JP2008062804A - Active noise control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active noise control device for properly eliminating interior vibration noise by generating a reference signal in which the surface state or the like of a road is taken into consideration. <P>SOLUTION: This active noise control device 10 reads out the positional information of a vehicle, and reads out road information corresponding to the positional information from a road information memory means 28 to generate a road signal Sa, and outputs the signal to a reference signal generating means 14 to generate a reference signal Sr based on the road signal Sa. By this structure, interior noise can be eliminated, while taking into consideration the road surface state of the road. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an active noise control device that suppresses road noise, and more particularly to an active noise control device that is suitable for application to a closed space such as a room of a moving body.

  2. Description of the Related Art Conventionally, an active vibration noise control apparatus for vibration noise in a passenger compartment using an adaptive filter is known (Patent Document 1). In this active vibration and noise control device, the vibration noise in the vehicle interior is generated in synchronization with the rotation of the engine output shaft in the vehicle, and the vehicle interior vibration noise of the frequency based on the rotation of the engine output shaft is applied. The sound is muted using a filter.

  FIG. 10 is a diagram showing a schematic block diagram of a general active vibration noise control apparatus 100. In the active vibration noise control apparatus 100, the frequency detection means 13 detects the frequency f of the noise Nz from the engine pulse Ep, outputs it to the reference signal generation means 14, and the reference signal generation means 14 generates the reference signal Sr, Control sound is output from the speaker 18 through the adaptive filter 16 and through the D / A converter 40, the LPF 42 and the amplifier 44. Further, the reference signal generation unit 30 generates a reference signal based on the standard signal Sr output from the standard signal generation unit 14 and outputs the reference signal to the filter coefficient update unit 32. Further, the microphone 20 detects an error between the noise Nz and the control sound, and outputs the error signal e to the filter coefficient updating unit 32 via the amplifier 46, the BPF 48, and the A / D converter 50. Based on the error signal e and the reference signal, the filter coefficient updating unit 32 updates the filter coefficient of the adaptive filter 16 so that the error signal e is minimized.

  According to the active vibration noise control apparatus 100, noise generated in the engine is considerably reduced.

JP 2000-99037 A (FIG. 8)

  By the way, the noise generated in the vehicle is not limited to that generated from the engine, and includes, for example, road noise generated between the road surface and the tire that travels. In the active vibration noise control apparatus 100 described above, the reference signal Sr generated by the reference signal generation unit 14 is changed from the engine pulse Ep to the frequency f of the noise Nz without considering the road surface condition of the road on which the vehicle is traveling. Has been generated based on. Therefore, the active vibration noise control device 100 cannot effectively reduce road noise. Road noise can also be affected by road surface conditions, humidity outside the vehicle, etc., but these factors are not taken into consideration.

  The present invention has been made in consideration of the above-described problems, and an object thereof is to provide an active noise control device that generates a reference signal for appropriately suppressing road noise.

  An active noise control device according to the present invention includes position recognition means for determining the position of a vehicle, road information storage means in which road information including road position and road surface information is stored corresponding to a plurality of roads, Reference signal generation means for reading the road surface information from the road information corresponding to the vehicle position obtained by the position recognition means and generating a control sound reference signal that cancels road noise based on the road surface information And.

  According to the present invention, a reference signal is generated from road surface information corresponding to the position of the vehicle, so that the vehicle according to the road surface state in consideration of the road surface type, the road pavement state, the road type, etc. It is possible to appropriately suppress road noise transmitted to the room.

  The active noise control device further includes vehicle speed detection means, and the reference signal generation means generates the reference signal based on the vehicle speed detected by the vehicle speed detection means and the road surface information. It becomes possible to appropriately suppress road noise transmitted to the vehicle interior according to the road surface condition of the road in consideration of the speed of the vehicle, the type of the road surface, the pavement state of the road surface, the type of road, and the like.

  The active noise control device further includes humidity detection means for detecting outdoor humidity of the vehicle, and the reference signal generation means is configured to detect the reference signal based on the outdoor humidity and the road surface information obtained from the humidity detection means. It is possible to appropriately suppress road noise transmitted to the vehicle interior according to the road surface condition in consideration of the humidity outside the vehicle and the type of road surface, the pavement state of the road surface, the type of road, and the like.

  The humidity detecting means estimates the dry condition of the road surface from the detected outdoor humidity of the vehicle, and the reference signal generating means generates the reference signal based on the dry condition of the road surface and the road surface information. The road noise transmitted to the passenger compartment can be appropriately suppressed according to the road surface condition of the road in consideration of the dry state of the road surface and the type of road surface, the pavement state of the road surface, the type of road, and the like.

  In the active noise control apparatus, the road surface information includes road signal characteristics for canceling the road noise.

  The active noise control device further includes an adaptive filter that receives the reference signal and outputs a control signal, cancellation noise generation means that outputs the control signal as cancellation noise, and an error between the road noise and the cancellation noise. An error signal detecting means for detecting and outputting as an error signal, and a reference signal generating means having a signal transfer characteristic from the canceling noise generating means to the error signal detecting means and outputting a reference signal upon receiving the reference signal And filter coefficient updating means for updating a filter coefficient of the adaptive filter based on the error signal and the reference signal.

  An active noise control device according to the present invention includes a frequency detection unit that outputs a harmonic signal from a frequency of noise generated from a traveling drive source of a vehicle, a vehicle speed detection unit that detects a vehicle speed, and a position of the vehicle. Position recognition means to be obtained; road information storage means in which road information including road position and road surface information is stored corresponding to a plurality of roads; and the frequency of the noise and vehicle information obtained by the position recognition means Reference signal generation means for generating a reference signal for canceling the noise and road noise based on road surface information read from the road information of the road corresponding to the position and the vehicle speed detected by the vehicle speed detection means It is characterized by providing.

  According to the present invention, a road that takes into account vehicle speed and road surface type, road pavement state, road type, and the like by generating a reference signal based on noise frequency, vehicle speed, and road surface information. The vehicle interior noise can be appropriately suppressed according to the road surface condition.

  According to the present invention, road noise generated based on road surface conditions can be estimated by generating a reference signal from road surface information corresponding to the position of the vehicle. Therefore, it is possible to appropriately set a reference signal serving as a reference for control output for canceling the road noise.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram of an active noise control apparatus 10 according to the first embodiment of the present invention. FIG. 2 is a schematic diagram in which the active noise control device 10 shown in FIG. 1 is mounted on a vehicle 70 that is a moving body having an engine 72. The active noise control apparatus 10 according to this embodiment basically includes a vehicle speed detection means 12, a reference signal generation means 14, an adaptive filter 16, a speaker (cancellation noise generation means) 18, a microphone (error signal detection means) 20, The position recognition means 24, road signal output means 26, road information storage means 28, reference signal generation means 30, and filter coefficient update means 32 are configured. Among these, the vehicle speed detection means 12, the reference signal generation means 14, the adaptive filter 16, the position recognition means 24, the road signal output means 26, the road information storage means 28, the reference signal generation means 30 and the filter coefficient update means 32 are micro The computer 80 is configured. In addition, the same code | symbol is attached | subjected to the component same as the active vibration noise control apparatus 100 shown in FIG.

  The vehicle speed detection means 12 detects the speed of the vehicle and outputs it as a speed signal Sv to the reference signal generation means 14.

  The reference signal generating means 14 generates a reference signal Sr that serves as a control output reference for canceling the road noise Rn based on road signal characteristics included in the road signal Sa described later, and the adaptive filter 16 and the reference signal generating means. Output to 30. Here, in this specification, the road noise Rn is generated when a vehicle running on a road is caused by vibrations of tires matched to the unevenness of the road surface being transmitted to the body through the suspension and vibrating the air in the vehicle. This means noise and noise that is directly propagated from the road surface.

  The adaptive filter 16 generates a control signal for canceling the road noise Rn from the reference signal Sr. A control signal, which is a digital signal, is supplied to the speaker 18 via a D / A converter 40, an LPF (low-pass filter) 42, and an amplifier 44, and is output as a control sound via the speaker 18. As the adaptive filter 16, an adaptive notch filter or an FIR filter can be used. The speaker 18 can also be used as an audio speaker using a predetermined mixer.

  The microphone 20 is a sound detector that detects an offset error sound between the road noise Rn and the control sound from the speaker 18 and outputs it as an error signal e.

  The position recognizing means 24 receives a GPS signal transmitted from a GPS (Global Positioning System) satellite by an antenna (not shown), obtains a position coordinate of the vehicle, and outputs it to the road signal output means 26 as position information. As the position recognition means 24, a so-called navigation system can also be used.

  Based on the vehicle position information obtained by the position recognition means 24, the road signal output means 26 reads road information, which will be described later, recorded in the road information storage means 28. The road information output means 26 reads the road information. Based on this, the road signal Sa is output to the reference signal generating means 14.

  The reference signal generation unit 30 generates a reference signal from the reference signal Sr based on the signal transfer characteristics between the speaker 18 and the microphone 20 and outputs the reference signal to the filter coefficient update unit 32.

  The filter coefficient updating unit 32 updates the filter coefficient of the adaptive filter 16 so that the reference signal and the error signal e are minimized.

  As shown in FIG. 2, the active noise control device 10 is actually arranged and fixed below the dashboard, and is fixed to the vehicle speed Sv detected by the vehicle speed detection means 12 and the roof flying on the driver's seat. The error signal e from the microphone 20 is input, and the control sound is output from the speaker 18 disposed under the driver's seat. In this embodiment, the noise control only for the driver's seat will be described in order to facilitate understanding, but the present invention can be similarly applied to other seats such as a passenger seat and a rear seat.

  Next, generation of the reference signal Sr based on the road signal Sa will be described.

  The position recognizing means 24 obtains the position coordinates of the traveling vehicle and outputs the position coordinates to the road signal output means 26 as position information. The road signal output means 26 reads road information corresponding to the position information from the road information storage means 28. Here, the road information storage means 28 includes a road surface type table 28a as shown in FIG. 3 and a road signal characteristic table 28b as shown in FIG.

  The road surface type table 28a represents road surface types corresponding to link data representing road sections using latitude and longitude. The type of road surface can be divided for each material used for road paving, for example, asphalt, brick, concrete and the like. Moreover, it can also divide | segment according to the pavement state of a road, for example, uneven | corrugated state etc. Furthermore, it can also classify | categorize for every kind of road, for example, 1st-class national highway, 2nd-class national highway, highway, etc. In the road surface type table 28a, link data, L1 [(x1, y1) to (x2, y2)], L2 [(x2, y2) to (x3, y3)], L3 [(x3, y3) to (x4, y4)], L4 [(x4, y4) to (x5, y5)] corresponding to road surface types R1 to R4. (X, y) means latitude x and longitude y.

  The road signal characteristic table 28b shows road signal characteristics f for canceling the road noise Rn with respect to the road surface types R1 to R4 specified in the road surface type table 28a. In FIG. 3 and FIG. 4, R1 (fine asphalt), R2 (brick), R3 (concrete), and R4 (coarse asphalt) are used for easy understanding. Needless to say, it is not limited to cases.

  In the road information storage means 28, when the current position of the vehicle is, for example, the position of latitude x1 and longitude x1, the vehicle is traveling on the road corresponding to the link data L1, so the road surface type table 28a indicates the road surface. The type is read as R1. Next, in the road signal characteristic table 28b, the road signal characteristic f is specified as f1 from the road surface type R1. The road signal output means 26 outputs this road signal characteristic f to the reference signal generation means 14 as a road signal Sa. The reference signal generator 14 generates a reference signal Sr based on the road signal Sa and outputs the reference signal Sr to the adaptive filter 16. The adaptive filter 16 generates a control signal for canceling the road noise Rn from the reference signal Sr, and this control signal is output from the speaker 18 as a control sound.

  The reference signal generator 14 corrects the frequency characteristics and amplitude characteristics of the road signal Sa based on the vehicle speed obtained from the speed signal Sv, and generates the reference signal Sr based on the corrected road signal Sa. May be.

  Here, the road signal characteristic f is based on a signal characteristic highly correlated with the type of road surface or an amplitude characteristic (spectrum characteristic) in a frequency band for each type of road surface. The road signal characteristic f can be determined by actually running a vehicle for each type of road surface, and can be determined by simulation or the like.

  In the active noise control apparatus 10, the road signal characteristic table 28 b is provided in the road information storage unit 28, but may be provided in a portion other than the road information storage unit 28. For example, when the road signal characteristic table 28 b is provided in the reference signal generation unit 14, the road signal output unit 26 outputs a road signal Sa indicating the type of road surface to the reference signal generation unit 14. The reference signal generation unit 14 reads the road signal characteristic f corresponding to the type of road surface from the road signal characteristic table 28 b, generates the reference signal Sr based on the road signal characteristic f, and outputs it to the adaptive filter 16.

  Further, the road information storage means 28 includes a road surface type table 28a and a road signal characteristic table 28b separately. As shown in FIG. 5, the road signal characteristic is a combination of the road surface type table 28a and the road signal characteristic table 28b. It is also possible to use the table 28c. In this case, the road signal characteristic f can be read directly from the road signal characteristic table 28c in correspondence with the latitude and longitude of the current position of the vehicle. For example, when the position of the vehicle is latitude x1 and longitude y1, the road signal characteristic f is f1 because the vehicle is traveling on the road corresponding to the link data L1. As described above, in the active noise control apparatus 10 according to the first embodiment, the position recognition means 24 for determining the position of the vehicle and the road including the road position and road surface information corresponding to a plurality of roads. The road surface information is read from the road information of the road corresponding to the vehicle position obtained by the road information storage means 28 and the position recognition means 24 in which the information is stored, and the road noise Rn is canceled based on the road surface information. And a reference signal generation means 14 for generating a reference signal Sr of the control sound to be generated.

  According to the active noise control device 10, the reference signal Sr for appropriately suppressing road noise in the passenger compartment is generated according to the road surface condition in consideration of the road surface type, the road surface paving state, the road type, and the like. It becomes possible. That is, it is possible to estimate road noise generated based on the type of road surface and appropriately set a reference signal as a control output reference for canceling the road noise. Further, the active noise control device 10 further includes a vehicle speed detection unit 12, and generates a reference signal Sr based on the vehicle speed signal Sv and the road signal Sa detected by the vehicle speed detection unit 12. It is possible to appropriately suppress road noise in the passenger compartment according to the road surface condition in consideration of the speed, the road surface type, the road pavement state, the road type, and the like. That is, in general, as the vehicle speed increases, the road noise frequency also increases. Therefore, in addition to the road surface type and the like, the control output reference for canceling the road noise in accordance with the vehicle speed is provided. It is possible to appropriately set the reference signal. In addition, it is possible to appropriately suppress road noise in the vehicle interior by simply obtaining useful information from a navigation system that has not been interconnected in the past.

  Further, if there is no noise reduction effect from the error signal using the reference signal based on the road signal characteristics, for example, it is determined that the road surface condition has changed due to road construction or the like, and the road signal Sa is output. May be stopped. Further, when the vehicle is traveling on a road that is not described in the road surface type table 28a, the road signal Sa may not be output. Furthermore, the output of the road signal Sa may be controlled according to the type of road. Furthermore, the road signal Sa can be output from the road signal output means 26 by giving priority to the main road that is assumed to have a high vehicle driving frequency. Furthermore, by deleting road information about roads with relatively low vehicle running frequency from the road information storage means 28, it is possible to reduce the storage capacity of the road information storage means 28 and the trouble of measuring the road information. Is possible.

  Further, the active noise control device 10 can be configured not to output the reference signal Sr from the reference signal generation means 14 when the vehicle speed is zero, that is, when the vehicle is stopped.

  FIG. 6 is a block diagram of an active noise control apparatus 10A according to the second embodiment of the present invention. In the active noise control device 10 </ b> A, humidity detection means 62 is added to the active noise control device 10.

  The humidity detector 62 detects the humidity outside the vehicle and the humidity of the road surface on which the vehicle is traveling, and outputs the detected humidity to the road signal output unit 26. In the active noise control device 10A, the dry condition of the road surface is taken into account, for example, when it is raining, the water splash generated from the tire is included as a noise component in the passenger compartment. This is because an appropriate reference signal Sr is generated in consideration of sound. Also, even when it is not raining, the friction coefficient of the road surface changes depending on the degree of dryness, and the sound itself generated from the road surface changes.

  The outdoor humidity of the vehicle can be detected by a hygrometer (not shown) provided outside the vehicle.

  As shown in FIG. 7, the active noise control apparatus 10A takes into account the humidity outside the vehicle and the dry condition of the road surface for the same road surface type with respect to the road signal characteristic table 28b shown in FIG. The road signal characteristic correction table 28d is provided in the road information storage means 28.

  The road signal characteristic correction table 28d shown in FIG. 7 shows the road signal characteristic correction value α when the outdoor humidity of the vehicle is h1, and FIGS. 8A and 8B show the road signal characteristic based on the road signal characteristic correction table 28d. The road signal characteristics before and after correction are shown.

  The road signal characteristic correction table 28d represents a correction value α for correcting the road signal characteristic f in consideration of outdoor humidity with respect to the road signal characteristic f for the road surface type shown in the road signal characteristic table 28b. When the road signal characteristic f is corrected with the correction value α, FIG. 8A showing the relationship between the frequency fr and the gain in the road signal characteristic f shows the relationship between the frequency fr and the gain in the corrected road signal characteristic f. It changes as shown in FIG. 8B. 8A and 8B are schematic diagrams for easy understanding, but needless to say, the correction of the road signal characteristic f by the correction value α is not limited to these cases.

  In the active noise control device 10 </ b> A, the humidity detection means 62 estimates the dry state of the road surface of the road on which the vehicle is traveling from the humidity outside the vehicle and outputs it to the road signal output means 26. The road signal output means 26 reads road information corresponding to the current position of the vehicle obtained by the position recognition means 24 from the road surface type table 28a. Here, when the current position of the vehicle is, for example, a position of latitude x1 and longitude y1, since the vehicle is traveling on the road corresponding to the link data L1, the road surface type is set to R1 from the road surface type table 28a. When the outdoor humidity of the vehicle is h1, the road signal characteristic f1 is corrected by the correction value α1.

  The road signal output means 26 reads the road signal characteristic f from the road surface type table 28a, the road signal characteristic table 28b, and the road signal characteristic correction table 28d on the basis of the read road type and dry state, and serves as a reference signal as the road signal Sa. Output to the generation means 14. The reference signal generator 14 generates a reference signal Sr based on the road signal Sa and outputs the reference signal Sr to the adaptive filter 16. The adaptive filter 16 generates a control signal for canceling the road noise Rn from the reference signal Sr, and this control signal is output from the speaker 18 as a control sound.

  As described above, in the active noise control device 10A according to the second embodiment, the road signal Sa is generated based on the outdoor humidity of the vehicle detected by the humidity detection means 62 and the road information, and the reference signal generation means. The vehicle interior considering the road surface condition considering the vehicle speed, road type, road pavement condition, road type, etc., and the humidity outside the vehicle and / or the dry condition of the road surface. It is possible to properly mute road noise.

  FIG. 9 is a diagram showing a configuration of an active noise control apparatus 10B according to the third embodiment of the present invention. In the active noise control device 10B, a frequency detection means 13 is added to the active noise control device 10 described above.

  The frequency detection means 13 detects a frequency f of noise generated from an engine pulse Ep obtained from a rotation sensor that detects the rotation of the main shaft of the engine (traveling drive source) 72, and generates a reference signal as a harmonic signal Sh for harmonics. Output to means 14. The microphone 20 </ b> A is a sound detector that detects an offset error sound between the combined noise of the noise generated from the engine 72 and the road noise and the control sound from the speaker 18, and outputs it as an error signal e.

  In the active noise control device 10B, the road signal output means 26 reads road information corresponding to the current position of the vehicle obtained by the position recognition means 24 from the road surface type table 28a.

  In the road information storage means 28, when the current position of the vehicle is, for example, the position of latitude x1 and longitude y1, the vehicle is traveling on the road corresponding to the link data L1, so that the road surface from the road surface type table 28a. Is identified as R1 (see FIG. 3). Next, the road signal characteristic f is identified as f1 from the type of road surface identified in the road signal characteristic table 28b (see FIG. 4). The road signal output unit 26 reads the road signal characteristic f from the road surface type table 28a and the road signal characteristic table 28b based on the current position of the vehicle, and outputs the road signal characteristic f to the reference signal generation unit 14 as a road signal Sa.

  The vehicle speed detection means 12 detects the speed of the vehicle and outputs it as a speed signal Sv to the reference signal generation means 14. The reference signal generation unit 14 generates a reference signal Sr based on the harmonic signal Sh, the speed signal Sv, and the road signal Sa, and outputs the reference signal Sr to the adaptive filter 16. The adaptive filter 16 generates a control signal for canceling the noise Nz from the reference signal Sr, and this control signal is output from the speaker 18 as a control sound.

  As described above, in the active noise control device 10B according to the third embodiment, the frequency detection means 13 that outputs the harmonic signal from the frequency of the noise Nz generated from the driving drive source of the vehicle, detects the speed of the vehicle. Vehicle speed detection means 12, position recognition means 24 for determining the position of the vehicle, road information storage means 28 in which road information including road position and road surface information corresponding to a plurality of roads is stored. The noise Nz and the road based on the frequency of the noise Nz, the road surface information read from the road information corresponding to the vehicle position obtained by the position recognition means 24 and the vehicle speed detected by the vehicle speed detection means 12. And a reference signal generation means for generating a reference signal of a control sound for canceling out the noise Rn. According to the active noise control device 10B, by generating the reference signal Sr based on the harmonic signal Sh, the vehicle speed signal Sv, and the road signal Sa, the vehicle speed and the road surface type, the road pavement state, the road It is possible to appropriately mute the vehicle interior noise according to the road surface condition in consideration of the type of the vehicle.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

1 is a block diagram of an active noise control device according to a first embodiment. It is a figure showing the state where the active noise control device concerning a 1st embodiment was installed in vehicles. It is a figure which shows the road surface kind table in the active noise control apparatus which concerns on 1st Embodiment. It is a figure which shows the road signal characteristic table in the active noise control apparatus which concerns on 1st Embodiment. It is a figure which shows the road signal characteristic table for every road in the active noise control apparatus which concerns on 1st Embodiment. It is a block diagram of the active noise control apparatus which concerns on 2nd Embodiment. It is a figure which shows the road signal characteristic correction table corresponding to the predetermined humidity in the active noise control apparatus which concerns on 2nd Embodiment. 8A and 8B are diagrams showing road signal characteristics before and after correction based on the road signal characteristic correction table shown in FIG. It is a block diagram of the active noise control apparatus which concerns on 3rd Embodiment. It is a block diagram of the conventional active vibration noise control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Active noise control device 12 ... Vehicle speed detection means 13 ... Frequency detection means 14 ... Reference signal generation means 16 ... Adaptive filter 18 ... Speaker (cancellation noise generation means)
20, 20A ... Microphone (error signal detection means)
24 ... Position recognition means 26 ... Road signal output means 28 ... Road information storage means 28a ... Road surface type tables 28b, 28c ... Road signal characteristic table 28d ... Road signal characteristic correction table 30 ... Reference signal generation means 32 ... Filter coefficient update means 40 ... Converter 42 ... LPF
44, 46 ... Amplifier 62 ... Humidity detection means 70 ... Vehicle 72 ... Engine 80 ... Microcomputer 100 ... Active vibration noise control device

Claims (7)

Position recognition means for determining the position of the vehicle;
Corresponding to a plurality of roads, road information storage means for storing road information including information on the position and road surface of the road,
Reference signal generation means for reading the road surface information from the road information corresponding to the vehicle position obtained by the position recognition means and generating a control sound reference signal that cancels road noise based on the road surface information When,
An active noise control device comprising: The active noise control device according to claim 1,
Furthermore, it has a vehicle speed detection means,
The active noise control device, wherein the reference signal generating means generates the reference signal based on the vehicle speed detected by the vehicle speed detecting means and the information on the road surface. The active noise control device according to claim 1 or 2,
Furthermore, it has humidity detection means for detecting the humidity outside the vehicle,
The active noise control device, wherein the reference signal generating unit generates the reference signal based on outdoor humidity obtained from the humidity detecting unit and information on the road surface. The active noise control device according to claim 3,
The humidity detection means estimates the dry state of the road surface from the detected outdoor humidity of the vehicle,
The active noise control device, wherein the reference signal generation unit generates the reference signal based on the dry state of the road surface and information on the road surface. In the active noise control device according to any one of claims 1 to 4,
The road noise information includes a road signal characteristic for canceling the road noise. In the active noise control device according to any one of claims 1 to 5,
An adaptive filter that receives the reference signal and outputs a control signal;
Canceling noise generating means for outputting the control signal as canceling noise;
An error signal detecting means for detecting an error between the road noise and the canceling noise and outputting an error signal;
A reference signal generating means having a signal transfer characteristic from the canceling noise generating means to the error signal detecting means, wherein the reference signal is input and a reference signal is output;
Filter coefficient updating means for updating a filter coefficient of the adaptive filter based on the error signal and the reference signal;
An active noise control device comprising: A frequency detection means for outputting a harmonic signal from the frequency of noise generated from a traveling drive source of the vehicle;
Vehicle speed detecting means for detecting the speed of the vehicle;
Position recognition means for determining the position of the vehicle;
Corresponding to a plurality of roads, road information storage means for storing road information including information on the position and road surface of the road,
The noise and road noise based on the harmonic signal, road surface information read from the road information corresponding to the vehicle position obtained by the position recognition means, and the vehicle speed detected by the vehicle speed detection means. A reference signal generating means for generating a reference signal of the control sound for canceling
An active noise control device comprising:

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