JPH08286675A - Noise control device - Google Patents

Abstract

PURPOSE: To simplify a constitution by using an adaptive filter for timbre control of noises. CONSTITUTION: A target signal having a desired frequency spectrum is inputted to a noise control device provided with a loudspeaker 4 outputting timbre control sounds which control the noise timbre of a power source 1, and a microphone 5 which forms an error signal by detecting the controlled timbre noises obtained from noise control by timbre control sounds, and the noise control device is also provided with a timbre control part 8 including an adaptive filter outputting a tone control signal to the loudspeaker 4 for a timbre control by which the error signal coincides with the target signal. A target signal forming means 9 connected with the timbre control part 8 forms the target signal to output. A degree setting part 10 sets the target signal forming means 9 at the degree of the frequency spectrum of the target signal. A sound pressure setting part 11 sets the target signal forming part 9 at a sound pressure of the frequency spectrum of the target signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise control device for controlling the tone color of noise.

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field, a noise control device for canceling noise is known as follows. FIG. 21 is a diagram showing a conventional noise control device that cancels noise. As shown in the figure, a cancel space 3 is provided in a stage subsequent to the muffler 2 that consumes the acoustic energy of the exhaust gas from the engine 1, which is a power source. A speaker 4 that outputs a cancel sound that cancels noise from the muffler 2 is provided in the cancel space 3. This cancellation sound is equal to the noise level and is in antiphase with the noise phase. Due to interference between the noise from the muffler 2 and the speaker 4, the level of the noise from the muffler 2 is reduced and the residual noise is emitted from the tail pipe 3-1 to the outside air. A microphone 5 is provided near the residual noise emitted to the outside air, and the microphone 5 converts the residual noise into an error signal Sm (n). A power source such as a motor may be used instead of the engine 1, and in this case, the muffler 2 will be an air conditioning duct or the like instead. The same applies hereinafter.

An adaptive filter 6 for forming a cancel signal Sc (n) for outputting a cancel sound to the speaker 4 receives a reference signal which is a controlled signal, and a non-cyclic filter FIR (Finite) whose filter coefficient is variable. Impulse R
esponse). The filter coefficient updating unit 7 which receives the error signal and the reference signal from the microphone 5 controls the variable filter coefficient of the adaptive filter 6 so that the error signal is minimized. The adaptive filter 6 and the filter coefficient updating unit 7 are DSPs (Digital Signal Proces).
sor).

FIG. 22 is a diagram showing the structure of the adaptive filter shown in FIG. As shown in the figure, the adaptive filter 6 is provided with a plurality of delay devices for inputting the reference signal q (n) and sequentially delaying the reference signal q (n), each of the delay devices being provided with a multiplier, and the output of the multiplier. Is added to form a cancellation signal. Here, the multiplication coefficients (filter coefficients) of each of the plurality of multipliers are C0, C1, C2, ..., Ck.

In the filter coefficient updating unit 7 shown in FIG.
The multiplication coefficient is updated as follows. Cp (n + 1) = Cp (n) + α × q (np) × Sm (n) (p = 0,1,2,
…, K) where α is the convergence coefficient. FIG. 23 is a diagram showing frequency components of noise before and after noise control. As shown in FIG. 4A, the frequency component before control is assumed to be composed of a primary frequency f1 and secondary and tertiary frequencies f2 and f3 of this harmonic component. By the noise control device, the frequency spectrum (component) before the noise control shown in this figure (a) becomes the frequency spectrum after the noise control shown in this figure (b). As described above, the adaptive filter used in the noise control device simultaneously extracts the frequency components of noise as a unit, adjusts the phase of the extracted frequency components, and adjusts the output level of the extracted frequency components. Is going.

By the way, the sound emitted from the muffler 2 includes an exhaust note, which is a sound that is appropriately intense and pleasant and does not generate noise, and an exhaust noise, which is a sound of noise, in contrast to this. For example, it is not so quiet and an exhaust note is required. However, since the electronic muffler such as the noise control device described above has only the purpose of canceling the exhaust,
Not only the noise but also the exhaust note will be canceled.

As a tone color control device for controlling the frequency spectrum of such noise, there is an automobile exhaust tone color improvement device described in Japanese Patent Laid-Open No. 4-56644. This device includes a first rotation synchronization filter that extracts an exhaust sound caused by the engine speed for each frequency component, and an exhaust gas caused by the engine speed of a combined sound of an exhaust sound and a sound from a speaker. A second rotary synchronous filter that extracts a synthetic sound for each frequency component of the sound, a phase adjustment device that matches the phase of the pass signal of the first rotary synchronous filter and the phase of the pass signal of the second synchronous filter, and the extracted synthetic It describes that the gain of the amplifier of the speaker is adjusted by comparing the sound level and the target exhaust discharge sound pressure level.

[0008]

However, the structure of the one disclosed in the above publication is such that the engine noise frequency component of the first rotary synchronous filter is extracted, the phase of the extracted frequency component is adjusted, and the amplifier gain of the speaker is controlled. However, there is a problem that the configuration is complicated and the configuration is complicated. By the way, the configuration of the adaptive filter used in the noise control device of FIG. 21 is such that the extraction of the noise frequency component of the engine, the phase adjustment of the extracted frequency component, and the control of the output level to the speaker are integrated. There is a problem that the configuration of the tone color control should be simplified by using.

Therefore, in view of the above problems and problems, it is an object of the present invention to provide a noise control device capable of controlling a tone color using an adaptive filter and simplifying the structure.

[0010]

In order to solve the above problems, the present invention provides a noise control device having the following configuration. That is, a noise control device having a speaker for outputting a tone color control sound for controlling a tone color of noise of a power source, and a microphone for detecting a tone color control noise in which the noise is controlled by the tone color control sound and forming an error signal. In addition, a tone color control unit including an adaptive filter for inputting a target signal having a frequency spectrum to be targeted and outputting a tone color control signal to a speaker for performing tone color control such that the error signal matches the target signal. Is provided. Target signal forming means connected to the tone color control section forms and outputs the target signal. The order setting unit sets the order of the frequency spectrum of the target signal in the target signal forming means. The sound pressure setting unit sets the sound pressure of the frequency spectrum of the target signal in the target signal forming means.

A rotation speed detector for detecting the rotation speed of the power source is provided, and the order setting of the frequency spectrum of the target signal of the order setting section and the target signal of the sound pressure setting section are provided to the target signal forming means. The sound pressure setting of the frequency spectrum may be changed using the rotation speed as a parameter. A rotation speed detector that detects the rotation speed of the power source, a transfer characteristic simulation unit that simulates acoustic transfer characteristics between a speaker and a microphone, a tone color control signal that has passed through the transfer characteristic simulation unit, and the error signal. And an addition unit that forms a reproduced noise signal that reproduces the noise of the power source, and sets the order of the frequency spectrum of the target signal of the order setting unit to the target signal forming unit by the rotation speed. May be changed as a parameter, and the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit may be changed using the reproduced noise signal level of the adding unit as a parameter.

Instead of the addition section of the transfer characteristic section, the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting section is changed with respect to the target signal forming means by using the accelerator opening of the power source as a parameter. You may. Instead of the adding unit of the transfer characteristic unit, the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit may be changed with respect to the target signal forming unit using the engine load of the power source as a parameter. .

In place of the adding section of the transfer characteristic section, the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting section is changed with respect to the target signal forming means by using the vehicle speed of the power source as a parameter. Good. Instead of the adding unit of the transfer characteristic unit, the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit may be changed with respect to the target signal forming unit using the drive range of the power source as a parameter. .

Instead of the adding section of the transfer characteristic section, the other-vehicle information having the tone color characteristic of the noise of another vehicle based on the number of rotations of the number-of-revolutions detecting section is used to set the order setting section for the target signal forming means by the other-vehicle information. The order setting of the frequency spectrum and the sound pressure setting of the sound pressure setting unit may be changed. A rotation speed detector that detects the rotation speed of the power source, and a user interface that is connected to the order setting unit and the sound pressure setting unit are provided, and the target of the order setting unit with respect to the target signal forming unit. The order setting of the frequency spectrum of the signal and the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit are changed by using the rotation speed as a parameter, and the changed setting is changed by the user interface. Good.

[0015]

According to the noise control device of the present invention, a target signal having a frequency spectrum to be targeted is input, and tone color control is performed so that the error signal matches the target signal. The target signal is output to the speaker, and the target signal is formed and output. The order of the frequency spectrum of the target signal is set in the target signal forming means,
By setting the sound pressure of the frequency spectrum of the target signal in the target signal forming means, it is possible to extract the noise frequency component of the power source, adjust the phase of the extracted frequency component, and control the output level to the speaker. As a result, the configuration of tone color control is simplified. The order setting of the frequency spectrum of the target signal and the sound pressure setting of the frequency spectrum of the target signal are changed, for example, using the rotation speed as a parameter, of which the sound pressure setting of the frequency spectrum is a reproduced noise signal of the adding unit. Level, power source accelerator opening, engine load, vehicle speed, drive range are changed as parameters.Furthermore, based on the number of revolutions of the number of revolutions detection unit, the frequency spectrum of the other vehicle has timbre characteristics of noise of other vehicles. The order setting and the sound pressure setting of the sound pressure setting section are changed, and the changed setting is changed by the user interface, so that the order and the sound pressure frequency of the frequency spectrum of the exhaust sound corresponding to the target signal are changed. Creates a spectrum, removes exhaust noise, and obtains the desired exhaust note Door can be.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a noise control device according to a first embodiment of the present invention. In this figure, a configuration different from that of FIG. 21 is that the tone color control section 8 forms a tone color control signal for outputting to the speaker 4 a tone color control sound for controlling the order of the noise frequency spectrum and the sound pressure, and the tone color control section. Target signal forming section 9 for forming a target signal having a target frequency spectrum order and sound pressure for controlling the tone color.
And a sound pressure setting unit 11 that sets the sound pressure of this frequency spectrum, and an order setting unit 10 that sets a desired frequency spectrum order for the target signal forming unit 9.
FIG. 2 is a diagram showing the configuration of the tone color control section 8 of FIG. As shown in the figure, the difference from the configurations of the adaptive filter 6 and the filter coefficient updating unit 7 of FIG. 21 is that an adding means 17 is provided on the error signal input side of the filter coefficient updating unit 7. The error signal Sm (n) from the microphone 5 and the inverted signal of the target signal T (n) from the target signal forming unit 9 are input to the adding means 17, and a combined signal E (n) of these signals is input.
Is input to the filter coefficient updating unit 7. Therefore, the following relational expression holds as E (n) =-T (n) + Sm (n). Since the adaptive filter 6 operates so that E (n) = 0 and controls the timbre of noise, E (n) = − T (n) + Sm (n) = 0, that is, Sm (n) = Let T (n). Therefore, the target signal forming means 9 makes the error signal obtained by converting the tone-color-controlled noise at the position of the microphone 5 approximate to the target signal, and enables adjustment of the tone color of the tone-color-controlled noise.

FIG. 3 is a diagram showing the configuration of the target signal forming means 9 of FIG. As shown in this figure, the target signal forming means 9
Is an angular velocity storage unit 91 for storing angular velocity ω data, a plurality of variable angular velocity storage units 92, 93, 94 for storing a plurality of variable angular velocities obtained by multiplying the angular velocity ω (2πf) data by the order of the frequency spectrum. A plurality of sine wave generators 95, 96, 97 for generating a sine wave corresponding to a variable angular velocity
And multiplying units 98, 99, 100 for controlling the amplitude of the sine waves output from the plurality of sine wave generating units 95, 96, 97.
And an adder 101 for adding the outputs of the multipliers 98, 99 and 100 and outputting the result to the timbre controller 8. The order setting unit 10 sets the orders k1, k2, k3 of the frequency spectrum.
Is input, a plurality of variable angular velocity storage units 92, 93,
For example, angular velocity data, ω × k1, ω × k2, ω × k3, are stored in 94, respectively. Furthermore, the sine wave generators 95, 96, 97
Then, for example, sine wave data, sin (ω × k1), sin (ω × k2), sin (ω
Xk3) occurs. In addition, the sound pressure setting units 11 set sound pressure coefficients g1, g2, g3 in order to set the sound pressure of the frequency spectrum.
Is inputted, the sine wave data are respectively calculated by the multiplication units 98, 99 and 100 as g1 · sin (ω × k1) and g2 · sin (ω × k
2), g3 · sin (ω × k3), and the addition data T obtained by adding these data in the addition unit 101 is T = g1 · sin (ω × k1) + g2 · sin (ω × k
2) + g3 · sin (ω × k3), which is output to the tone color control unit 8.

FIG. 4 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the first embodiment. A tone control sound is output from the speaker 4 in the cancellation space 3,
As a result of noise and interference, the to-be-controlled color noise obtained by the microphone 5 at the noise outlet of the tail pipe 3-1 is, as shown in this figure, based on the order setting pattern of the frequency spectrum, the frequency peak (f1 <f2 It is possible to adjust to an exhaust sound of a tone color having a desired frequency spectrum such that the sound pressure peak decreases (p1>p2> p3) with the increase of <f3).

Therefore, according to the present embodiment, the order of the frequency spectrum of the exhaust sound corresponding to the target signal having the order and the sound pressure setting pattern of the frequency spectrum set through the order setting unit 10 and the sound pressure setting unit 11 is obtained. The order and the sound pressure frequency spectrum can be obtained, and the exhaust noise can be removed, and a desired exhaust note can be obtained.

Next, since the desired exhaust note differs depending on the driving state of the vehicle, the order setting unit 10 and the sound pressure setting unit 11 fix the order and sound pressure settings for the target signal forming unit 9 to a fixed value. Instead, an example depending on the operating state will be described. FIG. 5 is a diagram showing a noise control device according to a second embodiment of the present invention. In this figure, a configuration different from that of the first embodiment of FIG. 1 is a rotation speed detection unit 12 that detects the rotation speed Ne of the engine 1. The rotation speed detection unit 12 determines the rotation frequency f from the rotation speed of the engine. The angular velocity ω is obtained via the angular velocity ω, and this angular velocity is calculated as the angular velocity storage unit 91 of the target signal forming unit 9.
Set to. Further, the rotation speed detection unit 12 determines the rotation speed N
e is output to the order setting unit 10 and the sound pressure setting unit 11. In this case, the order setting unit 10 and the sound pressure setting unit 11 set the order of the frequency spectrum using the rotation speed Ne as a parameter, for example, k1 (Ne), k2 (Ne), k3 (Ne).
Pattern and sound pressure coefficient setting, eg g1 (Ne), g2
(Ne), g3 (Ne) pattern is changed.

FIG. 6 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the second embodiment. As shown in this figure (a), when the number of revolutions is Ne1, the tone control color noise has its frequency peak (f1 <f2 <f3) increasing and its sound pressure peak decreasing (p1>p2> p3). Can be adjusted to the desired exhaust tone color. As shown in this figure (b), when the rotation speed is Ne2, the tone color control noise has its frequency peak (f1 '<f2'<f.
3 ') increase, the sound pressure peak is almost constant (p1' ≈ p
It can be adjusted to a desired exhaust tone color such that 2′≈p3 ′). Here, for example, Ne1 <Ne2.

Therefore, according to this embodiment, the target signal is set by the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level, so that the order of the frequency spectrum of the exhaust sound and the sound pressure are based on each revolution. Different frequency spectrum orders and sound pressures can be realized, exhaust noise can be removed, and a desired exhaust note can be formed. FIG. 7 is a diagram showing a noise control device according to a third embodiment of the present invention. In this figure, the configuration different from that of the second embodiment of FIG. 5 simulates the spatial transfer characteristic Hd1 of the sound from the speaker 4 to the microphone 5 and allows the tone color control signal output from the tone color control unit 8 to pass therethrough. The transfer characteristic simulating unit 13 that affects the spatial transfer characteristic of the sound is calculated, and the output of the transfer characteristic simulating unit 13 and the error signal and the difference signal from the microphone 5 are calculated to simulate uncontrolled noise in the microphone 5. It is the addition unit 14 that forms the source noise RNoise. The output of the adding unit 14 is output to the sound pressure setting unit 10. Here, the rotation speed detection unit 12 sets the angular speed in the angular speed storage unit 91 of the target signal formation unit 9, and outputs the rotation speed Ne to the order setting unit 10. In this case, the order setting unit 10
Is the order setting of the frequency spectrum using the rotation speed Ne as a parameter, for example, k1 (Ne), k2 (Ne), k3 (N
The pattern of e) is changed, and the sound pressure setting unit 11 causes the source noise RN
Sound pressure coefficient setting proportional to the average value of sound pressure of oise, for example, g1 (RNoise), g2 (RNoise), g3
Change the pattern of (RNoise).

FIG. 8 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the third embodiment. As shown in this figure (a), the average value of the source noise sound pressure is RNois.
In the case of e1, the tone color control noise is adjusted to a desired tone color of the exhaust sound such that the sound pressure peak decreases (p1>p2> p3) as the frequency peak (f1 <f2 <f3) increases. obtain. As shown in this figure (b), when the average value of the source noise sound pressure is RNoise2, the tone color control noise shows a sound pressure peak with an increase in its frequency peak (f1 ′ <f2 ′ <f3 ′). Decrease (p1 '>p2'> p3 ')
However, the tone color of the desired exhaust sound can be adjusted such that p1 ′> p1, p2 ′> p2, p3 ′> p3. here,
RNoise1 <RNoise2, f1 <f1 ′,
Let f2 <f2 'and f3 <f3'.

Therefore, according to the present embodiment, the target signal is set with the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the average value of the source noise sound pressure, whereby the frequency of the exhaust sound is increased. The order and the sound pressure of the spectrum can realize the order sound pressure of the frequency spectrum which is different based on the rotation and the source noise sound pressure, the exhaust noise can be removed, and a desired exhaust note can be formed.

FIG. 9 is a diagram showing a noise control device according to a fourth embodiment of the present invention. In this figure, the configuration different from that of the third embodiment of FIG. 7 is that the transfer characteristic simulating section 13 and the adding section 1 are provided.
Instead of 4, the accelerator information is output to the sound pressure setting unit 11. In this case, the sound pressure setting unit 11 changes, for example, a sound pressure coefficient setting, for example, a pattern of g1 (accelerator opening), g2 (accelerator opening), g3 (accelerator opening) using the accelerator opening as a parameter.

FIG. 10 is a diagram showing the frequency spectrum of the tone-color-controlled noise by the tone color control of the fourth embodiment. As shown in this figure (a), when the accelerator opening is 1, the tone color control noise has a sound pressure peak decreasing (p1>p2> p3) along with an increase in its frequency peak (f1 <f2 <f3). Can be adjusted to the desired exhaust tone color. As shown in this figure (b), when the accelerator opening is 2, the to-be-controlled color noise has its frequency peak (f1 '<f2'<f.
3 ') increase, the sound pressure peak decreases (p1'> p2 '
> P3 ') and p1'> p1, p2 '> p2, p3'>
It can be adjusted to a desired exhaust tone color such as p3. Here, accelerator opening 1 <accelerator opening 2 and f
1 <f1 ′, f2 <f2 ′, and f3 <f3 ′.

Therefore, according to this embodiment, by setting the target signal with the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the accelerator opening,
The order and sound pressure of the frequency spectrum of the exhaust sound can be realized based on the rotation and the accelerator opening, and the order sound pressure of the frequency spectrum can be realized, the exhaust noise can be removed, and a desired exhaust note can be formed.

FIG. 11 is a diagram showing a noise control system according to the fifth embodiment of the present invention. In the figure, the configuration different from that of the third embodiment of FIG. 7 outputs engine load (torque) information to the sound pressure setting unit 11 instead of the transfer characteristic simulating unit 13 and the adding unit 14. In this case, the sound pressure setting unit 11 sets the sound pressure coefficient, for example, g1 (accelerator opening), g2 (accelerator opening), g using the engine load as a parameter.
Change the pattern of 3 (accelerator opening).

FIG. 12 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone-color control of the fifth embodiment. As shown in this figure (a), in the case of engine load 1, the sound pressure control noise decreases the sound pressure peak (p1>p2> p3) as the frequency peak (f1 <f2 <f3) increases. Can be adjusted to a desired exhaust tone. As shown in this figure (b), in the case of the engine load 2, the to-be-controlled color noise has its frequency peak (f1 '<f2'<f.
3 ') increase, the sound pressure peak decreases (p1'> p2 '
> P3 ') and p1'> p1, p2 '> p2, p3'>
It can be adjusted to a desired exhaust tone color such as p3. Where engine load 1 <engine load 2 and f
1 <f1 ′, f2 <f2 ′, and f3 <f3 ′.

Therefore, according to this embodiment, by setting the target signal with the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the engine load,
The order and sound pressure of the frequency spectrum of the exhaust sound can be realized based on the rotation and the engine load, and the order sound pressure of the frequency spectrum can be realized, the exhaust noise can be removed, and a desired exhaust note can be formed.

FIG. 13 is a diagram showing a noise control system according to the sixth embodiment of the present invention. In this figure, the configuration different from that of the third embodiment of FIG. 7 outputs vehicle speed information to the sound pressure setting unit 11 instead of the transfer characteristic simulating unit 13 and the adding unit 14. In this case, the sound pressure setting unit 11 sets the sound pressure coefficient, for example, g1 (vehicle speed), g2, using the vehicle speed as a parameter.
Change the pattern of (vehicle speed) and g3 (vehicle speed).

FIG. 14 is a diagram showing the frequency spectrum of the tone-color-controlled noise caused by the tone color control of the sixth embodiment. As shown in the figure (a), when the vehicle speed is 1, the sound pressure control noise is such that the sound pressure peak decreases (p1>p2> p3) along with the increase of the frequency peak (f1 <f2 <f3). It can be adjusted to the desired exhaust tone color. As shown in this figure (b), when the vehicle speed is 2, the tone color control noise has its frequency peak (f1 '<f2'<f3') increasing and its sound pressure peak decreasing (p1'> p2 '). > P3 ') and then p1'>
It can be adjusted to a desired exhaust tone color such that p1, p2 '> p2, p3'> p3. Here, vehicle speed 1 <vehicle speed 2, f1 <f1 ′, f2 <f2 ′, and f3 <f3 ′.

Therefore, according to the present embodiment, the target signal is set at the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the vehicle speed. Can realize order sound pressure of different frequency spectrum based on rotation and vehicle speed, remove exhaust noise, and form a desired exhaust note.

FIG. 15 is a diagram showing a noise control system according to the seventh embodiment of the present invention. In the figure, in the configuration different from the third embodiment of FIG. 7, the drive range information is output to the sound pressure setting unit 11 instead of the transfer characteristic simulating unit 13 and the adding unit 14. In this case, the sound pressure setting unit 11 sets the sound pressure coefficient, for example, g using the drive range as a parameter.
1 (drive range), g2 (drive range), g3
Change the (drive range) pattern.

FIG. 16 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the seventh embodiment. As shown in FIG. 3A, in the case of drive range 1, the tone color control noise has its frequency peak (f1 <f2 <f3).
Can be adjusted to a desired timbre of the exhaust sound such that the sound pressure peak decreases (p1>p2> p3) with the increase of the. As shown in this figure (b), in the case of the drive range 2, the to-be-controlled color noise has its frequency peak (f1 '<f2'<f.
3 ') increase, the sound pressure peak decreases (p1'> p2 '
> P3 ') and p1'> p1, p2 '> p2, p3'>
It can be adjusted to a desired exhaust tone color such as p3. Here, drive range 1 <drive range 2, and f1 <f1 ′, f2 <f2 ′, and f3 <f3 ′.

Therefore, according to this embodiment, by setting the target signal at the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the drive range,
The order and sound pressure of the frequency spectrum of the exhaust sound can be realized based on the rotation and the drive range, and the order sound pressure of the frequency spectrum can be realized, exhaust noise can be removed, and a desired exhaust note can be formed.

FIG. 17 is a diagram showing a noise control device according to the eighth embodiment of the present invention. In this figure, the configuration different from that of the third embodiment of FIG. 7 is that instead of the transfer characteristic simulation unit 13 and the addition unit 14, other vehicle information that stores the tone color characteristics of noise of other vehicles, such as sports cars and luxury cars, is stored. The other-vehicle information unit 15 uses the rotation speed Ne as a parameter to set the order of the frequency spectrum, for example, k1 ′ (Ne), k.
2 ′ (Ne), k3 ′ (Ne) patterns and corresponding sound pressure coefficient settings, for example, g1 ′ (Ne), g2 ′ (N
e), g3 '(Ne) pattern is changed.

FIG. 18 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the eighth embodiment. As shown in this figure (a), the sound pressure of the frequency spectrum which is the target of noise of other sports cars, luxury cars, etc. is given to the target signal forming section 9 by the other vehicle information section 15, and this figure (b) ), The tone-color-controlled noise that is the same as the target signal in FIG.

Therefore, according to the present embodiment, the target signal is set to the order of the frequency spectrum corresponding to the number of revolutions and the sound pressure level corresponding to the other vehicle. Pressure can realize order sound pressure of different frequency spectrum based on rotation and noise characteristics of other vehicles, exhaust noise can be removed, and desired exhaust note can be formed.

FIG. 19 is a diagram showing a noise control system according to the ninth embodiment of the present invention. In this figure, the configuration different from the third embodiment in FIG. 7 is a user interface 16 instead of the transfer characteristic simulating unit 13 and the adding unit 14.
The order setting of the frequency spectrum determined by the rotation speed detector 12, for example, k1 (Ne), k, is arbitrarily performed by the user via the user interface 16.
2 (Ne), k3 (Ne) patterns are changed, and further sound pressure coefficient settings, for example, g1 (Ne), g2 (Ne), g
The 3 (Ne) pattern is changed.

FIG. 20 is a diagram showing the frequency spectrum of the tone-color-controlled noise generated by the tone color control of the ninth embodiment. As shown in this figure (a), the sound pressure of the frequency spectrum which is the target of the noise arbitrarily set by the user by the user interface 16 is given to the target signal forming section 9, and as shown in this figure (b). , The tone-color-controlled noise that is the same as the target signal in FIG.

Therefore, according to the present embodiment, the user can arbitrarily set the order of the frequency spectrum and the sound pressure of the target signal, and the order and the sound pressure of the frequency spectrum of the desired exhaust sound can be realized and the exhaust The noise can be removed and the desired exhaust note is formed. In addition,
Similarly in the first to eighth embodiments, the order of the frequency spectrum and the setting pattern of the sound pressure may be changed by overlapping with the user interface 16.

[0043]

As described above, according to the present invention, a target signal having a frequency spectrum to be targeted is input, and tone color control is performed so that the error signal matches the target signal. A control signal is output to a speaker, the target signal is formed and output, the order of the frequency spectrum of the target signal is set in the target signal forming means, and the sound pressure of the frequency spectrum of the target signal is formed as the target signal. Since it is set to the means, the extraction of the noise frequency component of the power source, the phase adjustment of the extracted frequency component, and the control of the output level to the speaker will be performed integrally, and the configuration of the tone color control will be simplified. To do. The order setting of the frequency spectrum of the target signal and the sound pressure setting of the frequency spectrum of the target signal are changed, for example, using the rotation speed as a parameter, of which the sound pressure setting of the frequency spectrum is a reproduced noise signal of the adding unit. Level, accelerator opening of power source, engine load, vehicle speed, drive range are changed as parameters, and frequency spectrum order setting and sound pressure setting of the sound pressure setting section are changed by other vehicle information, and further changed settings Since it is changed by the user interface, the order of the frequency spectrum of the exhaust sound and the sound pressure frequency spectrum corresponding to the target signal can be made, and the exhaust noise can be removed,
You can get the desired exhaust note.

[Brief description of drawings]

FIG. 1 is a diagram showing a noise control device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a tone color control section 8 in FIG.

3 is a diagram showing a configuration of a target signal forming unit 9 in FIG.

FIG. 4 is a diagram showing a frequency spectrum of timbre-controlled noise caused by timbre control according to the first embodiment.

FIG. 5 is a diagram showing a noise control device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the second embodiment.

FIG. 7 is a diagram showing a noise control device according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the third embodiment.

FIG. 9 is a diagram showing a noise control device according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the fourth embodiment.

FIG. 11 is a diagram showing a noise control device according to a fifth embodiment of the present invention.

FIG. 12 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the fifth embodiment.

FIG. 13 is a diagram showing a noise control device according to a sixth embodiment of the present invention.

FIG. 14 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the sixth embodiment.

FIG. 15 is a diagram showing a noise control device according to a seventh embodiment of the present invention.

FIG. 16 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the seventh embodiment.

FIG. 17 is a diagram showing a noise control device according to an eighth embodiment of the present invention.

FIG. 18 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the eighth embodiment.

FIG. 19 is a diagram showing a noise control device according to a ninth embodiment of the present invention.

FIG. 20 is a diagram showing a frequency spectrum of tone-color-controlled noise generated by tone color control according to the ninth embodiment.

FIG. 21 is a diagram showing a conventional noise control device that cancels noise.

22 is a diagram showing a configuration of the adaptive filter of FIG.

FIG. 23 is a diagram showing frequency components of noise before and after noise control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Muffler 3 ... Cancellation space 3-1 ... Tail pipe 4 ... Speaker 5 ... Microphone 6 ... Adaptive filter 7 ... Filter coefficient update part 8 ... Tone control part 9 ... Target signal formation part 10 ... Order setting part 11 ... Sound pressure setting unit 12 ... Rotation speed detection unit 13 ... Transfer characteristic simulation unit 14, 17 ... Addition unit 15 ... Other vehicle information unit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshiaki Kusano 1-2-2 Goshodori, Hyogo-ku, Kobe, Hyogo Prefecture Fujitsu Ten Limited

Claims (9)

[Claims] 1. A speaker (4) for outputting a tone color control sound for controlling a tone color of noise of a power source (1), and an error signal for detecting a tone color control noise in which the noise is controlled by the tone color control sound. In a noise control device having a microphone (5) formed in (1), a target signal having a frequency spectrum to be targeted is input, and a tone color control signal is input to perform tone color control such that the error signal matches the target signal. A tone color control section (8) including an adaptive filter for outputting to a speaker (4); target signal forming means (9) for forming the target signal and outputting the target signal to the tone color control section (8); An order setting unit (10) for setting the order of the frequency spectrum in the target signal forming means (9), and a sound for setting the sound pressure of the frequency spectrum of the target signal in the target signal forming means (9). Noise control apparatus characterized by comprising a setting unit (11). 2. A rotation speed detector (12) for detecting the rotation speed of the power source (1) is provided, and a target signal of the order setting section (10) is supplied to the target signal forming means (9). Frequency spectrum order setting and the sound pressure setting unit (1
The sound pressure setting of the frequency spectrum of the target signal of 1) is changed by using the rotation speed as a parameter.
The noise control device according to claim 1. 3. A rotation speed detector (12) for detecting the rotation speed of the power source (1), and a transfer characteristic simulating section simulating the acoustic transfer characteristics between the speaker (4) and the microphone (5). 13), and an adder (14) that forms a reproduced noise signal that reproduces the noise of the power source (1) by taking the difference between the tone color control signal that has passed through the transfer characteristic simulation unit (13) and the error signal. For the target signal forming means (9), the order setting of the frequency spectrum of the target signal of the order setting unit (10) is changed by using the rotational speed as a parameter, and the sound pressure setting unit (11) The noise control device according to claim 2, wherein the sound pressure setting of the frequency spectrum of the target signal is changed by using the reproduced noise signal level of the adding unit (14) as a parameter. 4. In place of the adding section (14) of the transfer characteristic section (13), the accelerator opening of the power source (1) is used as a parameter for the target signal forming means (9).
The noise control device according to claim 3, wherein the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit (11) is changed. 5. The target signal forming means (9) using, as a parameter, the engine load of the power source (1) instead of the addition section (14) of the transfer characteristic section (13).
The noise control device according to claim 3, wherein the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit (11) is changed. 6. The sound pressure setting unit for the target signal forming means (9) using the vehicle speed of the power source (1) as a parameter, instead of the adding unit (14) of the transfer characteristic unit (13). The noise control device according to claim 3, wherein the sound pressure setting of the frequency spectrum of the target signal of (11) is changed. 7. The sound pressure setting for the target signal forming means (9) using the drive range of the power source (1) as a parameter, instead of the adding section (14) of the transfer characteristic section (13). 4. The sound pressure setting of the frequency spectrum of the target signal of the section (11) is changed.
The noise control device described in. 8. The other vehicle information (15) having the timbre characteristic of the noise of another vehicle based on the rotation speed of the rotation speed detection unit (12) instead of the addition unit (14) of the transfer characteristic unit (13). And changing the order of the frequency spectrum of the order setting unit (10) and the sound pressure setting of the sound pressure setting unit (11) with respect to the target signal forming means (9).
The noise control device according to claim 3. 9. A rotation speed detector (12) for detecting the rotation speed of the power source (1), and a user interface (16) connected to the order setting unit (10) and the sound pressure setting unit (11). ) And the target signal forming means (9)
On the other hand, the order setting of the frequency spectrum of the target signal of the order setting unit (10) and the sound pressure setting of the frequency spectrum of the target signal of the sound pressure setting unit (11) are changed with the rotation speed as a parameter, The noise control device according to claim 2, characterized in that the further changed setting is changed by the user interface (15).