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JP2006207507

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DESCRIPTION JP2006207507
PROBLEM TO BE SOLVED: To adjust engine sound quality by performing analysis, evaluation and
correction of engine sound in detail and with high accuracy in all frequency ranges from low
frequency side to high frequency side, and realizing reduction of engine sound And provide the
device. SOLUTION: The sound quality adjustment means of an engine sound which records an
engine sound and inputs it to a controller, analyzes the engine sound in the controller, corrects
the sound quality, and reproduces and outputs this corrected sound, Wavelet analysis that
divides the engine sound into high frequency components and low frequency components, and
further repeatedly separates the high frequency components and low frequency components into
high frequency components and low frequency components. The packet analysis is performed to
obtain this wavelet. It is characterized in that the sound quality of the engine sound is corrected
based on the packet analysis result, and the sound quality correction sound including the sound
quality correction is reproduced and output. [Selected figure] Figure 1
Sound quality adjustment method of engine sound and device therefor
[0001]
The present invention relates to a method and an apparatus for adjusting the sound quality of an
engine sound, which analyzes an engine sound emitted from an engine in a controller to correct
the sound quality and reproduces and outputs the corrected sound.
[0002]
Although the sound quality of equipment generated sound such as engine sound emitted from an
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engine is analyzed and evaluated by a simulator, a technology for correcting the equipment
generated sound based on the evaluation result has been proposed in recent years. One of them
is the technology of Patent Document 1 (Japanese Patent Application Laid-Open No. 2000347677) according to the application of the present applicant.
In such a technique, the recording means for recording the generated sound of the target device,
and the changing means for changing the time and frequency components in the waveform of
the generated sound recorded by the recording means are provided. The frequency analysis is
performed using wavelet analysis in which a low frequency component is decomposed into a
frequency component and a low frequency component, and the low frequency component is
further decomposed into two different frequency components.
[0003]
Unexamined-Japanese-Patent No. 2000-347677
[0004]
The engine noise emitted from the engine ranges in frequency from low frequency large
amplitude noise such as exhaust noise and mechanical noise from valve gear to high frequency
noise such as intake noise and rotational noise of exhaust turbocharger. There is a wide range of
However, in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 2000-347677),
when frequency analysis of the sound generated from the device, the generated sound is
decomposed into high frequency components and low frequency components. Uses wavelet
analysis in which frequency analysis is repeatedly performed by further decomposing the low
frequency component side into two different frequency components.
[0005]
Therefore, when using the technology of Patent Document 1 for analysis and evaluation of
engine sound emitted from the engine, the engine sound has a frequency range from low
frequency large amplitude sound to high frequency sound as described above. Because it covers
a wide range, frequency components can be finely resolved on the low frequency side, and
frequency analysis and correction of the generated sound based on the analysis results can be
detailed and highly accurate, but because the resolution width is wide on the high frequency side,
Detailed analysis and correction of the high frequency noise such as the exhaust turbocharger
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noise is difficult.
[0006]
SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention
achieves reduction of engine sound by enabling analysis, evaluation and correction of engine
sound to be performed in detail and with high accuracy over the entire frequency range from low
frequency side to high frequency side. It is an object of the present invention to provide a method
and device for adjusting the sound quality of a possible engine sound.
[0007]
The present invention achieves such an object, records engine sound emitted from an engine,
inputs it to a controller, analyzes the engine sound in the controller, corrects the sound quality,
reproduces and outputs this corrected sound In the sound quality adjustment method of an
engine sound, the recorded engine sound is divided into a high frequency component and a low
frequency component, and each of the high frequency component and the low frequency
component is further divided into a high frequency component and a low frequency component.
Wavelet that repeatedly performs frequency analysis.
The packet analysis is performed to obtain this wavelet.
It is characterized in that the sound quality of the engine sound is corrected based on the packet
analysis result, and the sound quality correction sound including the sound quality correction is
reproduced and output.
[0008]
Also, the invention of an apparatus for carrying out the above method comprises: collecting
engine sound emitted from an engine by an engine sound recording means and inputting it to a
controller, analyzing the engine sound in the controller to correct the sound quality; In the sound
quality adjustment apparatus for engine sound configured to reproduce and output the sound,
the controller divides the engine sound from the engine sound recording means into high
frequency components and low frequency components, and the high frequency components and
low frequency components A wavelet that performs frequency analysis by repeatedly dividing
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each of the frequency components into high frequency components and low frequency
components. A packet analysis operation unit, and the wavelet. A sound quality correction unit
that corrects the sound quality of the engine sound based on an analysis result in the packet
analysis operation unit, and a sound wave reproduction unit that reproduces and outputs a sound
quality correction sound including the correction in the sound quality correction unit. It is
characterized by
[0009]
According to this invention, the engine sound recorded by the engine sound recording means is
the wavelet of the controller. A wavelet analysis unit that divides the engine sound into high
frequency components and low frequency components, and further separates the high frequency
components and low frequency components into high frequency components and low frequency
components. By performing frequency analysis by packet analysis, in addition to the detailed
frequency analysis of the low frequency component of the engine sound, it is possible to perform
the detailed frequency analysis also for the high frequency component. Therefore, as in the prior
art, the resolution width in the high frequency range is wide, and the problem that detailed
analysis and correction of the sound on the high frequency side such as the noise generated by
the exhaust turbocharger is difficult can be solved. Frequency analysis of engine sound with a
wide range of frequency from low frequency sound such as mechanical sound from valve device
to high frequency sound such as exhaust turbo charger sound and engine based on the frequency
analysis result Sound correction can be performed in detail and with high accuracy in all
frequency ranges, and engine noise can be reduced.
[0010]
Further, according to the present invention, in the sound quality adjustment method of the
engine sound, an engine event (equipment essential point) which is a generation factor of noise
in the engine is input to the controller, and the wavelet. An engine event requiring sound quality
correction and a sound quality correction amount of the engine event are calculated based on a
frequency analysis result by packet analysis and a vibration characteristic of the engine event. In
this invention, preferably, a change point of the structure or the specification of the engine event
is determined based on the sound quality correction amount in the controller.
[0011]
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Further, the invention of an apparatus for carrying out the method includes an engine event
input means for inputting to the controller an engine event (equipment essential point) which is a
generation factor of noise in the engine. An engine event requiring sound quality correction and
a sound quality correction amount of the engine event are calculated based on the frequency
analysis result from the packet analysis operation unit and the engine event from the engine
event input means. Do.
[0012]
According to this invention, the engine sound recorded by the engine sound recording means is
divided into wavelets in the controller. Packet analysis or wavelet analysis on the low frequency
side is performed, and this frequency analysis result is compared with vibration characteristics
such as the natural frequency of an engine event such as a valve gear from an engine event input
means, an exhaust turbocharger, etc. That is, the wavelet. The vibration waveform of the
frequency analysis result by packet analysis or wavelet analysis is compared with the vibration
characteristic (such as natural frequency) of the engine event, and the engine event having the
vibration characteristic resonating with the vibration waveform of the frequency analysis result is
extracted Thus, an engine event requiring sound quality correction can be identified, and the
sound quality correction amount of the engine event can be calculated from the relationship
between the vibration waveform of the frequency analysis result and the vibration characteristic
of the engine event.
[0013]
Therefore, according to such an invention, the wavelet of the engine sound. By comparing the
frequency analysis result by packet analysis or wavelet analysis with the vibration characteristic
of the engine event, it is possible to easily extract an engine event that requires a change in the
sound quality of the generated sound, and a structure for changing the sound quality of the
engine event. And, it is possible to grasp the change point of the specification and to realize the
reduction of the engine noise as a result.
[0014]
According to the present invention, there is provided a wavelet which repeatedly divides an
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engine sound into a high frequency component and a low frequency component, and further
divides each of the high frequency component and the low frequency component into the high
frequency component and the low frequency component. By performing frequency analysis by
packet analysis, in addition to detailed frequency analysis of low frequency components of the
engine sound, detailed frequency analysis of high frequency components can be performed, and
the frequency range is wide. The frequency analysis of the engine sound and the correction of
the engine sound based on the frequency analysis result can be performed in detail and with high
accuracy in the entire frequency range, and the reduction of the engine sound can be realized.
[0015]
Also according to the invention, said wavelets of engine sound. By comparing the frequency
analysis result by packet analysis or wavelet analysis with the vibration characteristic of the
engine event, it is possible to easily extract an engine event that requires a change in the sound
quality of the generated sound, and a structure for changing the sound quality of the engine
event. And, it is possible to grasp the change point of the specification and to realize the
reduction of the engine noise as a result.
[0016]
Hereinafter, the present invention will be described in detail using embodiments shown in the
drawings. However, the dimensions, materials, shapes, relative positions, etc. of the component
parts described in this embodiment are not intended to limit the scope of the present invention to
only the specific description unless specifically described otherwise, and merely illustrative
examples It is only
[0017]
FIG. 1 is a block diagram showing an overall configuration of an engine sound quality adjusting
apparatus according to an embodiment (first and second embodiments) of the present invention.
In FIG. 1, 1 is an engine that is a sound source, 2 is an engine sound recording means that
records the engine sound emitted from the engine 1, 3 is a controller that performs control
operation described later, 4 is an exhaust pulsation of the engine 1 Engine event input means for
inputting to the controller 3 an engine event (equipment essential point) that causes noise in the
engine 1 such as pressure reaction, opening / closing timing of a valve gear, vibration
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characteristic of an exhaust turbocharger, etc. It is.
[0018]
In the sound quality adjusting apparatus of the engine sound, the engine sound emitted from the
engine 1 is recorded by the engine sound recording means 2, and the wavelets of the controller 3
are transmitted. The packet analysis operation unit 31 is input. The wavelet. The packet analysis
operation unit 31 divides the engine sound into high frequency components and low frequency
components as described in detail later, and further divides the high frequency components and
low frequency components into high frequency components and low frequency components,
respectively. Wavelet that repeats dividing. The frequency analysis is performed by packet
analysis, and the analysis result is input to the sound wave correction unit 32. In the sound wave
correction unit 32, the wavelets. The frequency analysis result from the packet analysis operation
unit 31 and the vibration characteristic (natural frequency etc.) of the engine event input from
the engine event input means 4 are compared, and the vibration characteristic resonates with the
vibration waveform of the frequency analysis result To extract the engine event that requires
sound quality correction, calculate the sound quality correction amount of the engine event from
the vibration waveform of the frequency analysis result and the vibration characteristic of the
engine event, and input it to the sound wave reproduction unit 33 Do. The sound wave
reproduction unit 33 rearranges the engine sound of the engine 1 in which the sound quality
correction amount of the engine event in the sound wave correction unit 32 is incorporated.
[0019]
Next, FIG. 2 is a control flow chart of an engine sound quality adjusting apparatus according to a
first embodiment of the present invention. It is a control flowchart of sound quality adjustment of
engine sound including packet analysis. In FIG. 2 and FIG. While inputting the engine sound of a
waveform as shown to (1) of FIG. 5 into the packet analysis part 31 (step (1)), the wavelet which
determines which frequency band (setting frequency band) this engine sound is decomposed into
is said . The packet is input to the packet analysis unit 31 (step (2)). The wavelet. In the packet
analysis unit 31, the wavelet of the engine sound is processed in the following procedure.
Perform packet analysis (step (3)).
[0020]
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Fig. 4 shows the wavelet. It is explanatory drawing of a packet analysis. In FIG. 4, the wavelets. In
packet analysis, the engine sound (frequency DC to 20 KHz) is first decomposed into high
frequency components of 10 to 20 KHz and low frequency components of DC to 10 KHz. The
high frequency component of 10 to 20 KHz is decomposed into a high frequency component of
15 to 20 KHz and a low frequency component of 10 to 15 KHz, and the low frequency
component of DC to 10 KHz is a high frequency component of 5 to 10 KHz and a low DC to 5
KHz It is decomposed into frequency components. Thus, the wavelet. The packet analysis
decomposes the engine sound (frequency DC to 20 KHz) into high frequency components (10 to
20 KHz) and low frequency components (DC to 10 KHz), and the high frequency components and
the low frequency components are further high frequency. The division into the component and
the low frequency component is repeated until the set frequency band. (2) of FIG. The state of the
engine sound waveform by packet analysis is shown.
[0021]
Then, based on the correction factor of the engine sound, the time zone, the frequency band, and
the correction value for correcting the engine sound are input to the sound wave correction unit
32 (step (4)). The sound quality is corrected corresponding to the correction information of the
sound quality designated in (step (5)). Next, in the sound wave reproduction unit 33, the engine
sound of the engine 1 incorporating the sound quality correction amount in the sound wave
correction unit 32 is reorganized to reproduce the engine sound (steps (6), (7)).
[0022]
According to the first embodiment, the engine sound recorded by the engine sound recording
means 2 is compared with the wavelets of the controller 3. The packet analysis operation unit 31
divides the engine sound (in this example, frequency DC to 20 KHz) into high frequency
components and low frequency components (in this example, high frequency components of 10
to 20 KHz and low frequency components of DC to 10 KHz) And Wavelet repeating repeating
division of each of the high frequency component and the low frequency component into the
high frequency component and the low frequency component. By performing frequency analysis
by packet analysis, in addition to the detailed frequency analysis of the low frequency component
of the engine sound, it is possible to perform the detailed frequency analysis also for the high
frequency component. Therefore, as in the prior art, it is possible to solve the problem that
detailed analysis and correction of the high frequency noise such as the exhaust turbocharger
noise is difficult because the resolution width in the high frequency region is wide and exhaust
noise Based on the frequency analysis of engine noise whose frequency range is wide and the
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frequency analysis results from low frequency noise such as mechanical noise from valve gear to
high frequency noise such as exhaust turbocharger noise The correction of the engine sound can
be performed in detail and with high accuracy in the entire frequency range, and the reduction of
the engine sound can be realized.
[0023]
FIG. 3 is a control flow chart of an engine sound quality adjusting apparatus according to a
second embodiment of the present invention. It is a control flowchart of sound quality
adjustment of engine sound including packet analysis or wavelet analysis. FIG. 5 is an
explanatory view of frequency analysis, sound quality correction and sound quality
reorganization in the first and second embodiments. In FIG. 3 and FIG. An engine sound having a
waveform as shown in (1) of FIG. 5 is input to the packet analysis unit 31 (step (1)). Next, the
engine event input means 4 causes the engine 1 to generate noise in the engine 1 such as
exhaust pulsation (exhaust pressure reaction) of the engine 1, opening / closing timing of the
valve gear, vibration characteristics of the exhaust turbocharger, etc. An event (equipment
essential point) is input to the sound wave correction unit 32 of the controller 3 (step (2)).
[0024]
Then, the wavelet. In the packet analysis unit 31, the wavelets of the engine sound are processed
in the same procedure as the first embodiment. Packet analysis or wavelet analysis, that is, the
above-mentioned engine sound is decomposed into high frequency components and low
frequency components, and then the frequency analysis is repeated by further dividing the low
frequency component side into two different frequency components ( Step (3)), the wavelet. The
packet analysis result (or the wavelet analysis result) is output in the form of a graph as shown in
(2) of FIG. 5 (step (4)).
[0025]
Then, the vibration characteristic (the example of graph output in FIG. 5) in the engine event
input by the engine event input means 4 and the wavelets displayed graphically as shown in (2)
of FIG. By comparing with the packet analysis result (or wavelet analysis result), a frequency
range (for example, Z1 in FIG. 5 (2)) resonating with the vibration waveform of the frequency
analysis result is extracted, and the sound quality of the frequency range is corrected. As shown
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by Z2 in FIG. 5 (2), the amplitude is reduced (step (5)). The sound wave reproduction unit 33
reproduces the engine sound by reorganizing the engine sound incorporating the correction
amount of the sound quality made as described above.
[0026]
According to the second embodiment, the controller sound of the engine sound recorded by the
engine sound recording means 2 is divided into wavelets. Packet analysis (or wavelet analysis on
the low frequency side) is performed, and the frequency analysis result is used as the vibration
characteristics (natural frequency etc.) of the engine event such as the valve gear from the engine
event input means 4 and the exhaust turbocharger. Contrast, that is, the wavelet. The vibration
waveform of the frequency analysis result by packet analysis or wavelet analysis is compared
with the vibration characteristic (such as natural frequency) of the engine event, and the engine
event having the vibration characteristic resonating with the vibration waveform of the
frequency analysis result is extracted Thus, an engine event requiring sound quality correction
can be identified, and the sound quality correction amount of the engine event can be calculated
from the relationship between the vibration waveform of the frequency analysis result and the
vibration characteristic of the engine event. Thus, said wavelet of engine sound. By comparing
the frequency analysis result by packet analysis or wavelet analysis with the natural frequency of
the engine event, it is possible to easily extract an engine event that requires a change in the
sound quality of the generated sound and to change the sound quality of the engine event.
Changes in structure and specifications can be identified, and as a result, engine noise can be
reduced.
[0027]
According to the present invention, engine sound analysis, evaluation, and correction can be
performed in detail and with high accuracy in the entire frequency range from the low frequency
side to the high frequency side, and an engine sound that can reduce engine sound can be
realized. A sound quality adjustment method and apparatus thereof can be provided.
[0028]
FIG. 1 is a block diagram showing an entire configuration of an engine sound quality adjusting
device according to first and second embodiments of the present invention.
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It is a control flowchart of the tone adjustment device for an engine sound according to the first
embodiment of the present invention. It is a control flowchart of the tone adjustment device for
an engine sound according to a second embodiment of the present invention. The wavelets in the
first and second embodiments. It is explanatory drawing of a packet analysis. It is explanatory
drawing of the frequency analysis in the said 1st, 2nd Example, sound quality correction, and
sound quality reorganization.
Explanation of sign
[0029]
1 Engine 2 Engine Sound Recording Means 3 Controller 4 Engine Event Input Means 31 Wavelet.
Packet analysis operation unit 32 Sound wave correction unit 33 Sound wave reproduction unit
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