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JP2007258881

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DESCRIPTION JP2007258881
An object of the present invention is to realize sound field adjustment according to a vehicle type
with an easy and simple configuration. In an on-vehicle audio reproducing apparatus, parameters
of sound field processing such as equalization and time alignment corresponding to different
vehicle interior spaces are provided by, for example, a two-dimensional code image such as a QR
code. The user causes the two-dimensional code image to be captured, and causes the audio
reproduction device to load the audio setting data Dq included in the two-dimensional code
image (F101 to F104). In the audio reproduction apparatus, setting of processing parameters is
performed based on the acquired audio setting data Dq (F105). [Selected figure] Figure 7
Automotive audio reproduction system, automotive audio reproduction apparatus, audio
reproduction method
[0001]
The present invention relates to an on-vehicle audio reproduction system, an on-vehicle audio
reproduction apparatus, and an audio reproduction method thereof.
[0002]
Japanese Patent Publication No. 59-27957 JP-A-4-236599 JP-A-4-299398 JP-A-9-62271 JP-A10-307592 JP-A-5-20945
[0003]
08-05-2019
1
When listening to music etc. in a car with an on-vehicle audio playback device, the arrival time of
the audio signal at the listening point is disturbed due to either the left or right listening position
or the different car interior space or speaker position for each car type Occurs.
In addition, due to differences in generation of inherent standing waves different from vehicle
type and reverberation characteristics, the frequency characteristics are also significantly
disturbed compared to a listening room or the like in a house.
For this reason, in order to perform more comfortable sound reproduction, it is necessary to
optimize the disturbance of the sound field in the car.
[0004]
For example, the following method has been implemented or proposed. First, there is a method in
which the user adjusts the equalizer and time alignment functions provided in the audio
reproduction apparatus by hearing. In addition, according to the difference in the distance to the
listening point from the speaker of each channel, time alignment gives time delay to the speaker
output sound, and the disturbance of the arrival time of the sound from the speaker of each
channel to the user who is at the listening point To correct. Alternatively, a microphone may be
installed at the listening point to measure the sound field, and the user may calculate an optimal
adjustment value, or in some cases, automatically measure it with an audio reproduction device
and reflect it on a set value.
[0005]
In addition, on a website such as a manufacturer of an in-vehicle audio reproducing apparatus as
an internet website, the user is notified of the audio setting for each vehicle type to the user, and
the setting value presented by the user according to the vehicle type of his own vehicle There is
also a method of adjusting to There is also a method in which setting values for each vehicle type
are stored inside a vehicle-mounted audio reproduction device, and a user switches the setting
according to the vehicle type or automatically determines the vehicle type and switches the
setting. In addition, audio setting values corresponding to various vehicle types are recorded in a
recording medium such as a CD-ROM (Compact Disc-Read Only Memory), memory card, etc., and
the audio reproducing apparatus performs audio setting values corresponding to the vehicle
type. There is also a method of reading and setting. In addition, audio setting values
08-05-2019
2
corresponding to the vehicle type are downloaded from an Internet website or the like, and the
information of the audio setting values downloaded by the user is recorded in the recording
medium. There is also a method in which the audio reproducing apparatus reads and sets audio
setting values from the recording medium.
[0006]
However, the conventional methods as described above have the following problems. When the
user adjusts by hearing, it is often very difficult without experience in tuning the sound field
characteristics, and in the case of many general users, it is actually impossible to make
appropriate adjustments. In addition, when the audio reproducing apparatus measures a sound
field using a microphone, the audio reproducing apparatus needs to incorporate an expensive
arithmetic unit or a microphone, resulting in an increase in cost and complexity of the product.
There is also the trouble of making measurements in the car at the user side. In addition, when
introducing audio setting values for adjusting the sound field characteristics on the Internet,
there is a trouble that the user confirms it with a personal computer or the like, and a trouble
that the adjustment operation is performed according to the confirmed contents. When
downloading an audio setting value via the Internet, it takes time and effort for downloading and
recording the downloaded audio setting value on a recording medium and bringing it into an
audio reproducing apparatus, and the audio reproducing apparatus also uses the recording
medium A mechanism for handling is needed. For example, when the audio setting value for
performing sound field adjustment corresponding to cars around the world is recorded in the
internal memory of the audio reproducing apparatus, the amount of data to be stored becomes
too large and each user needs it. Data is usually only one or a few of the data for all car types,
and unnecessary data for the user is stored using expensive memory, which is disadvantageous
in terms of product cost and configuration There is. Even in the case of storing audio setting
values corresponding to a large number of vehicle types in a recording medium such as a CDROM or a memory card and distributing this to each user, it is said that most of the information
is unnecessary for each user. In terms of distributing points and recording media (for example,
bundled with an audio playback device), it is wasteful and can not cope with new car models.
[0007]
In view of the above, it is an object of the present invention to realize an audio setting according
to the type of vehicle with less burden on the configuration of the audio reproduction apparatus
and easily realized by the user.
[0008]
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3
The on-vehicle audio reproduction system according to the present invention is an information
image in which audio setting data corresponding to a vehicle type is recorded, and is an
information image displayed on a sheet or screen, and an information image reading unit for
reading the information image A setting data acquisition unit for acquiring audio setting data
recorded in the information image read by the information image reading unit; and an audio
signal processing unit for performing signal processing for audio output on an audio signal
supplied from an audio source And a setting control unit configured to set the signal processing
of the audio signal processing unit based on the audio setting data acquired by the setting data
acquisition unit.
The information image is, for example, a two-dimensional code image or the like, and represents
information (audio setting data) by, for example, a code image appearing on a paper surface or a
screen.
[0009]
The on-vehicle audio reproducing apparatus according to the present invention is an information
image (for example, a two-dimensional code image) in which audio setting data corresponding to
a vehicle type is recorded, and is an audio recorded on the information image displayed on a
sheet or screen Based on a setting data acquisition unit for acquiring setting data, an audio signal
processing unit for performing signal processing for audio output on an audio signal supplied
from an audio source, and audio setting data acquired by the setting data acquisition unit And a
setting control unit for setting the signal processing of the audio signal processing unit. Further,
the setting data take-in unit is configured as an interface unit capable of communicating with an
information image reading apparatus for reading the information image, and takes in the audio
setting data through communication with the information image reading apparatus. Alternatively,
the apparatus further comprises an information image reading unit for reading the information
image, and the setting data take-in unit decodes the information image read by the information
image reading unit to take in the audio setting data. Further, the audio signal processing unit
performs equalization processing of an audio signal as signal processing for audio output, and
the setting control unit controls the audio based on the audio setting data fetched by the setting
data fetching unit. The equalization processing coefficient of the signal processing unit is set. The
audio signal processing unit performs delay processing for time alignment on each audio signal
of a plurality of channels as signal processing for audio output, and the setting control unit is
received by the setting data receiving unit. The delay time setting of the delay processing of the
audio signal processing unit is performed based on the audio setting data.
08-05-2019
4
[0010]
The audio reproducing method of the in-vehicle audio reproducing apparatus according to the
present invention is an information image in which audio setting data corresponding to a car
type is recorded, and the audio setting data read from the information image displayed on a
sheet or screen is The above setting for the setting data fetching step, the setting step for setting
the signal processing for audio output based on the audio setting data loaded in the setting data
fetching step, and the audio signal supplied from the audio source And an output step of
performing signal processing by setting in the step and reproducing and outputting an audio
signal.
[0011]
In the case of the present invention described above, in order to optimize the sound field
parameters (audio setting data) such as equalizing and time alignment to the listening point, in
the in-vehicle audio reproducing apparatus, corresponding to the vehicle interior space different
for each vehicle type. For example, an information image represented by a two-dimensional code
image such as a QR code is used.
In the information image, it is assumed that audio setting data for adjusting the sound field in the
passenger compartment of one vehicle type is recorded. The user can use such an information
image as an information image reading unit (an information image reading device separate from
the information reproduction device (such as an audio reproduction device) or an information
image prepared in accordance with the type of automobile equipped with the on-vehicle audio
reproduction device. , And read by the information image reading unit mounted on the audio
reproduction apparatus. Then, audio setting data obtained from the read information image is
taken into the in-vehicle audio reproducing device, and processing parameters etc. are set based
on the taken-in audio setting data in the audio signal processing unit of the in-vehicle audio
reproducing device. To be done.
[0012]
According to the present invention, it is possible to execute the audio setting of the on-vehicle
audio reproducing device according to the vehicle type, for example, the setting of the equalizing
filter coefficient and the time alignment adjustment by the user with a simple operation. For
08-05-2019
5
example, it is only necessary to read an information image prepared corresponding to one's own
car so that the audio setting data recorded in the information image can be taken into the onvehicle audio reproducing apparatus. And by this, high quality audio reproduction according to a
vehicle type is realized. In addition, information images such as two-dimensional code images can
be represented on a sheet of paper or a screen, and various states such as car brochures,
advertisements, magazines, Internet websites, instruction manuals for car audio reproduction
devices, etc. Distribution, and it is easy for each user to find an information image corresponding
to his own car and read the information image. Further, by using the information image as
described above, there is no burden of storing large-capacity audio setting data corresponding to
many vehicle types in the on-vehicle audio reproducing apparatus.
[0013]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the in-vehicle audio reproduction
system, the in-vehicle audio reproduction apparatus, and the audio reproduction method thereof
according to the present invention will be described below in the following order. [1. First
embodiment] [2. Second embodiment] [3. Effects and Modifications of the Embodiment]
[0014]
[1. First Embodiment] FIG. 1 shows components of a vehicle-mounted audio reproduction
system according to a first embodiment. The on-vehicle audio reproduction system includes an
audio reproduction device 1 actually mounted on a vehicle, a two-dimensional code image 2
displayed on a sheet or a screen, and a code reader 3.
[0015]
The two-dimensional code image 2 is image information known as, for example, a QR code, a
data matrix, a maxi code, etc., and is obtained by converting the information into a black and
white two-dimensional pattern. For example, in the case of a QR code, information of up to 2.9
KBytes can be recorded. In the case of this example, for example, audio setting data Dq
corresponding to a vehicle type is stored in the two-dimensional code image 2 as a QR code.
Although described later, the audio setting data Dq indicates, as audio signal processing in the
audio reproduction device 1, filter coefficients of equalizing processing for sound field
adjustment matched to the vehicle interior space of a car and delay time values of time alignment
08-05-2019
6
adjustment. It is data. Since such sound field adjustment differs depending on the vehicle interior
space, the speaker arrangement, etc., the audio setting data Dq will be different data according to
the type of car (vehicle cabin shape and speaker position). Then, for example, one audio setting
data Dq is recorded in one two-dimensional code image 2. That is, one two-dimensional code
image 2 corresponds to a car of a specific car type. For example, as shown in FIG. 2, such a twodimensional code image 2 is printed or attached on a sheet 5 such as a catalog of a car, a
magazine, a pamphlet, a poster or the like. That is, it is provided to the general user as a twodimensional code image 2 corresponding to a certain vehicle type on the paper surface 5. Of
course, the two-dimensional code image 2 may be printed or attached to any book or document.
For example, a two-dimensional code image 2 may be posted corresponding to each vehicle type
in the instruction manual of the audio reproduction device 1, or may be a newspaper page, an
advertisement, direct mail, or the like. Furthermore, a large number of two-dimensional code
images 2 corresponding to the vehicle type may be posted on the Internet homepage, and the
user may be able to view the two-dimensional code image on the display screen with a personal
computer system etc. A two-dimensional code image provided on a home page screen or the like
may be printed out and viewed. In any case, as the two-dimensional code image 2 is on the paper
surface or on the display screen, the user sees the two-dimensional code image 2 according to
the type of his / her car (a car equipped with the audio playback device 1) The form of provision
may be any as long as it can be provided.
[0016]
The code reader 3 is a device that reads by capturing a two-dimensional code image 2 and
decodes an image signal read by capturing to obtain information recorded as the twodimensional code image 2, that is, audio setting data Dq It is. Mobile phones with cameras and
PDAs (Personal Digital Assistants) with cameras and the like, which are in widespread use in
recent years, have a function of reading a two-dimensional code image 2 such as a QR code.
Therefore, a portable telephone owned by the user may be used as the code reader 3. Of course,
the code reader 3 intended for use in this system may be used instead of a portable telephone or
the like.
[0017]
The audio playback device 1 is an on-vehicle audio playback device attached to a front console of
a car, and has, for example, a playback function of an audio disc such as a CD (Compact Disc) or a
mini disc, a radio tuner function, etc. Is a device for outputting reproduced sound such as music
from a speaker arranged in
08-05-2019
7
[0018]
In this example, the sound field adjustment setting according to the vehicle interior space is
performed so that the music and the like reproduced and output by the audio reproduction
device 1 can be heard in a good state in the vehicle.
In order to adjust the sound field, the user may perform a simple procedure as shown in FIG.
First, the user searches for a two-dimensional code image 2 corresponding to the type of car
equipped with the audio reproduction device 1. For example, the two-dimensional code image 2
published in the page 5 such as a catalog or a brochure is searched. Alternatively, the Internet
search is performed to search for a two-dimensional code image 2 corresponding to the type of
the vehicle, which is published on the homepage of a car maker or an audio equipment maker.
Then, as shown in FIG. 3A, the two-dimensional code image 2 is captured by the code reader 3
(for example, a mobile phone). The code reading device 3 decodes the captured two-dimensional
code image 2 and stores audio setting data Dq according to the type of vehicle inside the device.
Thereafter, the user brings the code reader 3 into a car, and as shown in FIG. 3B, connects the
code reader 3 with the audio reproducing device 1 with the predetermined cable 4. Data
communication is performed by connecting the code reader 3 and the audio reproduction device
1, and the audio setting data Dq internally stored in the code reader 3 is transferred to the audio
reproduction device 1. Alternatively, as shown in FIG. 3C, the code reading device 3 and the
audio reproducing device 1 are wirelessly connected to perform data communication so that the
audio setting data Dq is transferred to the audio reproducing device 1. It is also good. Wireless
communication can be realized by, for example, infrared communication, Bluetooth
communication, or the like. After the audio setting data Dq is taken in from the code reading
device 3 in the audio reproduction device 1, parameters for internal audio signal processing are
set based on the audio setting data Dq. That is, the filter coefficient of the equalizing process and
the delay time of the audio signal of each channel for time alignment adjustment are set. As a
result, in the audio reproduction device 1, the optimum sound field adjustment is realized
according to the type of the car, that is, the shape of the cabin space, the arrangement of the
speakers, and the like.
[0019]
Hereinafter, an apparatus configuration and processing examples for realizing such sound field
adjustment will be described. FIG. 4 shows an example of the configuration of the main part of
the code reader 3. As described above, a portable telephone can be used as the code reader 3.
For example, in the case of a portable telephone, in addition to the general configuration as a
08-05-2019
8
portable telephone, the reading and transmission of the two-dimensional code image 2 of FIG. It
is sufficient to have a configuration for the In addition, a dedicated code reader 3 having only the
configuration of FIG. 4 may be used. The code reading device 3 includes a control unit 31, an
imaging unit 32, a decoding unit 33, a memory unit 34, a data communication interface unit 35,
an operation unit 36, and a display unit 37.
[0020]
The control unit 31 includes, for example, a CPU (Central Processing Unit), and performs an
imaging operation of the two-dimensional code image 2 and a transmission operation of the
audio setting data Dq recorded as the two-dimensional code image 2 according to the operation
program and operation input. Control each part to The memory unit 34 stores program code to
be executed in the control unit 31, is used for temporarily storing work data being executed, and
decodes audio setting data Dq decoded from the captured two-dimensional code image 2 Store.
In the case of this figure, the memory unit 34 is illustrated as including both volatile memory and
non-volatile memory. For example, it includes nonvolatile memories such as a ROM (Read Only
Memory) for storing a program, an arithmetic work area, a RAM (Random Access Memory) for
various types of temporary storage, and an EEPROM (Electrically Erasable and Programmable
Read Only Memory).
[0021]
The imaging unit 32 performs sampling, gain adjustment, video signal processing (brightness
processing, color processing, correction) on an image signal captured by an imaging optical lens
system, a lens drive system, an imaging device unit such as a CCD sensor or a CMOS sensor, and
an imaging device unit. It is formed by mounting an imaging signal processing circuit or the like
that performs processing etc.), and outputs image data by an imaging operation. The imaging
unit 32 captures an image of the two-dimensional code image 2. The decoding unit 33 decodes
the image data of the two-dimensional code image 2 captured by the imaging unit 32 according
to the code format, and performs audio setting for a certain vehicle type recorded as the twodimensional code image 2 Obtain data Dq. The audio setting data Dq decoded by the decoding
unit 33 is supplied to the control unit 31 and stored in, for example, a non-volatile memory area
of the memory unit 34.
[0022]
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9
The operation unit 36 includes operators such as various operation keys for the user's operation.
The operation unit 36 is provided with at least an operator for an imaging operation. The display
unit 37 displays, for example, an operation menu and monitor display at the time of imaging by
the imaging unit 32. For example, when the user performs an operation of setting the imaging
mode using the operation unit 36, the control unit 31 causes the imaging unit 32 to start the
image capturing process. At this time, the image signal captured by the imaging unit 32 is
supplied to the display unit 37 and displayed on a monitor. The user views the two-dimensional
code image 2 as a subject as shown in FIG. Then, a state in which the two-dimensional code
image 2 is a subject is confirmed, and an imaging operation (so-called shutter operation) is
performed by the operation unit 32. At this time, the control unit 31 causes the imaging unit 32
to supply the image data at that time (a still image of one frame obtained by imaging the twodimensional code image 2) to the decoding unit 33 as imaged image data. Then, the audio setting
data Dq decoded by the decoding unit 33 is fetched.
[0023]
The data communication interface unit 35 is an interface unit for transmitting the audio setting
data Dq to the audio reproduction apparatus 1 in a wired or wireless manner as shown in FIG. 3
(b) or 3 (c). For example, data transmission with the audio reproduction device 1 is enabled by a
predetermined interface standard such as USB or IEEE 1394. Alternatively, it may be a
communication unit such as infrared transmission and Bluetooth communication.
[0024]
Subsequently, FIG. 5 shows a configuration example of the audio reproduction device 1. In the
audio reproducing apparatus 1, the controller 10 is constituted by, for example, a CPU, and
according to an operation program or an operation input, audio reproduction, communication
processing with the code reader 3, signal processing setting based on audio setting data Dq
Control each part for The memory unit 11 stores program code to be executed in the controller
10, is used to temporarily store work data being executed, and stores audio setting data Dq
received from the code reader 3. In the case of this figure, the memory unit 11 is illustrated as
including both volatile memory and nonvolatile memory. For example, it includes a ROM for
storing a program, a calculation work area, a RAM for various temporary storage, and a nonvolatile memory such as an EEP-ROM.
08-05-2019
10
[0025]
The operation unit 12 includes operation keys such as various operation keys and a dial disposed
on the front panel of the audio reproduction device 1. The user can use the operation unit 12 to
perform channel selection operations such as audio mode (source switching) operation, volume
(volume) operation, sound quality operation, disc playback operation, fast forward / reverse
operation, quick start operation, radio broadcast, etc. Ru. Further, as shown in FIGS. 3 (b) and 3
(c), an operation element 12a for taking in the audio setting data Dq at the time of
communication is provided. The controller 10 controls the operation instructed by the user to be
executed based on the operation information of the operation unit 12. The display unit 13 is, for
example, a display unit using a liquid crystal panel, and is provided on the front panel of the
audio reproduction device 1 as shown in FIGS. 3 (b) and 3 (c). In this display unit 13, under
control of the controller 10, audio mode display, display showing operation such as reproduction
or fast forward, spectrum analyzer display, volume level display, track number of music being
reproduced, etc. are received. The display of the broadcast station is performed.
[0026]
The disk reproduction unit 15, the tuner unit 16, and the external input unit 17 are shown as
sources of audio signals to be reproduced and output. The selector 18 is a circuit that selects the
source of these audio signals. In addition to the above, an HDD (Hard Disc Drive) storing music or
the like, a memory card reader for reproducing an audio signal from a memory card, or the like
may be provided as a source of the audio signal.
[0027]
The disk reproducing unit 15 is, for example, a reproducing device unit for an optical disk such
as a CD (Compact Disc) / DVD (Digital Versatile Disc) or a reproducing device unit for an optical
disk / magneto-optical disk such as a mini disk. When the user performs an operation related to
disc reproduction from the operation unit 12, the controller 10 causes the disc reproduction unit
15 to start the reproduction operation or execute an operation (such as a cue search)
corresponding to the operation. When reproduction is performed by the disk reproduction unit
15, the controller 10 controls the selector 18 to select the disk reproduction unit 15. Then, the
audio signal reproduced from the disc by the disc reproducing unit 15 is supplied to the DSP
(Digital Signal Processor) 14 through the selector 18 as digital data.
08-05-2019
11
[0028]
The tuner unit 16 is a broadcast receiver such as a radio broadcast, and performs reception /
demodulation of a broadcast wave. When the tuner unit 16 receives a broadcast, the controller
10 controls the selector 18 to select the tuner unit 16. Then, the audio signal demodulated by the
tuner unit 16 is converted into digital data, and is supplied to the DSP 14 through the selector
18.
[0029]
The external input unit 17 is a circuit unit that inputs an audio signal from an external device,
such as a changer system or a navigation device, which is also mounted in the vehicle. When the
external input unit 17 is designated as the source by the user operation, the controller 10
controls the selector 18 to select the external input unit 17. The audio signal (digital data) input
from the external device by the external input unit 17 is supplied to the DSP 14 via the selector
18.
[0030]
The DSP 14 performs various signal processing on the output audio signal. For example,
equalization, time alignment processing, channel divide processing, sound effect processing,
volume processing, etc. are performed. As equalization, processing based on user operation of
the operation unit 12 is performed, but processing for sound field correction based on the audio
setting data Dq is also performed.
[0031]
The DSP 14 performs various audio signal processing to output, for example, 4-channel audio
signals output from a 4-channel speaker. The audio signal of each channel is converted to an
analog signal by D / A converters 19a, 19b, 19c and 19d, and then amplified by amplifier units
20a, 20b, 20c and 20d, respectively, and speakers 21a, 21b, 21c and 21d. Is output as voice
from. The speakers 21a, 21b, 21c and 21d are disposed in the vehicle as, for example, a front
right speaker, a front left speaker, a rear right speaker, and a rear left speaker.
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[0032]
The data communication interface unit 22 is a unit that performs wired or wireless
communication with the data transmission interface unit 35 of the code reader 3 described
above, and has, for example, a predetermined standard such as USB, IEEE 1394, infrared
communication, or Bluetooth communication. It is considered as a communication interface unit.
[0033]
In such an on-vehicle audio reproduction apparatus 1, the DSP 14 performs processing for
equalization and time alignment adjustment as sound field adjustment suitable for the cabin
space.
FIG. 6A shows an example of the equalizer filter implemented in the DSP 14. Here, a one-band
filter configuration as an equalizer is shown. This filter is a second-order IIR (Infinite Impulse
Response) filter including one-sample delay units 51, 42, 53, 54, coefficient multipliers 55, 56,
57, 58, 59, and an adder 60. . In this one-band IIR filter, the coefficients a0, a1, a2, b1, b2 of the
coefficient multipliers 55, 56, 57, 58, 59 are variably set by the control of the controller 10. For
example, assuming that such an IIR filter is mounted 7 units in the DSP 14 to perform 7 bands of
equalization, 35 coefficients of 5 × 7 bands are required to perform frequency characteristic
adjustment suitable for the vehicle interior space The coefficient of the multiplier is variably set.
Assuming that the coefficients a0, a1, a2, b1 and b2 are each 3 bytes of data, 15 bytes are
required as the coefficient setting value of the filter of one band, and if it is a 7 band equalizer,
the coefficients of 105 bytes in total Setting value is required.
[0034]
FIG. 6B shows a processing system for time alignment adjustment, which is implemented in the
DSP 14. This is configured to give time delays to the audio signals outputted from the fourchannel speakers 21a, 21b, 21c, 21d by the delay units 71, 72, 73, 74, respectively. The delay
devices 71, 72, 73, 74 perform delay time setting control with 1 mm accuracy within a range of
4 m, for example, under control of delay time setting from the controller 10. For example, the
maximum length of the passenger compartment space as a passenger car is assumed to be 4 m
(in this case, a special vehicle such as a bus having a large passenger compartment space is
excluded). In order to perform time adjustment with the above-mentioned accuracy, it is
08-05-2019
13
sufficient if there is information of delay time value of 2 bytes or less per channel. In the case of
a 4-channel speaker system, it is 8 bytes of information by 2 × 4.
[0035]
For example, assuming that equalization and time alignment adjustment are performed according
to the vehicle interior space as described above, 105 bytes of information are given as the
equalizing coefficient set value, and 8 bytes of information are provided as delay time values for
time alignment adjustment. It should be given. That is, if there is 113 bytes of information
corresponding to one vehicle type, equalization and time alignment adjustment suitable for the
vehicle type can be performed. In this example, the code reading device 3 transmits the audio
setting data Dq to the audio reproduction device 1. The controller 10 performs equalizing
coefficient setting in the DSP 14 and delay time setting for time alignment adjustment based on
the audio setting data Dq. That is, the equalizing coefficient setting value and the delay time value
may be included as the audio setting data Dq as information of at least 113 bytes. The audio
setting data Dq is read from the two-dimensional code image 2. As described above, for example,
a QR code can record 2.9 K bytes of information. That is, the audio setting data Dq including the
equalizing coefficient setting value and the delay time value are recorded as sound field
adjustment data according to the vehicle interior space and the speaker arrangement for one
vehicle type by two-dimensional code image 2 such as QR code. It is fully possible to do.
[0036]
FIG. 7 shows a process in which the audio reproduction device 1 takes in the audio setting data
Dq read from the two-dimensional code image 2 and sets the equalizing coefficient setting value
and the delay time value supplied as the audio setting data Dq in the DSP 14. The process of FIG.
7 is executed when the code reading device 3 and the audio reproducing device 1 are in the
communicable state as shown in FIGS. 3 (b) and 3 (c).
[0037]
As described in FIG. 3A, the user obtains, for example, the two-dimensional code image 2
corresponding to the vehicle type of his own car as the two-dimensional code image 2 printed on
the sheet 5, and the code reader 3 The two-dimensional code image 2 is captured. At this time, in
the code reading device 3, the imaging signal of the two-dimensional code image 2 is decoded,
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and the audio setting data Dq is decoded and stored in the memory unit 34. After that, the user
brings the code reading device 3 into the car and makes it possible to communicate with the
audio reproduction device 1 as shown in FIGS. 3 (b) and 3 (c).
[0038]
The user operates, for example, a specific control 12 a in the audio reproduction device 1 in
order to take in the audio setting data Dq. The operator 12a is assumed to be an operation key or
the like for instructing acquisition of the audio setting data Dq. When an operation of taking in
the audio setting data Dq is performed as pressing of the operation element 12a or the like, the
controller 10 proceeds the process from step F101 to step F102 in FIG. In step F102, it is
determined whether a communication connection state is established with the code reader 3 via
the data communication interface unit 22. If it is not in the communication connection state, the
process is finished with the operation detected in step F101 as an invalid operation.
[0039]
In step F103, the controller 10 performs a process of receiving the audio setting data Dq. For
example, the transmission request of the audio setting data Dq is transmitted to the code reader
3 of the communication destination via the data communication interface unit 22. When the
control unit 31 receives a transmission request via the data communication interface unit 35 on
the code reading device 3 side, the audio setting data Dq stored in the memory unit 34 is read
out and supplied to the data communication interface unit 35. The encoding process of the
communication format is performed and transmitted to the audio reproduction device 1. In the
audio reproduction device 1, when the audio setting data Dq transmitted in this manner is
received by the data communication interface unit 22, the controller 10 takes in the audio setting
data Dq in step F104. Then, in step F105, the equalizing coefficient setting value and the delay
time value included in the audio setting data Dq are given to the DSP 14 to set the equalizing
coefficient and the time alignment delay time for sound field adjustment.
[0040]
By the above process, the setting for sound field adjustment in the audio reproduction device 1 is
completed based on the audio setting data Dq provided for each vehicle type as the twodimensional code image 2. After that, at the time of audio reproduction with the disc
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reproduction unit 15, the tuner unit 16 or the external input unit 17 as the source, the DSP 14
performs equalization processing and time alignment adjustment processing on the audio signal
by setting with the audio setting data Dq. Because the audio reproduction output is performed,
the reproduction sound is provided to the listener in the vehicle compartment in a state suitable
for the vehicle compartment space and the speaker arrangement position in the vehicle
compartment.
[0041]
[2. Second Embodiment] Next, a second embodiment will be described. The second
embodiment is an example in which the code reader 3 used in the first embodiment is not used.
FIG. 8 shows the configuration of the audio reproduction device 1. In the configuration of FIG. 8,
the same parts as those of FIG. The audio reproduction apparatus 1 shown in FIG. 8 is not
provided with the data communication interface unit 22 shown in FIG. 5, but is provided with an
imaging unit 23 and a decoding unit 24 instead.
[0042]
The imaging unit 23 performs sampling, gain adjustment, image signal processing (brightness
processing, color processing, correction) on an image signal captured by an imaging optical lens
system, a lens drive system, an imaging device unit such as a CCD sensor or a CMOS sensor, or
an imaging device unit. It is formed by mounting an imaging signal processing circuit or the like
that performs processing etc.), and outputs image data by an imaging operation. The imaging
unit 23 enables imaging of the two-dimensional code image 2. The decoding unit 24 decodes the
image data of the two-dimensional code image 2 captured by the imaging unit 23 according to
the code format, and obtains audio setting data Dq recorded as the two-dimensional code image
2. The audio setting data Dq decoded by the decoding unit 33 is supplied to the controller 10.
[0043]
As in the audio reproduction apparatus 1 according to the first embodiment, the operation unit
12 includes operators such as various operation keys for the user's operation, but the operation
of a specific operator is an imaging unit This is an operation to instruct 23 imaging. Similarly to
the first embodiment, the display unit 13 also performs necessary display as the audio
reproduction device 1, but in the case of the example of FIG. 8, a monitor at the time of imaging
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by the imaging unit 32. It is made to be able to display.
[0044]
FIG. 9A shows the audio reproduction device 1 disposed on the front console in the car, but an
imaging lens 23a of the imaging unit 23 is provided on the front panel. Further, a specific
operation key 23b on the front panel is used as an operation element for capturing an image.
[0045]
FIG. 10 shows a process of taking in the audio setting data Dq read from the two-dimensional
code image 2 in the audio reproducing apparatus 1 and setting the equalizing coefficient setting
value and the delay time value supplied as the audio setting data Dq in the DSP 14. .
[0046]
For example, when the user performs a specific operation such as pressing the operation key 23b
which is one operation element of the operation unit 12, the controller 10 recognizes that the
data acquisition mode by imaging is instructed, and the processing is performed in steps F201 to
F202. Advance to
In step F202, the controller 10 instructs the imaging unit 23 to start an imaging operation. Then,
in response to the start of imaging by the imaging unit 23, the display unit 13 causes the display
unit 13 to display the image signal captured by the imaging unit 32. The user brings the sheet 5
such as a pamphlet on which the two-dimensional code image 2 is printed into the car, and holds
the portion of the two-dimensional code image 2 in front of the imaging lens 23a. Then, the user
adjusts the position of the paper surface 5 so that the two-dimensional code image 2 can be
captured well while looking at the imaging monitor display of the display unit 13. The controller
10 waits for a user's imaging operation (so-called shutter operation) when imaging by the
imaging unit 23 and monitor display on the display unit 13 are performed. When the user
adjusts the position of the sheet 5 to make the two-dimensional code image 2 a subject, the user
performs a specific operation such as pressing the operation key 23 b again. The controller 10
recognizes this as an imaging operation, advances the process from step F203 to step F204, and
executes the imaging process. That is, image data at that time (a still image of one frame obtained
by imaging the two-dimensional code image 2) is supplied to the decoding unit 24 as imaged
image data. Then, in step F205, the controller 10 takes in the audio setting data Dq decoded by
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the decoding unit 33. Next, in step F206, the controller 10 applies the equalizing coefficient
setting value and the delay time value included in the audio setting data Dq to the DSP 14 to set
the equalizing coefficient and time alignment delay time for sound field adjustment.
[0047]
By the above process, the setting for sound field adjustment in the audio reproduction device 1 is
completed based on the audio setting data Dq provided for each vehicle type as the twodimensional code image 2. Thereafter, at the time of audio reproduction with the disc
reproduction unit 15, the tuner unit 16 or the external input unit 17 as a source, the DSP 14
performs equalization processing and time alignment adjustment processing by setting with the
audio setting data Dq. Since the reproduction output is performed, the reproduction sound is
provided to the listener in the vehicle compartment in a state suitable for the compartment space
and the speaker arrangement position in the vehicle compartment.
[0048]
[3. Effects and Modifications of the Embodiment] According to the embodiment as described
above, the audio setting of the on-vehicle audio reproduction device 1 according to the vehicle
type, that is, the sound according to the vehicle interior space by the user's simple operation. It is
possible to execute setting of equalizing filter coefficients as field adjustment and delay time
values for time alignment adjustment. The user obtains, for example, the two-dimensional code
image 2 prepared corresponding to his own car, captures an image with the code reading device
3, and then communicatively connects the code reading device 3 and the audio reproducing
device 1 The setting data Dq may be transferred to the audio reproduction device 1 (first
embodiment). Alternatively, when obtaining the two-dimensional code image 2 prepared for the
own vehicle, the two-dimensional code image 2 may be brought into the car and imaged by the
audio reproduction device 1 (second embodiment). In other words, for the user, only after
obtaining the two-dimensional code image 2 suitable for the vehicle type of the user, it is only
necessary to take an image and perform an operation for transferring the recorded audio setting
data Dq to the audio reproduction device 1 (Or only by causing the audio reproduction device 1
to perform imaging), it is possible to realize the adjustment for realizing the optimum acoustic
space very easily. Moreover, the adjustment result is the most suitable adjustment state
according to the vehicle interior space of the car and the speaker arrangement, and high-quality
audio reproduction can be enjoyed easily.
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[0049]
In addition, two-dimensional code image 2 can be distributed in various states such as car
brochures, advertisements, magazines, Internet homepages, instruction manuals for in-vehicle
audio playback devices, etc. It is easy to find the code image 2 and, for the service provider (for
example, the maker or the seller of the audio reproducing apparatus 1), it is possible to distribute
information as compared to distributing adjustment data using, for example, a disk or a memory
card. Cost can also be lowered. Of course, as in the conventional method, a very large volume of
data for all vehicle types is distributed to users on disks etc., and the user side makes a small
portion of the data for their own car models. There is no waste of using only data. Of course,
there is no configurational waste in which audio setting data Dq of all types of vehicles are stored
in advance inside the audio reproduction device 1. Of course, it is not necessary to provide a
microphone for sound field measurement and advanced arithmetic processing performance for
calculating an audio setting value from the measurement result.
[0050]
Furthermore, being able to distribute the audio setting data Dq for each vehicle type by the twodimensional code image 2 makes it possible to easily distribute the new audio setting data Dq
according to the new car even if there is a sale of a new car from the car manufacturer . For
example, the two-dimensional code image 2 corresponding to the new car may be posted on the
Internet homepage, or the two-dimensional code image 2 may be printed in the catalog of the
new car, etc. in accordance with the new car sales.
[0051]
The present invention is not limited to the example of the embodiment, and various modifications
can be considered. The configuration of the audio reproduction device 1 is not limited to the
examples shown in FIGS. 5 and 8 and can be variously considered. A configuration provided with
both the communication interface unit 22 of FIG. 5 and the imaging unit 23 and the decoding
unit 24 of FIG. 8 is also assumed. Further, in the process of FIG. 7, the audio setting data Dq is
transferred from the code reading device 3 to the audio reproducing device 1 according to the
user's operation, but the cable 4 is connected as shown in FIG. Alternatively, the audio setting
data Dq may be automatically transferred when the wireless communication of FIG. 3C is
established. Further, in the communication of FIG. 3 (b) or FIG. 3 (c), the audio setting data Dq
may be transferred by the operation of the code reader 3.
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[0052]
In the audio setting data Dq recorded as the two-dimensional code image 2, the equalizing
coefficient setting value for sound field adjustment and the time alignment delay time value are
recorded, but other adjustment values of acoustic processing are recorded. Other sound
processing settings may be performed in the DSP 14. In addition to the audio setting data Dq,
other information may be included. For example, as text data, a message to a user or a vehicle
type name may be considered. When the audio setting data Dq and the vehicle type name are
recorded in the two-dimensional code image 2, the audio reproducing device 1 displays the
vehicle type name information on the display unit 13 when the information is taken in, thereby
the user It is possible to prompt confirmation as to whether or not the two-dimensional code
image 2 of a different vehicle type is erroneously captured. In addition, it is possible to display a
message to guide the operation to the user or even to promote an advertisement. It is also
conceivable to store a system upgrade program in the information image and execute the
program upgrade of the controller 10.
[0053]
Further, although the two-dimensional code image 2 such as a QR code is given as an example of
the information image, for example, a one-dimensional image code generally called a barcode
may be used. Furthermore, it is also conceivable to use a sheet-like hologram memory.
[0054]
It is an explanatory view of a system configuration of a 1st embodiment of the present invention.
It is explanatory drawing of the two-dimensional code image of embodiment. It is explanatory
drawing of the utilization form of 1st Embodiment. It is a block diagram of the code reader of a
1st embodiment. FIG. 1 is a block diagram of an audio reproduction device according to a first
embodiment. It is a block diagram of the sound field adjustment system of the audio
reproduction apparatus of embodiment. It is a flowchart of the audio setting process of 1st
Embodiment. It is a block diagram of the audio reproduction apparatus of the 2nd Embodiment
of this invention. It is explanatory drawing of the utilization form of 2nd Embodiment. It is a
flowchart of the audio setting process of 2nd Embodiment.
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Explanation of sign
[0055]
DESCRIPTION OF SYMBOLS 1 audio reproduction apparatus, 2 two-dimensional code image, 3
code reader, 4 cables, 5 sheets, 10 controller 10, 11 memory part, 12 operation part, 13 display
part, 14 DSP, 22 data communication interface part, 23 imaging part , 24 decoding unit
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