WO2014061084A1 - 車両接近通報装置の音質調整装置、車両接近通報装置シミュレータ、および車両接近通報装置 - Google Patents
車両接近通報装置の音質調整装置、車両接近通報装置シミュレータ、および車両接近通報装置 Download PDFInfo
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- WO2014061084A1 WO2014061084A1 PCT/JP2012/076626 JP2012076626W WO2014061084A1 WO 2014061084 A1 WO2014061084 A1 WO 2014061084A1 JP 2012076626 W JP2012076626 W JP 2012076626W WO 2014061084 A1 WO2014061084 A1 WO 2014061084A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q5/00—Arrangement or adaptation of acoustic signal devices
- B60Q5/005—Arrangement or adaptation of acoustic signal devices automatically actuated
- B60Q5/008—Arrangement or adaptation of acoustic signal devices automatically actuated for signaling silent vehicles, e.g. for warning that a hybrid or electric vehicle is approaching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to a sound quality adjustment of a vehicle approach notification sound device that generates a notification sound for notifying a pedestrian or the like by sound in a highly quiet electric vehicle such as a hybrid vehicle or an electric vehicle.
- Gasoline vehicles, diesel vehicles, motorcycles, etc. that use conventional internal combustion engines as power sources (hereinafter referred to as ⁇ conventional vehicles, etc. '') emit engine sounds and exhaust sounds emitted by the power sources themselves, as well as roads that are running. Since noise or the like is generated, a pedestrian walking in the city or a person riding a bicycle can recognize the approach of the vehicle by the engine sound or exhaust sound of the automobile.
- the driving mode is driven mainly by the electric motor, not by the engine, so no engine noise or exhaust noise is generated, and in the case of electric vehicles, fuel cell vehicles, etc. Since the vehicle is driven by an electric motor in the entire operation region, all automobiles are very quiet electric vehicles.
- the sound quality is controlled so that a natural notification sound can be obtained by changing the phoneme signal to the phoneme used as a sound source by using a filter according to vehicle information such as the accelerator opening and the vehicle speed. is doing.
- phonemes are mainly prepared by car manufacturers, and they are often different for each model. For this reason, adjustment of a filter etc. is needed for each of various phonemes. Also, even if the driver wants to adjust the default setting of the car maker when the default setting is not the preferred one, there is no device for easily adjusting the sound quality.
- the present invention solves the above-described problems, and provides a sound quality adjustment device that can easily adjust the sound quality even when the sound quality of phonemes is different. It is another object of the present invention to provide a vehicle approach notification device that allows a driver to easily adjust a default sound quality to a desired sound quality.
- the present invention relates to a sound quality of a vehicle approach notification device that generates a signal of a notification sound for radiating to the outside of an electric moving body from a sounding body provided in the electric moving body that generates at least a part of driving force by an electric motor.
- a phoneme storage unit that stores phoneme data that is a source of notification sound
- a sound source sound quality extraction unit that analyzes the phoneme data and extracts feature values related to the sound quality of the phoneme
- the sound source sound quality extraction unit extracts A parameter setting unit for obtaining a parameter for converting phoneme data corresponding to the vehicle information of the electric vehicle using the feature value of the phoneme, and a parameter storage unit for storing the parameter obtained by the parameter setting unit. It is a thing.
- the present invention it is possible to provide a sound quality adjustment device that can easily adjust sound quality even when the sound quality of phonemes is different.
- FIG. 1 is a block diagram showing a configuration of a sound quality adjustment device of a vehicle approach notification device according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart which shows the flow which calculates the pitch parameter of the sound quality adjustment apparatus of the vehicle approach notification apparatus by Embodiment 1 of this invention.
- the vehicle approach notification device is a device for emitting a notification sound to the outside of an electric vehicle that generates at least a part of driving force by an electric motor, such as a hybrid vehicle or an electric vehicle.
- the FFT unit 11 of the sound source sound quality extraction unit 1 reads out the corresponding phoneme stored in the phoneme storage unit 82 of the storage device 8 (ST11), and performs FFT (Fast Fourier Transform) processing (ST12).
- the phoneme is a loop sound in which, for example, digital data of sound by PCM (Pulse-code Modulation) is stored for a predetermined time as sound data that is a source of notification sound generated by the vehicle approach notification device.
- the predetermined time is a short time that can be recognized as a sound, for example, 1 second.
- the phonemes are not limited to those recalling conventional engine sounds, but may be anything such as sine waves, white noise, and melody sounds.
- the frequency peak extraction unit 12 of the sound source sound quality extraction unit 1 extracts the maximum peak frequency, that is, the maximum peak frequency (fp) from the frequency distribution waveform of the phoneme subjected to the FFT processing by the FFT unit 11 (ST13).
- FIG. 3 shows an example of a frequency distribution waveform of phonemes subjected to FFT processing by the FFT unit 11.
- the pitch parameter calculation unit 2 of the parameter setting unit 10 calculates the maximum pitch value Pitch_max and the minimum pitch value Pitch_min using the maximum peak frequency fp extracted by the frequency peak extraction unit 12 (ST14).
- the maximum pitch value Pitch_max and the minimum pitch value Pitch_min using the maximum peak frequency fp for example, the following equations can be used.
- Pitch_max fpmax / fp
- Pitch_min fpmin / fp
- fpmax is the maximum frequency at which the maximum peak frequency fp may change when the phoneme data is converted using the pitch maximum value Pitch_max
- fpmin is the phoneme data converted using the pitch minimum value Pitch_max
- the maximum peak frequency fp is a minimum frequency that may change.
- fpmax and fpmin are constants given in advance.
- fpmax may be 4 kHz because elderly people are said to be difficult to hear above 4 kHz, or may be half the sampling frequency according to the system of the vehicle approach notification device.
- fpmin may be adjusted to the reproduction frequency band of the sound generator in accordance with the system of the vehicle approach notification device.
- the pitch parameter interpolation processing unit 3 of the parameter setting unit 10 is between the pitch maximum value Pitch_max and the pitch minimum value Pitch_min calculated by the pitch parameter calculation unit 2 so that the pitch parameter changes according to vehicle information such as the vehicle speed. Is interpolated (ST15).
- FIG. 4 shows an example of interpolation processing when the vehicle information is vehicle speed.
- linear interpolation that changes in proportion to vehicle information such as vehicle speed may be used, or logarithmic interpolation that saturates in accordance with changes in vehicle information. It is also possible to use exponential interpolation that changes rapidly according to changes in vehicle information.
- the interpolation process may not be the same interpolation method as a whole, but may be different interpolation methods before and after the displacement point.
- FIG. 5 shows an interpolation process when there is a transition point. As shown in FIG. 5, linear interpolation may be used from the minimum value to the transition point, and logarithmic interpolation may be performed from the transition point to the maximum value, and a plurality of transition points may be provided.
- the pitch parameter update unit 4 of the parameter setting unit 10 generates a parameter table in a format corresponding to the system of the corresponding vehicle approach notification device for the pitch parameter interpolated by the pitch parameter interpolation processing unit 3, and the storage device 8 is stored by replacing the parameter table stored in the parameter storage unit 81 with the generated parameter table (ST16).
- FIG. 6 shows an example of the format for the pitch parameter of the parameter table stored in the parameter storage unit 81.
- the parameter information may be stored in the parameter storage unit 81 in a tabular format in which vehicle information values and pitch parameter values are paired.
- FIG. 7 is a flowchart showing a flow of calculating the volume parameter of the sound quality adjusting device of the vehicle approach notification device according to Embodiment 1 of the present invention.
- the volume peak extraction unit 13 of the sound source sound quality extraction unit 1 reads out the corresponding phoneme stored in the phoneme storage unit 82 of the storage device 8 (ST21), and extracts the maximum volume peak Lp of the sample data (ST22).
- the volume peak Lp extracted by the volume peak extraction unit 13 may be an average volume peak at which the average volume obtained by taking the average value of a certain section of the sample data becomes a peak.
- the volume parameter calculation unit 5 of the parameter setting unit 10 uses the volume peak Lp (maximum volume peak or average volume peak) extracted by the volume peak extraction unit 13 of the sound source sound quality extraction unit 1 and the volume maximum value Level_max and the volume.
- the minimum value Level_min is calculated (ST23).
- Level_max Lpmax / Lp
- Level_min Lpmin / Lp
- Lpmax represents the maximum volume when the phoneme data is converted using the maximum volume level Level_max
- Lpmin represents the minimum volume when the phoneme data is converted using the minimum volume level Level_min. Both Lpmax and Lpmin are given in advance. Constant. For example, Lpmax may be set so as not to exceed the noise level of a gazolin engine vehicle, and Lpmin may be set so that it can be heard in a downtown area.
- the volume parameter interpolation processing unit 6 of the parameter setting unit 10 performs an interpolation process between the maximum volume level Level_max and the minimum volume level Level_min calculated by the volume parameter calculation unit 5 so as to change according to vehicle information such as the vehicle speed.
- FIG. 8 shows an example of interpolation processing. As shown in FIG. 8, between the maximum volume level Level_max and the minimum volume level Level_min, linear interpolation that changes in proportion to vehicle information may be used, or logarithmic interpolation that saturates according to changes in vehicle information. However, exponential interpolation may be used that changes rapidly according to changes in vehicle information.
- the interpolation process may have a transition point from the minimum value to the maximum value.
- FIG. 9 shows an interpolation method when a transition point is provided. As shown in FIG. 9, linear interpolation may be used from the minimum value to the transition point, and logarithmic interpolation may be performed from the transition point to the maximum value, and a plurality of transition points may be provided.
- the volume parameter updating unit 7 of the parameter setting unit 10 generates a parameter table in a format corresponding to the system of the corresponding vehicle approach notification device for the volume parameter interpolated by the volume parameter interpolation processing unit 6, and the storage device
- the parameter table stored in the parameter storage unit 81 is replaced with the generated parameter table and stored (ST25).
- FIG. 10 shows an example of the format for the volume parameter of the parameter table stored in the parameter storage unit 81.
- the parameter information may be stored in the parameter storage unit 81 in a tabular format in which the value of the vehicle information and the value of the volume parameter are paired.
- FIG. 11 is a block diagram illustrating an example of a configuration of the vehicle approach notification device simulator.
- the vehicle approach notification device simulator 30 includes the sound quality adjustment device 100 shown in FIG. 1, a notification sound signal generation unit 200 having a pitch conversion unit 21 and a volume conversion unit 22, and a simulated vehicle information generation unit 20.
- the simulated vehicle information generation unit 20 stores simulated vehicle information that simulates vehicle information such as the vehicle speed when the electric vehicle actually travels, and generates and outputs simulated vehicle information as necessary.
- the vehicle approach notification device simulator 30 uses the pitch parameter and the volume parameter stored in the parameter storage unit 81 in the sound quality adjustment device 100 to convert the phoneme stored in the phoneme storage unit 82 into the pitch conversion unit 21 and the volume conversion unit 22.
- the notification sound signal is generated by conversion, and the notification sound is generated from the sounding body 23 such as a speaker to confirm the sound quality of the notification sound.
- the pitch conversion unit 21 receives the pitch parameter transmitted from the parameter storage unit 81 corresponding to the vehicle information output from the simulated vehicle information generation unit 20, converts the phoneme sound signal, and outputs it.
- the pitch parameter table of FIG. 6 when the vehicle speed of 5 km / h is output from the simulated vehicle information generation unit 20, 1 is output as the pitch parameter from the parameter storage unit 81.
- the pitch conversion unit 21 When the pitch parameter is 1.0, the pitch conversion unit 21 outputs the phoneme data as it is without changing the pitch of the phoneme signal, that is, the pitch of the sound. For example, if the original phoneme is data for 1 second, it is output as data of sound that repeats the data for 1 second as data for 1 second.
- 1.2 is output as the pitch parameter from the parameter storage unit 81.
- the pitch conversion unit 21 in order to increase the pitch by 1.2, if the phoneme data is thinned to 1 / 1.2, that is, if the original phoneme is data for 1 second, it is 1 / 1.2 seconds. This data is output as sound data that repeats the data for 1 / 1.2 seconds.
- a signal of a notification sound in which the peak frequency changes from fpmin to fpmax is output from the pitch conversion unit 21 in accordance with changes in the vehicle information.
- the volume conversion unit 22 receives volume parameters corresponding to the vehicle information output from the simulated vehicle information generation unit 20 and transmitted from the parameter storage unit 81, and the sound data output from the pitch conversion unit 21.
- the volume i.e., amplitude
- the sound volume signal is output from the sound volume conversion unit 22 in accordance with changes in the vehicle information, with the sound volume peak changing from Lpmin to Lpmax.
- the sound conversion unit 23 generates the notification sound from the sound data output by converting the phoneme data in the pitch conversion unit 21 and the volume conversion unit 22 and confirms the sound quality of the notification sound.
- the sound source sound quality extraction unit 1 does not include the volume peak extraction unit 13
- the parameter setting unit 10 does not include the volume parameter calculation unit 5, the volume parameter interpolation processing unit 6, and the volume parameter update unit 7.
- vehicle information may be not only a vehicle speed but an electric motor rotation speed, an accelerator opening degree, etc. The same applies to the following embodiments in which only one of pitch and volume may be converted, and the vehicle information may be other than the vehicle speed.
- the sound source sound quality extraction unit 1 analyzes the phoneme data stored in the phoneme storage unit 82, extracts feature values related to the sound quality of phonemes such as frequency peaks and volume peaks, and sets parameters.
- the unit 10 obtains a parameter for converting phoneme data based on the vehicle information of the electric vehicle using the feature value related to the sound quality of the phoneme extracted by the sound source sound quality extraction unit 1.
- FIG. FIG. 12 is a flowchart showing a pitch parameter calculation flow in the sound quality adjustment device of the vehicle approach notification device according to Embodiment 2 of the present invention.
- the configuration of the apparatus is the same as in FIG.
- the FFT unit 11 of the sound source sound quality extraction unit 1 reads out the corresponding phoneme stored in the phoneme storage unit 82 of the storage device 8 (ST31), and performs an FFT process (ST32).
- FIG. 13 shows another example of the frequency distribution waveform of the phoneme subjected to FFT processing in the FFT unit 11, different from FIG. 3.
- the frequency peak extraction unit 12 of the sound source sound quality extraction unit 1 extracts the maximum peak frequency fp having the maximum peak from the frequency distribution waveform of the phoneme subjected to the FFT processing by the FFT unit 11 (ST33). Next, a peak whose difference with respect to the maximum peak is equal to or less than the reference value A (dB) is extracted (ST34), and the frequency of the peak existing on the lowest frequency side among the plurality of peaks including the maximum peak is determined as the low frequency side peak frequency fpL, the peak frequency present on the highest frequency side is extracted as the high frequency side peak frequency fpH (ST35).
- the pitch parameter calculation unit 2 calculates the maximum pitch value Pitch_max and the minimum pitch value Pitch_min from the peak frequencies fpL and fpH extracted by the frequency peak extraction unit 12 of the sound source sound quality extraction unit 1 (ST36). For example, the following equations can be used to calculate the maximum pitch value Pitch_max and the minimum pitch value Pitch_min from the peak frequencies fpL and fpH.
- Pitch_max fpmax / fpH
- Pitch_min fpmin / fpL
- fpmax is the highest frequency at which the high frequency side peak frequency fpH may change when the phoneme data is converted using the pitch maximum value Pitch_max
- fpmin is the phoneme data converted using the pitch minimum value Pitch_max.
- the low frequency side peak frequency fpL is the lowest frequency that may be shifted.
- fpmax and fpmin are constants given in advance. For example, since it is said that it is difficult for elderly people to hear above 4 kHz, fpmax may be 4 kHz, or may be half the sampling frequency according to the system of the vehicle approach notification device. Further, fpmin may be adjusted to the reproduction frequency band of the sound generator in accordance with the system of the vehicle approach notification device.
- the pitch parameter interpolation processing unit 3 performs an interpolation process between the maximum pitch value Pitch_max and the minimum pitch value Pitch_min calculated by the pitch parameter calculation unit 2 so as to change according to vehicle information such as the vehicle speed.
- the interpolation processing there are linear interpolation, logarithmic interpolation, exponential interpolation, etc. described in FIG. 4 of the first embodiment, and interpolation processing having a transition point as described in FIG. 5 may be used.
- the pitch parameter update unit 4 generates a parameter table of a format corresponding to the system of the corresponding vehicle approach notification device for the pitch parameter interpolated by the pitch parameter interpolation processing unit 3, and the parameter storage unit of the storage device 8
- the parameter table stored in 81 is replaced with the generated parameter table and stored.
- FIG. FIG. 14 is a block diagram showing the configuration of the sound quality adjustment device of the vehicle approach notification device according to Embodiment 3 of the present invention.
- FIG. 15 is a flowchart showing a flow of calculating pitch parameters in the sound quality adjusting device of the vehicle approach notification device according to Embodiment 3 of the present invention.
- the FFT unit 11 of the sound source sound quality extraction unit 1 reads out the corresponding phoneme stored in the phoneme storage unit 82 of the storage device 8 (ST31), and performs an FFT process (ST32).
- the frequency peak extraction unit 12 of the sound source sound quality extraction unit 1 extracts the maximum peak frequency fp having the maximum peak from the frequency distribution waveform of the phoneme subjected to the FFT processing by the FFT unit 11 (ST33).
- the above processing is the same as in the second embodiment.
- a peak whose difference with respect to the maximum peak is equal to or less than the reference value A (dB) is extracted (ST34), and the frequency of the peak existing on the lowest frequency side among the plurality of peaks including the maximum peak is determined as the low frequency side peak.
- the frequency fpL and the peak frequency existing on the highest frequency side are set as the high frequency side peak frequency fpH (ST35).
- the pitch parameter calculation unit 2 calculates the maximum pitch value Pitch_max and the minimum pitch value Pitch_min from the peak frequencies fpL and fpH extracted by the frequency peak extraction unit 12 of the sound source sound quality extraction unit 1 (ST36).
- Pitch_max fpmax / fpH
- Pitch_min fpmin / fpL
- fpmax is the highest frequency at which the high frequency side peak frequency fpH may change when the phoneme data is converted using the pitch maximum value Pitch_max
- fpmin is the phoneme data converted using the pitch minimum value Pitch_max.
- the low frequency side peak frequency fpL is the lowest frequency that may be shifted.
- the reference value AdB used in step ST34 and fpmax and fpmin used in step ST36 are configured to be input from the input unit 9 through a selection flow (ST39) using HMI.
- FIG. 16 shows a flow in which the user can arbitrarily set fpmax, fpmin, and A via the input unit 9.
- the input unit 9 displays to prompt the user to input fpmax and fpmin (ST391), and the user inputs fpmax and fpmin (ST392).
- a display is made so that the user inputs the reference value A of the difference from the maximum peak as the level of the peak to be extracted (ST393), and the user inputs A (ST394) to update fpmax, fpmin and A. (ST395).
- fpmax may be set to 4 kHz because elderly people are said to be difficult to hear above 4 kHz, or it may be half the sampling frequency according to the vehicle approach notification system, and the user can set it freely. I can do it.
- fpmin may be adjusted to the reproduction frequency band of the sound generator according to the vehicle approach notification device system, or 1 kHz, which is considered to be relatively sensitive to human ears, and can be set freely by the user. I can do it.
- the pitch parameter interpolation processing unit 3 performs an interpolation process between the maximum pitch value Pitch_max and the minimum pitch value Pitch_min calculated by the pitch parameter calculation unit 2 so as to change according to vehicle information such as the vehicle speed (ST37).
- the interpolation method in the interpolation process includes the interpolation method shown in FIG. 4 or 5 described in the first embodiment.
- the interpolation method may be arbitrarily set by the user via the input unit 9.
- FIG. 17 shows a flow in which the user can arbitrarily set the interpolation method via the input unit 9. This flow may be executed, for example, in step ST39 of FIG.
- the input unit 9 displays to prompt the user to input an interpolation method and a transition point (ST396).
- the user inputs an interpolation method and a transition point via the input unit 9 according to the display content (ST397), and updates to the transition point and interpolation method input by the user (ST398). In this way, the interpolation method desired by the user can be set.
- the pitch parameter update unit 4 generates a parameter table of a format corresponding to the system of the corresponding vehicle approach notification device for the pitch parameter interpolated by the pitch parameter interpolation processing unit 3, and the parameter storage unit of the storage device 8
- the parameter table stored in 81 is replaced with the generated parameter table and stored (ST38).
- FIG. 18 is a flowchart showing a flow of calculating the volume parameter of the sound quality adjusting device of the vehicle approach notification device according to Embodiment 3 of the present invention.
- the volume peak extraction unit 13 of the sound source sound quality extraction unit 1 reads out the corresponding phoneme stored in the phoneme storage unit 82 of the storage device 8 (ST21), and extracts the maximum volume peak Lp of the sample data (ST22). Note that the volume peak extraction unit 13 may extract the maximum volume peak Lp as the volume peak, but may extract an average volume peak at which the average volume obtained by taking an average value in a certain section becomes a peak.
- the volume parameter calculation unit 5 calculates the maximum volume level Level_max and the minimum volume level Level_min from the volume peak (maximum volume peak or average volume peak) Lp extracted by the volume peak extraction unit 13 of the sound source sound quality extraction unit 1. (ST23). For example, the following formula can be used to calculate the maximum volume level Level_max and the minimum volume level Level_min from the volume peak Lp.
- Level_max Lpmax / Lp
- Level_min Lpmin / Lp
- Lpmax represents the maximum volume when the phoneme data is converted using the maximum volume level Level_max
- Lpmin represents the minimum volume when the phoneme data is converted using the minimum volume level Level_min.
- FIG. 19 is a flowchart showing details of the selection flow (ST26) by HMI, in which Lpmax and Lpmin are input via the input unit 9.
- the input unit 9 displays to prompt the user to input Lpmax and Lpmin (ST261), and the user inputs Lpmax and Lpmin (ST262).
- Lpmax may be a value that can be heard even in a downtown area
- Lpmin may be a value that can be heard even in a quiet residential area at night, and can be set freely by the user.
- the volume parameter interpolation processing unit 6 performs an interpolation process between the volume maximum value Level_max and the volume minimum value Level_min calculated by the volume parameter calculation unit 5 so as to change according to vehicle information such as the vehicle speed (ST24).
- vehicle information such as the vehicle speed (ST24).
- the interpolation method in the interpolation processing there are the interpolation methods shown in FIGS. 8 and 9 described in the first embodiment.
- the interpolation method may be arbitrarily set by the user via the input unit 9.
- FIG. 20 shows a flow in which the user can arbitrarily set the interpolation method via the input unit 9. This flow may be executed, for example, in step ST26 of FIG.
- the input unit 9 displays to prompt the user to input an interpolation method and a transition point (ST264).
- the user inputs an interpolation method and a transition point via the input unit 9 according to the display content (ST265), and updates to the transition point and the interpolation method input by the user (ST266). In this way, the interpolation method desired by the user can be set.
- the volume parameter update unit 7 generates a parameter table in a format corresponding to the system of the corresponding vehicle approach notification device for the volume parameter interpolated by the volume parameter interpolation processing unit 6, and the parameter storage unit of the storage device 8
- the parameter table stored in 81 is replaced with the generated parameter table and stored.
- FIG. 21 is a block diagram showing an example of a configuration of a vehicle approach notification device simulator using the sound quality adjusting device of the vehicle approach notification device according to the third embodiment of the present invention.
- the vehicle approach notification device simulator 30 uses the pitch parameter and volume parameter stored in the parameter storage unit 81 in the sound quality adjustment device 110 shown in FIG. 14 to convert the phoneme stored in the phoneme storage unit into the pitch conversion unit 21 and This is for confirming the sound quality of the notification sound by generating the notification sound from the sounding body 23 such as a speaker after being converted by the volume conversion unit 22.
- a parameter table of parameters is stored in the parameter storage unit 81.
- the pitch conversion unit 21 receives a pitch parameter corresponding to the vehicle information output from the simulated vehicle information generation unit 20 transmitted from the parameter storage unit 81, converts the phoneme sound signal, and outputs the converted signal.
- the volume conversion unit 22 receives the volume parameter transmitted from the parameter storage unit 81 corresponding to the vehicle information output from the simulated vehicle information generation unit 20, and the sound output from the pitch conversion unit 21.
- the volume that is, the amplitude of the data is changed.
- the notification sound is generated from the sound generator 23 based on the notification sound signal output by converting the phoneme data in the pitch conversion unit 21 and the volume conversion unit 22, and the sound quality of the notification sound is confirmed.
- the user can reset the reference value A, fpmax, fpmin, Lpmax, Lpmin, pitch interpolation method, transition point, volume interpolation method, and transition point.
- the parameter can be changed until the content is satisfied.
- the embodiment described above shows a vehicle approach notification device sound quality adjustment device and a vehicle approach notification device simulator, and the vehicle approach notification device simulator can be incorporated as an adjustment tool on a personal computer, for example. .
- FIG. FIG. 22 is a block diagram showing a configuration of a vehicle approach notification device according to Embodiment 4 of the present invention
- FIG. 23 is a flowchart showing an operation flow of the vehicle approach notification device according to Embodiment 4 of the present invention.
- the vehicle approach notification device 40 includes a sound quality adjustment device 110, a pitch conversion unit 21, a volume conversion unit 22, a sound generator 23, a simulated vehicle information generation unit 24, a vehicle information switching unit 25, and the like.
- the vehicle approach notification device 40 is mounted on an electric vehicle 300 that generates at least a part of driving force by an electric motor, such as a hybrid vehicle or an electric vehicle.
- the sound quality adjustment apparatus 110 is the same as described in the third embodiment, and includes the input unit 9 and is a sound quality adjustment apparatus 110 configured to allow the user to set various coefficients.
- the simulated vehicle information generation unit 24 stores simulated vehicle information that simulates the vehicle speed when the electric vehicle 300 actually travels, and generates simulated vehicle information as necessary.
- the vehicle information switching unit 25 switches whether the vehicle information used by the sound quality adjusting device 110 is vehicle information generated from the simulated vehicle information generating unit 24 or actual vehicle information.
- the configuration and operation of each unit of the sound quality adjustment apparatus 110 that is, the parameter storage unit 81, the phoneme storage unit 82, the sound source sound quality extraction unit 1, the parameter setting unit 10, and the input unit 9 are the same as those described in the third embodiment.
- the pitch conversion unit 21, the volume conversion unit 22, and the sounding body 23 are respectively the pitch conversion unit 21, the volume conversion unit, and the sound generation in the vehicle approach notification device simulator 30 described in the first embodiment and the third embodiment. It has the same function as the body 23.
- the vehicle information switching unit 25 sets the vehicle information to be used as vehicle information generated from the simulated vehicle information generation unit 24 (ST40).
- the flow of FIG. 15 described in the third embodiment which is a pitch parameter update flow by the input from the input unit 9 by the sound quality adjusting device 110, is executed (ST41). That is, a table of pitch parameters obtained by the parameter setting unit 10 is stored in the parameter storage unit 81 using the reference values A, fpmax, fpmin, pitch interpolation method, and transition points input from the input unit 9 by the user.
- the sound volume adjusting apparatus 110 performs the volume parameter update flow by the input from the input unit 9, and the flow of FIG. 18 described in the third embodiment is executed (ST42). That is, the parameter storage unit 81 stores a volume parameter table obtained by the parameter setting unit 10 using Lpmax, Lpmin, the volume interpolation method, and the transition point input from the input unit 9 by the user.
- simulated vehicle information is generated from the simulated vehicle information generating unit 24, and the pitch parameter and the volume parameter stored in the parameter storage unit 81 by the above flow are used to generate a pitch parameter corresponding to the generated simulated vehicle information and According to the volume parameter, the pitch conversion unit 21 and the volume conversion unit 22 convert phoneme data to generate a notification sound from the sound generator 23 based on the output sound data, and the user listens to the notification sound (ST43).
- step ST43 NO If the user is not satisfied with the generated sound quality (ST43 NO), the process returns to step ST41, and the user returns the reference value A, fpmax, fpmin, Lpmax, Lpmin, pitch interpolation method, transition point, and volume interpolation method, Re-enter the transition point and repeat this loop until you are satisfied with the sound quality.
- the vehicle information switching unit 25 switches the vehicle information to be used to the vehicle information of the electric vehicle 300 itself, During actual operation, a notification sound is generated using the pitch parameter table and the volume parameter table stored in the parameter storage unit 81 of the sound quality adjusting device.
- the notification sound is auditioned while generating the simulated vehicle information.
- the notification sound may be generated based on the actual vehicle information while the electric vehicle 300 is actually running.
- the simulated vehicle information generation unit 24 and the vehicle information switching unit 25 can be omitted.
- the user can set various parameters arbitrarily, and the sound quality adjustment device that can easily adjust the sound quality by checking the result through the sound generator It is possible to provide the vehicle approach notification device provided.
- the vehicle approach notifying device equipped with the sound quality adjusting device 110 of the vehicle approach notifying device of the third embodiment provided with the input unit 9 has been described.
- a sound quality adjusting device of the vehicle approach notification device as shown in FIG. the simulated vehicle information generator 24 is not provided, and the user cannot directly change the sound quality.
- the vehicle approach notification device according to the present invention includes the sound quality adjusting device of the vehicle approach notification device according to any one of the first to third embodiments, the notification sound signal generation unit 200, and the sound generator 23. It should be.
- 1 sound source sound quality extraction unit 2 pitch parameter calculation unit, 3 pitch parameter interpolation processing unit, 4 pitch parameter update unit, 5 volume parameter calculation unit, 6 volume parameter interpolation processing unit, 7 volume parameter update unit, 8 storage device, 9 input Unit, 10 parameter setting unit, 11 FFT unit, 12 frequency peak extraction unit, 13 volume peak extraction unit, 20, 24 simulated vehicle information generation unit, 21 pitch conversion unit, 22 volume conversion unit, 23 sound generator, 25 vehicle information switching Unit, 30 vehicle approach notification device simulator, 40 vehicle approach notification device, 81 parameter storage unit, 82 phoneme storage unit, 100, 110 sound quality adjustment device, 200 notification sound signal generation unit, 300 electric vehicle
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Abstract
Description
図1は、本発明の実施の形態1による車両接近通報装置の音質調整装置の構成を示すブロック図である。また、図2は、本発明の実施の形態1による車両接近通報装置の音質調整装置のピッチパラメータを算出するフローを示すフロー図である。車両接近通報装置とは、ハイブリッド自動車や電気自動車など、少なくとも一部の駆動力を電動機によって発生する電動移動体の外部へ報知音を放射するための装置である。音源音質抽出部1のFFT部11は、記憶装置8の音素格納部82に格納された、該当する音素を読出し(ST11)、FFT(Fast Fourier Transform)処理を行う(ST12)。音素とは、車両接近通報装置が発生する報知音の素となる音のデータとして、例えばPCM(Pulse-code Modulation)による音のディジタルデータを所定時間分記憶させたループ音である。所定時間は、例えば1秒間といった音として認識できる短い時間である。音素は従来のエンジン音を想起するものだけに制限されず、正弦波やホワイトノイズ、メロディ音など、どのようなものでも良い。音源音質抽出部1の周波数ピーク抽出部12は、FFT部11でFFT処理された音素の周波数分布波形より、最大ピークの周波数、すなわち最大ピーク周波数(fp)の抽出を行う(ST13)。図3にFFT部11でFFT処理された音素の周波数分布波形の一例を示す。
Pitch_max=fpmax/fp
Pitch_min=fpmin/fp
Level_max=Lpmax/Lp
Level_min=Lpmin/Lp
図12は、本発明の実施の形態2による車両接近通報装置の音質調整装置におけるピッチパラメータ算出フローを示すフロー図である。装置の構成は図1と同様である。音源音質抽出部1のFFT部11は、記憶装置8の音素格納部82に格納された該当する音素を読出し(ST31)、FFT処理を行う(ST32)。図13にFFT部11でFFT処理された音素の周波数分布波形の、図3とは別の例を示す。音源音質抽出部1の周波数ピーク抽出部12は、FFT部11でFFT処理された音素の周波数分布波形より、ピークが最大となる最大ピーク周波数fpの抽出を行う(ST33)。次に、最大ピークに対する差が基準値A(dB)以下のピークを抽出し(ST34)、最大ピークを含む複数のピークのうち一番低周波数側に存在するピークの周波数を低周波数側ピーク周波数fpL、一番高周波数側に存在するピークの周波数を高周波数側ピーク周波数fpHとして抽出する(ST35)。
Pitch_max=fpmax/fpH
Pitch_min=fpmin/fpL
図14は、本発明の実施の形態3による車両接近通報装置の音質調整装置の構成を示すブロック図である。また、図15は、本発明の実施の形態3による車両接近通報装置の音質調整装置におけるピッチパラメータを算出するフローを示すフロー図である。音源音質抽出部1のFFT部11は、記憶装置8の音素格納部82に格納された該当する音素を読出し(ST31)、FFT処理を行う(ST32)。音源音質抽出部1の周波数ピーク抽出部12は、FFT部11でFFT処理された音素の周波数分布波形より、ピークが最大となる最大ピーク周波数fpの抽出を行う(ST33)。以上の処理は、実施の形態2と同じである。
Pitch_max=fpmax/fpH
Pitch_min=fpmin/fpL
Level_max=Lpmax/Lp
Level_min=Lpmin/Lp
図22は、本発明の実施の形態4による車両接近通報装置の構成を示すブロック図、図23は、本発明の実施の形態4による車両接近通報装置の動作フローを示すフロー図である。車両接近通報装置40は、音質調整装置110、ピッチ変換部21、音量変換部22、発音体23、模擬車両情報発生部24、車両情報切替部25などから構成されている。この車両接近通報装置40は、ハイブリッド自動車や電気自動車など少なくとも一部の駆動力を電動機によって発生する電動移動体300に搭載される。
Claims (16)
- 少なくとも一部の駆動力を電動機によって発生する電動移動体の外部へ報知音を放射するための車両接近通報装置の音質調整装置において、
前記報知音の素となる音素データを格納する音素格納部と、
この音素データを分析して音素の音質に係る特徴値を抽出する音源音質抽出部と、
この音源音質抽出部において抽出した前記音素の音質に係る特徴値を用いて、前記電動移動体の車両情報に対応して前記音素データを変換するパラメータを求めるパラメータ設定部と、
このパラメータ設定部で求めた前記パラメータを格納するパラメータ格納部と、
を備えたことを特徴とする車両接近通報装置の音質調整装置。 - 前記音源音質抽出部が抽出する前記音素の音質に係る特徴値は、前記音素データをFFT処理して求めた周波数分布のピークとなるピーク周波数fpであり、前記パラメータ設定部において求めるパラメータは、前記音素データのピッチを変換するためのピッチパラメータであることを特徴とする請求項1に記載の車両接近通報装置の音質調整装置。
- 前記ピッチパラメータの最大値Pitch_maxと最小値Pithch_minとを、予め前記報知音に対して設定した周波数最大値fpmaxと周波数最小値fpmin、および前記ピーク周波数fpを用いて、
Pitch_max = fpmax/fp
Pithch_min = fpmin/fp
により求めることを特徴とする請求項2に記載の車両接近通報装置の音質調整装置。 - 前記音源音質抽出部が、前記ピーク周波数fpにおけるレベルとの差が基準値A以下であるピークを抽出した場合、前記ピーク周波数fpを含んで、これら複数のピーク周波数のうち最も低い周波数をfpL、最も高い周波数をfpHとし、
前記ピッチパラメータの最大値Pitch_maxと最小値Pithch_minとを、予め前記報知音に対して設定した周波数最大値fpmaxと周波数最小値fpmin、および前記fpHと前記fpLを用いて、
Pitch_max = fpmax/fpH
Pithch_min = fpmin/fpL
により求めることを特徴とする請求項2に記載の車両接近通報装置の音質調整装置。 - 前記パラメータ設定部は、前記Pithch_minと前記Pitch_maxとの間を補間処理して、前記車両情報の値に対応したピッチパラメータを求めて、前記車両情報の値と前記ピッチパラメータの値とを対にした表形式で前記パラメータ格納部に格納することを特徴とする請求項3または請求項4に記載の車両接近通報装置の音質調整装置。
- ユーザーによりデータを入力するための入力部を備え、この入力部から前記fpmaxおよび前記fpminを入力することを特徴とする請求項3または請求項4に記載の車両接近通報装置の音質調整装置。
- ユーザーによりデータを入力するための入力部を備え、この入力部から前記基準値Aを入力することを特徴とする請求項4に記載の車両接近通報装置の音質調整装置。
- ユーザーによりデータを入力するための入力部を備え、この入力部から前記補間処理における補間方法を入力することを特徴とする請求項5に記載の車両接近通報装置の音質調整装置。
- 前記音源音質抽出部が抽出する前記音素の音質に係る特徴値は、前記音素データの音量レベルのピーク値Lpであり、前記パラメータ設定部において求めるパラメータは、前記音素データの音量を変更するための音量パラメータであることを特徴とする請求項1に記載の車両接近通報装置の音質調整装置。
- 前記音量パラメータの最大値Level_maxと最小値Level_minとを、予め前記報知音に対して設定した音量最大値Lpmaxと音量最小値Lpmin、および前記Lpを用いて、
Level_max = Lpmax/Lp
Level_min = Lpmin/Lp
により求めることを特徴とする請求項9に記載の車両接近通報装置の音質調整装置。 - 前記パラメータ設定部は、前記Level_minと前記Level_maxとの間を補間処理して、前記車両情報の値に対応した音量パラメータを求めて、前記車両情報の値と前記音量パラメータの値とを対にした表形式で前記パラメータ格納部に格納することを特徴とする請求項10に記載の車両接近通報装置の音質調整装置。
- ユーザーによりデータを入力するための入力部を備え、この入力部から前記Lpmaxおよび前記Lpminを入力することを特徴とする請求項10に記載の車両接近通報装置の音質調整装置。
- ユーザーによりデータを入力するための入力部を備え、この入力部から前記補間処理における補間方法を入力することを特徴とする請求項11に記載の車両接近通報装置の音質調整装置。
- 請求項1~13のいずれか1項に記載の車両接近通報装置の音質調整装置と、前記車両情報を模擬した模擬車両情報を出力する模擬車両情報発生部と、前記パラメータ格納部に格納されたパラメータと前記模擬車両情報発生部から出力される前記模擬車両情報とを用いて前記音素格納部に格納された前記音素データを変換して報知音の信号を発生する報知音信号生成部と、この報知音信号生成部により生成された報知音信号により報知音を発生する発音体とを備えたことを特徴とする車両接近通報装置シミュレータ。
- 請求項1~13のいずれか1項に記載の車両接近通報装置の音質調整装置と、前記パラメータ格納部に格納されたパラメータと前記車両情報とを用いて前記音素格納部に格納された前記音素データを変換して報知音の信号を発生する報知音信号生成部と、この報知音信号生成部により生成された報知音信号により報知音を発生する発音体とを備えたことを特徴とする車両接近通報装置。
- 前記車両情報が、実際の車両情報を模擬するデータとして保存された模擬車両情報と、前記電動移動体から取得する車両情報とに切り替え可能に構成されたことを特徴とする請求項15に記載の車両接近通報装置。
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JP2021054221A (ja) * | 2019-09-30 | 2021-04-08 | ラピスセミコンダクタ株式会社 | 音出力装置、通信コントローラ及び音生成器 |
US11745651B2 (en) | 2019-09-30 | 2023-09-05 | Lapis Semiconductor Co., Ltd. | Sound output device, communication controller, and sound generator that provides approaching notification sound while reducing MCU load |
JP7446753B2 (ja) | 2019-09-30 | 2024-03-11 | ラピスセミコンダクタ株式会社 | 音出力装置、通信コントローラ及び音生成器 |
WO2021224975A1 (ja) * | 2020-05-08 | 2021-11-11 | 三菱電機株式会社 | 報知音生成装置 |
JPWO2021224975A1 (ja) * | 2020-05-08 | 2021-11-11 |
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JP5847322B2 (ja) | 2016-01-20 |
DE112012007018T5 (de) | 2015-07-02 |
US9681240B2 (en) | 2017-06-13 |
JPWO2014061084A1 (ja) | 2016-09-05 |
CN104718110A (zh) | 2015-06-17 |
CN104718110B (zh) | 2016-10-12 |
US20150264500A1 (en) | 2015-09-17 |
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