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JP2006157597

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DESCRIPTION JP2006157597
The present invention provides an acoustic device capable of preventing a sense of discomfort or
discomfort due to an increase in distortion even when an external speaker is connected. An audio
device 11 is incorporated in a connector or the like for connecting an external vehicle-mounted
speaker device 12. For example, when the external vehicle-mounted speaker device 12 is not
connected, an external connection detection signal is set to Low and an external vehicle-mounted
speaker The frequency of the EQ unit 3 includes an external connection detection unit 6 that
changes the external connection detection signal from low to high by connecting the device 12
and an analog switch to which the external connection detection signal is supplied from the
external connection detection unit 6. For example, when the external connection detection signal
is low, the EQ characteristic of the full range specification is used, and when the external
connection detection signal is high, the EQ (equalizer) switching unit 7 can be used as the EQ
characteristic that suppresses the bass range. Equipped with [Selected figure] Figure 1
Sound equipment
[0001]
The present invention relates to an audio device to which an external speaker can be connected.
[0002]
As a conventional audio apparatus, for example, in an on-vehicle audio apparatus, it is common
to listen to audio reproduced from a recording medium such as radio audio or CD (Compact Disc)
using a speaker installed in a vehicle.
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1
Further, it is also possible to separately connect a speaker (multi-way speaker) dividing the sound
range to be reproduced according to the user's preference, for example, to emphasize the bass
and enjoy the music.
[0003]
FIG. 6 is a schematic view for explaining a conventional on-vehicle audio apparatus, FIG. 6 (a) is a
plan view of the interior of the vehicle, and FIG. 6 (b) shows a dashboard of the interior of the
vehicle. In the in-vehicle audio apparatus, in addition to the in-vehicle speakers 63 and 64
provided at the rear of the vehicle 61, sound is output from an external in-vehicle speaker
apparatus 65 such as a subwoofer installed at the center of the dashboard 62. It has become so.
As a result, since the sound of the low frequency band is outputted from the external in-vehicle
speaker device 62 separately from the in-vehicle speakers 63 and 64, it is possible to listen to
music etc. in which the low frequency band is emphasized in the vehicle (for example, Reference
1).
[0004]
Japanese Patent Application Laid-Open No. 59-86992
[0005]
In the above-described conventional on-vehicle audio apparatus, a full-range speaker that
reproduces the sound of the entire band with a single speaker unit is often used as the on-vehicle
speakers 63 and 64. The frequency characteristic (EQ characteristic) emphasizing the low range
of the output voice is set according to the characteristic and the shape of the space in the car.
[0006]
However, when an external in-vehicle speaker device 65 such as a subwoofer is simply connected
to this in-vehicle audio device, the audio output from the in-vehicle speakers 63 and 64 remains
emphasized in the low-pitch range. , 64 and the sound output from the external on-vehicle
speaker device 65 such as a subwoofer that further enhances the bass range interfere with each
other to increase distortion, giving a sense of discomfort or discomfort to the user. there were.
[0007]
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2
The present invention has been made in view of the above-described conventional circumstances,
and it is an object of the present invention to provide an acoustic device capable of preventing an
increase in distortion and giving discomfort or discomfort even when an external speaker is
connected. And
[0008]
An audio apparatus according to the present invention is an audio apparatus to which an external
speaker can be connected, and includes a plurality of equalizer setting means for setting output
frequency characteristics, an external connection detection means for detecting the presence or
absence of connection of the external speaker, And equalizer switching means for switching the
connection of the equalizer setting means according to the presence or absence of the connection
of the external speaker detected by the external connection detection means.
[0009]
According to the above configuration, by providing the equalizer switching means for switching
the connection of the equalizer setting means according to the presence or absence of the
connection of the external speaker detected by the external connection detection means, the
equalizer setting means appropriate according to the presence or absence of the connection of
the external speaker Therefore, even when an external speaker is connected, it is possible to
prevent distortion from increasing and giving discomfort or discomfort.
[0010]
Also, in the audio apparatus according to the present invention, the equalizer setting unit
includes a first equalizer setting unit having a first output frequency characteristic and a second
equalizer setting unit having a second output frequency characteristic. The equalizer switching
means switches the connection to use at least one of the first equalizer setting means and the
second equalizer setting means according to the presence or absence of the connection of the
external speaker detected by the external connection detection means. is there.
[0011]
According to the above configuration, the equalizer switching unit uses at least one of the first
equalizer setting unit and the second equalizer setting unit depending on the presence or
absence of connection of the external speaker detected by the external connection detection unit.
By switching the connection as described above, the overall frequency characteristic can be
automatically optimized without changing the configuration of the equalizer setting means.
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[0012]
Further, in the sound apparatus of the present invention, the first output frequency characteristic
is emphasized in a low range.
[0013]
According to the above configuration, the first output frequency characteristic in which the bass
range is emphasized can not be output depending on the presence or absence of connection of
the external speaker. Can be prevented.
[0014]
Further, in the audio apparatus of the present invention, the connection is switched so that the
equalizer switching unit uses the equalizer setting unit having the frequency characteristic of the
full range specification when the external speaker is not connected.
[0015]
According to the above configuration, when the external speaker is not connected, the equalizer
switching unit switches the connection to use the equalizer setting unit having the frequency
characteristic of the full range specification when the external speaker is not connected. Since the
audio output of the frequency characteristic of the specification can be reproduced, it is possible
to realize a natural reproduced sound that matches the shape of the space in the car.
[0016]
Further, in the audio apparatus of the present invention, the equalizer switching means switches
the equalizer setting means based on an external connection detection signal for detecting
presence or absence of connection of the external speaker detected by the external connection
detection means.
[0017]
According to the above configuration, the equalizer switching means needs complicated setting
change by switching the equalizer setting means based on the external connection detection
signal for detecting presence or absence of connection of the external speaker detected by the
external connection detection means. Instead, the overall frequency response can be optimized
automatically.
[0018]
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Further, the acoustic device of the present invention includes power supply means for supplying
power to the amplifier integrated subwoofer to be connected, and the external connection
detection means detects the power supply voltage of the amplifier integrated subwoofer.
[0019]
According to the above configuration, by detecting the power supply voltage of the amplifierintegrated subwoofer, the external connection detection unit can detect the presence or absence
of the external connection with a simple configuration.
[0020]
Further, in the sound device according to the present invention, the external connection detection
unit detects connection of the external speaker by detecting on / off of a switch provided in a
connector insertion port to which the external speaker can be connected. .
[0021]
According to the above configuration, the external connection detection unit detects the
connection of the external speaker by detecting the on / off of the switch provided in the
connector insertion port to which the external speaker can be connected, with a simple
configuration. And the presence or absence of external speaker connection can be detected
reliably.
[0022]
Furthermore, in the audio apparatus of the present invention, the equalizer switching unit
switches the equalizer setting unit by turning on and off an analog switch.
[0023]
According to the above configuration, the equalizer switching unit switches the equalizer setting
unit by turning on and off the analog switch, so that the equalizer setting unit can be reliably
switched with a simple configuration.
[0024]
According to the present invention, the equalizer setting unit that switches the connection of the
equalizer setting unit according to the presence or absence of the connection of the external
speaker detected by the external connection detection unit is an equalizer setting unit suitable
according to the presence or absence of the connection of the external speaker Can be used.
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[0025]
Hereinafter, an on-vehicle audio apparatus according to an embodiment of the present invention
will be described in detail with reference to the drawings.
FIG. 1 shows a schematic block diagram of an on-vehicle audio apparatus according to an
embodiment of the present invention.
[0026]
In FIG. 1, the in-vehicle audio apparatus of this embodiment includes an audio apparatus 11
having a radio receiver and a CD player function, an in-vehicle speaker 5 capable of reproducing
an audio output having a frequency characteristic of full range specification, and an option And
an external on-vehicle speaker device 12 such as a subwoofer having a frequency characteristic
emphasizing a bass range.
[0027]
The audio device 11 includes a sound source 1, a signal processing unit 2, an EQ (equalizer) unit
3, an external connection detection unit 6, an EQ (equalizer) switching unit 7, and an internal
amplification unit 4.
[0028]
The sound source 1 outputs audio data including music data such as a CD.
The signal processing unit 2 performs level processing on audio data output from the sound
source 1 by, for example, an electronic volume.
The EQ unit 3 can selectively set an EQ characteristic of the full range specification set
corresponding to the in-vehicle speaker 5 and an EQ characteristic suppressing a low range set
corresponding to the external in-vehicle speaker 9 It is a thing.
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The external connection detection unit 6 detects the connection state of the external on-vehicle
speaker device 12. Specifically, whether the external on-vehicle speaker device 12 and the audio
device 11 are connected, that is, the external connection detection unit 6 Detect the connection
of the speaker.
The external connection detection unit 6 is built in a connector or the like for connecting the
external on-vehicle speaker device 12, and detects that the external on-vehicle speaker device 12
is not connected, for example, and sets the external connection detection signal to Low. It is
detected that the speaker device 12 is connected, and the external connection detection signal is
changed from low to high.
The EQ switching unit 7 switches the connection of the EQ unit 3 according to the presence or
absence of the connection of the external on-vehicle speaker device 12 detected by the external
connection detection unit 6.
The EQ switching unit 7 is constituted by an analog switch or the like to which an external
connection detection signal is supplied from the external connection detection unit 6, and for
example, when the external connection detection signal is low, the EQ characteristic of the full
range specification is supplied. When the external connection detection signal is high, the
connection is switched so as to set the EQ characteristic in which the low range is suppressed.
The internal amplification unit 4 amplifies the corrected audio signal output from the EQ unit 3.
[0029]
The external in-vehicle speaker device 12 includes an external amplification unit 8 that amplifies
audio data in which heavy bass is emphasized, and an external in-vehicle speaker 9 that
reproduces audio data in which heavy bass is emphasized.
[0030]
FIG. 5 is a block diagram showing details of the EQ unit 3 and the EQ switching unit 7 in the invehicle audio apparatus of the present embodiment.
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As shown in the figure, the EQ unit 3 corrects the frequency characteristics of the high frequency
range of the audio signal IN supplied from the signal processing unit 2 and the characteristics of
the vehicle-mounted speaker 5 with respect to the audio signal passing through the HPF 31. And
DIP1 (32) to suppress the frequency characteristics in consideration of the shape of the invehicle space, and the frequency characteristics in consideration of the characteristics of the invehicle speaker 5 and the shape of the in-vehicle space for audio signals passing through the
DIP1 (32) It has BOOST1 (33) and BOOST2 (34) which emphasizes and outputs audio | voice
output OUT.
[0031]
Further, the EQ switching unit 7 is configured by an analog switch SW or the like, and at least
one of BOOST1 (33) and BOOST2 (34) is detected depending on the presence or absence of
connection of the external on-vehicle speaker device 12 detected by the external connection
detection unit 6. Switch the connection to use.
In the EQ switching unit 7, for example, when the external connection detection signal supplied
from the external connection detection unit 6 is low (the external speaker system 12 is not
connected), the SW is connected to the low side. The audio signal passes BOOST1 (33) and
BOOST2 (34) in series to realize the full-range EQ characteristics (see FIG. 3) set in consideration
of the shape of the in-vehicle speaker 5 and the in-vehicle space.
[0032]
On the other hand, when the external connection detection signal supplied from the external
connection detection unit 6 is High (connected to the external on-vehicle speaker device 12), the
SW is connected to the High side, and in the EQ unit 3, the audio signal is BOOST1 (33). To pass
only BOOST2 (34) to realize an EQ characteristic (see FIG. 4) in which the bass range is
suppressed.
[0033]
Next, the operation of the on-vehicle audio apparatus shown in FIG. 1 will be described.
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The sound source 1 outputs audio data including music data, and level processing of the audio
data output from the sound source 1 is performed by a signal processing unit 2 such as an
electronic volume.
Then, the audio data level-processed by the signal processing unit 2 is supplied to the EQ unit 3.
[0034]
In the EQ unit 3, when the external in-vehicle speaker device 12 is not connected to the audio
device 11, the external connection detection unit 6 sets the external connection detection signal
to Low to use BOOST 1 (33) and BOOST 2 (34) Make it
As a result, the audio data level-processed by the signal processing unit 2 has three points of the
DIP 1 and BOOST 1 and 2 set by the EQ unit 3 in consideration of the characteristics of the invehicle speaker 5 and the shape of the in-vehicle space. The audio data is corrected so that the
sound of the entire band can be satisfied by one speaker unit by the provided EQ characteristic of
the full range specification as shown in FIG.
The corrected audio signal is amplified by the internal amplifier 4 and output as audio from the
on-vehicle speaker 5.
[0035]
On the other hand, the external connection detection signal is automatically switched from low to
high by connecting the external on-vehicle speaker device 12 to the external connection
detection unit 6 configured by a connector or the like.
Then, in conjunction with that, the EQ switching unit 7 composed of an analog switch or the like
is switched to make BOOST 1 (33) non-use, so that the EQ characteristic in which the bass range
is suppressed as shown in FIG. Use it to correct voice data.
As a result, the audio data is output from the in-vehicle speaker 5 without distortion from the
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9
middle range to the high range, and the audio data is amplified by the external amplification unit
8 and the output of the audio data in which heavy bass is emphasized by the external in-vehicle
speaker 9 Can be made possible.
The external connection detection unit 6 is connected to the external on-vehicle speaker device
12 by detecting the power supply voltage of the external on-vehicle speaker device 12 such as an
amplifier integrated subwoofer connected to the power supply terminal of the audio device 11.
The presence or absence of may be detected.
[0036]
FIG. 2 shows a flowchart for explaining the operation of the in-vehicle audio apparatus of the
present embodiment.
The on-vehicle audio apparatus of the present embodiment will be described according to a
flowchart.
[0037]
When the on-vehicle audio device is activated, first, the external connection detection unit 6
detects the presence or absence of connection of the external on-vehicle speaker device 12 such
as a subwoofer (step S1).
Then, according to the detection result, the external connection detection signal is set to Low or
High as shown in FIG. 5 and automatic switching is performed using an analog switch or the like
to use or not use BOOST 1 (33) of the EQ unit 3 Switch EQ characteristics.
[0038]
When the external connection detection unit 6 does not detect the external on-vehicle speaker
device 12 such as a subwoofer, the external connection detection signal becomes low, and EQ
characteristics 1 of the full range specification as shown in FIG. 3 (step S2) are used. By
correcting the audio data, a natural audio output is realized in accordance with the
characteristics of the in-vehicle speaker 5 and the shape of the in-vehicle space (step S3).
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[0039]
On the other hand, when the external on-vehicle speaker device 12 such as a subwoofer is
detected, the external connection detection signal becomes high, and BOOST1 (33) of the EQ unit
3 is not used, as shown in FIG. It automatically switches to the proper EQ characteristic 2 (step
S4), suppresses the low frequency range, outputs from the in-vehicle speaker 5 without
distortion from the middle frequency range to the high frequency range, and uses the external invehicle speaker device 12 Can be realized (step S5).
[0040]
As described above, according to the on-vehicle audio device of the present embodiment, the
external connection detection unit that detects the connection of the external on-vehicle speaker
device 12 such as a subwoofer configured by the external on-vehicle speaker 9 and the external
amplification unit 8 6 and EQ switching unit 7 such as an analog switch that automatically
controls switching of the EQ characteristics based on the detection result of the external
connection detection unit 6 and EQ switching unit 7 switch the EQ characteristics to the full
range specification and the multiway specification By providing the EQ unit 3, at the time of
external connection detection, the bass range is suppressed as shown in FIG. 4 to output audio
data from the vehicle-mounted speaker 5 without distortion from the middle range to the high
range, and the external vehicle-mounted speaker 9 Can be used to listen to music with
emphasized deep bass.
[0041]
On the other hand, when external connection is not detected, natural voice output in the vehicle
can be obtained by switching to the full-range EQ characteristics set according to the
characteristics of the in-vehicle speaker 5 as shown in FIG. 3 and the shape of the in-vehicle
space. It can be realized.
[0042]
Further, in the in-vehicle audio device of the present embodiment, an amplifier integrated
subwoofer that receives power supply from a vehicle or in-vehicle device (such as a car audio)
can be used as the external in-vehicle speaker device 12.
In this case, a Woofer CON terminal for detecting the connection of the subwoofer is provided in
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addition to the terminal for the audio line in the woofer connector of the amplifier-integrated
subwoofer.
Then, when the subwoofer is connected, the Woofer CON terminal outputs High as an external
connection detection signal from the power supply supplied from the vehicle or the on-vehicle
device to the subwoofer, and automatically switches the EQ characteristics.
[0043]
Alternatively, instead of detecting the presence or absence of connection of the external onvehicle speaker device 12 by the electric signal as described above, a mechanical switch is
provided in the connector insertion port of the external on-vehicle speaker device 12 provided in
the on-vehicle audio device It is also possible to detect the presence or absence of connection of
the external in-vehicle speaker device 12.
[0044]
As described above, according to the in-vehicle audio device of the present embodiment, when
the connection detection of the external in-vehicle speaker device 12 is detected, the in-vehicle
speaker 5 outputs the medium-to-high range without distortion from the medium range to the
high range. It can be used to listen to music or the like in which the low range is emphasized.
On the other hand, when the external in-vehicle speaker device 12 is not connected, by switching
to the multiway output, natural reproduction matched to the characteristics of the in-vehicle
speaker 5 is realized.
Therefore, after purchasing the in-vehicle audio device, the external in-vehicle speaker device 12
can be easily connected without making complicated settings such as frequency characteristics.
[0045]
The present invention includes equalizer switching means for switching the connection of the
equalizer setting means according to the presence or absence of the connection of the external
speaker detected by the external connection detection means, thereby providing an equalizer
setting means appropriate for the presence or absence of the connection of the external speaker.
Since it can be used, distortion is increased even when an external speaker is connected, which
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has the effect of preventing discomfort and discomfort, and is useful for an audio device or the
like to which an external speaker can be connected.
[0046]
A schematic configuration diagram of an on-vehicle audio apparatus according to an embodiment
of the present invention. Flow chart for explaining an operation of the on-vehicle audio apparatus
of the present embodiment. EQ characteristic in which the EQ characteristic audio signal
bypasses BOOST1 and passes only BOOST2 and suppresses the bass region. Block characteristic
showing details of the EQ unit and the EQ switching unit in the in-vehicle audio device of the
present embodiment. Schematic to explain
Explanation of sign
[0047]
Reference Signs List 1 sound source 2 signal processing unit 3 EQ unit 4 internal amplification
unit 5, 63 64 automotive speaker 6 external connection detection unit 7 EQ switching unit 8
external amplification unit 9 external automotive speaker 11 audio device 12, 65 external
automotive speaker device 31 HPF 32 DIP1 33 BOOST1 34 BOOST2 61 Vehicle 62 Dashboard
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