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JP2010010727

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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 JP2010010727
The present invention provides a small speaker device capable of sufficiently emitting sound due
to a frequency component of a bass range even when the size is reduced while suppressing an
increase in the number of parts and suppressing complication of a circuit configuration. Do. The
small-sized speaker device 1 is attached to a speaker box 10, a speaker unit 20 attached to the
speaker box 10, and the speaker box 10. The small speaker device 1 resonates with the vibration
of the speaker unit 20 and vibrates to thereby drive a drive system. A passive radiator 30 is
provided, and a bass enhancement circuit 60 for enhancing the sound pressure in the bass
frequency component of one input audio signal. [Selected figure] Figure 4
Small speaker device and television device
[0001]
The present invention relates to a small speaker device and a television device, and more
particularly to a small speaker device and a television device provided with a passive radiator.
[0002]
Conventionally, a speaker device and a television device provided with a passive radiator are
known (see, for example, Patent Documents 1 to 3).
[0003]
Patent Document 1 discloses a passive speaker having a main speaker (speaker), a voice coil as a
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driving system, a main amplifier (amplifying circuit) connected to the main speaker, and a main
amplifier connected to the main amplifier. A speaker system is disclosed that includes a mixing
amplifier for mixing the signal of the signal of the subwoofer and the signal for the subwoofer,
and a motional feedback circuit connected to the passive radiator for enhancing the sound
pressure in the low frequency range frequency component.
This speaker system mixes the signal for the center speaker and the signal for the subwoofer to
enhance the sound pressure in the mid-range frequency component and the low-range frequency
component of the signal applied to the main speaker. Become.
Thereby, the sound emitted from the main speaker is configured such that the sound due to the
frequency components in the middle range and the low range is intensified. In addition, the
motional feedback circuit connected to the passive radiator is configured such that the sound
generated from the passive radiator in resonance with the main speaker is further enhanced in
the sound pressure in the frequency component of the bass range.
[0004]
Further, in the above-mentioned Patent Document 2, a cabinet (casing), a speaker unit (speaker)
attached to the cabinet, a passive radiator attached on the same surface as the speaker unit
(speaker), and a coaxial radiator as the passive radiator A loudspeaker system is disclosed,
comprising a bass reflex duct connected in such a way that the bass reflex duct is arranged inside
the cabinet. The bass reflex duct of this speaker device is configured to vibrate in accordance
with the vibration of the passive radiator by having one end connected to the opening on the
small diameter side of the passive radiator. As a result, the speaker device is configured to
improve the acoustic characteristic in the low-pitch range by providing the effect as the passive
radiator type speaker device and the effect as the bass reflex type speaker device.
[0005]
Further, in Patent Document 3 described above, an enclosure (casing) divided into two so as to be
fitted to each other, a speaker unit (speaker) disposed inside the enclosure, and a speaker unit in
front of the speaker unit And a passive radiator arranged to face in the same direction.
[0006]
JP-A-11-150787 JP-A-2005-260625 JP-A-9-70091
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[0007]
However, in the speaker system described in Patent Document 1 described above, two signals of
a signal for the center speaker and a signal for the subwoofer are necessary in order to enhance
sound due to the frequency components in the middle range and the low range.
For this reason, there is a problem that the circuit configuration becomes complicated as
compared with the case of inputting one signal in order to input two signals to the mixing
amplifier.
In addition, it is necessary to provide a motional feedback circuit in the passive radiator in order
to enhance the sound due to the frequency components in the low frequency range, which
further complicates the circuit configuration. In addition, in order to reflect feedback from the
motional feedback circuit on the passive radiator, it is necessary to provide a voice coil or the like
as a drive system in the passive radiator, which causes a problem that the number of parts
increases.
[0008]
Further, in the speaker device described in Patent Document 2 mentioned above, since a member
for enhancing the sound pressure in the frequency component of the low frequency band in the
speaker unit is not provided, in the frequency component of the low frequency band emitted by
the speaker unit itself. There is a disadvantage that the sound pressure is reduced. For this
reason, the sound pressure in the frequency component of the low frequency band also
decreases in the passive radiator and the bass reflex duct that resonates and vibrates in the
speaker unit, so that the sound due to the frequency component of the low frequency band is not
sufficiently emitted It is thought that there is a problem.
[0009]
Further, in the speaker device described in Patent Document 3, only the passive radiator is
provided, and therefore, there is a problem that when the size is reduced, the sound due to the
frequency component of the bass range is not sufficiently emitted.
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[0010]
The present invention has been made to solve the problems as described above, and one object of
the present invention is to suppress an increase in the number of parts and to reduce the size of
the circuit while suppressing the complication of the circuit configuration. It is an object of the
present invention to provide a small speaker device capable of sufficiently emitting a sound due
to a frequency component of a low frequency range even when being used.
Means for Solving the Problems and Effects of the Invention
[0011]
A small speaker device according to a first aspect of the present invention includes a housing, a
speaker attached to the housing, and a passive radiator attached to the housing and vibrating in
resonance with the vibration of the speaker and having no drive system. And a bass enhancement
circuit for enhancing the sound pressure in the bass frequency component of one input audio
signal.
[0012]
In the small speaker device according to the first aspect, as described above, the bass region is
enhanced by providing the passive radiator and the bass region enhancement circuit for
enhancing the sound pressure in the frequency component of the bass region of the audio signal.
The speaker vibrates to emit sound in a state where the bass range is enhanced in the circuit, and
the passive radiator vibrates to emit sound by resonating with the vibration of the speaker.
As a result, since the sound emitted from the speaker in which the bass range is enhanced and
the sound in which the bass range emitted from the passive radiator resonating with the
vibration in which the bass range of the speaker is enhanced are combined, the case of
downsizing Also, it is possible to sufficiently emit the sound by the frequency component of the
low frequency range.
In addition, in order to enhance the sound pressure in the frequency components of the bass
region, only one audio signal needs to be input to the bass region enhancement circuit, and
therefore, compared to the case where two audio signals are input to the bass region
enhancement circuit. The circuit configuration can be simplified.
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Further, the circuit configuration can be simplified because it is not necessary to provide a
motional feedback circuit in the passive radiator in order to enhance the sound due to the
frequency component in the low frequency range. Moreover, since the passive radiator of the
present invention does not have a drive system such as a voice coil, an increase in the number of
parts can be suppressed.
[0013]
In the small speaker device according to the first aspect, preferably, the bass range enhancement
circuit includes a sound pressure at a frequency near 70 Hz which is a bass region emitted from
the small speaker device body and a sound pressure at a frequency near 1 kHz It is comprised so
that it may strengthen so that it may become substantially identical. With this configuration, it is
possible to enhance the sound pressure at a frequency near 70 Hz, which is a bass range, to a
level substantially equal to the sound pressure at a frequency near 1 kHz, which is a standard
frequency.
[0014]
In the small speaker device according to the first aspect, preferably, the passive radiator having
no drive system is a cone that resonates and vibrates with the vibration of the speaker, and a
weight supported by the cone for adjusting the weight of the cone. In a passive radiator including
a drive system and having no drive system, the weight of the cone is adjusted by the weight such
that the cone resonates at a frequency near 50 Hz when attached to the housing. According to
this configuration, the passive radiator having no drive system resonates in the vicinity of 50 Hz,
which is the low frequency range, and causes the passive radiator to resonate with the vibration
of the speaker and vibrate in the high frequency range larger than 50 Hz. it can. As a result, since
the sound emitted from the speaker and the sound emitted from the passive radiator are
combined in the bass region larger than around 50 Hz, the small speaker device can also
generate the sound due to the frequency component of the bass region. Can emit enough.
[0015]
In the small speaker device according to the first aspect, preferably, an automatic gain control
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circuit for outputting an audio signal input to a bass enhancement circuit and keeping an output
to the bass enhancement circuit substantially constant, a bass enhancement circuit And an
amplifier circuit for amplifying an audio signal output from the amplifier. According to this
configuration, the bass range enhancement circuit enhances the sound pressure in the bass range
frequency component of the output signal (audio signal) adjusted to be substantially constant by
the automatic gain control circuit. Can be suppressed.
[0016]
In the small speaker device according to the first aspect, preferably, the housing has a volume of
400 cm <3> or more and 1000 cm <3> or less. With such a configuration, even if it is a small
speaker device having only a small volume such as 400 cm <3> or more and 1000 cm <3> or
less, the speaker device having the configuration of the present invention can Sound with
frequency components can be emitted sufficiently.
[0017]
A flat television device according to a second aspect of the present invention is a passive radiator
that is attached to a housing, a speaker attached to the housing, and a housing, resonates and
vibrates with the vibration of the speaker, and does not have a drive system. And a low-pitched
sound enhancement circuit for enhancing the sound pressure of low-pitched frequency
components of one input audio signal.
[0018]
In the flat panel television according to the second aspect, as described above, the bass range is
provided by including the passive radiator and the bass enhancement circuit for enhancing the
sound pressure in the bass component of the voice signal. The speaker vibrates to emit a sound
in a state where the low range is enhanced in the intensifying circuit, and the passive radiator
vibrates to emit a sound by resonating with the vibration of the speaker.
As a result, since the sound emitted from the speaker in which the bass range is enhanced and
the sound in which the bass range emitted from the passive radiator resonating with the
vibration in which the bass range of the speaker is enhanced are combined, the case of
downsizing Also, it is possible to sufficiently emit the sound by the frequency component of the
low frequency range. In addition, only one audio signal needs to be input to the bass
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enhancement circuit in order to enhance the sound pressure in the frequency component of the
bass region, so compared to the case where two audio signals are input to the bass enhancement
circuit. The circuit configuration can be simplified. Further, the circuit configuration can be
simplified because it is not necessary to provide a motional feedback circuit in the passive
radiator in order to enhance the sound due to the frequency component in the low frequency
range. Moreover, since the passive radiator of the present invention does not have a drive system
such as a voice coil, an increase in the number of parts can be suppressed.
[0019]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
[0020]
FIG. 1 is a perspective view of a flat panel television according to an embodiment of the present
invention.
FIG. 2 is a perspective view showing a small speaker device of the flat panel television according
to the embodiment of the present invention shown in FIG. 3 to 5 show the details of the compact
speaker apparatus according to the embodiment of the present invention shown in FIG. First,
with reference to FIGS. 1 to 5, the configurations of a flat-screen television apparatus 100 and a
small speaker apparatus 1 according to an embodiment of the present invention will be
described.
[0021]
As shown in FIG. 1, the flat television device 100 according to the embodiment of the present
invention is disposed on the television case 2 and the face (front face 2a) of the television case 2
on the arrow Y1 direction side, and an image is displayed. A pair of small speaker devices
provided on both sides of the image display unit 3, the leg unit 4 supporting the television case
2, and the arrow X direction of the image display unit 3 and disposed inside the television case 2
And 1. Further, the pair of small speaker devices 1 is provided on the front surface 2 a of the
television case 2 so that the surface (front surface 10 a) on the arrow Y 1 direction side of the
speaker box 10 described later of the small speaker device 1 is disposed.
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[0022]
Further, as shown in FIG. 2 and FIG. 3, the small speaker device 1 is composed of a resin speaker
box 10, a speaker unit 20, a passive radiator 30, and a main amplifier 40 (see FIG. 3). . The
speaker box 10 is an example of the casing in the present invention, and the speaker unit 20
is an example of the speaker in the present invention.
[0023]
Here, in the present embodiment, the speaker box 10 is formed in a box shape. Further, holes 10
b and 10 c for attaching the speaker unit 20 and the passive radiator 30 are provided on the
front surface 10 a of the speaker box 10. Further, as shown in FIG. 2, the speaker box 10 has a
width (L1) of about 80 mm, a depth (L2) of about 50 mm, and a height (L3) of about 150 mm,
and has a so-called rectangular shape. Have. Further, as shown in FIG. 3, the speaker box 10 has
a thickness (t) of about 4 mm. As a result, the volume of the speaker box 10 is about 500 cm <3>.
[0024]
Further, as shown in FIGS. 2 and 3, the speaker unit 20 and the passive radiator 30 are attached
to the front surface 10 a of the speaker box 10, and the passive radiator 30 is disposed below the
speaker unit 20. Further, as shown in FIG. 3, the speaker unit 20 is connected to the main
amplifier 40 from the back surface 10 d (surface on the arrow Y2 direction side) side of the
speaker box 10.
[0025]
Further, the speaker unit 20 is configured to be able to reproduce the full range, and is
configured to have a resonant frequency of about 130 Hz. Specifically, as shown in FIG. 5, the
sound pressure of the speaker unit 20 decreases as the frequency decreases at a frequency lower
than about 130 Hz, which is the resonance frequency. Further, as shown in FIGS. 2 and 3, the
speaker unit 20 is configured to have an aperture (D1) with a diameter of about 50 mm. The
speaker unit 20 has a rated input of 15 W (watt), and is configured to be compatible with an
audio signal with a large voltage input from the main amplifier 40 (see FIG. 3).
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[0026]
Further, as shown in FIG. 3, the passive radiator 30 is provided with the cone paper 31 attached
to the front surface 10 a of the speaker box 10. The cone paper 31 has a large diameter portion
31a on the front surface 10a side (arrow Y1 direction side) of the speaker box 10 and a small
diameter portion 31b on the back surface 10d side (arrow Y2 direction side) of the speaker box
10 The inner diameter is configured to decrease as going from the front surface 10a of 10 to the
inside direction of the speaker box 10 (arrow Y2 direction). The corn paper 31 is an example of
the "corn" in the present invention. The cone paper 31 of the passive radiator 30 is configured to
vibrate in resonance with the vibration of the speaker unit 20.
[0027]
Further, in the passive radiator 30, a bobbin 32 attached to the small diameter portion 31b, a
weight 33 bonded to the bobbin 32, and a damper whose one end is fixed to the attachment
portion of the cone paper 31 and the bobbin 32 34 and a frame 35 to which the other end of the
damper 34 is fixed. Further, the bobbin 32 and the weight 33 are configured to be able to vibrate
with the vibration of the cone paper 31. Further, the damper 34 has a function of damping
vibration of the cone paper 31 and the bobbin 32 and the weight 33 attached to the cone paper
31. Further, as shown in FIGS. 2 and 3, the passive radiator 30 is configured to have the same
diameter (D 1) of about 50 mm in diameter as the speaker unit 20. Further, as shown in FIG. 3,
the passive radiator 30 is not provided with a drive system for electrically vibrating the cone
paper 31 such as a permanent magnet and a voice coil.
[0028]
Here, in the present embodiment, the weight 33 is adjusted so that the cone paper 31 of the
passive radiator 30 resonates at a frequency of about 50 Hz in a state where the passive radiator
30 is attached to the speaker box 10 It is configured to be possible. That is, if the resonance
frequency of the cone paper 31 is smaller than 50 Hz, the weight 33 is changed to a smaller
weight, and if the resonance frequency of the cone paper 31 is larger than 50 Hz, the weight 33
is changed to a larger weight. Thus, the weight 33 is adjusted such that the cone paper 31
resonates at a frequency of about 50 Hz. Further, as shown in FIG. 5, in the passive radiator 30,
the sound pressure is maximized in the vicinity of 50 Hz which is the resonance frequency.
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[0029]
Further, as shown in FIG. 4, the main amplifier 40 is composed of an AGC (Automatic Gain
Control) circuit 50, a bass region intensifying circuit 60, and a power amplifier 70. Also, the main
amplifier 40 and the bass range enhancing circuit 60 provided inside the main amplifier 40 are
configured to enhance one input audio signal, and the audio signal input to the main amplifier 40
is firstly The AGC circuit 50 keeps the output substantially constant regardless of the input audio
signal. Then, the audio signal output from the AGC circuit 50 is input to a bass range
enhancement circuit 60 that enhances frequency components in the bass range. At this time, the
output of the AGC circuit 50 to the bass range enhancing circuit 60 is kept substantially
constant. Further, the audio signal output from the bass range enhancing circuit 60 is input to a
power amplifier 70 for amplifying the audio signal. The audio signal output from the power
amplifier 70 is configured to be input to the speaker unit 20. Here, in the present application (the
present invention), the bass range refers to a range of frequencies of about 100 Hz or less.
[0030]
Specifically, the AGC circuit 50 includes resistors 51a to 51h, capacitors 52a to 52e, an
operational amplifier 53 for amplifying an audio signal, a power supply 54 for operating the
operational amplifier 53, and a rectifier for rectifying the audio signal. And a bipolar transistor
56. The AGC circuit 50 is an example of the "automatic gain control circuit" in the present
invention. Further, the bass range enhancing circuit 60 includes resistors 61a to 61f, capacitors
62a to 62d, an operational amplifier 63 for amplifying an audio signal, and a power supply 64
for operating the operational amplifier 63. The power amplifier 70 includes resistors 71a and
71b, capacitors 72a and 72b, an operational amplifier 73 for amplifying an audio signal, and a
power supply 74 for operating the operational amplifier 73. The power amplifier 70 is an
example of the amplifying circuit in the present invention.
[0031]
Further, the AGC circuit 50 is configured mainly by the diode 55 and the bipolar transistor 56 so
as to keep the output from the AGC circuit 50 substantially constant. Further, the AGC circuit 50
is configured to output the audio signal to the bass region enhancement circuit 60 after
removing a direct current component of the audio signal output from the operational amplifier
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53 in the capacitor 52 e. In the power amplifier 70, the audio signal input from the bass region
enhancement circuit 60 is enhanced by the operational amplifier 73, and the DC component of
the audio signal output from the operational amplifier 73 is removed by the capacitor 72b. It is
configured to be output.
[0032]
Further, in the bass range enhancing circuit 60, one electrode of the capacitor 52e of the AGC
circuit 50 is connected to one end of the resistor 61a. The other end of the resistor 61a is
connected to one end of each of the resistor 61b and the resistor 61d and one electrode of the
capacitor 62a. The other electrode of the capacitor 62 a is connected to one end of the resistor
61 c and one input terminal of the operational amplifier 63. The output terminal of the
operational amplifier 63 is connected to the other end of the resistor 61c, one electrode of the
capacitor 62b, and one electrode of the capacitor 62d. The other electrode of the capacitor 62b
is connected to the other end of the resistor 61b.
[0033]
Here, in the present embodiment, the bass range enhancing circuit unit 60a is configured by the
resistor 61b, the resistor 61c, and the capacitor 62b. That is, in the audio signal output from the
operational amplifier 63, the high frequency range frequency component is attenuated by the
resistor 61c and the capacitor 62b. As a result, only the frequency component of the bass region
of the audio signal is fed back to the input side of the operational amplifier 63, so that only the
audio signal of the bass region is amplified for the audio signal input to the bass region
enhancement circuit 60. It is configured to be output from the intensifying circuit 60.
[0034]
Further, in the bass region enhancement circuit 60, the other input terminal of the operational
amplifier 63 alternates one end of the resistors 61e and 61f for operating the operational
amplifier 63 with a bias point (a connection point of the resistor 61e and the resistor 61f) It is
connected to one electrode of a capacitor 62c for grounding. The other end of the resistor 61 f is
connected to the positive electrode of the power supply 64 and one power supply terminal of the
operational amplifier 63.
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[0035]
Further, in the bass region enhancement circuit 60, the other end of the resistor 61d, the other
end of the resistor 61e, the other electrode of the capacitor 62c, the other power supply terminal
of the operational amplifier 63, and the negative electrode of the power supply 64 are grounded.
. Further, the capacitor 62 d of the bass range enhancement circuit 60 is configured to remove a
DC component of the audio signal output from the bass range enhancement circuit 60, and the
other electrode is one input terminal of the operational amplifier 73 of the power amplifier 70. It
is connected to the.
[0036]
Further, in the present embodiment, as shown in FIG. 5, the sound pressure characteristic in the
frequency component of 50 Hz or more and 100 Hz or less output from the main amplifier 40 is
enhanced, and is maximized in the vicinity of 70 Hz. It is adjusted to be enhanced. Further, the
sound pressure characteristic at 70 Hz output from the main amplifier 40 is adjusted to be
enhanced by about 10 dB than the sound pressure characteristic at 1 kHz which is a standard
frequency. The enhancement in the low frequency range frequency component is due to the
enhancement of the low frequency range by the low frequency range enhancement circuit 60.
Thereby, in the bass range enhancement circuit 60, the sound pressure at a frequency near 70
Hz which is a bass range emitted from the main body of the small speaker device 1 and the
sound pressure at a frequency near 1 kHz which is a midrange are substantially the same. Will be
configured to enhance.
[0037]
In the present embodiment, as described above, the passive radiator 30 is provided, and the bass
region enhancement circuit 60 for enhancing the sound pressure in the frequency component of
the bass region of the audio signal output from the AGC circuit 50 is provided. The speaker unit
20 vibrates to emit a sound in a state where the bass region is enhanced in the bass region
enhancement circuit 60, and resonates with the vibration of the speaker unit 20 to vibrate the
passive radiator 30 to emit a sound. As a result, the sound emitted from the speaker unit 20 in
which the bass range is enhanced and the sound in which the bass range emitted from the
passive radiator 30 resonates with the vibration in which the bass region of the speaker unit 20
is enhanced are combined. Even when miniaturized, it is possible to sufficiently emit sound by
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frequency components in the low frequency range. Further, only one audio signal output from
the AGC circuit 50 needs to be input to the bass region enhancement circuit 60 in order to
enhance the sound pressure in the frequency component of the bass region, so that two audio
signals are bass region enhancement circuits The circuit configuration can be simplified as
compared to the case where the signal is input to 60. Further, since it is not necessary to provide
a motional feedback circuit in the passive radiator 30 in order to enhance the sound due to the
frequency component in the low frequency range, the circuit configuration can be simplified.
Moreover, since the passive radiator 30 does not have a drive system such as a voice coil, an
increase in the number of parts can be suppressed.
[0038]
Further, in the present embodiment, as described above, the sound pressure at a frequency near
70 Hz, which is the low sound range emitted from the main body of the small speaker device 1,
and the sound pressure at a frequency near 1 kHz The sound pressure in the vicinity of 70 Hz,
which is a bass range, is enhanced to a level substantially equal to the sound pressure at a
frequency near 1 kHz which is a standard frequency by configuring so as to be substantially the
same. it can.
[0039]
Further, in the present embodiment, as described above, the cone paper 31 is made to be
resonant by the weight 33 so that the cone paper 31 resonates at a frequency near 50 Hz in a
state where the passive radiator 30 having no drive system is attached to the speaker box 10 The
passive radiator 30 having no drive system resonates in the vicinity of 50 Hz, which is a low
frequency range, by adjusting the weight of the speaker 31, so that the passive radiator 30 can
be used as the speaker unit 20 in a high frequency range larger than 50 Hz. Can be made to
resonate to the vibration of.
As a result, the sound emitted from the speaker unit 20 and the sound emitted from the passive
radiator 30 are combined in the low frequency range larger than the vicinity of 50 Hz, so that the
small speaker device 1 also has the frequency in the low frequency range. The sound by the
component can be emitted sufficiently.
[0040]
Further, in the present embodiment, as described above, the AGC circuit 50 that outputs the
audio signal input to the bass range enhancement circuit 60, the power amplifier 70 to which the
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audio signal output from the bass range enhancement circuit 60 is input, By providing the main
amplifier 40 with the main amplifier 40, the bass range enhancer 60 enhances the frequency
component in the bass range of the output signal (audio signal) adjusted to be substantially
constant by the AGC circuit 50. Can be suppressed.
[0041]
Further, in the present embodiment, as described above, by configuring the speaker box 10 to
have a volume of about 500 cm <3>, it has only a small volume such as about 500 cm <3>. Even
with the small-sized speaker device 1, it is possible to sufficiently emit the sound due to the
frequency component of the low tone range.
[0042]
FIG. 6 is a perspective view showing a speaker apparatus according to a comparative example
corresponding to a conventional type of a small speaker apparatus according to an embodiment
of the present invention.
7 and 8 are diagrams showing sound pressure frequency characteristics.
Next, measurement of sound pressure frequency characteristics performed to confirm the effects
of the embodiment of the present invention described above will be described with reference to
FIGS. 2, 4 and 6 to 8.
[0043]
The measurement of the sound pressure frequency characteristics was performed for the small
speaker device 1 according to the embodiment of the present invention shown in FIG. 2 and the
speaker device 8 according to the comparative example shown in FIG. Specifically, measuring
devices (not shown) are installed in front of the small speaker device 1 according to the present
embodiment and the speaker device 8 according to the comparative example, and the same audio
signal is used for the small speaker device 1 according to the present embodiment and the
speaker according to the comparative example Each measurement was performed by inputting
into the device 8.
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[0044]
Further, as shown in FIG. 6, the speaker device 8 according to the comparative example is
configured of a resin speaker box 80, a speaker unit 20, and a main amplifier (not shown).
Further, unlike the small speaker device 1 (see FIG. 2) according to the present embodiment, the
passive radiator 30 (see FIG. 2) is not provided in the speaker device 8 according to the
comparative example. For this reason, in the front surface 80a of the speaker box 80, the hole
10c (see FIG. 2) to which the passive radiator 30 is attached is not provided. That is, the speaker
device 8 according to the comparative example is a so-called closed speaker device having no
passive radiator. Further, unlike the small-sized speaker device 1 according to the present
embodiment, the low-frequency range enhancing circuit 60 (see FIG. 4) is not provided in the
main amplifier (not shown) of the speaker device 8 according to the comparative example. The
other configuration of the speaker device 8 according to the comparative example is the same as
the small speaker device 1 according to the present embodiment.
[0045]
With respect to the small speaker device 1 according to the present embodiment and the speaker
device 8 according to the comparative example described above, the output changes as the
frequency components of the small speaker device 1 according to the present embodiment and
the speaker device 8 according to the comparative example change. 7 and 8 show the results of
measurement of the situation of
[0046]
In FIG. 7 and FIG. 8, the vertical axis represents output (dB) and the horizontal axis represents
frequency (Hz).
As shown in FIG. 7, in the small-sized speaker device 1 according to the present embodiment, an
output of about −10 dB was obtained at 60 Hz (point A in FIG. 7) which is a low frequency
range. Also, an output of about -10 dB was obtained at 1 kZ (point B in FIG. 7), which is a midrange frequency. As a result, the sound pressure at 60 Hz, which is the low frequency band, and
the sound pressure at 1 kZ, which is the frequency of the middle band, are substantially the
same. Therefore, the small speaker device 1 according to the present embodiment uses the
frequency components of the middle band. It has been confirmed that it is possible to emit a
sound by the frequency component in the low frequency range to approximately the same level
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as the sound.
[0047]
On the other hand, as shown in FIG. 8, in the speaker device 8 according to the comparative
example, an output of about -32 dB was obtained at 60 Hz (point C in FIG. 8) which is a low
frequency range. Also, an output of about -15 dB was obtained at 1 kZ (point D in FIG. 8), which
is a mid-range frequency. As a result, the sound pressure at 60 Hz, which is the low frequency
band, is approximately 17 dB smaller than the sound pressure at 1 kZ, which is the frequency of
the middle frequency band. It has been confirmed that the sound can not be emitted due to the
frequency component of the low frequency band to about the same extent as the above.
[0048]
From these results, the small speaker device 1 according to the present embodiment has the
midrange by including the passive radiator 30 and the bass enhancement circuit 60 for
enhancing the sound pressure in the frequency component of the bass of the audio signal. Since
it was possible to emit the sound due to the frequency component of the bass region to
approximately the same level as the sound due to the frequency component of the above, it was
confirmed that the sound due to the frequency component of the bass region could be
sufficiently emitted.
[0049]
It should be understood that the embodiments disclosed herein are illustrative and nonrestrictive in every respect.
The scope of the present invention is indicated not by the description of the embodiments
described above but by the claims, and further includes all modifications within the meaning and
scope equivalent to the claims.
[0050]
Although the sound pressure characteristic output from the main amplifier is adjusted to be
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maximally enhanced at 70 Hz in the above embodiment, the present invention is not limited to
this, and the frequency at which the sound pressure characteristic is maximally enhanced Is not
limited to 70 Hz, and may be an adjustable frequency. For example, the frequency may be
smaller than 70 Hz, such as around 60 Hz, if adjustable.
[0051]
In the above embodiment, the sound pressure characteristic output from the main amplifier at 70
Hz is adjusted by about 10 dB more than the sound pressure characteristic at 1 kHz. However,
the present invention is not limited to this, and low The sound pressure characteristics at 70 Hz
may be adjusted to a value of about 10 dB or more higher than the sound pressure
characteristics at 1 kHz, as long as the sound pressure at frequency components in the sound
range can be enhanced. It may be adjusted to enhance.
[0052]
In the above embodiment, the small speaker device is provided on both sides of the image display
unit of the thin television device. However, the present invention is not limited to this, and the
small speaker device may be a thin television device. It is not limited to providing on both sides
of the image display unit.
For example, as shown in the first modified example of FIG. 9, even if the pair of small speaker
devices 1 is disposed inside the television casing 2 below (the leg side) the image display unit 3
of the thin television device 100a. Good.
[0053]
In the above embodiment, although an example in which a pair of small speaker devices is
provided in a thin television device has been described, the present invention is not limited
thereto, and one or more small speaker devices may be used as a thin television device. You may
provide.
[0054]
In the above embodiment, the speaker unit and the passive radiator are provided on the front
surface (the surface on the arrow Y1 direction side in FIG. 2) of the speaker box of the small
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speaker device, but the present invention is not limited thereto. It is not restricted to providing a
speaker unit and a passive radiator in the front of a speaker box.
For example, one of the speaker unit and the passive radiator may be provided on the front of the
speaker box, and the other of the speaker unit and the passive radiator may be provided on the
back of the speaker box (the surface on the arrow Y2 direction side in FIG. 2).
[0055]
Further, in the above embodiment, the speaker box of the small speaker device of the flat
television device has a width (L1) of about 80 mm, a depth (L2) of about 50 mm, and a height
(L3) of about 150 mm. The present invention is not limited thereto, and the shape of the speaker
box is not particularly limited as long as the volume of the speaker box is about 400 cm <3> or
more and about 1000 cm <3> or less. . For example, as in the second modified example of FIGS.
10 and 11, the speaker box 19a of the small speaker device 9a of the flat-screen television 200
has a width, depth, and height of about 85 mm (L4 in FIG. 11). ), And may be configured to have
a so-called cubic shape. In this case, as shown in FIG. 11, the speaker unit 20 and the passive
radiator 30 are respectively provided on the front and rear surfaces (the surface on the arrow Y1
direction side and the surface on the arrow Y2 direction side). Further, as shown in the third
modification of FIG. 12, the speaker box 19b of the small speaker device 9b is configured to have
a size (L4) of about 85 mm in width, depth and height, and to be small in size. The speaker unit
20 and the passive radiator 30 may be provided on the front surface (the surface on the arrow
Y1 direction side) and the top surface (the surface on the arrow Z2 direction side) of the speaker
box 19b of the device 9b. Here, each surface of the speaker boxes 19a and 19b in the second and
third modifications has the size of the aperture of the speaker unit 20 and the passive radiator
30 so that the speaker unit 20 and the passive radiator 30 can be attached. It is necessary to be
larger than (D1: about 50 mm in diameter).
[0056]
In the above embodiment, the volume of the speaker box of the small speaker device is set to
about 500 cm <3>. However, the present invention is not limited to this and may be configured
to have a smaller volume. . Specifically, by configuring the speaker box to have a width (L1) of
about 75 mm, a depth (L2) of about 47 mm, and a height (L3) of about 140 mm, the volume is
about 400 cm < It may be 3>. Also, the speaker box may be configured to have a volume smaller
than about 400 cm <3>.
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[0057]
In the above embodiment, the volume of the speaker box of the small speaker device is set to
about 500 cm <3>. However, the present invention is not limited to this and may be configured
to have a larger volume. . Specifically, by configuring the speaker box to have a width (L1) of
about 100 mm, a depth (L2) of about 60 mm, and a height (L3) of about 190 mm, the volume is
about 1000 cm < It may be 3>. Also, the speaker box may be configured to have a volume larger
than about 1000 cm <3>, but is preferably 1000 cm <3> or less.
[0058]
In the above embodiment, the speaker unit and the passive radiator are configured to have a
diameter (D1) of about 50 mm in diameter, but the present invention is not limited thereto. , And
may be configured to have an aperture larger than 50 mm in diameter, or may be configured to
have an aperture smaller than 50 mm in diameter if sufficient sound can be emitted from the
frequency component of the bass range. .
[0059]
In the above embodiment, an example is shown based on the sound pressure characteristic at 1
kHz output from the main amplifier. However, the present invention is not limited to this, and the
sound pressure characteristic at another frequency instead of the sound pressure characteristic
at 1 kHz. It may be based on
[0060]
In the above embodiment, the AGC circuit, the bass enhancement circuit and the power amplifier
of the main amplifier are configured by analog circuits such as resistors and bipolar transistors.
However, the present invention is not limited to this and digital circuits may be used. It may be
configured.
[0061]
FIG. 1 is a perspective view of a flat panel television according to an embodiment of the present
invention;
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It is the perspective view which showed the small speaker apparatus of the flat-panel television
apparatus by one Embodiment of this invention shown in FIG.
It is the figure which showed the structure of the small speaker apparatus by one Embodiment of
this invention shown in FIG.
It is the figure which showed the circuit structure of the main amplifier of the small speaker
apparatus by one Embodiment of this invention shown in FIG. It is the figure which showed the
sound pressure frequency characteristic of the speaker unit of the small speaker apparatus by
one Embodiment of this invention shown in FIG. 2, and a passive radiator, and the amplification
factor of the main amplifier. It is the perspective view which showed the speaker apparatus
corresponding to the conventional type which is a comparative example of the small speaker
apparatus by one Embodiment of this invention. It is the figure which showed the sound pressure
frequency characteristic of the small speaker apparatus by one Embodiment of this invention
shown in FIG. It is the figure which showed the sound pressure frequency characteristic of the
speaker apparatus corresponding to the conventional type which is a comparative example of the
small speaker apparatus by one Embodiment of this invention. It is a perspective view for
demonstrating the thin-shaped television apparatus by the 1st modification of one Embodiment
of this invention. It is a perspective view for demonstrating the thin-shaped television apparatus
by the 2nd modification of one Embodiment of this invention. It is a perspective view for
demonstrating the small speaker apparatus by the 2nd modification of one Embodiment of this
invention. It is a perspective view for demonstrating the small speaker apparatus by the 3rd
modification of one Embodiment of this invention.
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1 small speaker apparatus 10 speaker box (casing) 20 speaker unit
(speaker) 30 passive radiator 31 cone paper (cone) 33 weight 50 AGC circuit (automatic gain
control circuit) 60 bass region enhancement circuit 70 power amplifier (amplifier circuit) 100
Flat-panel television
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