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JP2005341186

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DESCRIPTION JP2005341186
PROBLEM TO BE SOLVED: To automatically make appropriate the sound quality of reproduced
sound based on audio data recorded in a recording medium according to the acoustic
characteristic of a room. In a sound quality adjustment apparatus provided with a DSP 4 for
adjusting the sound quality of reproduced sound based on audio data read from a CD 21 based
on equalizing characteristic data, a CPU of a controller 11 corresponds to audio data to be
reproduced to the CD 21. It is judged whether or not the proper equalizing characteristic data
21A is recorded, and when the proper equalizing characteristic data 21A is recorded, the indoor
room in which the proper equalizing characteristic data 21A read from the CD 21 and the
reproduction sound are actually output. Based on the acoustic characteristic data, the correction
equalizing characteristic data is calculated, and the correction equalizing characteristic data is
output to the DSP 4. [Selected figure] Figure 1
Sound quality adjustment device, control method of sound quality adjustment device, control
program and recording medium
[0001]
The present invention relates to a sound quality adjustment device that adjusts sound quality
based on equalizing characteristic data, a control method of the sound quality adjustment device,
a control program, and a recording medium.
[0002]
A sound quality adjustment apparatus is conventionally provided to adjust the sound quality of
reproduced sound to be reproduced based on audio data recorded on a recording medium such
as a CD (Compact Disc) based on equalizing characteristic data, and the reproduced sound is
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output by a speaker Audio devices are generally known.
[0003]
Among the sound quality adjustment devices of this type, there is one that automatically adjusts
the sound quality in accordance with a music pattern indicating the type of music and the like
(see, for example, Patent Document 1).
Japanese Patent Application Laid-Open No. 7-58566
[0004]
By the way, the speaker of the audio apparatus provided with the above-mentioned sound quality
adjustment device is installed in various rooms such as a car room, and the user responds to the
acoustic characteristic of the room (for example, the car room) where the speaker is installed.
The sound quality of the playback sound to be heard becomes different.
[0005]
Therefore, even if the sound quality is adjusted according to the music pattern, this adjustment
alone does not necessarily provide the optimum sound quality, and when the sound quality
suitable for the room can not be obtained like this, the user's operation There is a problem that
the sound quality has to be adjusted and the operation is troublesome.
[0006]
Therefore, an object of the present invention is to solve the problems of the above-described
conventional techniques, and to automatically adjust the sound quality according to the room, a
sound quality adjustment device, a control method of the sound quality adjustment device, a
control program It is about providing a medium.
[0007]
In order to solve the above-mentioned problems, the present invention provides a sound quality
adjustment apparatus comprising an adjustment means for adjusting the sound quality of
reproduced sound based on audio data read from a recording medium based on equalizing
characteristic data. Determination means for determining whether or not the proper equalizing
characteristic data corresponding to the audio data to be recorded is recorded, and when the
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proper equalizing characteristic data is recorded, the proper equalizing characteristic data read
from the recording medium is actually And calculating means for calculating the equalizing
characteristic data on the basis of the room acoustic characteristic data of the room to which the
reproduced sound is output.
[0008]
In this sound quality adjustment device, the calculation means may calculate the equalizing
characteristic data from a difference between the appropriate equalizing characteristic data and
the room acoustic characteristic data.
[0009]
Further, in the control method of the sound quality adjustment device for adjusting the sound
quality of the reproduced sound based on the audio data read from the recording medium based
on the equalizing property data, the equalizing property data corresponding to the audio data to
be reproduced is recorded on the recording medium. In the first step of determining whether or
not recording is performed, and in the case where the appropriate equalizing characteristic data
is recorded, the indoor room in which the appropriate equalizing characteristic data read from
the recording medium and the reproduction sound are actually output And a second step of
calculating the equalizing characteristic data based on the acoustic characteristic data.
[0010]
A control program for causing a computer to control a sound quality adjustment device
comprising an adjustment means for adjusting the sound quality of reproduced sound based on
audio data read from a recording medium based on equalizing characteristic data, the recording
medium It is determined whether the proper equalizing characteristic data corresponding to the
audio data to be reproduced is recorded, and if the proper equalizing characteristic data is
recorded, the correct equalizing characteristic data read from the recording medium is actually
read. The equalizing characteristic data is calculated based on the room acoustic characteristic
data of the room to which the reproduced sound is output.
[0011]
A computer readable recording medium is characterized in that the control program is recorded.
[0012]
According to the present invention, the sound quality of the reproduced sound based on the
audio data recorded in the recording medium can be automatically made appropriate according
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to the acoustic characteristic of the room.
[0013]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
In this embodiment, an on-vehicle audio device mounted on a vehicle or the like will be
exemplified as one aspect of the audio device provided with the sound quality adjustment device.
FIG. 1 is a block diagram showing a functional configuration of the on-vehicle audio device 1
according to the present embodiment.
[0014]
The in-vehicle audio device 1 classifies the frequency band of the sound to be reproduced into
four of high range, middle range, low range and subwoofer, and further, the sound of each
frequency band can be reproduced in stereo, as shown in FIG. And an analog terminal output unit
8 for outputting each of the signals in the frequency band (reproduction analog signal) to a
speaker (not shown).
[0015]
In the first embodiment, the on-vehicle audio device 1 includes a sound quality adjustment device
20 having a DSP (Digital Signal Processor) 4 and a controller 11.
[0016]
The controller 11 is configured by a microcomputer or the like, and controls each part of the invehicle audio device 1 including the DSP 4.
Specifically, the controller 11 outputs equalizing characteristic data indicating an equalizing
curve used to adjust the sound quality to the DSP 4.
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The controller 11 is connected to the operation unit 12 including various operation keys such as
operation keys and volume switches and operation switches, and various operations on the
operation unit 12 by the user are input to the controller 11. The controller 11 executes
processing in response to this input.
Furthermore, a display unit 13 including a display panel (not shown), a driver circuit (not shown)
for driving the display panel, and the like is connected to the controller 11. The display unit 13 is
a controller Under the control of 11, various information such as the operation state of the onvehicle audio device 1, reproduced music, and a reception radio channel are displayed.
[0017]
Further, the in-vehicle audio device 1 reads digital data (audio data and the like) recorded in the
CD 21 as a recording medium, and outputs a digital signal to the DSP 4 through the digital
interface 3. CD drive 2 as a digital audio source Has a built-in.
The digital interface 3 is connected to the CD drive 2 in a serial signal and in parallel to a DSP 4
and converts the digital signal from the CD drive 2 into a parallel signal of two channels
consisting of an L channel and an R channel for stereo reproduction. Output to DSP4.
[0018]
The DSP 4 performs equalizing processing to adjust digital signals representing the inputted two
channels of audio data based on equalizing characteristic data, and the adjusted digital signal is
used for the high range speaker, the middle range speaker, and the low range. A total of eight
digital signals of two channels (R channel and L channel) are generated for the speaker and the
subwoofer, and filtering and alignment (under the control of the controller 11) are performed on
each of these eight channel signals. It performs surround processing such as delay time) and
outputs it to the D / A converter (DAC) 5.
The DSP 4 adjusts the sound quality of the reproduced sound to be reproduced.
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[0019]
The DSP 4 is provided with a parametric equalizer (Parametric Equalizer) having a plurality of
(for example, 5 each corresponding to R channel and L channel) peaking equalizer (Peaking
Equalizer), each peaking equalizer The gain of each frequency band is adjusted based on the
equalizing characteristic data.
[0020]
The DSP 4 also adjusts the passband frequency (cutoff frequency), frequency bandwidth
(crossover), and gain for each of the four frequency bands for high range, middle range, low
range, and subwoofer. And the parameters of each filter circuit are adjusted for sound quality
correction adjustment of the reproduced sound.
[0021]
The D / A converter 5 converts each of the 8-channel digital signals output from the DSP 4 into
an analog signal and outputs the analog signal to the electronic volume 6.
The electronic volume 6 individually adjusts the gains of the input eight analog signals under the
control of the controller 11, and outputs the gains to the analog output terminal unit 8 through
the mute circuit 7.
[0022]
On the other hand, the mute circuit 7 mutes all eight analog signals under the control of the
controller 11 or outputs the mute signal as it is.
That is, muting of all channels is performed by the mute circuit 7, and individual volume
adjustment for each channel is performed by the electronic volume 6.
[0023]
In addition to the digital audio source, the on-vehicle audio device 1 further includes a tuner 9 as
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an analog audio source.
The tuner 9 receives broadcast radio waves such as radio broadcasts and outputs an analog
signal. The analog signal is input to the DSP 4 through the selector 10.
The DSP 4 incorporates an A / D conversion circuit (not shown), converts an analog signal into a
digital signal when it is input, and applies various sound field effects as described above to the D
/ A converter. Output to 5
The selector 10 selects an analog audio source signal to be input to the DSP 4 under the
instruction of the controller 11.
[0024]
The on-vehicle audio device 1 also includes an external device connection terminal 16 as a
terminal for transmitting and receiving data to and from the external device.
[0025]
FIG. 2 is a block diagram showing the configuration of the controller 11.
[0026]
The controller 11 includes a central processing unit (CPU) 30, a random access memory (RAM)
31, and an electrically erasable and programmable ROM (EEPROM) 32 as a memory. The CPU 30
adjusts the tone according to a control program stored in the EEPROM 32. It centrally controls
the operation of the on-vehicle audio device 1 including the device 20.
Here, the EEPROM 32 is an electrically rewritable non-volatile memory.
Although the case of the EEPROM 32 will be described below as the memory, the present
invention is not limited to this, and may be, for example, a ROM.
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[0027]
The RAM 31 is a memory for temporarily storing control programs and data read from the
EEPROM 32 by the CPU 30.
Further, the control program and various data are stored in the EEPROM 32.
[0028]
In the EEPROM 32 of the controller 11, room acoustic characteristic data (hereinafter referred to
as "real room acoustic characteristic data") 32A measured in advance of the actual vehicle
interior is stored (real room acoustic characteristic storage means).
That is, the EEPROM 32 stores actual room acoustic characteristic data 32A in a vehicle interior
in which a speaker (not shown) connected to the on-vehicle audio device 1 is installed.
[0029]
The actual room acoustic characteristic data 32A is measured, for example, by providing a
microphone (not shown) in a vehicle cabin (for example, a seat etc.), outputting a predetermined
sound from each speaker (not shown) and collecting the sound by the microphone. Ru.
[0030]
Further, the EEPROM 32 of the controller 11 indicates music-specific equalizing characteristic
data (hereinafter referred to as "music-specific EQ characteristic data") corresponding to music
type data indicating the type of music (for example, music genre or label). Table data 32B is
stored in advance (table data storage means).
The genre of music is, for example, pops, jazz, classical music, rock and the like. The musicspecific EQ characteristic data is set to be a suitable reproduction sound in the vehicle interior.
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[0031]
Further, in the EEPROM 32, preset equalizing characteristic data (EQ characteristic data) 32C
which is set to have an average equalizing curve corresponding to all kinds of music is stored in
advance.
[0032]
The preset EQ characteristic data 32C, for example, is read from the EEPROM 32 by the CPU 30
at the time of initialization after the power is turned on, and is output to the DSP 4 as a digital
signal.
The DSP 4 inputs a digital signal indicating preset EQ characteristic data 32C, and adjusts the
level of each frequency band of the reproduced sound based on the audio data based on the
inputted preset EQ characteristic data 32C.
[0033]
By the way, in reproducing the audio data recorded on the CD 21, the sound quality adjustment
suitable for the music genre, the label, and the acoustic characteristics in the vehicle
compartment are different. Therefore, even if the sound quality is adjusted in the DSP 4 based on
the preset EQ characteristic data 32C, the sound quality suitable for the music and the passenger
compartment can not always be obtained.
[0034]
Therefore, in the present embodiment, the sound quality adjustment device 20 adjusts the sound
quality of the reproduction sound based on the audio data recorded in the CD 21 so as to be
suitable for the reproduction music and the vehicle interior.
[0035]
Specifically, when the sound quality adjustment apparatus 20 records the proper equalizing
characteristic data (hereinafter referred to as “appropriate EQ characteristic data”) 21A in
addition to the audio data, the CD 21 inserted in the CD drive 2 The sound quality of the
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reproduced sound based on the audio data of the CD 21 is adjusted to be suitable for the
reproduced music and the vehicle interior.
The appropriate EQ characteristic data 21A is set to have a sound quality suitable for
reproducing audio data under an ideal indoor environment without echo or attenuation of sound.
[0036]
The proper EQ characteristic data 21A is recorded on the CD 21 as header information. When
such header information is recorded, the header information is read prior to reading the audio
data.
[0037]
FIG. 3 is a flowchart showing the control processing operation of the CPU 30 when the CD 21 is
inserted into the CD drive 2.
[0038]
First, when the CD 21 is inserted into the CD drive 2 (step S1), the CPU 30 determines whether
the proper EQ characteristic data 21A is recorded in the CD 21 (step S2).
Specifically, the CPU 30 determines whether the CD drive 2 has read the proper EQ characteristic
data 21A from the CD 21 or not.
[0039]
In step S2, when the proper EQ characteristic data 21A is recorded on the CD 21 (step S1; Yes),
that is, when the CD drive 2 reads the proper EQ characteristic data 21A from the CD 21, the
CPU 30 stores real room sound in the EEPROM 32. It is determined whether the characteristic
data 32A is stored (step S3).
[0040]
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If the real room acoustic characteristic data 32A is stored in the EEPROM 32 (step S3; Yes), the
CPU 30 reads the real room acoustic characteristic data 32A from the EEPROM 32 (step S4).
[0041]
Here, when the sound quality of the reproduced sound based on the audio data recorded in the
inserted CD 21 is adjusted based on the proper EQ characteristic data 21A, the proper sound
quality can not always be obtained in the vehicle interior.
[0042]
Therefore, in the present embodiment, when the proper EQ characteristic data 21A is recorded in
the CD 21, the proper EQ characteristic data 21A read from the CD 21 is corrected based on the
real room acoustic characteristic data 32A, and the corrected EQ characteristic data 21A is
corrected. The proper EQ characteristic data (hereinafter, referred to as “correction proper EQ
characteristic data”) is output to the DSP 4.
[0043]
More specifically, the CPU 30 first calculates the difference between the proper EQ characteristic
data 21A read from the CD 21 and the real room acoustic characteristic data 32A read from the
EEPROM 32 (step S5).
Then, the CPU 30 sets this difference calculation result as the correction proper EQ characteristic
data (step S6).
[0044]
Here, FIG. 4 is an explanatory view showing an example of the frequency characteristics of the
proper EQ characteristic data 21A and the real room acoustic characteristic data 32A, and FIG.
FIG.
[0045]
As shown in FIG. 4, the CPU 30 calculates the difference between each frequency component of
the proper EQ characteristic data 21A and each frequency component of the real room acoustic
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characteristic data 32A.
That is, the CPU 30 subtracts each frequency component of the real room acoustic characteristic
data 32A from each frequency component of the appropriate EQ characteristic data 21A to
obtain the correction appropriate EQ characteristic data X as shown in FIG.
The CPU 30 temporarily stores the correction proper EQ characteristic data X thus calculated in
the RAM 31.
[0046]
Next, the CPU 30 outputs the correction proper EQ characteristic data X to the DSP 4 (step S7).
[0047]
The DSP 4 to which this correction proper EQ characteristic data X is input is set to the
correction proper EQ characteristic data X, and the level of each frequency band of the
reproduced sound based on the audio data of the CD 21 is based on the correction proper EQ
characteristic data X A reproduction process is performed to adjust the sound quality by
adjusting (step S8).
[0048]
When the reproduction based on the audio data of the CD 21 is completed, the CPU 30 outputs
the preset EQ characteristic data 32C to the DSP 4, and the DSP 4 is set to the preset EQ
characteristic data 32C.
[0049]
Therefore, the proper EQ characteristic data 21A read out from the CD 21 is corrected based on
the real room acoustical characteristic data 32A, and the proper EQ characteristic data for
correction, which is the EQ characteristic data after this correction, is outputted to the DPS In the
actual cabin where the reproduced sound is output, it is possible to automatically obtain the
same sound quality as when the sound is emitted under an ideal indoor environment without the
user operating it.
[0050]
If the proper EQ characteristic data is not recorded in the CD inserted in the CD drive 2 in step S2
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(step S2; No), the DSP 4 is based on the audio data of the CD based on the preset EQ
characteristic data 32C. A reproduction process is performed to adjust the sound quality of the
reproduction sound (step S8).
[0051]
When the real room acoustic characteristic data 32A is not stored in the EEPROM 32 in step S3
(step S3; No), the CPU 30 records music type data corresponding to the audio data recorded in
the CD in the CD. It is determined whether or not there is (step S9).
[0052]
When the music type data corresponding to the audio data recorded in the CD is recorded in the
CD (step S9; Yes), the CPU 30 reads the music type data recorded in the CD (step S10), The
music-specific EQ characteristic data corresponding to the music type data is read out from the
table data 32B of the EEPROM 32 (step S11).
Then, the CPU 30 outputs the music-specific EQ characteristic data to the DSP 4 (step S12).
[0053]
By this, the DSP 4 inputs this music-specific EQ characteristic data, is set to the music-specific EQ
characteristic data, and performs reproduction processing to adjust the sound quality of the
reproduced sound based on the audio data of the CD based on the music-specific EQ
characteristic data. (Step S8).
Therefore, it is possible to automatically obtain the music type data read from the CD and the
sound quality suitable for the vehicle interior environment without the user operating the sound
quality adjustment apparatus 20.
[0054]
When the reproduction based on the audio data of the CD is completed, the CPU 30 outputs the
preset EQ characteristic data 32C to the DSP 4, and the DSP 4 is set to the preset EQ
characteristic data 32C.
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[0055]
In step S9, when the music type data is not recorded in the CD (step S9; No), the CPU 30 outputs
the proper EQ characteristic data read from the CD to the DSP 4 (step S13).
[0056]
Thus, the DSP 4 receives the proper EQ characteristic data, sets the proper EQ characteristic
data, and performs a reproduction process to adjust the sound quality of the reproduced sound
based on the audio data of the CD based on the proper EQ characteristic data (step S8). ).
[0057]
As described above, according to the present embodiment, the CPU 30 determines whether or
not the proper EQ characteristic data 21A corresponding to the audio data to be reproduced is
recorded in the CD 21, and when the proper EQ characteristic data 21A is recorded, Since each
frequency component of the real room acoustic characteristic data is subtracted from each
frequency component of the appropriate EQ characteristic data 21A read from the CD 21 to
calculate the correction appropriate EQ characteristic data used for adjustment, the read
appropriate EQ characteristic data 21A is corrected to the correct EQ characteristic data for
correction corresponding to the passenger compartment, and the DSP 4 adjusts the sound quality
using this correct EQ characteristic data for correction, so the sound quality is automatically
correct automatically without the user's operation. Can be
[0058]
As mentioned above, although the present invention was explained based on one embodiment,
the present invention is not limited to this.
[0059]
For example, although the above-mentioned embodiment explained a case where sound quality
adjustment device 20 was applied to in-vehicle audio device 1, it is possible to apply not only to a
vehicle interior but also to an audio device installed in a building.
[0060]
In the above embodiment, when the proper EQ characteristic data is not recorded in the CD, the
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DSP 4 adjusts the sound quality based on the preset EQ characteristic data. However, the present
invention is not limited to this. When the EQ characteristic data is not recorded but the music
type data corresponding to the audio data of the CD is recorded, the DSP 4 is based on the music
type EQ characteristic data corresponding to the music type data recorded in the CD. The sound
quality may be adjusted.
By this, sound quality can be adjusted more appropriately.
[0061]
In the above embodiment, the CD 21 is described as the recording medium on which the audio
data is recorded, but the recording medium on which the audio data is recorded is not limited to
this, and may be an optical disc such as a DVD or an MD, a hard disk Or the like, or a memory
card or the like.
[0062]
In the above embodiment, the control program of the in-vehicle audio apparatus 1 is stored in
the EEPROM 32. However, the control program is recorded in advance on recording media such
as various magnetic disks, optical disks, and memory cards. It is also possible to configure to read
from media and install.
It is also possible to provide a communication interface, download the control program via a
network such as the Internet, a LAN, etc., and install and execute the control program.
[0063]
It is a block diagram showing functional composition of a car audio system concerning this
embodiment.
It is a block diagram showing composition of a controller.
It is a flowchart which shows control processing operation of CPU.
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It is explanatory drawing which shows an example of the frequency characteristic of reference |
standard room acoustic property data and real room acoustic property data.
It is explanatory drawing which shows the frequency characteristic of a difference calculation
result.
Explanation of sign
[0064]
DESCRIPTION OF SYMBOLS 1 in-vehicle audio apparatus (audio apparatus) 4 DSP (adjustment
means) 11 controller 20 sound quality adjustment apparatus 21 CD (recording medium) 21A
appropriate equalization characteristic data 30 CPU (judgment means, calculation means)
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