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JP2008118430

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DESCRIPTION JP2008118430
The present invention provides a connecting device of audio equipment in which a plurality of
audio equipment can be easily connected to one speaker with a simple configuration. A first
winding 1 connected to a first acoustic device 6a for transmitting a drive signal of a speaker 7a,
and a second acoustic device different from the first acoustic device 6a to which the first winding
1 is connected 6b connected to the second winding 2 for transmitting a drive signal of the
speaker 7a, a third winding 3 connected to the speaker 7a, a first winding 1, a second winding 2
and a third winding 3 And are magnetically coupled to each of the first winding 1, the second
winding 2 and the third winding 3, and by electromagnetic induction, the first winding 1 and the
second winding 2 Of the first winding 1 and the third winding 3 and the number of turns of the
second winding 2 and the third winding 3 Set the ratio to 1 both. [Selected figure] Figure 1
Audio equipment connection device
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
connecting device of audio equipment for connecting a speaker and a plurality of audio
equipment.
[0002]
Conventionally, in the cab of a working machine represented by a hydraulic shovel, in addition to
an operation lever, an operation switch, a monitor, an air conditioner, acoustic devices such as
radios and radios, and speakers for those acoustic devices are provided. There is.
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As a speaker, a dedicated item corresponding to each audio device is usually used. With the
advancement of work machines, the number and types of devices disposed in a cab are
increasing, and the layout is becoming more complicated and the indoor space is becoming
narrower.
[0003]
In recent years, addition of equipment such as a CD / MD player and a DVD drive has been
demanded as an option of audio equipment. However, if a space for attaching a speaker
dedicated to each of these audio devices is secured in the cab, not only the indoor space becomes
narrower, but also the wiring to the speaker becomes complicated and the cost increases. With
respect to such problems, it is conceivable to use a method of connecting a plurality of audio
devices to one speaker. For example, as described in Patent Document 1, a switch for selecting
one of a plurality of speaker input lines is provided, and the speaker input line connected to the
speaker device is switched by a switch operation. Thereby, an electrical signal from an arbitrary
speaker input line can be output from one speaker device. JP 2003-111184 A
[0004]
However, with the technology described in Patent Document 1, it is not possible to
simultaneously connect two or more input lines among a plurality of speaker input lines. That is,
in general audio equipment, when the low frequency output circuits are directly connected to
each other, the output signal of one circuit may cause the other circuit to fail. Therefore, it is
necessary to make each circuit independent. Therefore, it is difficult to simultaneously output
electric signals from two or more input lines from the speaker device.
[0005]
Moreover, since the output system of the audio equipment in recent years is two systems (stereo
output of the left channel and the right channel), as described in the above-mentioned patent
document 1, the input signal is switched using a switch or a relay Requires switches and relays
corresponding to the left and right speakers, which complicates the circuit configuration. The
present invention has been made in view of such problems, and provides a connecting device for
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audio equipment that can easily connect a plurality of audio equipment to one speaker with a
simple configuration. The purpose is to
[0006]
In order to achieve the above object, the connection device for audio equipment of the present
invention according to claim 1 is interposed between a speaker and a plurality of audio
equipment for outputting a drive signal of the speaker to transmit the drive signal In a
connecting device for audio equipment, a first winding connected to a first audio equipment of
the plurality of audio equipment and transmitting a drive signal of the speaker, and the first
winding among the plurality of audio equipment. A second winding connected to a second audio
device different from the first audio device to which the second audio device is connected to
transmit a drive signal of the speaker, a third winding connected to the speaker, and the first
winding A winding, the second winding and the third winding are electrically isolated and
magnetically coupled to each of the first winding, the second winding and the third winding; And
a magnetic circuit for transmitting the drive signal of the first winding and the second winding to
the third winding by electromagnetic induction. Turns ratio of the first winding and the third
winding, and is characterized in that the turns ratio of the second winding and the third winding
are both set to 1.
[0007]
That is, the drive signal of the first winding and the second winding causes a magnetic field
fluctuation in the magnetic circuit, and an induced electromotive force is generated in the third
winding.
The drive signal of the speaker is an alternating electric signal. Preferably, the magnetic circuit is
an iron core inserted into the coils of the first winding, the second winding and the third winding.
Alternatively, the magnetic circuit may be disposed outside the coils of the first winding, the
second winding and the third winding.
[0008]
Further, according to the second aspect of the present invention, the connecting device for audio
equipment of the present invention is connected to a second speaker different from the speaker
to which the third winding is connected in the configuration according to the first aspect. And a
fourth winding magnetically coupled to each of the first winding and the second winding and
transmitting the driving signal of the first winding and the second winding by electromagnetic
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induction. And the turns ratio of the first winding and the fourth winding, and the turns ratio of
the second winding and the fourth winding are both set to 1.
[0009]
That is, the same drive signal as that of the speaker is supplied to the second speaker by the
induced electromotive force.
Further, according to the third aspect of the present invention, in the configuration of the first or
second aspect, the speaker is a stereo speaker comprising a left channel speaker and a right
channel speaker, Each of the one acoustic device and the second acoustic device outputs a left
channel drive signal and a right channel drive signal, and the first winding, the second winding,
the third winding, and the magnetic circuit , And a pair of the left channel drive signal and the
right channel drive signal.
[0010]
According to a fourth aspect of the present invention, in the audio device connecting apparatus
of the fourth aspect, the pair of windings is provided, and one of the windings is magnetically
coupled to the magnetic circuit for the left channel. A first closed circuit coupled to generate a
left channel drive signal, and a pair of windings, wherein one winding is magnetically coupled to
a right channel magnetic circuit and coupled to a right channel drive signal. , A fifth winding
connected to the speaker and a third speaker different from the second speaker, the other
winding in the first closed circuit, and the second closed circuit. While electrically insulating the
other winding and the fifth winding, and for each of the other winding in the first closed circuit,
the other winding in the second closed circuit, and the fifth winding The left channel drive signal
and the right channel are magnetically coupled and electromagnetically induced. Is characterized
by further comprising a second magnetic circuit for transmitting a differential signal of Le drive
signal to said third winding.
[0011]
That is, the drive signal of the SQ (speaker matrix) system is transmitted to the fifth winding by
the second magnetic circuit.
[0012]
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According to the connection apparatus for audio equipment of the present invention (claim 1),
the outputs of the first audio equipment and the second audio equipment can be simultaneously
transmitted to one speaker.
For example, while listening to music on a radio or CD, the same speaker can be used to listen to
the audio received by the radio.
In addition, since the turns ratio is set to 1 on the input side, the output side, and the like, current
and voltage are not converted, and the applicability to conventional audio equipment is high. In
addition, the structure is simple and inexpensive, high in structural reliability, and hard to break
down.
[0013]
Furthermore, the speakers and the audio devices connected by the connection device are
electrically isolated, and only the signal component of the electrical signal is transmitted, so it
does not depend on the output circuit system or the ground system of each audio device. Further,
according to the connection apparatus for audio equipment of the present invention (claim 2),
the second speaker can be functioned as a sub speaker of the speaker. Thereby, the acoustic
effect of the speaker can be enhanced.
[0014]
Further, according to the connection apparatus for audio equipment of the present invention
(claim 3), stereo outputs of the first audio equipment and the second audio equipment can be
simultaneously transmitted to the pair of stereo speakers. Further, according to the connecting
apparatus for audio equipment of the present invention (claim 4), the pseudo reverberation
sound can be output from the third speaker with a simple configuration. That is, it is possible to
easily construct a 5.1ch surround system without using a DSP that utilizes complex digital
technology.
[0015]
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Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a schematic view showing an entire configuration of a connecting device for
audio equipment according to an embodiment of the present invention. [Composition] Here, what
applied connection device 10 of acoustic equipment to a cab of a hydraulic shovel as a work
machine is illustrated. As shown in FIG. 1, the connection device 10 is interposed between the
right speaker 7a and the left speaker 7b and two types of audio (first and second audio devices)
6a and 6b. It functions to transmit drive signals output from the audios 6a and 6b to the
speakers 7a and 7b.
[0016]
Each of the right speaker 7a, the left speaker 7b, and the audio 6a and 6b is provided in the cab
of the hydraulic shovel, as in the connection device 10. Each audio 6a, 6b includes general audio
equipment that generates sound (music, voice, etc.) using a speaker. Specifically, a radio, a CD
player, an MD player, a DVD player, a wireless device (Transceiver transceiver) etc. are included.
Further, in the case of a work machine having a function of notifying the operation mode by
voice, a control device for outputting the voice is also included in this. Here, each of the audios
6a and 6b has a stereo output, and has an output circuit for the right channel and an output
circuit for the left channel. An output circuit for the right channel outputs a drive signal for the
right speaker 7a, and an output circuit for the left channel outputs a drive signal for the left
speaker 7b.
[0017]
As shown in FIG. 1, the present connection device 10 is configured to include two sets of
synthetic transformers 5a and 5b. Since each synthetic metamorphic device 5a, 5b has
substantially the same configuration, one synthetic metamorphic device 5a will be described in
detail below. The synthetic transformation device 5a includes a first winding 1, a second winding
2, a third winding 3 and an iron core (magnetic circuit) 4. The first winding 1 is a coil connected
to an output circuit for the right channel of the audio 6a to transmit a drive signal of the right
speaker 7a. On the other hand, the second winding 2 is a coil connected to the output circuit for
the right channel of the audio 6b to transmit a drive signal of the right speaker 7a. The third
winding 3 is a coil connected to the right speaker 7a.
[0018]
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The iron core 4 is a magnetic body inserted in each coil of the first winding 1, the second
winding 2 and the third winding 3 and a magnetic field in each coil of the first winding 1 and the
second winding 2 The variation is transmitted to the coil of the third winding 3 to generate an
induced electromotive force in the third winding 3. That is, the iron core 4 magnetically couples
the coils of the first winding 1, the second winding 2 and the third winding 3 and transmits a
drive signal from the primary side to the secondary side by electromagnetic induction. The coils
of the first winding 1, the second winding 2 and the third winding 3 are wound around the iron
core 4 in a state of being electrically insulated from each other. The iron core 4 may have any
material, shape, etc. as long as it generates excitation current for the first winding 1 and the
second winding 2 in the third winding 3. For example, the first winding of the iron core 4 is
performed. It may be disposed outside the coils of the wire 1, the second winding 2 and the third
winding 3.
[0019]
Further, the number of turns of the first winding 1 and the number of turns of the third winding
3 are set to the same number of turns. Similarly, the number of turns of the second winding 2
and the number of turns of the third winding 3 are the same. That is, the turns ratio of the first
winding 1 and the third winding 3 and the turns ratio of the second winding 2 and the third
winding 3 are both set to 1. The synthetic transformation device 5a functions as a transformer
that transmits only the signal component without changing the voltage transmitted from the
audios 6a and 6b to the right speaker 7a. For example, the signal output according to the
impedance of the right speaker 7a Does not have the ability to convert The other synthetic
transformer 5b functions as a transformer for transmitting only the signal component of the
drive signal from each of the audios 6a and 6b to the left speaker 7b. In FIG. 1, the polarities of
the coils of the windings 1 to 3 are indicated by black circles. Here, the polarities of the first
winding 1 and the second winding 2 are arranged to be aligned with each other (in the same
direction).
[0020]
[Operation and Effect] With such a configuration, in one combining / transforming device 5a, the
drive signal of the right speaker 7a output from the two types of audio 6a and 6b is combined
and transmitted to the right speaker 7a. Further, in the other combining / transforming device
5b, the drive signal of the left speaker 7b is combined and transmitted to the left speaker 7b.
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Therefore, according to the connection device 10 of the present audio device, stereo outputs
from the two types of audio 6a and 6b can be simultaneously transmitted to the pair of speakers
7a and 7b. For example, when one audio 6a is a radio and the other audio 7b is a radio, the
conventional method can only select either the radio or the radio, but using the present
connection device 10 The audio of the radio and the audio of the radio can be superimposed and
listened simultaneously.
[0021]
Further, in the present connection device 10, since the first winding 1, the second winding 2 and
the third winding 3 are electrically isolated from each other, depending on the output circuit
system and the ground system of each acoustic device. It can also be used to connect any audio
equipment and speakers. For example, it is possible to connect a device with negative ground and
a device with positive ground, and the output circuit can be applied with a transformer, capacitor
coupling or complementary (single power supply or dual power supply).
[0022]
In addition, since the turns ratio is set to 1 on the input side, the output side, and the like, current
and voltage are not converted, and the applicability to conventional audio equipment is high. For
example, when it is desired to convert the signal output in accordance with the impedance of
each of the speakers 7a and 7b, a known transformer may be interposed between the main
connection device 10 and each of the audios 6a and 6b. Furthermore, since the present
connection device 10 has an extremely simple configuration including the three windings 1 to 3
and the iron core 4, it can be manufactured inexpensively. In addition, there is an advantage that
structural reliability is high and failure is difficult.
[0023]
[Others] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and various modifications
can be made without departing from the spirit of the present invention. For example, although
the above-mentioned embodiment illustrated what connected connection device 10 of acoustic
equipment concerning the present invention in a cab of a hydraulic shovel, application object of
this connection device 10 is not limited to this. As long as a plurality of audio devices and
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speakers are provided, the connection device 10 can be used for any target.
[0024]
Moreover, in the above-mentioned embodiment, although it is set as the structure provided with
two synthetic ¦ combination metamorphic apparatus 5a, 5b in one connection apparatus 10, the
number of a synthetic ¦ combination metamorphic apparatus may be one or three or more. It
may be.
[0025]
[Modification 1] In the above-described embodiment, the first winding 1 and the second winding
2 are disposed on the primary side, and the third winding 3 is disposed on the secondary side, in
each of the synthetic transformation devices 5a and 5b. Although arranged, it is also conceivable
to add a winding on the secondary side.
[0026]
For example, as shown in FIG. 2, additional speakers (second speakers) 7a 'and 7b' corresponding
to each of the right speaker 7a and the left speaker 7b are provided, and the fourth volume is
provided on the secondary side of the synthetic transformation devices 5a and 5b. Add line 8
The number of turns of the fourth winding 8 is set equal to the number of turns of the first
winding 1 and the second winding 2.
By connecting the fourth winding 8 to the extension speakers 7a 'and 7b', the same drive signal
as the right speaker 7a is input to the extension right speaker 7a ', and the extension left speaker
7b' is the same as the left speaker 7b. The drive signal of is input and functions as a sub-speaker.
Therefore, the number of connectable speakers can be increased, and the acoustic effect can be
enhanced.
[0027]
[Modification 2] Also, by devising the circuit configuration, it is possible to construct a surround
system even with a normal stereo output sound device such as the audio 6a and 6b in the above-
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described embodiment. For example, as shown in FIG. 3, in addition to the right speaker 7a and
the left speaker 7b, a total of five types of speakers, a sub right speaker 7c, a sub left speaker 7d
and a woofer (third speaker) 7e, are provided. Provides three sets of synthetic metamorphic
devices 5a-5c. The iron core 4 of the synthetic metamorphic device 5a is a magnetic circuit for
the left channel, and the iron core 4 of the synthetic metamorphic device 5b is a magnetic circuit
for the right channel.
[0028]
First, the first winding 1 is connected to one of the audios 6a and the second winding 2 is
connected to the other of the audios 6b in each of the synthetic transformation devices 5a and
5b. The third winding 3 is connected to the right speaker 7a or the left speaker 7b, respectively.
A fourth winding connected to the sub right speaker 7c or the sub left speaker 7d is provided on
the secondary side of each of the synthetic transformation devices 5a and 5b. These fourth
windings are connected to each other as shown in FIG. That is, a signal of the difference between
the drive signals transmitted to the right speaker 7a and the left speaker 7b is transmitted to the
sub right speaker 7c and the sub left speaker 7d. Thereby, the reverberation component (pseudo
reverberation effect sound) of the sound output from the right speaker 7a and the left speaker 7b
is output from the sub right speaker 7c and the sub left speaker 7d.
[0029]
On the other hand, there is provided a closed circuit (first closed circuit) 11 in which one winding
11a is disposed on the primary side of the synthetic transformation device 5b and the other
winding 11b is disposed on the primary side of the synthetic transformation device 5c. Similarly,
a closed circuit (second closed circuit) 12 is provided in which one winding 12a is disposed on
the primary side of the synthetic transformation device 5a and the other winding 12b is disposed
on the primary side of the synthetic transformation device 5c. The fifth winding 9 connected to
the woofer 7e is disposed on the secondary side of the synthetic metamorphic device 5c. Further,
a low pass filter circuit 13 is interposed between the fifth winding 9 and the woofer 7e.
[0030]
That is, the low frequency signal component is transmitted to the woofer 7e among the
difference signals of the drive signals transmitted to the right speaker 7a and the left speaker 7b.
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As a result, in the woofer 7e, the low-range reverberant sound component (pseudo reverberation
sound) is output among the sounds output from the right speaker 7a and the left speaker 7b. The
number of turns of the other winding 11b in the closed circuit 11 and the number of turns of the
other winding 12b in the closed circuit 12 are set equal, and the number of turns of the other
winding 11b in the closed circuit 11 and a fifth The number of turns of the winding 9 is set to be
the same.
[0031]
With such a configuration, it is possible to output a pseudo reverberation sound from the sub
right speaker 7c, the sub left speaker 7d and the woofer 7e. That is, it is possible to easily
construct a surround system without using a DSP that makes full use of complicated digital
technology. A 5.1ch surround system can be constructed by further adding a front speaker to the
configuration shown in FIG.
[0032]
It is a schematic diagram which shows the whole structure of the connection apparatus of the
audio equipment concerning one Embodiment of this invention. It is a schematic diagram which
shows the whole structure of the connection apparatus of the audio equipment which concerns
on the modification of this invention. It is a schematic diagram which shows the whole structure
of the connection apparatus of the audio equipment which concerns on the modification of this
invention.
Explanation of sign
[0033]
DESCRIPTION OF SYMBOLS 1 1st winding 2 2nd winding 3 3rd winding 4 iron core (magnetic
circuit) 5a, 5b, 5c Synthetic metamorphic equipment 6a audio (1st audio equipment) 6b audio
(2nd audio equipment) 7a, 7b Speaker 7a ', 7b' Additional speaker (second speaker) 7 e Woofer
(third speaker) 8 fourth winding 9 fifth winding 10 connection device 11 closed circuit (first
closed circuit) 12 closed circuit (second closed circuit)
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