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JP2007110427

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DESCRIPTION JP2007110427
An object of the present invention is to provide an expressive acoustic space without increasing
the size of a main device. According to the present invention, in addition to the output of mid-tohigh range of audio signals from the speakers 14 and 15 of the main unit 2, the low level of the
audio signals transmitted from the main unit 2 via the DC power transmission cable 4 Since the
tone range can be output from the subwoofer 33 of the AC adapter 3, an expressive acoustic
space can be provided without increasing the size of the main unit 2. [Selected figure] Figure 1
Sound system
[0001]
The present invention relates to an audio system, and is suitably applied to, for example, a mobile
phone system that outputs music reproduced with high quality by a mobile phone connected to a
cradle.
[0002]
Conventionally, in a mobile phone system, it is obtained by charging a mobile phone terminal
placed on a charging stand, which is a main device, via the charging terminal of the charging
stand and reproducing music data by the mobile phone terminal. There is one that is made to
output sound from a charging stand speaker built in the charging stand (see, for example, Patent
Document 1).
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1
Japanese Patent Application Publication No. 2003-283609
[0003]
By the way, in the mobile telephone system having such a configuration, the size of the charging
stand speaker is restricted according to the miniaturization of the charging stand on which the
mobile telephone terminal is placed, so the diameter of cone paper in the charging stand speaker
is enlarged. It is difficult to do so, and there is a problem that the low range of the sound
outputted from the charging stand speaker runs short.
[0004]
The present invention has been made in consideration of the above points, and an object of the
present invention is to propose an acoustic system capable of providing an expressive acoustic
space without increasing the size of the main device.
[0005]
In order to solve such problems, in the sound system of the present invention, a power supply
adapter equipped with a woofer unit for outputting a low sound range of sound according to an
audio signal, and a speaker for outputting middle to high sound of sound according to an audio
signal A main device on which the unit is mounted and a power supply adapter and the main
device are connected, and a transmission cable for transmitting an audio signal from the main
device to the power supply adapter is provided in order to output a low tone range from the
woofer unit.
[0006]
As a result, in the audio system, in addition to the output of the middle to high range of the
sound corresponding to the audio signal from the speaker unit of the main device, the bass range
of the sound corresponding to the audio signal transmitted from the main device via the
transmission cable Since it can be output from the woofer unit of the power supply adapter, an
expressive acoustic space can be provided without increasing the size of the main device.
[0007]
According to the present invention, in addition to the output of the middle to high range of the
audio signal from the speaker unit of the main device, the low range of the audio signal
transmitted from the main device via the transmission cable is output from the woofer unit of the
AC adapter Thus, it is possible to realize an acoustic system that can provide a rich acoustic
space without increasing the size of the main device.
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2
[0008]
Hereinafter, an embodiment of the present invention will be described in detail with reference to
the drawings.
[0009]
(1) Overall Configuration of Sound System In FIG. 1, 1 generally shows a 2.1 channel sound
system according to the present invention, and a main unit 2 for charging a portable telephone
with a music reproduction function (described later). An AC (Alternating Current) adapter 3 for
supplying DC power of a predetermined voltage level, and a DC (Direct Current) power
transmission cable 4 connecting the main unit 2 and the AC adapter 3 are configured.
[0010]
The AC adapter 3 converts AC 100 [V] supplied from the AC plug 5 connected to a commercial
AC power supply (not shown) into DC 12 [V], and the DC power of the DC 12 [V] is transmitted
via the DC power transmission cable 4 The main unit 2 is operated by being supplied to the main
unit 2.
[0011]
(2) External Configuration of Main Unit As shown in FIG. 2, the main unit 2 is composed of a
main body 11 in the form of a triangular prism, and the charging base 12 in the form of a
semicircular thin plate from the approximate center of the main body 11 in the longitudinal
direction. The charging stand 12 is provided with a charging stand connection terminal 13 for
electrically connecting to a terminal connection terminal of a portable telephone with a music
reproduction function described later.
[0012]
Further, the main unit 2 is provided with a left speaker 14 and a right speaker 15 that mainly
output middle and high frequency ranges on both sides of the charging stand 12, and a grid is
provided to hide the left speaker 14 and the right speaker 15. A metal cover 10 with a small hole
in the form of a hole is attached.
[0013]
Furthermore, the main unit 2 is provided with a function switch 16 at the upper right end of the
main body 11 and a volume up button 17 and a down button 18 next to it, and a power display
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indicating the power on state at the upper left end of the main body 11 The surround function is
turned on via an LED (Light Emitting Diode) 19, a line-in display LED 20 indicating that the
external electronic device is connected via a line input terminal (described later), and an infrared
remote control (not shown) A surround display LED 21 is provided to indicate that it has become.
[0014]
The main unit 2 is provided with a light receiving unit 22 for the infrared remote control inside
the cover 10, the control command from the infrared remote control is received by the light
receiving unit 22, and the above-described surround function is received based on the control
command. It is designed to be turned on.
[0015]
On the other hand, as shown in FIG. 3, the main unit 2 has a DC input for receiving the supply of
DC 12 [V] DC power from the AC adapter 3 via the DC power transmission cable 4 to the lower
right end on the back right side of the main body 11 A terminal 25 is provided, and a line input
terminal 26 for inputting a music signal from an external electronic device (not shown) is
provided next to the DC input terminal 25.
[0016]
Therefore, the main unit 2 receives the supply of DC power of 12 [V] from the AC adapter 3 via
the DC power transmission cable 4 and, as shown in FIG. When the mobile phone 6 with the
music reproduction function is placed on the not shown, the connection terminal 13 for the
charging stand and the terminal connection terminal (not shown) provided at the lower end of
the mobile phone 6 with the music reproduction function And is electrically connected to start
charging.
[0017]
When the main unit 2 is electrically connected to the terminal connection terminal of the mobile
phone 6 with the music reproduction function and the connection terminal 13 for the charging
stand of the charging stand 12, the mobile phone 6 with the music reproduction function has an
internal memory. The music signal reproduced from the above is input via the charging stand
connection terminal 13, and the sound based on the music signal can be output from the left
speaker 14 and the right speaker 15.
[0018]
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(3) External Configuration of the AC Adapter The AC adapter 3 (FIG. 1) is composed of a main
body 31 of a quadrangular prism whose cross section has a trapezoidal shape, and the power
supply amplifier 32 and the subwoofer 33 are provided therein. .
[0019]
The AC adapter 3 is provided with a power switch 34 for switching on / off of the power on the
front surface 31A of the main body 31, and a port 35 for the subwoofer 33 concealed inside the
main body 31. By outputting the bass range outputted from the subwoofer 33 by the port 35 in a
state in which the bass range is further increased, the bass range is compensated for the middlehigh range output from the left speaker 14 and the right speaker 15 of the main unit 2 It is done
like that.
[0020]
As described above, since the AC adapter 3 only needs to cover the low-frequency range with the
subwoofer 33 and does not need to output the middle-high range, the concealing structure that
the subwoofer 33 is not exposed to the outside from the surface of the main body 31 Thus, the
user is not aware that the AC adapter 3 incorporates the subwoofer 33.
[0021]
Incidentally, although the AC adapter 3 constitutes a so-called Kelton-type speaker device in
which the woofer front face of the subwoofer 33 is concealed by the main body 31, the present
invention is not limited to the Kelton method, and various other speaker devices such as bass
reflex type and double bass reflex type. May be configured.
[0022]
(4) Circuit Configuration of Main Unit and AC Adapter Next, the circuit configuration of the main
unit 2 and the AC adapter 3 will be described with reference to FIG.
The main unit 2 is totally controlled by the MPU (Micro Processing Unit) 40, and is operated on
the basis of DC power supplied from the AC adapter 3 through the DC power transmission cable
4.
[0023]
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The main unit 2 is configured to input to the input selector 41 a music signal supplied from the
portable telephone 6 with a music reproduction function connected via the connection terminal
13 for a charging stand, and Music data supplied from an external electronic device connected
thereto is input to the input selector 41.
[0024]
As a default, the input selector 41 preferentially selects the music signal supplied from the
mobile phone 6 with the music reproduction function through the charging connection terminal
13 and sends it to an A / D (Analog / Digital) converter 42. It is done.
[0025]
The MPU 40 of the main unit 2 preferentially selects a music signal supplied from an external
electronic device based on the key signal S1 input in response to the user's pressing operation on
the function switch 16, and selects the A / D converter 42. It is made to be able to be sent out.
That is, the main unit 2 can selectively switch either the music signal from the portable telephone
6 with a music reproduction function or the music signal from an external electronic device in
response to the pressing operation on the function switch 16.
[0026]
The A / D converter 42 converts the audio signal into digital music data MD1 and sends the
music data MD1 to the digital signal processor 43.
The digital signal processor 43 applies predetermined digital signal processing to the music data
MD 1 and sends the music data MD 1 to the class D amplifier 44 and the digital interface
transmitter 45.
[0027]
The class D amplifier 44 performs amplification processing on the music data MD1 subjected to
digital signal processing, and the sound corresponding to the music signal for the left channel
and the music signal for the right channel obtained as a result is used for the speaker 14 for the
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left and the right It outputs from the speaker 15 respectively.
[0028]
The digital interface transmitter 45 converts the music data MD1 subjected to digital signal
processing into music data SMD1 in serial data format, and sends it to the superimposing circuit
46.
[0029]
The MPU 40 of the main unit 2 sets the volume level of the audio data MD1 output from the
digital signal processor 43 based on the control signal S2 input in response to the user's pressing
operation on the volume up button 17 and down button 18. It is made to be able to adjust.
[0030]
Incidentally, the MPU 40 of the main unit 2 can turn on and control the power display LED 19,
the line-in display LED 20, and the surround display LED 21 by outputting the LED control signal
S3 according to the operation state of the main unit 2. .
[0031]
On the other hand, the AC adapter 3 inputs AC power of AC 100 [V] supplied from a commercial
AC power supply to the switching power supply circuit 50 of the power supply amplifier unit 32.
The switching power supply circuit 50 converts AC 100 [V] AC power into DC 12 [V] DC power
supply DP, and supplies this to the MPU 52, receiver 53 and class D amplifier 54 via the
separation circuit 51.
[0032]
Further, the AC adapter 3 sends DC 12 [V] DC power supply current supplied from the switching
power supply circuit 50 to the main unit 2 from the DC terminal 55 via the DC power
transmission cable 4 and the DC input terminal 25 via the separation circuit 51. The DC power
supply DP is supplied by flowing, so that the mobile telephone 6 with a music reproduction
function can be charged through the connection terminal 13 for a charging stand.
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[0033]
The main unit 2 receives direct current from the AC adapter 3 via the DC power transmission
cable 4, and superimposes music data SMD 1 on the direct current by the superposition circuit
46 and transmits the data to the AC adapter 3. There is.
[0034]
In this case, as shown in FIG. 6, the main unit 2 transmits the music data SMD1 via the DC power
transmission cable 4 and the AC adapter 3 transmits the music data SMD1 transmitted via the DC
power transmission cable 4 to the separation circuit 51. It is made to input.
[0035]
As described above, the AC adapter 3 can receive the music data SMD1 from the main unit 2 via
the DC power transmission cable 4.
Thereby, the AC adapter 3 separates the direct current and the music data SMD1 by the
separation circuit 51, extracts only the music data SMD1, and sends it to the receiver 53.
[0036]
The receiver 53 demodulates the music data SMD1 and restores the original music data MD1,
and only low frequency components of the restored music data MD1 are filtered to obtain a bass
component MD1L, To the class amplifier 54.
The class D amplifier 54 is configured to amplify the low frequency range component MD1L and
to output a low frequency according to the low frequency range component MD1L from the
subwoofer 33.
[0037]
Furthermore, the main unit 2 is configured to be able to store the music data MD1 reproduced
and supplied by the mobile telephone 6 with the music reproduction function in the memory 47
after digital signal processing by the digital signal processor 43. The music data MD1 is read out
from the audio data storage device 1 so that the sound corresponding to the music data MD1 can
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be output from the left speaker 14 and the right speaker 15 via the D class amplifier 44.
[0038]
Thus, the main unit 2 can store many types of music data MD1 in the memory 47, reproduce the
music data MD1, and output it from the left speaker 14 and the right speaker 15. Therefore, the
main unit 2 has a music reproduction function. Even when the portable telephone 6 is not
connected, the main unit 2 itself can be a reproduction means and an audio output means of the
music data MD1.
[0039]
Furthermore, the main unit 2 is configured such that the MPU 40 can detect that there is an
incoming call to the mobile phone 6 with a music playback function connected via the
connection terminal 13 for a charging stand, and plays back the music data MD1. When the
incoming call of the mobile phone 6 with music reproduction function is detected during output
from the left speaker 14 and the right speaker 15, the volume level of the music data MD1 is
forcibly lowered through the digital signal processor 43, and the ring tone Can be output from
the left speaker 14 and the right speaker 15.
[0040]
After that, in the main unit 2, the hands-free state is changed, and after the ringing tone is output,
the other party's voice can also be output from the left speaker 14 and the right speaker 15.
[0041]
(5) Operation and Effect In the above configuration, in the sound system 1, the sound
corresponding to the music data MD1 reproduced by the mobile telephone 6 with the music
reproduction function connected via the charging connection terminal 13 of the main unit 2
Since the high range can be output from the left speaker 14 and the right speaker 15 and the low
frequency range of the sound corresponding to the music data MD1 can be output from the
subwoofer 33 of the AC adapter 3, only from the left speaker 14 and the right speaker 15 The
subwoofer 33 can sufficiently cover low frequencies that can not be output.
[0042]
At this time, in the sound system 1, the main unit 2 on which the left and right speakers 14 and
15 are mounted is installed, for example, on a table, and the concealed AC adapter 3 of the
subwoofer 33 is placed below the table in the main body 31. By setting it on the board, it is
possible to provide a rich acoustic environment from the low range to the middle and high range
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without causing the user to feel the presence of the subwoofer 33 at all.
[0043]
In particular, since the subwoofer 33 outputs only a low frequency band without directivity, the
AC adapter 3 can conceal the subwoofer 33 inside the main body portion 31, which makes it
possible to the user. It is possible to feel as if the sound from the low range to the middle and
high range is being output only by the left side speaker 14 and the right side speaker 15 of the
main unit 2.
[0044]
The AC adapter 3 outputs only the sound of the low frequency range component MD1lL tuned at
the port 35, and the subwoofer 33 is entirely covered by the main body portion 31, so that the
middle and high frequency range which could not be filtered by digital filtering. Even if the
subwoofer 33 temporarily outputs, the middle and high frequency range hardly leaks from the
main body portion 31 to the outside, and only the low frequency range can be reliably output by
the mechanical filtering structure.
[0045]
In the sound system 1, not only the DC power supply DP can be supplied from the AC adapter 3
to the main unit 2 by the DC power transmission cable 4 which is a power supply line, but also
the music data SMD1 from the main unit 2 to the AC adapter 3 With the structure capable of
transmission, there is no need to provide two power supply lines for the DC power supply DP and
a signal line for the music data SMD1, and the overall structure can be simplified.
[0046]
Therefore, in the sound system 1, the main unit 2 and the AC adapter 3 can be connected by the
general DC power transmission cable 4, so the subwoofer 33 is mounted instead of using the AC
adapter 3 according to the present invention. It is also possible to connect a common AC adapter
(not shown) by means of the DC power transmission cable 4, and the usability can be further
improved.
[0047]
According to the above configuration, in the sound system 1, the middle to high range is output
by the left speaker 14 and the right speaker 15 of the main unit 2, and the low range is output
by the subwoofer 33 concealed in the AC adapter 3. Therefore, it is possible to provide an
expressive listening environment without increasing the size of the main unit 2 by the subwoofer
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33 and without making the user feel the presence of the subwoofer 33.
[0048]
(6) Other Embodiments In the above-described embodiment, the sound based on the music signal
reproduced by the mobile telephone 6 with the music reproduction function is transmitted to the
left speaker 14 and the right speaker 15 of the main unit 2 and the AC adapter 3 However, the
present invention is not limited to this, and the present invention is not limited to this, and
reproduction is performed by an electronic device such as a semiconductor memory built-in type
or hard disk built-in type portable audio player or PDA (Personal Digital Assistant). The music
signal and the sound of the radio program may be output from the left speaker 14 and the right
speaker 15 of the main unit 2 and the subwoofer 33 of the AC adapter 3.
[0049]
Further, in the above-described embodiment, two speakers 14 for the left and two speakers 15
for the right are provided to the main unit 2 in the 2.1 channel sound system 1, and one
subwoofer 33 is provided to the AC adapter 3. Although the case has been described, the present
invention is not limited to this, and a plurality of two or more speakers may be provided for the
main unit 2, or a plurality of subwoofers may be provided for the AC adapter 3. .
[0050]
Furthermore, in the above-mentioned embodiment, although the case where main unit 2
provided with charging stand 12 was used as a main device was described, the present invention
is not limited to this, a notebook type personal computer as a main device Alternatively, an
electronic device such as a PDA may be used.
In this case, too, in addition to the sound output from the speaker of the notebook personal
computer or PDA, the subwoofer 33 of the AC adapter 3 can output the bass region, so the
expression rich in the bass region is sufficiently output. Sound space can be provided.
[0051]
Furthermore, in the above-mentioned embodiment, although the case where AC adapter 3 was
used as a power supply adapter was described, the present invention is not limited to this, and
DC power of a predetermined voltage level is applied to main unit 2 as a power supply adapter. A
supply DC-DC adapter may be used.
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[0052]
Furthermore, in the above-described embodiment, the case has been described where the main
unit 2 connects an external electronic device via the line input terminal 26, and music signals can
be input from the external electronic device. The invention is not limited to this, and a music
signal may be input to the main unit 2 via a removable memory stick (registered trademark of
Sony Corporation) or a USB (Universal Serial Bus) memory.
[0053]
The sound system of the present invention can be applied to an unfinished component system
using, for example, a small speaker which tends to run out of the bass range.
[0054]
FIG. 1 is a schematic perspective view showing an entire configuration of a sound system of the
present invention.
It is an approximate line perspective view showing front structure of a main unit.
It is an approximate line perspective view showing the back structure of a main unit.
It is an approximate line perspective view showing the charge state to the mobile telephone with
a music reproduction function.
FIG. 2 is a schematic block diagram showing a circuit configuration of a main unit and an AC
adapter.
It is a basic diagram by which it uses for explanation of superposition of music data to a DC
power transmission cable.
Explanation of sign
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[0055]
DESCRIPTION OF SYMBOLS 1 ...... Sound system, 2 ...... Main unit, 3 ...... AC adapter, 4 ...... DC
power transmission cable, 5 ...... AC plug, 6 ...... Mobile phone with music reproduction function,
10 ...... Cover, 11, 31 ...... Main unit 12, 12 充電 Charging stand, 13 接 続 Connection terminal for
charging stand, 14 ス ピ ー カ Left speaker, 15 ...... Right speaker, 16 16 Function switch 17, 17
UP button, 18 DOWN button , 19: power display LED, 20: line in display LED, 21: surround
display LED 21, 25: DC input terminal, 26: line input terminal, 32: power amplifier, 33:
subwoofer, 34: Power switch, 35: port, 40, 52: MPU, 41: input selector, 42: analog-to-digital
converter, 43: digital system Null processor, 44, 54 ...... D class amplifier, 45 ...... digital interface
transmitter, 46 ...... superimposing circuit, 50 ...... switching power supply, 51 ...... separating
circuit, 53 ...... receiver, 55 ...... DC terminals.
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