage applied to the first
vibrator 124 is doubled in BTL (Bridged Tied Load or Bridged Transless or Balanced
Transformerless) connection. And convert it into a signal of opposite phase.
[0040]
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The polarity reversing unit 132B is OFF in the bone conduction mode. On the other hand, in the
speaker mode to be described later, the polarity inversion unit 132B inverts the audio signal and
converts it into a signal of the opposite phase so that the voltage applied to the second vibrator
125 is doubled in the BTL connection.
[0041]
In the bone conduction mode, when vibration is transmitted to, for example, the skull, the skull
vibrates, and the vibration is transmitted through the bone to the cochlea which is an auditory
organ, and so-called voice transmission by bone conduction is realized. In addition, even if the
vibration is weak and does not cause the vibration such that the skull vibrates, the human body
such as the pinna near the user's ear can be vibrated according to the audio signal. This vibration
can directly vibrate the tympanic membrane, and can also generate an air conduction sound in
the ear canal, and the user can sense the air conduction sound by the tympanic membrane and
recognize it as a sound.
[0042]
In the bone conduction mode utilizing such human body vibration, sound leakage is ideally small.
However, since the first vibrator 124 vibrates the display unit 121, there is a possibility that
sound leakage may occur as air conduction sound which is originally unnecessary.
[0043]
In the first embodiment, in the bone conduction mode, the second vibrator 125 vibrates with the
vibration waveform of the phase opposite to that of the first vibrator 124, so unnecessary sound
leaks in the bone conduction mode. The ingredients can be reduced.
[0044]
The control unit 133 controls the first vibrator 124 and the second vibrator 125.
When the operation mode of sound transmission is the bone conduction mode, the control unit
133 vibrates the first vibrator 124 with an amplitude necessary for bone conduction, and the
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second vibrator 125 is vibrated as the first vibrator 124. It is driven to vibrate in the opposite
phase of. On the other hand, when the operation mode of sound transmission is the speaker
mode, the control unit 133 has twice the voltage of the first vibrator 124 and the second vibrator
125 by the BTL connection as compared to the bone conduction mode. In order to be able to
drive at the same time, both are driven in the same phase so that a loud voice can be uttered.
Further, the control unit 133 sets the phase of the vibration of the second vibrator 125 to the
vibration waveform of the first vibrator 124 depending on whether the operation mode of sound
transmission is the bone conduction mode or the speaker mode. It is controlled by switching the
switch SW101, the switch SW102, the switch SW103, and the switch SW104 whether or not the
second vibrator 125 is vibrated by inverting it. Furthermore, the control unit 133 switches the
input to the amplifier units 131A and 131B by the input switching unit (not shown) according to
the sound source. For example, when the sound source is a call voice, the control unit 133 causes
the same voice signal to be input to both of the amplifier units 131A and 131B. On the other
hand, when the sound source is stereo sound, the control unit 133 inputs the signal of the left
channel to the amplifier unit 131A, and inputs the signal of the right channel to the amplifier
unit 131B.
[0045]
FIG. 4 is a view schematically showing a cross section obtained by cutting a part of the mobile
phone terminal 100 in the speaker mode by an arrow A-A in FIG. FIG. 5 is a block diagram for
explaining the operation of the mobile phone terminal 100 in the speaker mode. In the speaker
mode, the control unit 133 switches the switch SW101 to the side where the polarity inverting
unit 132A and the first vibrator 124 are connected, opens the switch SW102, and forms a BTL
circuit for the first vibrator 124. Further, the control unit 133 switches the switch SW 103 to the
side where the amplifier unit 131 B and the second vibrator 125 are connected, and switches the
switch SW 104 to the side where the polarity inverting unit 132 B and the second vibrator 125
are connected. A BTL circuit is formed for the two transducers 125. As a result, both the first
vibrator 124 and the second vibrator 125 can be driven with a voltage twice as high as that in
the bone conduction mode, and can be driven so as to produce a loud sound. . In the speaker
mode, when the sound source is stereophonic sound, for example, the signal of the left channel is
transmitted to the first transducer 124, and the signal of the right channel is transmitted to the
second transducer 125. Audio can be played back.
[0046]
As described above, according to the first embodiment, the mobile phone terminal 100 uses the
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first vibrator 124 and the second vibrator 125 in both the bone conduction mode and the
speaker mode. Therefore, it is possible to miniaturize, reduce the weight, and reduce the cost of
the mobile phone terminal 100 that can use both of the panel speaker and the bone conduction.
In addition, since the cellular phone terminal 100 is provided with the polarity inverting portion
132B that drives the second vibrator 125 with the vibration waveform inverted with respect to
the vibration waveform of the first vibrator 124 in the bone conduction mode, bone Sound
leakage in the conduction mode can be reduced. In addition, since the first vibrator 124 and the
second vibrator 125 are disposed apart from each other, reproduction of stereo sound can be
effectively performed in the speaker mode.
[0047]
Second Embodiment FIG. 6 is a view showing a mobile phone 200 according to a second
embodiment of the present invention. Similar to the first embodiment, the mobile phone 200
according to the second embodiment is a so-called movable portion in which the first housing
210 and the second housing 220 are relatively slidable. It is a slide type mobile phone terminal.
In addition, the same code | symbol is attached | subjected to an end to the part which fulfill |
performs the function similar to 1st Embodiment mentioned above, and the overlapping
description is abbreviate | omitted suitably.
[0048]
On the surface of the first housing 210, a first operation key 211 and a microphone 212 are
provided. A display portion 221 and a second operation key 222 are provided on the surface of
the second housing 220.
[0049]
Similarly to the first embodiment, the mobile telephone terminal 200 of the second embodiment
also has two voice transmission methods of the bone conduction mode and the speaker mode.
[0050]
The cellular phone terminal 200 of the second embodiment has a first vibrator 224, a second
vibrator 225, and a third vibrator 226 inside the display section 221.
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[0051]
The first vibrator 224 is provided at a position on the upper end side away from the second
operation key 222 in the region of the display unit 221, as in the first vibrator 124 of the first
embodiment.
The first vibrator 224 is provided in close contact with the back surface side of the display
portion 221, and can vibrate the display portion 221.
The first vibrator 224 of the second embodiment vibrates in the bone conduction mode and in
the speaker mode.
[0052]
Unlike the second vibrator 125 of the first embodiment, the second vibrator 225 is disposed in
the vicinity of the first vibrator 224 in the region of the display unit 221. The second vibrator
225 is provided in close contact with the back surface side of the display portion 221, and can
vibrate the display portion 221. The second vibrator 225 of the second embodiment does not
vibrate in the speaker mode. Further, in the bone conduction mode, the second vibrator 225
vibrates with the vibration waveform of the opposite phase inverted to the vibration waveform of
the first vibrator 224.
[0053]
The third vibrator 226 is disposed at a position on the lower end side close to the second
operation key 222 in the area of the display unit 221, that is, at an isolated position apart from
the first vibrator 224. The third vibrator 226 is provided in close contact with the back surface
side of the display portion 221, and can vibrate the display portion 221. The third vibrator 226
does not vibrate in the bone conduction mode. The third vibrator 226 vibrates in the same phase
as the first vibrator 224 in the speaker mode.
[0054]
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FIG. 7 is a view schematically showing a cross section obtained by cutting a part of the mobile
phone 200 in the bone conduction mode by an arrow B-B in FIG. FIG. 8 is a block diagram for
explaining the operation of the mobile phone 200 in the bone conduction mode. The mobile
phone terminal 200 includes an amplifier unit 231A, an amplifier unit 231B, a polarity inversion
unit 232A, a polarity inversion unit 232B, and a control unit 233.
[0055]
The amplifier unit 231A is an amplifier for driving the first vibrator 224 and the second vibrator
225. The amplifier unit 231A has two amplifiers, each having an output, one directly connected
to the first transducer, and the other one via the polarity inverting unit 232A. It is connected to
the vibrator 225. In the bone conduction mode, the switch SW201 is connected to the second
vibrator 225, and when the switch SW202 is closed, an audio signal is transmitted to the first
oscillator 224, and an audio signal of opposite phase is transmitted. It is transmitted to the
second oscillator 225.
[0056]
The amplifier unit 231B is OFF in the bone conduction mode. On the other hand, in the speaker
mode described later, the amplifier unit 231B functions as an amplifier for driving the third
vibrator 226. The amplifier unit 231B also has two amplifiers.
[0057]
The polarity reversing unit 232A vibrates the second vibrator 125 so as to reduce sound leakage
by inverting the second vibrator 225 with respect to the vibration waveform of the first vibrator
224 in the bone conduction mode. It is a vibration waveform changer that Therefore, in the bone
conduction mode, the second vibrator 225 vibrates with a vibration waveform in reverse phase
to the vibration waveform of the first vibrator 224.
[0058]
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In the second embodiment, in the bone conduction mode, the second vibrator 225 vibrates with
the vibration waveform of the phase opposite to that of the first vibrator 224, so unnecessary
sound leakage in the bone conduction mode. The ingredients can be reduced. In particular, in the
second embodiment, since the second vibrator 225 is disposed in the vicinity of the first vibrator
224, a higher effect of suppressing sound leakage can be expected compared to the case of the
first embodiment.
[0059]
In addition, the polarity inverting unit 232A inverts the audio signal so that the voltage applied
to the first vibrator 224 is doubled in BTL (Bridged Tied Load or Bridged Transless or Balanced
Transformerless) connection in the speaker mode described later. And convert it into a signal of
opposite phase.
[0060]
In the bone conduction mode, the polarity reversing unit 232B does not operate because the
amplifier unit 231B is OFF, and is substantially OFF.
On the other hand, in the speaker mode to be described later, the polarity inversion unit 232B
inverts the audio signal and converts it into a signal of the opposite phase so that the voltage
applied to the third vibrator 226 is doubled in the BTL connection.
[0061]
The control unit 233 controls vibration modes of the first vibrator 224, the second vibrator 225,
and the third vibrator 226. Further, the control unit 233 switches the switch SW 201 to switch
the vibration mode of the first vibrator 224 and the second vibrator 225 depending on whether
the operation mode of sound transmission is the bone conduction mode or the speaker mode. ,
Control to switch the switch SW202. Furthermore, in the same way as the control unit 133 of the
first embodiment, the control unit 233 switches the input to the amplifier units 231A and 231B
by an input switching unit (not shown) according to the sound source. For example, when the
sound source is a call voice, the control unit 233 causes the same voice signal to be input to both
of the amplifier units 231A and 231B. On the other hand, when the sound source is stereo sound,
the control unit 233 inputs the signal of the left channel to the amplifier unit 231A, and inputs
the signal of the right channel to the amplifier unit 231B.
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[0062]
FIG. 9 is a view schematically showing a cross section obtained by cutting a part of the mobile
phone 200 in the speaker mode by an arrow B-B in FIG. FIG. 10 is a block diagram for explaining
the operation of the mobile phone 200 in the speaker mode. In the speaker mode, the control
unit 233 switches the switch SW201 to the speaker mode side, disconnects the second vibrator,
connects the first vibrator, and opens the switch SW202. As a result, the drive signal is not
transmitted to the second vibrator 225, and the vibration is stopped. On the other hand, the
polarity inverting unit 232A inverts the audio signal and converts it into a signal of the opposite
phase so that the voltage applied to the first vibrator 224 is doubled. The first vibrator 224 is in
a state of being BTL connected similarly to the third vibrator 226, whereby the display unit 221
functions as a diaphragm of the speaker.
[0063]
Further, in the speaker mode, both the amplifier unit 231B and the polarity inverting unit 232B
operate. Since the third vibrator 226 is BTL connected, the polarity inverting unit 232B inverts
the audio signal so that the voltage applied to the third vibrator 226 is doubled to a signal in
reverse phase. Convert. Further, in the speaker mode, when the sound source is stereo sound, for
example, the signal of the left channel is transmitted to the first transducer 224, and the signal of
the right channel is transmitted to the third transducer 226. Audio can be played back.
[0064]
As described above, in the second embodiment, in the bone conduction mode, the polarity
reversing unit 232A that vibrates the second vibrator 225 with a vibration waveform obtained by
reversing the vibration waveform of the first vibrator 224. Since it is provided, it is possible to
reduce the sound leakage in the bone conduction mode. Further, since the second vibrator 225 is
disposed in the vicinity of the first vibrator 224, the effect of suppressing sound leakage in the
bone conduction mode can be further enhanced. Furthermore, the third vibrator 226 is provided
at a position away from the first vibrator 224, and in the speaker mode, the third vibrator 226 is
vibrated without vibrating the second vibrator 225. Sometimes stereo sound can be played back
effectively.
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[0065]
The processing of the portable telephone terminal is recorded in a computer readable recording
medium, and the program recorded in the recording medium is read into the control unit
(computer) of the portable telephone terminal and executed thereby. A voice transmission
method of a mobile phone terminal and a voice transmission program of a mobile phone terminal
can be realized. The computer referred to here includes hardware such as an OS and peripheral
devices.
[0066]
In addition, the “computer” also includes a homepage providing environment (or display
environment) if the WWW (World Wide Web) system is used. Also, the program may be
transmitted from a computer in which the program is stored in a storage device or the like, to
another computer via a transmission medium or by transmission waves in the transmission
medium. Here, the “transmission medium” for transmitting the program is a medium having a
function of transmitting information, such as a network (communication network) such as the
Internet or a communication line (communication line) such as a telephone line.
[0067]
Further, the program may be for realizing a part of the functions described above. Furthermore,
it may be a so-called difference file (difference program) that can realize the above-described
functions in combination with a program already recorded in the computer.
[0068]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to this embodiment, and includes design
and the like within the scope of the present invention.
[0069]
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(Modified Form) For example, in each embodiment, the vibration waveform of the second
vibrator has been described with an example in which the vibration waveform of the first
vibrator is inverted in the bone conduction mode.
The present invention is not limited to this, and the phase of the vibration waveform of the
second vibrator may be shifted.
[0070]
The first embodiment, the second embodiment, and the modified embodiment can be used in
combination as appropriate, but the detailed description will be omitted.
[0071]
DESCRIPTION OF SYMBOLS 100, 200 Mobile telephone terminal 110, 210 1st housing | casing
111, 211 1st operation key 112, 212 Microphone 120, 220 2nd housing | casing 121, 221
Display part 122, 222 2nd operation key 124, 224 1st vibrator 125, 225 2nd vibrator 131A,
131B, 231A, 231B Amplifier part 132A, 132B, 232A, 232B Polarity inversion part 133, 233
Control part 226 3rd vibrator SW101, SW102, SW103, SW104 , SW201, SW202 switch
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