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JP2009171364

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DESCRIPTION JP2009171364
An object of the present invention is to provide a "filter characteristic setting device" capable of
realizing the output of sound according to the user's preference and capable of suppressing the
occurrence of distortion or the like of sound. SOLUTION: A CPU 30 outputs a test signal (TSP)
from a plurality of speakers (and subwoofers) to acquire its frequency characteristic data, and
whether or not the subwoofer is connected to the audio system 100 based on the frequency
characteristic data. To judge. Further, as a result of the determination, when the subwoofer is not
connected, the target characteristic is set to the target curve 1, and when the subwoofer is
connected, the target characteristic is set to the target curve 2. Further, the CPU 30 sets the filter
characteristic so that the total frequency characteristic of the audio signal output from the
speaker or the subwoofer passes through the digital filters 22A to 22A and 22B and matches the
set target curve. [Selected figure] Figure 1
Filter characteristic setting apparatus and method, audio system, and program
[0001]
The present invention relates to a filter characteristic setting apparatus and method, an audio
system, and a program, and more particularly, to a filter characteristic setting apparatus and
method for setting a filter characteristic of correction filter means for correcting a characteristic
of an audio signal output from a speaker The present invention relates to an audio system
including filter means for correction whose filter characteristics are set by the characteristic
setting device, and a program for setting the filter characteristics.
[0002]
08-05-2019
1
In audio systems such as in-vehicle audio devices, it is common to reproduce and listen to radio
audio and audio stored in a storage medium such as a CD (Compact Disc) using a speaker
installed in the vehicle. is there.
In addition, the user enjoys, for example, music in which a deep bass is emphasized, by separately
connecting a speaker (for example, a subwoofer) dividing a sound range to be reproduced to an
audio system according to preference.
[0003]
Recently, at the time of installation of an audio system in a vehicle, etc., an audio system that
automatically sets an output characteristic by outputting a test signal from a speaker and
collecting the test signal has also appeared (for example, patent) Reference 1). In addition, when
there is no subwoofer or when the volume of the subwoofer is set to "off", techniques for
switching the acoustic characteristics of other speakers and the connection of the equalizer
setting means are also emerging (see, for example, Patent Documents 2 and 3) ).
[0004]
JP-A-2006-157597 JP-A-2004-40625 JP-A-2006-157597
[0005]
However, in the case of the audio system in which the output characteristics are automatically
set as in Patent Document 1, the ideal acoustic characteristics (target characteristics) are
basically set regardless of what kind of speakers are connected to the audio system. It is
unchanged.
For this reason, even if the target characteristic is an auditory ideal characteristic, the user may
be dissatisfied with the fact that the bass region is not emphasized although the subwoofer is
connected to the audio system.
[0006]
08-05-2019
2
In addition, as described in Patent Documents 2 and 3, when there is no subwoofer or when the
volume of the subwoofer is set to "off", an attempt is made to output a bass region that the
subwoofer should normally output to speakers other than the subwoofer Then, there is a concern
that the bass outputted from the speaker may be distorted.
[0007]
Therefore, the present invention has been made in view of the above problems, and a filter
characteristic setting device and method capable of correcting an audio signal to an audio signal
suitable for the user's preference, and outputting an appropriate audio signal It is an object of the
present invention to provide an audio system and program that can
[0008]
The filter characteristic setting device of the audio system according to the present invention
outputs a test signal from the speakers of the plurality of audio signal output channels, and
detects the frequency characteristic of the signal level outputted by each of the speakers. As a
target characteristic of the frequency characteristic of the signal level output from all the
speakers, the first target characteristic and the first target characteristic are used as a judgment
means for judging whether or not a plurality of speakers contain a subwoofer. Target
characteristic holding means for holding two types of the second target characteristic in which
the low frequency band is emphasized, and the first judgment means when it is judged that the
subwoofer is not included in the plurality of speakers. Selecting the second target characteristic
when it is determined that the plurality of speakers include a subwoofer The total frequency
characteristic of the audio signal output from all the speakers is selected by the selection means
after passing through the selection means and the correction filter means for correcting the
characteristics of the audio signal output from each of the speakers And setting means for setting
the filter characteristic of each of the correction filter means based on the frequency
characteristic detected by the frequency characteristic detection means so as to achieve the
target characteristic.
[0009]
According to this, the selection means selects the target characteristic from either the first target
characteristic or the second target characteristic according to whether or not the plurality of
speakers include the subwoofer, and the setting means The filter characteristics of each of the
correction filter means are set so that the frequency characteristics of the total audio signal
output from all the speakers passing through the correction filter means become the target
characteristics selected by the selection means. When the subwoofer is included in the plurality
08-05-2019
3
of speakers, the user can listen to the sound in which the low frequency band is emphasized as
compared to the case where the subwoofer is not included.
Further, when the subwoofer is not included, the output of the low frequency band is more
limited than in the case where the subwoofer is included, so it is possible to suppress the
distortion of sound.
[0010]
In this case, the determination unit may determine whether the plurality of speakers include a
subwoofer based on frequency characteristics of signal levels output from the speakers detected
by the frequency characteristic detection unit. it can.
In such a case, since the presence or absence of the subwoofer is determined based on the
frequency characteristics of the signal level output from each speaker detected by the frequency
characteristic detection means, it is possible to easily determine the presence or absence of the
subwoofer.
In this case, the frequency characteristic detection means may include a microphone for
acquiring a test signal output from each of the speakers.
[0011]
The filter characteristic setting device according to the present invention further comprises
switch means for turning on / off the use of the subwoofer, and when the switch means is turned
off, the selection means does not depend on the judgment of the judgment means. The first target
characteristic may be selected as the target characteristic. In such a case, when the use of the
subwoofer is turned off, appropriate filter setting and audio signal correction are performed by
setting the same filter characteristics as in the case where the subwoofer is not included in the
plurality of speakers. It becomes possible.
[0012]
An audio system according to the present invention comprises: filter means for correction whose
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4
filter characteristics are set by the filter characteristic setting device according to the present
invention, an audio sound source for inputting an audio signal to the filter means for correction,
and the filter means for correction And a speaker for outputting the passed audio signal.
[0013]
According to this, since an appropriate filter characteristic is set according to the presence or
absence of the subwoofer, the audio signal output from the audio sound source can be
appropriately corrected by the correction filter means and output from the speaker .
[0014]
The filter characteristic setting method according to the present invention comprises: a
frequency characteristic detection step of outputting test signals from speakers of a plurality of
audio signal output channels and detecting frequency characteristics of signal levels outputted by
the respective speakers; A first target characteristic is selected when it is determined in the
determining step that the subwoofer is not included in the plurality of speakers in the
determining step and whether or not the subwoofer is included in the first target characteristic;
Selecting the second target characteristic in which a lower frequency band is emphasized than
the first target characteristic when it is determined that the subwoofer is included therein; the
selected target characteristic and the frequency The characteristic of the audio signal output
from each of the speakers is determined based on the frequency characteristic detected in the
characteristic detection step. A setting step of setting a filter characteristic of the positive
correcting filter means, to include the features.
[0015]
According to this, in the selection step, the target characteristic is selected from either the first
target characteristic or the second target characteristic according to whether or not the plurality
of speakers include the subwoofer, and in the setting step The filter characteristics of each of the
correction filter means are set so that the frequency characteristics of the total audio signal
output from all the speakers passing through the correction filter means become the target
characteristics selected in the selection step. When the subwoofer is included in the plurality of
speakers, the user can listen to the voice in which the low frequency band is emphasized as
compared to the case where the subwoofer is not included.
Further, when the subwoofer is not included, the output of the low frequency band is more
limited than in the case where the subwoofer is included, so that it is possible to suppress the
08-05-2019
5
distortion of the sound.
[0016]
In the filter characteristic setting method according to the present invention, in the determination
step, it is determined whether the subwoofer is included in the speaker based on the frequency
characteristic of the signal level output by each speaker detected in the frequency characteristic
detection step. can do.
In such a case, since the presence or absence of the subwoofer is determined based on the
frequency characteristics of the signal level output from each speaker detected in the frequency
characteristic detection step, the presence or absence of the subwoofer can be easily determined.
In this case, the frequency characteristic detection step can be acquired via a microphone that
acquires a test signal output from each of the speakers.
[0017]
In the filter characteristic setting method according to the present invention, the method further
includes an on / off determination step of determining on / off of the use of the subwoofer, and
in the selection step, the determination step is performed when the use of the subwoofer is off.
The first target characteristic can be selected as the target characteristic regardless of the
judgment in. In such a case, when the use of the subwoofer is turned off, appropriate filter
setting and audio signal correction are performed by setting the same filter characteristics as in
the case where the subwoofer is not included in the plurality of speakers. It becomes possible.
[0018]
According to the program of the present invention, it is determined that the computer determines
that the speakers include a plurality of audio signal output channels include subwoofers, and the
determination unit determines that the plurality of speakers do not include the subwoofers.
When it is determined that a first target characteristic is selected and the plurality of speakers
include a subwoofer, a second target characteristic in which a lower frequency band is
emphasized than the first target characteristic is selected. After passing through the selection
08-05-2019
6
means to be selected and the correction filter means for respectively correcting the
characteristics of the audio signal outputted from each speaker, the total audio signal outputted
from each speaker is selected by the selection means Based on the measured value of the
frequency characteristic of the signal level output from each of the speakers, the target
characteristic is obtained. Setting means for setting the filter characteristic of the correction filter
means and thereby function as a.
[0019]
According to this, the computer selects the target characteristic from either the first target
characteristic or the second target characteristic according to whether or not the plurality of
speakers include the subwoofer, and the correction filter means are selected. Since the filter
characteristics of the correction filter means are set so that the frequency characteristics of the
total audio signal output from all the speakers pass through to be the selected target
characteristics, the subwoofer is included in the plurality of speakers If so, the user can listen to
the voice in which the low frequency band is emphasized more than when the subwoofer is not
included.
Further, when the subwoofer is not included, the output of the low frequency band is more
limited than in the case where the subwoofer is included, so that distortion of voice can be
suppressed.
[0020]
According to the present invention, a filter characteristic setting apparatus and method capable
of correcting an audio signal to an appropriate audio signal according to a user's preference, and
an audio system and program capable of outputting an appropriate audio signal are provided.
can do.
[0021]
Hereinafter, an embodiment of an audio system of the present invention will be described based
on FIGS. 1 to 3.
[0022]
08-05-2019
7
FIG. 1 schematically illustrates the configuration of an audio system 100 according to an
embodiment.
As shown in FIG. 1, an audio system 100 includes a sound source 10, an A / D converter 12, a
digital signal processor (hereinafter simply referred to as "DSP") 14, and five power amplifiers
16A1 to 16A4, 16B. And four speakers 18A1 to 18A4.
Among these, the speakers 18A1 to 18A4 constitute a four-channel speaker system. Further, to
the power amplifier 16B, it is possible to externally connect a subwoofer 18B suitable for the
output of low-range sound as shown in FIG. 1 according to the user's preference. When the
subwoofer 18B is connected as described above, a 4.1 channel speaker system is configured by
the subwoofer 18B and the four-channel speaker system described above. In the present
embodiment, only one power amplifier 16B is provided. However, the present invention is not
limited to this. A configuration in which two or more subwoofers 18B can be connected by
providing two or more power amplifiers 16B As well.
[0023]
The sound source 10 is, for example, a player for reproducing audio information stored in a
storage medium such as a radio sound source or a CD (compact disc), and the A / D converter 12
converts an analog signal into a digital signal. It is.
[0024]
As shown in FIG. 1, the DSP 14 includes digital filters 22A1 to 22A4 and 22B as correction filter
means, D / A converters 24A1 to 24A4 and 24B, switch mechanisms 26A1 to 26A4 and 26B, and
TSP (time stretch And an external memory 32 as target characteristic holding means.
[0025]
Among these, the digital filters 22A1 to 22A4 and 22B change the filter characteristics under the
instruction of the CPU 30, and execute the filtering operation on the signal input from the A / D
converter 12.
The D / A converters 24A1 to 24A4, 24B convert digital signals into analog signals and output
them.
08-05-2019
8
The switch mechanisms 26A1 to 26A4 connect the digital filters 22A1 to 22A4 and the D / A
converters 24A1 to 24A4 under the instruction of the CPU 30, respectively, and the TSP
generator 28 and the D / A converter 24A1. .About.24A4 is a switch for setting whether or not
each is connected. Similarly, under the instruction of the CPU 30, the switch mechanism 26B also
determines whether or not the digital filter 22B and the D / A converter 24B are connected, and
the TSP generator 28 and the D / A converter 24B. It is a switch for setting whether to connect
between.
[0026]
When the TSP generator 28 is connected to any of the D / A converters 24A1 to 24A4 or 24B by
the switch mechanism 26A1 to 26A4 or 26B, the TSP generator 28 generates a time stretch
pulse as a test signal for measuring an acoustic characteristic. is there.
[0027]
The CPU 30 controls the entire DSP 14 in an integrated manner, and changes (sets) the filter
characteristics of the digital filters 22A1 to 22A4 and 22B as described above.
The specific processing by the CPU 30 will be described in detail later.
[0028]
The external memory 32 is a target curve 1 having normal characteristics (see FIG. 2A) as target
frequency characteristic data of the entire speaker and subwoofer required to determine the
filter characteristics of each of the digital filters 22A1 to 22A4 and 22B. And a target curve 2
(see FIG. 2B) in which a lower frequency band is emphasized than the target curve 1 are stored.
[0029]
The power amplifiers 16A1 to 16A4 and 16B amplify analog signals output from the D / A
converters 24A1 to 24A4 and 24B of the DSP 14.
08-05-2019
9
The speakers 18A1 to 18A4 are respectively installed on the front left (FL), the front right (FR),
the rear left (RL), and the rear right (RR) in the vehicle. Further, when the subwoofer 18B is
installed, it is installed, for example, in the rear central portion of the vehicle (between the rear
left (RL) speaker 18A3 and the rear right (RR) speaker 18A4).
[0030]
In the audio system 100 of the present embodiment configured as described above, the
frequency characteristic measurement unit 40 can be externally connected to the A / D converter
12 as indicated by a dotted line in FIG. 1. The frequency characteristic measurement unit 40 has
a microphone 42 and a microphone amplifier 44. The microphone 42 is for collecting test signals
output from the speakers 18A1 to 18A4 and the subwoofer 18B, and the microphone amplifier
44 is for amplifying an analog signal input from the microphone 42. According to the frequency
characteristic measurement unit 40, when the time stretch pulse generated in the TSP generator
28 is output from any of the speakers 18A1 to 18A4 and the subwoofer 18B, the output signal
sound can be collected and amplified. it can. This output signal sound is used when setting the
filter characteristics of each of the digital filters 22A1 to 22A4 and 22B described later.
[0031]
Next, a method of setting the filter characteristics of each of the digital filters 22A1 to 22A4 and
22B will be described along the flowchart of FIG. The process of FIG. 3 is executed by the CPU 30
shown in FIG. Therefore, in the following, the description of the subject of the processing is
omitted unless it is particularly necessary.
[0032]
Also, as a premise of processing, the subwoofer 18B is connected to the power amplifier 16B
(that is, the audio system 100 is equipped with a 4.1 channel speaker system), and in advance to
the A / D converter 12. On the other hand, it is assumed that the frequency characteristic
measurement unit 40 is connected by a user, a car dealer's worker or the like, and the
microphone 42 of the frequency characteristic measurement unit 40 is installed at a
predetermined position in the vehicle.
[0033]
08-05-2019
10
First, in step S10 of FIG. 3, the parameter n representing the channel of the speaker is set to 1,
and the subwoofer flag is set to OFF.
In the present embodiment, it is assumed that the channels of the speakers are 1 to 5; channel 1
= front left (FL) speaker 18A1, channel 2 = front right (FR) speaker 18A2 and channel 3 = rear
left (RL) speaker 18A3 , Channel 4 = rear right (RR) speaker 18A4, channel 5 = subwoofer 18B.
[0034]
In the next step S12, it is determined whether or not the process ends. Here, it is judged based on
whether or not the parameter n is larger than a predetermined number (in the present
embodiment, the number of channels “5”) (whether n> 5). In this case, the determination is
negative because n = 1, and the process proceeds to the next step S14.
[0035]
In the next step S14, the D / A converter 24A1 and the TSP generator 28 are connected using the
switch mechanism of channel n (here, switch mechanism 26A1), and the switches of other
channels (n = 2 to 5) are connected. The mechanisms 26A2 to 26A4, 26B are used to release the
connection between the D / A converters 24A2 to 24A4, 24B and the TSP generator 28.
[0036]
Next, in step S16, the TSP generator 28 generates a time stretch pulse as a test signal for
measuring the acoustic characteristic.
[0037]
Next, in step S18, the test signal sound output from the speaker 18A1 is collected by the
microphone 42, amplified by the microphone amplifier 44, and received by the A / D converter
12 as well as the signal converted into a digital signal by the CPU 30. .
Then, in the CPU 30, the received signal is subjected to FFT (Fast Fourier Transform) processing
or the like to acquire frequency characteristic data of the FL speaker 18A1 in the vehicle
08-05-2019
11
compartment.
In this case, the frequency characteristic of the test signal sound output from the FL speaker
18A1 has such a characteristic as to have a signal level equal to or more than a fixed level over
the entire frequency band.
[0038]
Next, in step S20, it is determined based on the frequency characteristic data acquired in step
S18 whether the speaker of channel 1 is a subwoofer. Here, whether or not it is a subwoofer is
determined based on whether it has a high signal level only in the low frequency band or a signal
level above a certain level over the entire frequency band. Here, since it has a signal level above a
certain level over the entire frequency band, it is determined that it is not a subwoofer (the
determination here is negative), and the process proceeds to step S22.
[0039]
After n is incremented by one (n ← 2) in step S22, the process returns to step S12.
[0040]
After that, by repeating steps S12 → S14 → S16 → S18 → S20 → S22 while n = 2, n = 3, n = 4,
the frequency characteristic data of the FR speaker 18A2, the RL speaker 18A3, and the RR
speaker 18A4 is obtained. It is acquired (step S18), and it is determined whether it is a subwoofer
(step S20).
When n = 2 to 4, all the determinations in step S20 are negative.
[0041]
When n = 4, n is incremented by 1 (n ← 5) in step S22, and the process returns to step S12. In
step S12, it is determined whether n is larger than 5 or not. In this case, the determination here is
negative because n = 5, and the process proceeds to the next step S14. In step S14, the switch
08-05-2019
12
mechanism 26B of channel 5 is used to connect between the TSP generator 28 and the D / A
converter 24B.
[0042]
Thereafter, in step S16, the TSP generator 28 generates a test signal (TSP) for measuring the
acoustic characteristics, and in step S18, the signal converted into the digital signal is received,
whereby the frequency characteristic data of the subwoofer 18B in the vehicle compartment To
get In this case, the frequency characteristic of the test signal sound output from the subwoofer
18B is a characteristic having a high signal level only in the low frequency band.
[0043]
Next, in step S20, it is determined based on the frequency characteristic data acquired in step
S18 whether the speaker of channel 5 is a subwoofer. In this case, since the frequency
characteristic data has a high signal level only in the low frequency band, it is determined to be a
subwoofer (this determination is affirmed), and after the subwoofer flag is set to ON in step S24. ,
Shift to step S22 again.
[0044]
Then, after n is incremented by 1 (n ← 6) in step S22, the process returns to step S12. In step
S12, it is determined whether or not the process is ended depending on whether n> 5. However,
since n = 6 in this case, the determination is affirmed, and the process proceeds to step S26.
[0045]
In the next step S26, it is determined whether the subwoofer flag is ON. In this case, since the
subwoofer flag is ON in step S24 executed when n = 5, the determination here is affirmed, and
the process proceeds to step S30.
[0046]
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13
In this step S30, as a target frequency characteristic (target frequency characteristic) of the audio
system 100, a target curve 2 shown in FIG. 2B in which a low frequency band is emphasized is
read out from the external memory 32 and set.
[0047]
Thereafter, the process proceeds to step S32, and the CPU 30 performs step such that the total
audio signal (sound) output from all of the speakers and subwoofer of the audio system 100
matches the set target characteristic (target curve 2). In S16 and S18, the filter characteristics of
the digital filters 22A1 to 22A4 and 22B are set using the frequency characteristics data of each
speaker and subwoofer measured in the vehicle interior, and the setting process of the filter
characteristics of this embodiment is ended.
[0048]
When subwoofer 18B is not connected to power amplifier 16B, that is, when audio system 100 is
a four-channel speaker system, frequency characteristic data is calculated in step S18 which is
executed when n = 5. Since it can not acquire, judgment of step S20 will be denied.
In this case, since there is no subwoofer in the audio system 100, the subwoofer flag remains
OFF at the time of step S26.
Therefore, since the determination here is denied, in step S28, the target curve 1 shown in FIG.
2A, which is a normal filter characteristic as the target frequency characteristic (target frequency
characteristic) of the audio system 100, is stored in the external memory. Read from 32 and set.
Then, in step S32, the CPU 30 performs steps S16 and S18 so that the total audio signal (sound)
output from the speakers 18A1 to 18A4 of the audio system 100 matches the set target
characteristic (target curve 1). The filter characteristics of each of the digital filters 22A1 to
22A4 and 22B are set using the frequency characteristic data of each of the speakers and the
subwoofer actually measured in the vehicle interior.
[0049]
As is clear from the above description, in the present embodiment, the CPU 30 constitutes the
determination means, the selection means, and the setting means of the present invention.
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14
Further, the frequency characteristic detection means of the present invention is configured by
the TSP generator 28 and the frequency characteristic measurement unit 40 of the present
embodiment. Further, the CPU 30, the TSP generator 28, the external memory 32, and the
frequency characteristic measuring unit 40 of this embodiment constitute a filter characteristic
setting device of the present invention.
[0050]
As described above, according to the present embodiment, the CPU 30 outputs the test signal
(TSP) from a plurality of speakers (and subwoofers), acquires frequency characteristic data of the
signal level, and based on the frequency characteristic data. It is determined whether the
subwoofer is connected to the audio system 100 or not. And as a result of the judgment, when
the subwoofer is not connected, the target frequency characteristic is set to the target curve 1,
and when the subwoofer is connected, the target frequency characteristic is set to the target
curve 2. Set In addition, the CPU 30 measures each speaker measured in the vehicle
compartment so that the total frequency characteristic of the audio signal output from the
speaker or the subwoofer passes the digital filters 22A1 to 22A4 and 22B and matches the set
target curve. The filter characteristics are set using the subwoofer frequency characteristic data.
As described above, in the present embodiment, when the subwoofer 18B is connected to the
audio system 100, it is possible to output a sound in which the low frequency band is
emphasized as compared to the case where the subwoofer is not included. Thereby, the user can
listen to the sound to his liking. In addition, when the subwoofer is not connected to the audio
system 100, the output of the low frequency band is more limited than in the case where the
subwoofer is included, so the low frequency band is forcibly output only by the speakers other
than the subwoofer Since it is suppressed as much as possible, it is possible to suppress the
occurrence of distortion of sound and the like.
[0051]
Further, in the present embodiment, since the presence or absence of the subwoofer is
determined based on the actually detected frequency characteristics, the presence or absence of
the subwoofer may be easily determined without separately preparing a detection system for
detecting the connection state of the speaker. Is possible. However, the present invention is not
limited to this, and the connection state of the speaker may be detected by another detection
system.
08-05-2019
15
[0052]
In the above embodiment, a switch may be provided to turn on / off the use of the subwoofer
18B. In this case, when the user turns off the switch, the CPU 30 can set the target characteristic
to the target curve 1 regardless of the already set target characteristic. In this way, when the
subwoofer 18B is off, it is possible to suppress the sound of the low frequency band to be output
by the subwoofer from being forcibly output to the other speakers. This makes it possible to
suppress the occurrence of distortion or the like of sound.
[0053]
In the above embodiment, the case where one of the two target curves shown in FIGS. 2A and 2B
is set as the target characteristic has been described. However, the present invention is not
limited to this. For example, FIG. The target curve shown in Fig. 4) is the target curve 1 (normal
characteristics), and the target curve shown in Fig. 4B in which the lower frequency band is
emphasized than in Fig. 4A is the target curve 2 (low range emphasis) ) May be used.
[0054]
In the above embodiment, the correction filter unit is applied to a digital filter, but the present
invention is not limited to this. For example, an analog filter, an IIR filter (infinite impulse
response filter), an FIR filter (finite It is also possible to apply to impulse response filters.
[0055]
In the above embodiment, the case where the determination means, selection means and setting
means of the present invention are realized by the program of the CPU 30 has been described,
but the present invention is not limited to this. It may be realized by hardware.
[0056]
Although the above embodiment has described the case where the audio system of the present
invention is mounted on a vehicle, the present invention is not limited to this, and the audio
system of the present invention may be adopted as an audio system disposed in various spaces. It
is possible.
[0057]
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16
The embodiments described above are examples of preferred implementations of the invention.
However, the present invention is not limited to this, and various modifications can be made
without departing from the scope of the present invention.
[0058]
FIG. 1 schematically shows a configuration of an audio system according to an embodiment.
It is a figure showing an example of target curves 1 and 2.
It is a flowchart for demonstrating a series of flows of the setting process of the filter
characteristic which concerns on one Embodiment.
It is a figure showing another example of target curves 1 and 2.
Explanation of sign
[0059]
18A1 to 18A4 speaker 18B subwoofer 22A1 to 22A4 digital filter (filter means for correction)
22B digital filter (filter means for correction) 28 TSP generator (part of frequency characteristic
detection means) 30 CPU (determination means, selection means, setting means 32 External
memory (target characteristic holding means) 40 Frequency characteristic measurement unit
(part of frequency characteristic detection means) 42 Microphone (microphone) 100 Audio
system
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