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JP2005134749

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DESCRIPTION JP2005134749
PROBLEM TO BE SOLVED: To provide an automobile sound processing device which can be
generated in a vehicle interior by performing processing such as imparting an effect to an
automobile sound generated by a power unit of the automobile. SOLUTION: The signal
processing unit is set so as to change the frequency characteristic of an input engine sound in
conjunction with the envelope level of the engine sound. Both the volume and the sound quality
of the engine sound change when the engine brake is applied. The way of this change differs
depending on the sport type and racer type, but is a part that simulates these states. As a filter,
an HSHV (high shelving filter) is configured, and the cutoff frequency or gain of this filter is
changed according to the envelope level (volume) of the engine sound and the value set by the
encoder. [Selected figure] Figure 3
Automobile sound processing device
[0001]
The present invention relates to a car sound processing apparatus, and more particularly to a car
sound processing apparatus that processes car sound generated by an engine or transmission of
a car and generates the car sound in a passenger compartment.
[0002]
As a conventional engine sound generator of an automobile, a device that stores engine sounds
(including exhaust noise) of various automobiles in storage means and reproduces them
according to the traveling state of the automobile (Patent Document 1), or the user selects
10-05-2019
1
Devices that generate exhaust noise according to the type of vehicle and type of muffler are
known.
Further, as disclosed in Japanese Patent Application Laid-Open No. 11-219192 (Patent
Document 2), there is known one in which a pseudo engine sound generated by converting
alternator noise extracted from a battery is generated in a vehicle interior. . JP, 2000-10576, A
JP, 11-219192, A
[0003]
However, when the engine noise (including exhaust noise) stored in the storage means described
in Patent Document 1 is reproduced according to the traveling condition of the vehicle, the
engine noise changes as compared to the actual traveling of the vehicle. A delay occurs, and a
sound different from the driving condition of the car is generated, which makes the user feel
uncomfortable.
[0004]
Further, the engine sound of the car described in Patent Document 2 is a pseudo engine sound
generated by converting alternator noise, and the change in the sound is also different from the
change in the traveling state of the car. I felt uncomfortable.
[0005]
The present invention has been made to solve the above-mentioned problems, and it is possible
to carry out processing such as imparting an effect to an automobile sound generated by a power
unit of the automobile to generate the automobile sound processing in a vehicle interior. It is
intended to provide a device.
[0006]
In order to achieve this object, according to the first aspect of the present invention, there is
provided an automobile sound processing apparatus comprising: detection means for detecting
an automobile sound generated by a power unit of the automobile; and input means for inputting
an automobile sound detected by the detection means And an effect imparting means for
imparting an effect to an automobile sound input to the input means in accordance with the
operating state of the power unit of the automobile.
[0007]
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2
According to the vehicle sound processing apparatus of the first aspect, the sound generated by
the power unit of the vehicle obtained from the engine, the muffler, the transmission, etc. is
effective according to the state of the power unit such as the engine speed and load. Granted.
[0008]
The automobile sound processing apparatus according to claim 2 is the automobile sound
processing apparatus according to claim 1, wherein the effect imparting means changes the
frequency characteristic of the automobile sound inputted to the input means.
[0009]
The automobile sound processing apparatus according to claim 3 is the automobile sound
processing apparatus according to claim 1 or 2, wherein the effect imparting unit is configured
to execute the automobile sound according to an envelope level of the automobile sound input to
the input unit. Changes the characteristics of the filter that passes through.
[0010]
The automobile sound processing apparatus according to claim 4 is the automobile sound
processing apparatus according to any one of claims 1 to 3, wherein the effect imparting means
is inputted to the input means in accordance with the number of revolutions of the engine of the
automobile. To change the characteristics of the filter that passes the vehicle sound.
[0011]
A car sound processing apparatus according to claim 5 is the car sound processing apparatus
according to any one of claims 1 to 4, wherein the effect imparting means is inputted to the input
means in accordance with a load of an engine of the car. To change the characteristics of the
filter that passes the vehicle sound.
[0012]
A car sound processing apparatus according to claim 6 is the car sound processing apparatus
according to any one of claims 1 to 5, comprising car type selection means for selecting a car
type, and the effect imparting means is the car type selection means. According to the type of
vehicle selected by the above, the aspect of the effect given to the sound of the vehicle is changed
according to the operating state of the power unit of the vehicle.
[0013]
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3
A car sound processing apparatus according to claim 7 is the car sound processing apparatus
according to any one of claims 1 to 6, comprising an operating element for setting a control
value, wherein the effect applying means is operated by the operating element. According to the
set control value, the mode of the effect given to the vehicle sound is changed according to the
operation state of the power unit of the vehicle.
[0014]
According to the vehicle sound processing apparatus of the present invention, the detection
means for detecting the vehicle sound generated by the power unit of the vehicle, the input
means for inputting the detected vehicle sound, and the operating state of the power unit of the
vehicle Since the effect providing means for applying an effect to the sound inputted to the input
means is provided, it is possible to give an automobile sound such as an engine sound etc. an
effect of a sound conforming to the operating state of the engine.
For this reason, it is possible to enjoy the sound different from the original sound generated by
the car and enjoy it, as compared with the method of reading out the waveform stored in the
storage means, a more realistic feeling that matches the operating state of the actual power unit
of the car Has the effect of being able to make a car sound high.
[0015]
A preferred embodiment of the effect imparting means is to change the frequency characteristics
of the car sound, which allows the car sound to be processed and generated as a distinctive car
sound according to different car types and preferences. effective.
[0016]
Also, the operating state of the power unit includes the envelope level of the engine sound, the
engine load, and the engine speed, and by changing the characteristics of the filter according to
the change of these states, it is further characterized as an automobile sound or There is an effect
that it can change to the emphasized vehicle sound.
[0017]
In addition, since a means for arbitrarily setting the method of changing the frequency
characteristic that changes according to the power unit such as the engine or the traveling state
is provided, the vehicle sound can be changed to the user's preference. .
10-05-2019
4
[0018]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the accompanying drawings.
FIG. 1 is a block diagram showing an electrical configuration of a car sound processor according
to the present invention.
In the figure, the user operates the interface 16 of an in-vehicle LAN (Local Area Network) that
connects the CPU 10, the ROM 12, the RAM 14, and other CPUs installed in various parts of the
vehicle and holding various types of information; A bus 34 is connected to an operation panel 18
provided with an operator and the like, a sound source 20 for generating a predetermined sound,
and a DSP 22 for performing processing such as imparting an effect to car sound.
[0019]
The CPU 10 is a central processing unit, and the ROM 12 stores various control programs
executed by the CPU 10 and fixed value data to be referred to when the program is executed.
A program executed by the DSP 22 described later and various tables such as a table referred to
when the DSP 22 applies an effect are stored in the ROM 12.
[0020]
The RAM 14 has a working area in which various register groups and the like necessary for the
CPU 10 to execute the control program are set, a temporary area for temporarily storing data
being processed, and the like, and can be accessed randomly. It is.
[0021]
The interface 16 is an interface of the in-vehicle LAN, and through this interface, the speed of the
car displayed by the speedometer, the number of revolutions of the engine displayed by the
tachometer, the gear ratio of the currently set transmission, etc. You can get information on
10-05-2019
5
[0022]
The operation panel 18 is a group of controls for setting various parameters as shown in FIG. 2,
and has controls for adjusting volume and sound quality, and an effect selection switch.
[0023]
The sound source 20 reads a waveform stored in a waveform memory provided inside the sound
source 20 and outputs the waveform to the DSP 22. In this device, the sound source 20 stores an
effect while applying an effect to a car sound. Can be added to increase the variation of the car
sound.
[0024]
The DSP 22 converts an electric signal obtained from the sensor 26 attached to each part of the
engine, a muffler, a transmission, etc. into a digital signal by the A / D converter 24 and performs
processing such as applying an effect to the digital signal It is a signal processing circuit.
The digital signal processed by the DSP 22 is converted to an analog signal by the D / A
converter 28, amplified by the amplifier 30, and emitted from the speaker 32.
The speakers 32 are disposed at a plurality of positions in front of and behind the seat in the car.
[0025]
FIG. 2 is a view showing details of the operation panel 18, and the touch display 40 is provided
with a pressure sensor on the LCD display screen, and the selection etc. are made according to
the position pressed by the user and the content displayed at that position. An operation can be
performed, and a screen for selecting a type of preset effect is displayed on the screen of this
figure.
[0026]
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6
Here, presets of four types of effects, normal 40a, S (sports type) 40b, R1 (race type 1) 40c, R2
(race type 2) 40d, are displayed, and one of the display areas is displayed with a finger or the
like. When pressed, the preset displayed in that area is selected.
In this figure, S (sports type) 40b is highlighted and shows an example currently selected.
The normal 40a is a preset with no effect, and when this preset is selected, the car sound
detected by the sensor 26 is amplified as it is by the amplifier 30 and emitted from the speaker
30.
[0027]
The area 40e in which the up and down arrows are displayed is an operation area for scrolling
the display content, and is used to select an effect other than the currently displayed type of
effect, set another parameter, or the like. It is possible to scroll upward or downward by pressing
upward.
Alternatively, the cursor can be scrolled by moving upward or downward while pressing the
cursor 40f in this area.
[0028]
The encoders Lacey 42, Bottom 44, and Volume 46 are rotary knobs for setting the respective
parameters, and the volume 46 is for adjusting the volume output from the speaker 32, and the
details of the Lacey 42 and Bottom 44 are given below. I will mention later.
[0029]
FIG. 3 is a block diagram for simply explaining the process performed by the DSP 22. As shown
in FIG.
Automobile sounds include various sounds such as sounds generated by an engine, a muffler, and
a transmission as the vehicle travels.
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7
These sounds change in various ways according to the driving condition, and the level and
frequency characteristics of the car sound change very complicatedly.
In order to change the frequency characteristics of these sounds according to the type of car, etc.,
many filters such as low pass filter, band pass filter, high pass filter, comb filter etc. are required,
and the characteristics of each filter It is necessary to change according to the condition and the
running condition.
[0030]
In the present embodiment, in order to facilitate understanding, as an automobile sound, an
engine sound generated by the engine itself will be described as an example.
In addition, an example will be described in which two of the filters that have the most
characteristic change their characteristics by one parameter respectively.
In the following description, as the parameters, the engine sound envelope level and the engine
speed are exemplified, but any parameter may be replaced with the engine load.
The load on the engine can be obtained from the speed and acceleration of the vehicle and the
gear ratio of the transmission.
[0031]
FIG. 3A is a diagram showing a signal processing unit set so that the frequency characteristic of
the input engine sound changes in synchronization with the envelope level of the engine sound,
and the accelerator of the automobile is depressed to accelerate When or when the engine brake
is applied on the downhill, both the volume and the sound quality of the engine sound change.
The manner of this change differs depending on the sport type and the race type, and simulating
10-05-2019
8
these states by this signal processing unit converts the car sound of a normal car as if it is a car
sound of a sport or race type. Can.
[0032]
A high shelving filter (HSHV) 50 is configured as a filter, and the cutoff frequency and gain of
this filter are changed according to the envelope level (volume) of the engine sound and the
control value set by the encoder.
[0033]
FIG. 3B is a diagram showing a signal processing unit set so that the frequency characteristic of
the input engine sound changes in conjunction with the engine rotation speed, and the engine
sound of the automobile is the engine rotation speed Depending on the volume and sound quality
changes.
The manner of this change differs depending on the sport type and the race type, and simulating
these states by this signal processing unit converts the car sound of a normal car as if it is a car
sound of a sport or race type. Can.
A BPF (band pass filter) 52 is configured as a filter, and the center frequency, gain, and Q of the
band pass filter are changed according to the number of revolutions of the engine and the
control value set by the encoder.
[0034]
The number of revolutions of the engine may be obtained from the information displayed by the
tachometer, or the pitch or frequency characteristics may be obtained from the ignition cycle of
the spark plug or the engine sound and may be obtained from the information.
The HSHV 50 shown in FIG. 3 (a) and the band pass filter 52 shown in FIG. 3 (b) are arranged in
series, but may be in any order.
10-05-2019
9
[0035]
FIG. 4 shows how the frequency characteristics of the engine sound are changed by changing the
filter characteristics according to the envelope level of the engine sound. Here, a sensor is
attached to the so-called engine of a normal car, and A case where the rotation speed is 2000
rpm, which is the case where conversion to the type) is performed (when S (sports type) is
selected among the presets) and the rotation speed is 2000 rpm will be described.
[0036]
In FIG. 4, (a) shows the frequency characteristic of the engine sound when the envelope level of
the engine of a normal car is small.
This car sound has a peak in the low band and is a characteristic that attenuates gently to the
high band.
(B) shows the frequency characteristics when the rotation speed is 2000 rpm and the envelope
level is large in this normal car, and the level rises over the entire area compared to the case
where the envelope level is small, especially in the low frequency range. Levels increase.
[0037]
The selected preset S (sport type) has filter characteristics as shown in (c) when the envelope
level is small, that is, characteristics to lower the high frequency level, and when the engine
sound envelope level is large, As shown in (d), it is a filter characteristic that slightly raises the
high region.
[0038]
(E) is the frequency characteristic of the engine sound obtained when the engine sound shown in
(a) is processed by the filter shown in (c), and the high frequency band of the original automobile
sound is suppressed.
(F) is an engine sound obtained when the engine sound shown in (b) is processed by the filter of
the characteristic shown in (d), and the high region is raised.
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10
By changing the characteristics of the filter according to the envelope level of the engine in this
way, it is possible to simulate the behavior of a sports type engine sound.
[0039]
FIG. 5 shows the cut-off frequency and gain of the HSHV 50 set according to the type of preset,
and similarly, when the number of revolutions of the engine is 2000 rpm, the preset is S (sports
type) and the engine sound The filter characteristic when the envelope level of is small is shown
in (a), and the filter characteristic when the envelope level of the engine sound is large is shown
in (b) (the same as (c) and (d) in FIG. 4).
[0040]
The filter characteristic when the preset is R1 (race type 1) and the engine sound envelope level
is small is shown in (c), and the filter characteristic when the engine sound envelope level is large
is shown in (d).
The cut-off frequency of the HSHV 50 is set to a low value regardless of whether the envelope
level of the engine sound is smaller or larger than that of the S (sports type). The filter
characteristic when the preset is R2 (race type 2) and the envelope level of the engine sound is
small is shown in (e), and the filter characteristic when the envelope level of the engine sound is
large is shown in (f). When the envelope level of the engine sound is small, the cutoff frequency
of the HSHV 50 is set lower than R1 (race type 1), and when the envelope level of the engine
sound is large, the cutoff frequency of the HSHV 50 is set higher.
[0041]
FIG. 6 is a diagram showing how the parameters of HSHV change according to the envelope level
of the engine sound. FIG. 6 (a) shows, for each preset, a change curve in which the cutoff
frequency of the HSHV 50 changes according to the envelope level of the engine sound. The
horizontal axis represents the envelope level and the vertical axis represents the cutoff
frequency. It is the graph which represented S by a solid line, preset R1 with a broken line, and
preset R2 with a dashed-dotted line, respectively. In either case, the cutoff frequency is set higher
as the envelope level becomes larger, but the inclination and the size differ depending on the
10-05-2019
11
preset.
[0042]
FIG. 6 (b) shows a change curve in which the gain of the HSHV 50 changes according to the
envelope level of the engine sound, for each setting of the race 42 which is one of the knobs of
the encoder shown in FIG. It is a graph which makes an envelope level and makes a vertical axis |
shaft the gain of HSHV50. As the envelope level increases, the gain changes from the negative
predetermined value to the positive direction, but the larger the control value set by the race 42,
the larger the inclination. The envelope level can be obtained by a method such as rectifying the
input engine sound and integrating the rectified peak value.
[0043]
Next, processing for changing the frequency characteristics of the vehicle sound in conjunction
with the number of revolutions of the engine will be described.
[0044]
FIG. 7 shows how to change the frequency characteristics of the engine sound by changing the
filter characteristics according to the number of revolutions of the engine. Here, a sensor is
attached to the engine of a normal car, and S (sports type) The case where is selected as a preset
will be described.
[0045]
FIG. 7A shows the frequency characteristic of the engine sound when the rotation speed of the
engine of a normal car is 1200 rpm, having a peak near 40 Hz and gently decaying toward the
high frequency.
FIG. 7 (b) shows the frequency characteristic of the engine sound when the number of
revolutions of the engine of the normal vehicle is 6000 rpm as well, having a peak near 200 Hz
and gently reducing to the high region.
The rotation speed of 1,200 rpm corresponds to 20 Hz in frequency, and in a four-cycle engine,
10-05-2019
12
explosion is performed once in two revolutions, so the explosion cycle for one cylinder is 10 Hz.
In the case of four cylinders, although the interval of explosion of four cylinders differs
depending on the type of vehicle, it is assumed here that explosion occurs at substantially equal
intervals, and the peak of its frequency characteristic is about 40 Hz. Similarly, the peak of the
frequency characteristic at a rotational speed of 6000 rpm is 200 Hz.
[0046]
In the selected preset S (sport type), when the engine speed is low, the center frequency of the
band pass filter is approximately 40 Hz, which is the peak frequency characteristic of the engine
sound, as shown in (c). When the engine speed is high, as shown in (d), the center frequency of
the band pass filter is set to about 200 Hz, which is the frequency at which the frequency
characteristic of the engine sound peaks, and the gain of the band pass filter 52 is The filter
characteristics are to be raised.
[0047]
(E) shows the frequency characteristics of the engine sound obtained by processing the engine
sound shown in (a) with the band pass filter of the characteristic shown in (c) when the engine
speed is low. The frequency corresponding to the number of rotations is slightly raised.
[0048]
(F) shows the frequency characteristic of the engine sound obtained by processing the engine
sound shown in (b) with the band pass filter of the characteristic shown in (d) when the engine
speed is high. The level of the frequency corresponding to the rotational speed can be raised
more.
[0049]
FIG. 8 shows the center frequency and gain of the band pass filter 52 set according to the type of
preset. The filter characteristic when the preset is S (sports type) and the engine speed is 1200
rpm (a B) shows the filter characteristics when the engine speed is 6000 rpm.
(Same as (c) and (d) in Fig. 7) The filter characteristics when the preset is R1 (race type 1) and
the engine speed is 1200 rpm is (c). The engine speed is 6000 rpm. The filter characteristics are
shown in (d) respectively.
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13
Although the center frequency of the band pass filter 52 is the same whether the engine
rotational speed is low or high as compared with S (sports type), the bandwidth is set to be
narrow.
[0050]
The filter characteristics when the preset is R2 (race type 2) and the engine speed is 1200 rpm
are shown in (e), and the filter characteristics when the engine speed is 6000 rpm are shown in
(f).
When the engine speed is low, the center frequency of the band pass filter 52 is the same as that
of R1 (race type 1), but the bandwidth is set wider.
[0051]
FIG. 9 is a diagram showing how the parameter of the band pass filter changes in accordance
with the number of revolutions of the engine. FIG. 9 (a) shows a change curve in which the center
frequency of the band pass filter 52 is changed according to the number of revolutions of the
engine for each control value set by the bottom 44 as an encoder. It is a graph when the setting
of the bottom 44 is small, medium and large, with the number and the vertical axis as the center
frequency of the band pass filter 52. In either case, the center frequency of the band pass filter
52 is set higher as the engine speed is higher, but the larger the setting of the bottom 44 is, the
larger the inclination of the upper right is.
[0052]
The frequency (Hz) at which the frequency characteristics of the engine sound become a peak
can be obtained by calculation using Equation 1 from the number of revolutions (rpm) of the
four-cycle engine and the number of cylinders. The center frequency of the band pass filter 52
may be set by multiplying by a coefficient according to the control value set by the bottom 44.
[0053]
In Equation 1, dividing by 60 is the value for revolutions per minute, while the unit of frequency,
Hertz (Hz) is the value per second, and dividing by 2 is 4 In the case of a cycle engine, the
10-05-2019
14
explosion is performed at a rate of once per two revolutions of the engine.
[0054]
FIG. 9 (b) similarly shows a change curve in which the gain of the band pass filter 52 is changed
according to the number of revolutions of the engine for each setting of the bottom 44 which is
an encoder. An axis is a gain of band pass filter 52, and it is a graph when the control value set
by bottom 44 is small, medium, and large.
In any case, the gain changes from the predetermined value to the positive direction as the
number of revolutions of the engine increases. However, the larger the value of the control value
set by the bottom 44, the larger the inclination of the upward slope. There is.
[0055]
FIG. 9 (c) similarly shows a change curve in which the Q of the band pass filter 52 is changed
according to the number of revolutions of the engine, for each preset setting. It is a graph which
is set as Q of pass filter 52, a solid line in the case of preset S, a broken line in the case of preset
R1, and a dashed-dotted line in the case of preset R2.
In all cases, Q is set to decrease as the engine speed increases.
[0056]
As described above, with regard to the engine sound, it has been described that the frequency
characteristic is changed according to the change of the envelope level and the rotational speed,
and the change of this change also by the setting of the preset or the encoder.
[0057]
Next, processing performed by the CPU 10 and the DSP 22 will be described.
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FIG. 10 is a flowchart showing processing executed by the CPU 10 in accordance with the
program stored in the ROM 12.
[0058]
When the power of the present apparatus is turned on, first, an effect processing program
executed by the DSP 22 stored in the ROM 12 and parameters and tables of the selected preset
are sent to the DSP 22 (S1). Next, the values set by the encoders 42, 44, 46 are read and sent to
the DSP 22, and the DSP 22 instructs to start the effect processing (S2).
[0059]
The DSP 22 stores various data sent from the CPU 10 in a predetermined area of the RAM 22 a
in the DSP 22 and starts effect processing according to the received program.
[0060]
Next, the CPU 10 determines whether any one of the presets is selected by the touch display 40
of the operation panel 18 (S3), and when it is determined that it is selected (S3: Yes), the selected
preset is selected. The processing program and parameters corresponding to the request are read
from the table ROM 12 and sent to the DSP 22 (S4), and the processing proceeds to S5.
On the other hand, when it is determined in the process of S3 that the selection of the preset is
not performed (S3: No), the process proceeds to the process of S5.
[0061]
In the process of S5, it is determined whether or not any one of the encoders 42, 44, 46 has been
operated, and if it is determined that it has been operated (S5: Yes), the value of the parameter
corresponding to that encoder is determined, The process is sent to the DSP 22 (S6) and the
process proceeds to S7. On the other hand, if it is determined in the process of S5 that none of
the encoders has been operated (S5: No), the process proceeds to S7.
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16
[0062]
In the process of S7, the DSP 22 determines whether or not the data necessary for the effect
process has been received through the interface 16, and when it is determined that the data
necessary for the effect process has been received (S7: Yes) , The value of the parameter used by
the DSP 22 is obtained, and the value is sent to the DSP 22 (S8) and the process returns to S3. On
the other hand, if it is determined in the process of S7 that the data necessary for the effect
process has not been received (S7: No), the process returns to S3.
[0063]
Next, processing in the DSP 22 will be described. Here, two methods, that is, the method shown
in FIG. 11 and the method shown in FIG. 12 will be described.
[0064]
11 and 12, the RAM 22 a is a table in which the cutoff frequency and gain of the HSHV 50 and
the center frequency, gain and Q value of the band pass filter 52 are tabled according to discrete
values of engine load and rotational speed. Is stored as This table is stored in the ROM 12 and is
transferred by the CPU 10 in the process of S1 or S4 of the flowchart described in FIG. 10
according to the type of the selected vehicle. The filter A 22 b and the filter B 22 c shown in FIG.
11 and the filter 22 h shown in FIG. 12 are formed by the DSP 22, and the HSHV 50 and the
band pass filter 52 are arranged in series.
[0065]
FIG. 11 is a diagram schematically showing a first method of changing the frequency
characteristic in accordance with changes in engine load and rotational speed executed in the
DSP 22. As shown in FIG. In FIG. 11, when engine load and rotational speed are given, a filter
coefficient group consisting of cutoff frequency, gain and Q value in two states close to these
values is read out from the table stored in RAM 22a. One filter coefficient group 1 is supplied to
the filter A 22 b according to the control value set by the racer 42 and the bottom 44 which are
encoders, and at the same time, the other filter coefficient group 2 is supplied to the filter B 22 c.
The frequency characteristics of the input engine sound are changed by the filter A 22 b and the
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filter B 22 c, respectively, and are input to the cross fade mixing unit 22 d. The cross fade mixing
unit synthesizes and outputs the input automobile sound signal at a mixing ratio corresponding
to the given load and rotational speed of the engine.
[0066]
This makes it possible to change the characteristics of the filter in accordance with the load and
rotational speed of the engine.
[0067]
FIG. 12 is a method of interpolating parameters given to one filter, in contrast to the method of
switching the filter described with reference to FIG.
Given the load and rotational speed of the engine, filter coefficient group 1 and filter coefficient
group 2 in two states close to these values are read from the table stored in RAM 22a, and
interpolation calculation is performed in coefficient interpolation unit 22g. The performed and
interpolated coefficients are provided to the filter 22h.
[0068]
Although FIGS. 11 and 12 have described that the table stores the filter coefficient group
corresponding to the engine load and the number of rotations, the table corresponds to the
respective values of the load, the number of rotations, and three parameters of the envelope
level. The filter coefficient group may be stored, the filter coefficient group may be determined
based on these three parameters, and the frequency characteristic may be changed by the filter
coefficient group.
[0069]
As described above, according to the vehicle sound processing apparatus of the present
embodiment, the frequency characteristic of the engine sound is changed according to the load,
the number of rotations of the engine, and the level of the engine sound. Can be preferred.
[0070]
The detection means for detecting the engine noise of a car according to claim 1 may be a sensor
such as a piezoelectric ceramic attached to an intake pipe or exhaust pipe of an engine or a
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muffler or a microphone installed in an engine room.
[0071]
As mentioned above, although the present invention was explained based on an example, the
present invention is not limited to the above-mentioned example at all, It is easy that various
improvement change is possible within the range which does not deviate from the meaning of
the present invention It can be guessed that.
[0072]
For example, in the above embodiment, the parameters of the HSHV 50 are changed according to
the envelope level of the engine sound, but instead of the HSHV 50, a low pass filter with
resonance, a high pass filter or a comb filter may be used.
[0073]
Although the parameters of the HSHV 50 change according to the envelope level of the engine
sound, instead of the envelope level of the engine sound, the load of the engine, the number of
revolutions of the engine, or a combination thereof may be used.
The same applies to the band pass filter 52.
[0074]
Further, in the above embodiment, the frequency characteristic of the car sound input by the
filter is changed, but an effect such as a distortion that distorts the car sound may be added.
When the effect of distortion is given, the depth of distortion may be changed according to the
load of the engine.
[0075]
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It is the block diagram which showed the electric constitution of the automobile sound
processing device of the present invention.
It is a figure showing an operation panel.
It is a figure which shows the process performed by DSP.
It is a figure which shows a mode that the frequency characteristic of an engine sound is changed
according to the envelope level of an engine sound. It is a graph which shows the cutoff
frequency and gain of HSHV set according to the kind of preset, and is a graph which makes an
envelope level horizontal axis a gain of HSHV a vertical axis. It is a figure which shows a mode
that the frequency characteristic of an engine sound is changed according to the rotation speed
of an engine. It is a figure which shows the setting of the center frequency and gain of a band
pass filter according to the kind of preset. It is a figure which shows a mode that the parameter
of a band pass filter is changed according to the rotation speed of an engine. It is a figure
showing typically the 1st method of changing the frequency characteristic of engine sound
according to change of the load of engine and rotation speed which are performed in DSP which
is a flow chart showing processing which CPU performs according to a program according to a
program. It is a figure showing typically the 2nd method of changing the frequency characteristic
of engine sound according to the change of the load and the number of rotations of the engine
performed in DSP.
Explanation of sign
[0076]
DESCRIPTION OF SYMBOLS 10 CPU 12 ROM 14 RAM 16 interface 18 operation panel 20 sound
source 22 DSP (effect provision means) 26 sensor (detection means) 40 touch display (vehicle
type selection means) 42, 44, 46 encoder (operation element) 50 HSHV (effect provision means)
) 52 band pass filter (effect giving means)
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20
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