JP5206617B2 - Sound control device and sound source - Google Patents

Description

  The present invention relates to a sound control device and a sound generation source.

  2. Description of the Related Art Conventionally, as a device that controls sound, a device that controls a sound environment when an alarm message (alarm sound) is output is known (for example, see Patent Document 1). The device described in Patent Document 1 is connected to the first and second speakers, and mutes the music output from the first speaker by a mute signal before outputting an alarm message to the driver from the first speaker. In addition, a predetermined amount of music output from the second speaker is muted by the mute signal.

Japanese Patent Laid-Open No. 9-73588

  However, the conventional sound control device cannot actively reduce the sound other than lowering the volume by the mute signal. For this reason, when outputting a warning message, music, etc. using a single speaker, it is not possible to flexibly control the sound environment, for example, reducing the music etc. slightly before outputting the warning message. For this reason, it is difficult to appropriately control both the alarm message and the music so that the driver can hear it.

  Therefore, the present invention has been made to solve such a technical problem, and an object thereof is to provide a sound control device and a sound generation source capable of selectively increasing or decreasing a sound in a predetermined frequency band. And

  That is, the sound control device according to the present invention is a sound control device that is connected to a sound generation source having a sound generation unit in a housing and controls sound output from the sound generation source into the vehicle. A notification sound output means for outputting a notification sound related to information to be notified from the unit, and a sound related to a predetermined frequency band among the sounds output from the sound generation unit when the notification sound is output. And a housing configuration changing means for changing the housing configuration of the sound generation source.

  In the sound control device according to the present invention, when the notification sound is output by the notification sound output unit, the case configuration change unit changes the case configuration of the sound generation source to control the sound related to the predetermined frequency band. Is done. As described above, since the housing configuration of the sound generation source can be changed so as to control the sound related to the predetermined frequency band, for example, the sound of the unnecessary frequency band other than the notification sound can be selectively reduced or only the notification sound can be controlled. Can be increased or decreased.

  Here, the casing configuration changing means increases the volume of the sound output from the sound generation source before the notification sound is output from the sound generation source, and then decreases the sound generation source. It is preferable to change the housing configuration.

  With this configuration, it is possible to make the listener notice a significant change in sound before outputting the notification sound. For this reason, it is possible to improve the auditory sensitivity that has been lowered by getting used to the steady sound, and to effectively give the listener a quiet feeling before outputting the notification sound. In this way, by controlling the sound environment before outputting the notification sound, it is possible to make the listener recognize the pre-touch of the output of the notification sound and to output the notification sound that is easy to hear for the listener. Can do.

  Further, it is preferable that the casing configuration changing unit changes the casing configuration of the sound generation source so that a resonance frequency or a frequency characteristic of the casing is changed. With this configuration, for example, even in a state where sound is output from audio, it is possible to emphasize only the notification sound while reducing the sound from audio.

  Further, it is preferable that the casing configuration changing means changes the casing configuration of the sound generation source based on a vehicle speed. By comprising in this way, environmental sounds, such as a noise which increases according to a vehicle speed, for example, can be reduced and a notification sound can be emphasized.

  Further, the casing configuration changing means may change the casing configuration of the sound generation source so as to increase the volume of the notification sound after reducing the volume of the sound output from the sound generation source. Is preferred. With this configuration, the listener's recognition of the notification sound can be further enhanced.

  The sound generation source according to the present invention is a sound generation source having a sound generation unit for generating sound in a housing, and a notification sound output unit that outputs a notification sound related to information to be notified from the sound generation unit. It is connected and has a case configuration change mechanism that changes the case configuration so that the resonance frequency or frequency characteristic of the case is changed when the notification sound is output from the sound generator. Composed.

  According to the sound generation source according to the present invention, the casing configuration can be changed so that the resonance frequency or frequency characteristic of the casing is changed by the casing configuration changing mechanism, so that the output sound is selectively increased or decreased. For this reason, for example, the sound environment can be flexibly controlled so that the notification sound can be easily heard.

  According to the present invention, sound in a predetermined frequency band can be selectively increased or decreased.

It is a block diagram which shows the structure outline | summary of a vehicle provided with the sound control apparatus which concerns on embodiment. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is a perspective view which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is a schematic diagram explaining operation | movement of the sound reduction mechanism of FIG. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound reduction mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound increase mechanism which the sound generation source which concerns on embodiment has. It is sectional drawing which shows an example of the sound increase mechanism which the sound generation source which concerns on embodiment has. It is a flowchart which shows operation | movement of the sound control apparatus which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  The sound control device according to the present embodiment is preferably employed when providing information to a vehicle occupant (listener) using sound or sound, for example.

  First, the outline of a vehicle including the sound control device according to the present embodiment will be described. FIG. 1 is a block diagram showing a schematic configuration of a vehicle including a sound control device 1 according to the present embodiment. A vehicle 3 shown in FIG. 1 includes an audio 30, an ECU (Electronic Control Unit) 10, and a speaker (sound generation source) 2. The ECU is a computer of an electronically controlled automobile device, and includes a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) and a RAM (Random Access Memory), an input / output interface, and the like.

  The audio 30 is connected to the speaker 2 and has a function of generating a signal for reproducing sound. As the audio 30, for example, a CD playback unit, an MD playback unit, an MP3 playback unit, a radio reception unit, or the like is used.

  The ECU 10 is connected to the speaker 2 and includes an alarm sound provision determination unit 11, an alarm sound generation unit 12, a sound environment determination unit 13, a sound increase control unit 14, and a sound reduction control unit 15.

  The warning sound provision determination unit 11 has a function of determining whether or not to provide a warning sound related to information to be warned to a passenger (a notification sound related to information to be notified). For example, the alarm sound providing determination unit 11 acquires vehicle information and information outside the vehicle from sensors (not shown), a navigation device, or the like provided in the vehicle 3 or a roadside support device arranged outside the vehicle, and an event to be alarmed occurs. It has a function to determine whether or not. Further, the alarm sound provision determination unit 11 has a function of outputting the alarm content to the alarm sound generation unit 12 when it is determined that an event to be alarmed has occurred.

  The alarm sound generation unit 12 has a function of generating a signal for reproducing a sound wave indicating the alarm content based on the alarm content output by the alarm sound provision determination unit 11. Further, the alarm sound generation unit 12 has a function of outputting the generated signal to the speaker 2.

  The sound environment determination unit 13 has a function of determining the sound environment in the vehicle. For example, the sound environment determination unit 13 inputs the sound in the vehicle from a microphone or the like (not shown) disposed in the vehicle, or inputs the signal generated by the audio 30 connected to the audio 30 to thereby generate the sound in the vehicle. It has a function to determine the environment (such as the sound pressure of the vehicle interior sound). The sound environment determination unit 13 has a function of determining increase / decrease in the output sound of the speaker 2 so that the sound environment is easy for the passenger to hear the alarm sound. For example, the sound environment determination unit 13 has a function of determining the increase / decrease timing so that the output sound of the speaker 2 is increased and then decreased before the alarm sound generation unit 12 outputs the alarm sound signal to the speaker 2. Have. In addition, for example, the sound environment determination unit 13 determines increase / decrease of sound related to a predetermined frequency band among output sounds of the speaker 2 before the alarm sound generation unit 12 outputs a signal of the alarm sound to the speaker 2. It has a function. Examples of the sound related to the predetermined frequency band include an alarm sound and an output sound of the audio 30. As described above, the sound environment determination unit 13 determines to selectively reduce only the sound in the unnecessary frequency band other than the alarm sound, or determines to increase or decrease only the alarm sound. Create a sound environment that makes it easy to hear alarm sounds. The sound environment determination unit 13 has a function of outputting a control signal to at least one of the sound increase control unit 14 and the sound reduction control unit 15 when the increase or decrease of the output sound of the speaker 2 is determined.

  The sound increase control unit 14 is configured to be able to control a sound increase mechanism to be described later of the speaker 2. The sound increase control unit 14 has a function of controlling the sound increase mechanism based on the control signal regarding the increase in the output sound of the speaker 2 output from the sound environment determination unit 13.

  The sound reduction control unit 15 is configured to be able to control a sound reduction mechanism to be described later of the speaker 2. The sound increase control unit 14 has a function of controlling the sound reduction mechanism based on a control signal related to the decrease in the output sound of the speaker 2 output from the sound environment determination unit 13.

  The alarm sound provision determination unit 11 and the alarm sound generation unit 12 described above function as a notification sound output unit, and the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15 function as a casing configuration change unit.

  Next, an outline of the configuration of the speaker 2 will be described. The speaker 2 is a sound generation source connected to the audio 30 and the ECU 10 and has a function of outputting sound into the vehicle. As the speaker 2, for example, a bass reflex type speaker in which a hole is formed in a baffle of a sealed speaker and a duct communicating with the hole is provided inside the housing is used. The speaker 2 includes a speaker unit 20 that outputs sound based on audio 30 and signals output from the ECU 10, a sound reduction mechanism 21, and a sound increase mechanism 22.

  The sound reduction mechanism 21 is a mechanism that changes the housing configuration of the speaker 2 so that sound in a predetermined frequency band is reduced. In other words, the sound reduction mechanism 21 is configured to be able to change the control range of the resonance frequency or the control range of the frequency characteristic specific to the housing of the speaker 2. For example, as the sound reduction mechanism 21, a mechanism that makes the internal volume of the housing variable, a mechanism that suppresses the sound output function, a mechanism that increases the sound absorption function, or the like is used.

  Hereinafter, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to the drawings. 2 to 11 are schematic diagrams for explaining the sound reduction mechanism 21 of the speaker 2. FIG. 2 is a side sectional view of the bass reflex type speaker 2. The speaker 2 has a substantially box-shaped housing. An opening 2a is formed in the baffle on the front side of the housing, and the speaker unit 20 is attached to the opening 2a. The baffle on the front side of the speaker 2 is formed with a port 2b that is an opening, and the end of a cylindrical duct 2c is connected to the port 2b. The shape of the port 2b may be a circle or a rectangle. Moreover, the cross section of the edge part of the duct 2c should just be formed according to the shape of the port 2b. A sound absorbing material or the like may be provided on the inner wall of the housing.

  In the bass reflex type speaker 2, sound is output from the speaker unit 20 to the front side of the housing based on the signal, and sound from the rear surface of the speaker unit 20 is output to the front side of the housing through the duct 2 c. Thus, since the inside of the housing communicates with the outside via the duct 2c, a resonance frequency depending on the internal volume of the housing, the length of the duct 2c, the cross-sectional area, and the like is generated.

  Here, the speaker 2 shown in FIG. 2 has a lid member 21 a for changing the volume inside the housing as the sound reduction mechanism 21. The lid member 21a has, for example, a plate shape and is disposed between the speaker unit 20 and the duct 2c. One end of the lid member 21a is attached to the baffle on the front side so as to be capable of opening and closing with the end as a fulcrum (arrow in the figure). That is, the lid member 21a is configured to partition the inside of the housing by its opening / closing operation and to change the internal volume small. As another example of changing the volume inside the housing, a shutter-like lid or a slit-like lid that partitions the inside of the housing may be used. Based on the signal of the sound reduction control unit 15, the lid member 21a is opened and closed, the volume inside the housing is changed, and the resonance frequency of the housing is changed.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 illustrated in FIG. 3 includes a duct length variable mechanism as the sound reduction mechanism 21. For example, a cylindrical expansion / contraction member 21b is attached to the end of the duct 2c. The inner diameter of the telescopic member 21b is substantially the same as the outer diameter of the duct 2c. The expansion / contraction member 21b is configured to be slidable in the longitudinal direction of the duct 2c in a state where one end of the duct 2c is accommodated therein (arrow in the figure). That is, the length of the duct can be changed longer by the expansion / contraction member 21b. The expansion / contraction member 21b is slid based on the signal from the sound reduction control unit 15, the duct length is changed, and the resonance frequency of the housing is changed. Also, the bass reflex type is changed to the sealed type by extending the telescopic member 21b to the rear wall of the speaker. The telescopic member 21b may have a bellows shape.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 4 includes a mechanism that makes the number of openings to the outside inside the housing variable as the sound reduction mechanism 21. For example, an opening 21c having a slit-shaped lid that can be opened and closed is formed on the upper surface of the housing. FIG. 4A shows the opening 21c with the slit-shaped lid closed, and FIG. 4B shows the opening 21c with the slit-shaped lid opened. Based on the signal of the sound reduction control unit 15, the opening 21c is opened and closed, and the resonance frequency of the housing is changed. In addition, the opening part 21c may be provided in the side surface and back surface of a housing | casing, and the several opening part 21c may be provided.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIGS. The speaker 2 shown in FIG. 5 includes a variable mechanism for the cross-sectional area of the duct 2 c as the sound reduction mechanism 21. For example, the port 2b is provided with a variable shutter 21d configured to change the degree of opening. The variable shutter 21d is configured by overlapping a plurality of plates, and is configured to be able to change the size of the opening as shown in FIGS. 6 (a) to 6 (c). 6A shows a state in which the variable shutter 21d is fully opened, FIG. 6B shows a state in which the variable shutter 21d has a reduced degree of opening, and FIG. 6C shows a state in which the variable shutter 21d is fully closed. Show. In the state shown in FIG. 6C, the configuration is changed from the bass reflex type to the sealed type. Based on the signal from the sound reduction control unit 15, the variable shutter 21d is opened and closed, the sectional area of the duct 2c is changed, and the resonance frequency of the housing is changed. The variable shutter 21d may be configured by a plate-like lid member, and the cross-sectional area of the duct 2c may be changed by a sliding operation.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 7 includes a duct cross-sectional area variable mechanism as the sound reduction mechanism 21. For example, the end of a cylindrical cylindrical duct 21e having different bottom and top areas is connected to the port 2b. The duct 21e has an area of the bottom surface larger than that of the upper surface, and an end on the bottom surface side is connected to the port 2b. And the duct 21e is comprised so that a cross-sectional area can be changed by operating the upper surface side (arrow in a figure). The duct 21e operates based on the signal from the sound reduction control unit 15, the cross-sectional area of the duct 21e is changed, and the resonance frequency of the housing is changed.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 8 includes a variable mechanism having a housing internal volume and a sound absorbing structure as the sound reduction mechanism 21. For example, a plurality of sound absorbing protrusions 21 f that absorb sound are provided inside the housing on the back side of the speaker 2. A movable plate 2i having a plurality of openings is attached inside the housing on the back side of the speaker 2 so as to be able to move back and forth with the sound absorbing protrusions 21f inserted into the openings. The movable plate 2i is moved back and forth to change the volume inside the housing and change the effective height of the sound absorbing protrusion 21f protruding into the housing (arrow in FIG. 8A). . FIG. 8B shows a case where the movable plate 2i is moved to a position where the housing internal volume is maximized. The movable plate 2i is moved back and forth based on the signal from the sound reduction control unit 15, the volume inside the housing and the sound absorption performance are changed, and the resonance frequency and frequency characteristics of the housing are changed. In addition, as a variable mechanism of the sound absorbing structure, a structure may be adopted in which the sound absorbing protrusion 21f is movably attached in a state where the sound absorbing protrusion 21f penetrates the rear surface of the housing of the speaker 2. Moreover, it is good also as a structure which changes not only the height of a sound absorption protrusion but a number and a shape.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 9 includes a sound absorbing structure variable mechanism as the sound reducing mechanism 21. For example, a plurality of sound absorbing protrusions 21 g that absorb sound are provided inside the housing on the back side of the speaker 2. The sound absorbing projection 21g has a tiltable mechanism that can change its posture. For example, it is configured to be operable from the tilted state shown in FIG. 9A to the raised state shown in FIG. 9B. Based on the signal from the sound reduction control unit 15, the posture of the sound absorbing protrusion 21g is changed, the sound absorbing performance is changed, and the frequency characteristic of the housing is changed. In addition, as a variable mechanism of the sound absorbing structure, a raising material may be employed as a material of a sound absorbing material (not shown) so that the effective thickness of the sound absorbing material can be changed by static electricity or the like.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 10 has a vibration damping mechanism for the cone 20 a provided in the speaker unit 20 as the sound reduction mechanism 21. For example, the cone 20a provided in the speaker unit 20 is provided with a clip member 21h that can switch between contact and non-contact with the cone 20a. The clip member 21h comes into contact with the cone 20a and physically suppresses vibration of the speaker unit 20. Based on the signal of the sound reduction control unit 15, the clip member 21h is brought into contact with or not in contact with the cone 20a, and the frequency characteristics of the output sound are changed. Although not shown, the speaker unit 20 may have a dehumidifying / humidifying mechanism for the cone 20a. By humidifying the corn 20a, it is possible to reduce the output sound of the speaker unit 20, and by dehumidifying the corn 20a as necessary, for example, generation of mold or the like in the rainy season can be avoided.

  Next, an example of the sound reduction mechanism 21 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 11 has a mechanism that suppresses the output of the speaker unit 20 as the sound reduction mechanism 21. For example, a lid member 21 i that can cover the output side of the speaker unit 20 is attached. The lid member 21i physically blocks the output side of the speaker unit 20 and suppresses output sound. Based on the signal of the sound reduction control unit 15, the lid member 21i is opened and closed, and the volume of the output sound is changed. When the speaker 2 is not in use, the lid member 21i is closed to provide a dustproof / dripproof structure.

  Next, an example of the sound increase mechanism 22 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 12 includes a resonance structure inside the housing as the sound increase mechanism 22. For example, a resonance member 21 j that resonates at a predetermined frequency is provided in the housing of the speaker 2. For example, the resonance member 21j resonates with a specific frequency inside the speaker and outputs an alarm sound. Based on the signal from the sound reduction control unit 15, the resonance function of the resonance member 21j is turned on, and an alarm sound is generated from inside the housing. The resonance member 21j may be configured to resonate with an alarm sound and function to increase the alarm sound.

  Next, an example of the sound increase mechanism 22 of the speaker 2 will be described in detail with reference to FIG. The speaker 2 shown in FIG. 13 includes a speaker unit 21k for alarm sound inside the housing as the sound increase mechanism 22. Based on the signal from the sound reduction control unit 15, an alarm sound is output from the speaker unit 21k. In this case, the volume of the alarm sound generated in the housing may be adjusted by attaching the variable shutter 21d shown in FIG. 5 to the port 2b.

  Next, the operation of the sound control device 1 according to this embodiment will be described. FIG. 14 is a flowchart showing the operation of the sound control apparatus 1 according to this embodiment. The control processing shown in FIG. 14 is repeatedly executed at a predetermined interval from the timing when the ignition is turned on, for example.

  As shown in FIG. 14, the sound control device 1 starts from an alarm determination process (S10). The process of S10 is a process executed by the alarm sound providing determination unit 11 to determine whether or not an alarm is necessary. If it is determined in step S10 that no alarm is required, the control process shown in FIG. 14 is terminated. On the other hand, if it is determined in the process of S10 that an alarm is necessary, the process proceeds to a sound environment determination process (S12).

  The process of S12 is a process which the sound environment determination part 13 performs and determines the sound environment in a vehicle. The sound environment determination unit 13 determines whether there is a sound already provided in the vehicle based on, for example, a signal from the audio 30 or a vehicle microphone. In the process of S12, when it is determined that no sound is provided to the vehicle before the alarm, the process proceeds to an alarm process (S18).

  The process of S18 is a process executed by the alarm sound generation unit 12 and the speaker 2 to provide an alarm sound to the vehicle. A signal related to an alarm may be output from the alarm sound generation unit 12 to the speaker 2, or an alarm sound may be output using the resonance member 21j shown in FIG. When the process of S18 ends, the control process shown in FIG. 14 ends.

  On the other hand, in the process of S12, when it is determined that the sound is provided to the vehicle before the alarm, the process proceeds to the sound environment control process (S14, S16). The process of S14 is a process executed by the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15 to control the sound environment. For example, the sound already provided is increased (S14), and then decreased (S16). As the sound increase processing, the sound may be gradually reduced from the initial state by using at least one of the sound reduction mechanisms shown in FIGS. May be increased. As a sound reduction process, sound reduction is performed using at least one of the sound reduction mechanisms shown in FIGS. When the process of S16 ends, the process proceeds to an alarm process (S18), and the control process shown in FIG. 14 ends.

  Thus, the control process shown in FIG. 14 is finished. By executing the control process shown in FIG. 14, the sound environment is prepared before the warning sound is output, so that a warning sound that is easily heard by the occupant is output. Further, by combining the sound reduction mechanism / sound increase mechanism shown in FIG. 2 to FIG. 13, sound environment operations other than the control operation shown in FIG. 14 can naturally be executed. For example, in the case of the speaker 2 shown in FIG. 13, the sound output from the speaker unit 20 is reduced and the opening area of the variable shutter 21d is gradually increased while the alarm sound is output from the speaker unit 21k. By controlling, the sound from the speaker 2 is reduced and the alarm sound can be gradually increased, so that it is possible to output an alarm sound that is more easily heard by the occupant. In addition, by controlling the opening area of the variable shutter 21d to be larger as the vehicle speed increases, it is possible to prevent the alarm sound from being buried in the ambient noise that increases according to the vehicle speed and becoming difficult to hear. Alternatively, the sound output from the speaker unit 20 may be reduced as the vehicle speed increases. Also, by providing the housing with a plurality of openings 21c and variable shutters 21d shown in FIGS. 4 to 6, it is possible to control the number of open / close, change the resonance frequency of the speaker, and control the volume. As described above, the sound control device 1 and the speaker 2 can control the volume according to the content and degree of warning, the amount of information, the ambient sound, the vehicle speed, and the like.

  As described above, according to the sound control device 1 according to the present embodiment, when the alarm sound is output by the alarm sound providing determination unit 11 and the alarm sound generation unit 12, the sound environment determination unit 13, the sound increase control unit 14 and the sound reduction control unit 15 change the housing configuration of the speaker 2 to control sound in a predetermined frequency band. As described above, since the housing configuration of the speaker 2 can be changed so as to control the sound related to the predetermined frequency band, for example, an unnecessary frequency band sound other than the alarm sound can be selectively reduced or only the alarm sound can be reduced. It can be increased or decreased.

  Further, according to the sound control device 1 according to the present embodiment, the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15 output the warning sound from the speaker 2 before being output from the speaker 2. Since the housing configuration of the speaker 2 can be changed so as to decrease after increasing the volume of the generated sound, it is possible to make the occupant notice a significant change in sound before outputting the warning sound. Become. As described above, it is possible to improve the auditory sensitivity that has been lowered by getting used to the steady sound, and to effectively give a sense of silence to the occupant before the alarm sound is output. By controlling the sound environment before the warning sound is output, it is possible to make the occupant recognize the pre-touch of the output of the warning sound and to output a warning sound that is easy to hear for the occupant.

  In addition, according to the sound control device 1 according to the present embodiment, the speaker 2 so that the resonance frequency or frequency characteristic of the housing is changed by the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15. For example, even in a state where sound is output from the audio 30, it is possible to emphasize only the warning sound while reducing the sound from the audio 30.

  In addition, according to the sound control device 1 according to the present embodiment, the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15 can change the housing configuration of the speaker 2 based on the vehicle speed. Therefore, it is possible to enhance the alarm sound by reducing environmental sounds such as noise that increases according to the vehicle speed, for example.

  Further, according to the sound control device 1 according to the present embodiment, the sound environment determination unit 13, the sound increase control unit 14, and the sound reduction control unit 15 reduce the volume of the sound output from the speaker 2 and then issue an alarm. Since the casing configuration of the speaker 2 can be changed so as to increase the sound volume, it is possible to further increase the recognition of the warning sound of the occupant.

  Further, according to the speaker 2 according to the present embodiment, since the casing configuration is changed so that the resonance frequency or frequency characteristics of the casing are changed by the sound reduction mechanism 21 and the sound increase mechanism 22, the sound to be output is Increase or decrease selectively. For this reason, for example, the sound environment can be flexibly controlled so that an alarm sound can be easily heard. Further, according to the speaker 2 according to the present embodiment, since the casing configuration is changed so that the resonance frequency or the frequency characteristic of the casing is changed by the sound reduction mechanism 21 and the sound increase mechanism 22, the sound quality is improved. The volume of a specific frequency band can be increased or decreased without significant loss. Moreover, according to the speaker 2 which concerns on this embodiment, an alarm sound can be simply produced | generated by the resonance member 21j. According to the loudspeaker 2 according to the present embodiment, since a new sound generation location does not occur, it is possible to avoid the passenger from suffering from the sound generation position. For this reason, it is possible to avoid giving a sense of resistance to the occupant. Furthermore, according to the speaker 2 according to the present embodiment, it is not necessary to change the mountability by providing a sound variable mechanism inside the speaker, and the versatility is excellent.

  In addition, embodiment mentioned above shows an example of the sound control apparatus which concerns on this invention, and a sound generation source. The sound control device and the sound generation source according to the present invention are not limited to the sound control device 1 and the speaker 2 according to the embodiment, and the sound control according to the embodiment is within a range not changing the gist described in each claim. The device may be modified or applied to others.

  For example, a plurality of sound reduction mechanisms / sound increase mechanisms shown in FIGS. 2 to 13 described in the embodiment may be provided, or the sound environment may be controlled by a combination not described in the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Sound control apparatus, 2 ... Speaker (sound generation source), 3 ... Vehicle, 10 ... ECU, 11 ... Alarm sound provision judgment part (notification sound output means), 12 ... Alarm sound generation part (notification sound output means), DESCRIPTION OF SYMBOLS 13 ... Sound environment determination part (case structure change means), 14 ... Sound increase control part (case structure change means), 15 ... Sound reduction control part (case structure change means), 20 ... Speaker unit, 21 ... Reduction Sound mechanism, 22 ... Sound increase mechanism, 30 ... Audio.

Claims (6)

A sound control device that is connected to a sound generation source having a sound generation unit in a housing and controls sound output from the sound generation source into the vehicle,
A notification sound output means for outputting a notification sound related to information to be notified from the sound generator;
A housing configuration changing means for changing a housing configuration of the sound generation source so as to control a sound related to a predetermined frequency band among the sounds output from the sound generating section when the notification sound is output; ,
A sound control apparatus comprising:   The casing configuration changing means increases the volume of the sound output from the sound generation source before the notification sound is output from the sound generation source, and then decreases the volume of the sound generation source. The sound control device according to claim 1, wherein the configuration is changed.   The sound control device according to claim 1, wherein the case configuration changing unit changes a case configuration of the sound generation source so that a resonance frequency or a frequency characteristic of the case is changed.   The sound control device according to any one of claims 1 to 3, wherein the casing configuration changing unit changes a casing configuration of the sound generation source based on a vehicle speed.   The case configuration change unit changes the case configuration of the sound generation source so as to increase the volume of the notification sound after reducing the volume of the sound output from the sound generation source. The sound control device described. A sound generation source having a sound generation unit for generating sound in a housing,
It is connected to a notification sound output means for outputting a notification sound related to information to be notified from the sound generation unit, and when the notification sound is output from the sound generation unit, the resonance frequency or frequency characteristic of the casing is changed. Having a chassis configuration change mechanism for changing the chassis configuration to
A sound source characterized by

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