JP2011148473A - On-vehicle acoustic device and volume adjustment method for on-vehicle acoustic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic signal having a constant volume without giving any feeling of wrongness to an occupant being sit on a seat in response to an occupant sitting state. <P>SOLUTION: This on-vehicle acoustic device comprises a speaker 12 arranged for each seat 3 within a compartment space 2 so as to output acoustic sound signal from a sound source 11, a respective volume adjustment part 16 corresponding to each seat 3 so as to adjust a volume of acoustic signal transmitted to the speaker 12 at the seat 3, and a volume adjusting control part 23 for controlling the respective volume adjustment part 16 corresponding to each seat 3 of a plurality of seats 3 within the compartment space 2 so as to keep a volume of acoustic signal flowing at a receiving point 4 for each seat 3 to be controlled in a constant value in response to a sitting state for each seat 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle acoustic device disposed in a vehicle interior space of a vehicle or the like and a volume adjustment method for the in-vehicle acoustic device, for example.

  Conventionally, in-vehicle acoustic devices arranged in a passenger compartment of a vehicle or the like, for passengers seated in a front seat such as a driver seat and a passenger seat in front of the vehicle, and passengers seated in a rear seat behind the vehicle Provides sound signals such as music from sound sources. The sound source corresponds to a radio, a television, a tape playback device, a CD playback device, an MD playback device, a DVD playback device, or the like.

  For example, in a conventional in-vehicle acoustic device, when a passenger's seating is detected for each seat, a technology is known in which the volume of an acoustic signal can be adjusted by receiving a volume adjustment operation of a seated seat based on the detection result. ing. As a result, in the conventional on-vehicle acoustic device, a seated passenger can freely adjust the volume of the acoustic signal.

  In addition, a conventional vehicle-mounted acoustic device has a technology that detects the position and number of passengers in a passenger compartment and controls an amplifier that amplifies an acoustic signal to be output according to the position and number of passengers. It has been. As a result, the conventional in-vehicle acoustic device can provide an optimal sound field in the passenger compartment space according to the position and number of passengers.

  In addition, in a conventional on-vehicle acoustic device, a door speaker system configured with a speaker set such as a door speaker and a rear speaker that outputs sound to the entire vehicle compartment space, and a speaker set arranged for each seat in the vehicle compartment space The seat speaker system comprised by this. In this in-vehicle acoustic device, the door speaker system and the seat speaker system are turned on / off according to the seating situation of the passenger, so that an optimal sound field is generated in the passenger compartment space according to the seating situation of the passenger. Can be provided.

JP 2007-30732 A Japanese Utility Model Publication No. 60-184751 JP 2002-112400 A

  In the first place, the above-mentioned conventional vehicle-mounted acoustic device provides an acoustic signal having an optimal sound field and volume to a passenger seated in each seat in the passenger compartment according to the seating situation of the passenger. However, this does not mean that an acoustic signal having the same volume is provided to a seated passenger.

  In the above-mentioned conventional in-vehicle acoustic device, when the seating situation changes due to the movement of the seat, etc., the seating seat adjacent to the seating change seat is changed according to the volume change of the acoustic signal corresponding to the seating change seating. The volume that flows in fluctuates extremely. For example, when an acoustic signal is being provided to a driver seat and a passenger seat, the acoustic signal flows between the driver seat and the passenger seat, but the passenger in the passenger seat moves to the rear seat. If the passenger seat speaker is turned off, the volume of the acoustic signal flowing into the driver seat will be extremely reduced. As a result, in the in-vehicle acoustic device, there is a possibility that the passenger may feel uncomfortable due to the fluctuation of the acoustic signal according to the change in the seating.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an on-vehicle acoustic device that provides an acoustic signal of the same volume without giving a sense of incongruity to a seated passenger according to the seating situation. Another object of the present invention is to provide a volume adjustment method for an on-vehicle acoustic device.

  In order to achieve the above object, an on-vehicle acoustic device according to the present invention is arranged for each seat in a passenger compartment space, and corresponds to each seat, and an acoustic output unit that acoustically outputs an acoustic signal from a sound source. A volume adjusting unit that adjusts the volume of an acoustic signal transmitted to the sound output unit, and a listening point for each seat to be controlled among a plurality of seats in the passenger compartment space according to the seating situation for each seat. And a control unit that controls a volume adjustment unit corresponding to each seat so that the volume of the flowing acoustic signal is the same.

  Further, the volume adjustment method of the in-vehicle acoustic device according to the present invention is arranged for each seat in the passenger compartment space, and corresponds to each seat, and an acoustic output unit that acoustically outputs an acoustic signal from a sound source. A volume adjustment method for an in-vehicle audio device having a volume adjustment unit for adjusting a volume of an acoustic signal transmitted to an acoustic output unit, the seating state detection step for detecting a seating state for each seat, and the seating state detection Depending on the seating status of each seat detected in the step, the volume of the acoustic signal flowing at the listening point for each seat to be controlled is the same among the plurality of seats in the passenger compartment space, And a control step for controlling a volume control unit corresponding to each seat.

  In the on-vehicle acoustic device and the sound volume adjusting method of the present invention configured as described above, the sound that flows at the listening point for each seat to be controlled among the plurality of seats in the passenger compartment space according to the seating situation. The volume control unit corresponding to each seat is controlled so that the signal volume is the same. As a result, the in-vehicle acoustic device and the volume adjustment method thereof according to the present invention have an effect that an acoustic signal having the same volume can be provided without giving a sense of incongruity to a seated passenger to be controlled according to the seating situation. .

FIG. 1 is a block diagram illustrating a schematic configuration of the in-vehicle acoustic device according to the first embodiment. FIG. 2 is an explanatory diagram illustrating an example of a seat position and a speaker position in the passenger compartment space. FIG. 3 is an explanatory diagram showing an example of the contents of the volume adjustment table. FIG. 4 is an explanatory diagram illustrating an example of an operation related to the sound field characteristic setting process. FIG. 5 is a flowchart showing the processing operation of the control unit related to the first volume adjustment processing. FIG. 6 is a block diagram illustrating a schematic configuration of the in-vehicle acoustic device according to the second embodiment. FIG. 7 is an explanatory diagram showing an example of the contents of the change amount table. FIG. 8 is a flowchart showing the processing operation of the control unit related to the second volume adjustment processing.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vehicle acoustic device and a volume adjustment method for a vehicle acoustic device disclosed in the present application will be described in detail based on the drawings.

  FIG. 1 is a block diagram illustrating a schematic configuration of the in-vehicle acoustic device according to the first embodiment, and FIG. 2 is an explanatory diagram illustrating an example of a seat position and a speaker position in the passenger compartment space. The vehicle-mounted acoustic device 1 shown in FIG. 1 corresponds to, for example, an audio device mounted in the passenger compartment space 2, and includes a sound source 11, a speaker 12, a main volume adjustment unit 13, a sound field correction unit 14, and an equalizer unit 15. , An individual volume control unit 16, a seating sensor 17, an operation unit 18, and a control unit 19.

  The vehicle compartment space 2 shown in FIG. 2 includes, for example, four seats 3, and the seat 3 includes a driver seat 3 </ b> A and a passenger seat 3 </ b> B in front of the vehicle, and rear seats 3 </ b> C and 3 </ b> D behind the vehicle. For convenience of explanation, the driver's seat 3A is A seat, the passenger seat 3B is B seat, the rear seat 3C behind the A seat is C seat, and the rear seat 3D behind the B seat is D seat. Further, the speaker 12 includes an A seat speaker 12A corresponding to the A seat, a B seat speaker 12B corresponding to the B seat, a C seat speaker 12C corresponding to the C seat, and a D seat speaker 12D corresponding to the D seat.

  The A-seat speaker 12A and the B-seat speaker 12B are disposed, for example, on an instrument panel, a seat speaker, a seated seat shoulder, a seated headrest, or the like. In addition, the C seat speaker 12C and the D seat speaker 12D are disposed, for example, on a ceiling, a front seat shoulder, an own seat shoulder, an own headrest, or the like. Each seat 3A-3D has a listening point 4 (4A-4D). The listening point 4 corresponds to, for example, a space in the vicinity of the ears of the passenger seated in the seat 3. Further, the listening point 4 of each seat 3 is the listening point 4A for the A seat, the listening point 4B for the B seat, the listening point 4C for the C seat, and the listening point 4D for the D seat. .

  The sound source 11 shown in FIG. 1 corresponds to, for example, a TV tuner unit, a radio tuner unit, a CD playback unit, a DVD playback unit, a tape playback unit, or an MD playback unit, and outputs a sound signal such as music or conversation. It is. The main volume adjustment unit 13 collectively adjusts the volume of the acoustic signal from the sound source 11. The sound field correction unit 14 is configured by a plurality of sound field correction units 14 </ b> A to 14 </ b> D corresponding to each seat 3, and corrects the sound field of the acoustic signal whose volume is adjusted by the main volume adjustment unit 13. The sound field correction unit 14A corresponds to the A seat, the sound field correction unit 14B corresponds to the B seat, the sound field correction unit 14C corresponds to the C seat, and the sound field correction unit 14D corresponds to the D seat. The equalizer unit 15 corresponds to each seat 3, is configured by a plurality of equalizer units 15 </ b> A to 15 </ b> D, and corrects the frequency characteristics of the acoustic signal subjected to the sound field correction by the sound field correction unit 14. The equalizer portion 15A corresponds to the A seat, the equalizer portion 15B corresponds to the B seat, the equalizer portion 15C corresponds to the C seat, and the equalizer portion 15D corresponds to the D seat.

  Further, the individual volume adjusting unit 16 is configured by a plurality of individual volume adjusting units 16 </ b> A to 16 </ b> D corresponding to each seat 3, and adjusts the volume of the acoustic signal whose frequency characteristic is corrected by the equalizer unit 15. The individual volume adjustment unit 16A corresponds to the A seat, the individual volume adjustment unit 16B corresponds to the B seat, the individual volume adjustment unit 16C corresponds to the C seat, and the individual volume adjustment unit 16D corresponds to the D seat. Furthermore, the individual sound volume adjustment unit 16 outputs the sound signal whose sound volume has been adjusted to the speaker 12 corresponding to the corresponding seat. For example, the individual volume adjustment unit 16A outputs the sound signal whose volume has been adjusted to the A-seat speaker 12A. In addition, the individual volume adjusting unit 16D outputs the sound signal whose volume has been adjusted to the D seat speaker 12D. The seating sensor 17 is disposed for each seat 3 and corresponds to a pressure sensor or the like that detects the seating of the passenger's seat 3. Further, the operation unit 18 corresponds to a part for inputting various information.

  The control unit 19 includes a sound field correction control unit 21, an equalizer control unit 22, a volume adjustment control unit 23, a volume adjustment table 24, and a seating pattern specifying unit 25. The sound field correction control unit 21 controls the sound field correction unit 14 corresponding to each seat 3 based on the sound field correction value corresponding to the setting operation of the operation unit 18. The equalizer control unit 22 controls the equalizer unit 15 corresponding to each seat 3 based on the equalizer correction value corresponding to the setting operation of the operation unit 18.

  The seating pattern specifying unit 25 specifies a seating pattern corresponding to the seating situation in the passenger compartment space 2 based on the detection result of the seating sensor 17. The seating pattern identification unit 25 includes a seating situation recognition unit 31, a mute seat recognition unit 32, a control target seat recognition unit 33, and a pattern identification unit 34. The seating status identification unit 31 recognizes seats of all seats 3 in the passenger compartment space 2 based on the detection results of the seating sensors 17 for all seats 3 in the passenger compartment space 2. In addition to the detection result of the seating sensor 17, the seating state recognition unit 31 also seats the seat 3 set as seated according to the manual setting operation of the operation unit 18 regardless of whether the passenger is seated or not. It shall be recognized as seat 3.

  The mute seat recognizing unit 32 recognizes whether or not the sound mute of the speaker 12 for each seat 3 in the passenger compartment space 2 is set. The control target seat recognition unit 33 recognizes the seat 3 being seated as the seat 3 to be controlled, excluding the seat 3 being voice-muted among the seats 3 being seated. The pattern specifying unit 34 specifies seating patterns related to all seats 3 in the passenger compartment space 2 based on the seats 3 to be controlled.

  Further, the volume adjustment control unit 23 controls the individual volume adjustment unit 16 corresponding to each seat 3 based on the gain adjustment value corresponding to the setting operation of the operation unit 18 or the gain adjustment value stored in the volume adjustment table 24. To do. FIG. 3 is an explanatory diagram showing an example of the table contents of the volume adjustment table 24.

The volume adjustment table 24 shown in FIG. 3 is provided for each individual volume adjustment unit 16 for the listening point 4 of the seat 3 to be controlled to have the same volume for each seating pattern 24A related to all seats 3 in the passenger compartment space 2. This corresponds to a table storing gain adjustment values 24B. The gain adjustment value 24B for each seating pattern 24A is, for example, the gain adjustment value of the individual volume adjusting unit 16 that is measured at the time of shipment from the factory and at which the sound signal collected at the listening point 4 of the seat 3 to be controlled has the same volume. It corresponds to. When the number of seats in the vehicle interior space 2 is 4, 2 ⁴ = 16 types of seating patterns are required, and when the number of seats in the vehicle interior space 2 is 5, 2 ⁵ = 32 types of seating patterns are required.

  The volume adjustment control unit 23 has a seating pattern in which the A seat and the B seat are the seats 3 to be controlled, that is, the A seat and the B seat are ON, and the C seat and the D seat are OFF. In the volume adjustment table 24, the gain adjustment values of the individual volume adjustment units 16A and 16B corresponding to the A seat and the B seat are set to “−3” in the case of the seating pattern in which the A seat and the B seat are ON and the C seat and the D seat are OFF. “, The gain adjustment value of the individual volume adjustment units 16C and 16D corresponding to the C seat and the D seat is managed as“ −∞ (infinite) ”. The volume adjustment control unit 23 has a seating pattern in which the A seat, the B seat, and the D seat are controlled seats, that is, the A seat, the B seat, and the D seat are ON, and the C seat is OFF. The volume adjustment table 24 indicates the gain adjustment value of each individual volume adjustment unit 16 corresponding to the A seat, the B seat, and the D seat in the case of the seating pattern in which the A seat, the B seat, and the D seat are ON and the C seat is OFF. 6 ”, the gain adjustment value of the individual volume adjustment unit 16 corresponding to the C seat is managed as“ −∞ ”.

  When the seating pattern specifying unit 25 specifies the current seating pattern in the passenger compartment 2, the volume adjustment control unit 23 sets the gain adjustment value of each individual volume adjusting unit 16 corresponding to the current seating pattern to the volume adjustment table 24. Read from. The volume adjustment control unit 23 sets the read gain adjustment value in each individual volume adjustment unit 16.

  Each individual volume adjustment unit 16 adjusts the volume of the sound signal corrected by the equalizer unit 15 corresponding to the seat based on the gain adjustment value being set, and outputs the sound signal thus adjusted from the speaker 12 corresponding to each seat. To do. Note that the sound signals collected at the listening point 4 of the seat 3 to be controlled have the same volume. For example, when the A seat and the C seat are controlled objects, the sound signals flowing at the listening point 4A for the A seat and the listening point 4C for the C seat have the same volume.

  Further, each speaker 12 arranged for each seat 3 is a speaker having a directivity characteristic that attenuates an acoustic signal, for example, attenuates 6 dB or more so that an acoustic signal to be acoustically output does not flow into the listening point 4 of the adjacent seat 3. It is. For example, the A-seat speaker 12A attenuates the acoustic signal so that the acoustic signal to be acoustically output does not flow into the adjacent listening point 4B.

  FIG. 4 is an explanatory diagram illustrating an example of an operation related to the sound field characteristic correction process. At the listening point 4 of the seat 3 to be controlled, in addition to the acoustic signal from the speaker 12 corresponding to the seat, the acoustic signal is output from the speaker 12 corresponding to the adjacent seat in response to the ON driving of the speaker 12 corresponding to the adjacent seat. Sound leakage occurs. As a result, the occupant of the seat 3 to be controlled has a feeling of sound expansion in addition to the sound signal from the speaker 12 corresponding to the seat and the sound leakage from the adjacent speaker 12 corresponding to the seat. It becomes easy to do.

  Therefore, in the sound field correction control unit 21 that controls each sound field correction unit 14, the sound corresponding to the listening point 4 of the seat 3 to be controlled is turned off when the speaker 12 corresponding to the seat 3 adjacent to the control target seat 3 is turned off. Select a sound field correction filter that broadens the field. The sound field correction unit 14 widens the sound field for the listening point 4 by correcting the sound field in which the virtual sound source 12X is virtually arranged at a position away from the actual speaker 12 shown in FIG. To do. A transfer function from the seat-corresponding speaker 12 to the listening point 4 is C (z), and a transfer function Pw (z) from the virtual sound source 12X to the listening point 4 is used. In this case, the sound field correction filter H (z) is Pw (z) / C (z).

  The sound field correction control unit 21 selects a sound field correction filter that widens the sound field, and sets the selected sound field correction filter in the sound field correction unit 14 corresponding to the seat to be controlled. As a result, even when the speaker 12 corresponding to the adjacent seat is OFF, the sound field at the listening point 4 of the seat 3 to be controlled is widened, which contributes to an improvement in the feeling of sound expansion.

  Furthermore, the sound field correction control unit 21 selects a sound field correction filter that narrows the sound field with respect to the listening point 4 of the seat 3 to be controlled when the speaker 12 corresponding to the adjacent seat is turned on. Note that the sound field correction unit 14 narrows the sound field with respect to the listening point 4 by correcting the sound field in which the virtual sound source 12X is virtually disposed at a position adjacent to the actual speaker 12 shown in FIG. To do. The transfer function from the seat-corresponding speaker 12 to the listening point 4 is C (z), and the transfer function Pn (z) from the virtual sound source 12X to the listening point 4 is assumed. In this case, the sound field correction filter H (z) is Pn (z) / C (z). The sound field correction control unit 21 selects a sound field correction filter that reduces the sound field, and sets the selected sound field correction filter in the sound field correction unit 14 corresponding to the seat to be controlled.

  Next, the operation of the in-vehicle acoustic device 1 according to the first embodiment will be described. FIG. 5 is a flowchart showing the processing operation of the control unit 19 related to the first volume adjustment processing. The first volume adjustment process shown in FIG. 5 is a process for controlling the individual volume adjustment unit 16 so that an acoustic signal having the same volume flows at the listening point 4 of each seat 3 to be controlled according to the current seating pattern to be controlled. It is.

  In FIG. 5, the seating state recognition unit 31 in the control unit 19 recognizes a seat being seated based on the detection result of the seating sensor 17 of each seat 3 in the passenger compartment space 2 (step S11). Note that the seating state recognition unit 31 actually recognizes the seat 3 being seated by the passenger based on the detection result of the seating sensor 17, and actually the passenger according to the setting operation of the operation unit 18. Is recognized as a seated seat even if it is not seated in the seat 3. When the mute seat recognizing unit 32 in the control unit 19 recognizes the seat being seated, the mute seat recognizing unit 32 recognizes the seat in which the audio mute is set, that is, the mute seat among the seats 3 in the passenger compartment space 2 (step S12). The mute seat can be set according to the setting operation of the operation unit 18.

  The control target seat recognition unit 33 in the control unit 19 recognizes the seat being seated as the seat 3 to be controlled, excluding the mute seat recognized in step S12 from the seated seat recognized in step S11 (step S13). ). Further, the pattern specifying unit 34 in the control unit 19 specifies the seating patterns related to all the seats 3 in the passenger compartment space 2 based on the seat 3 to be controlled (step S14). When the seating pattern is specified, the volume adjustment control unit 23 in the control unit 19 reads the gain adjustment value of each individual volume adjustment unit 16 corresponding to this seating pattern from the volume adjustment table 24 (step S15). Then, the volume adjustment control unit 23 sets the read gain adjustment value in each corresponding individual volume adjustment unit 16 (step S16).

  Each individual volume adjustment unit 16 adjusts the volume of the acoustic signal adjusted by each equalizer unit 15 based on the set gain adjustment value (step S17). When the control objects are the A seat and the C seat, the A seat speaker 12A and the C seat speaker 12C are turned ON, and sound signals of the same volume flow at the listening point 4A for the A seat and the listening point 4B for the C seat.

  Then, the control unit 19 sequentially monitors the seating situation in the passenger compartment space 2 through the seating situation recognition unit 31 and the mute seat recognition unit 32, and whether or not a seating change for each seat 3 in the passenger compartment space 2 is detected. Is determined (step S18). The seating change refers to a seating change such as a passenger getting off or boarding, a seating change corresponding to a setting operation while the operation unit 18 is seated, a seating change corresponding to a sound mute setting operation of the operation unit 18, etc. It corresponds to.

  When detecting a change in seating (Yes at Step S18), the control unit 19 proceeds to Step S11 in order to recognize the seat 3 that is seated in each seat 3. Further, when the seating change is not detected (No at Step S18), the control unit 19 ends this processing operation while keeping the gain adjustment value currently set in each individual volume adjustment unit 16 being set.

  In the first volume adjustment process shown in FIG. 5, when the seating pattern of all the seats 3 in the passenger compartment space 2 is specified, the gain adjustment value of the individual volume adjustment unit 16 of each seat 3 corresponding to this seating pattern is stored in the volume adjustment table. Read from 24. Further, in the first volume adjustment process, each gain adjustment value is set in the individual volume adjustment unit 16 of each seat 3, and the volume of the acoustic signal is adjusted by each individual volume adjustment unit 16 based on the gain adjustment value being set, The sound signal flowing through the listening point 4 corresponding to the seat to be controlled has the same volume. As a result, in the first volume adjustment process, even if a change in seating occurs, the acoustic signal flowing through the listening point 4 corresponding to the controlled seat is the same volume, so the passenger sitting in the controlled seat 3 feels uncomfortable. Can be avoided.

  In the first embodiment, when the seating pattern of all the seats 3 in the passenger compartment space 2 is specified, the gain adjustment value of the individual volume adjusting unit 16 of each seat 3 corresponding to this seating pattern is read from the volume adjustment table 24, and 3, a gain adjustment value is set in the individual volume adjustment unit 16. Further, in the first embodiment, the volume of the acoustic signal is adjusted by each individual volume adjustment unit 16 based on the gain adjustment value being set, and the acoustic signal flowing in the listening point 4 corresponding to the seat to be controlled has the same volume. As a result, in the first embodiment, even if a change in seating occurs, the sound signal flowing through the listening point 4 corresponding to the seat to be controlled has the same volume level, which makes the passenger seated in the seat 3 to be controlled feel uncomfortable. Such a situation can be avoided.

  Furthermore, in the first embodiment, since the seating sensor 17 for detecting the seating of the passenger on the seat 3 is provided, the current seating situation in the passenger compartment space 2 can be automatically recognized.

  Further, in the first embodiment, when the speaker 12 corresponding to the seat adjacent to the target seat is turned off, a sound field correction filter that makes the sound field of the acoustic signal relatively wide is added to the sound field correction unit 14 corresponding to the target seat. Set. As a result, in the first embodiment, even when the adjacent seat-corresponding speaker 12 is turned off during the sound output of the seat-corresponding speaker 12, the listening corresponding to the target seat is not affected by the adjacent seat-corresponding speaker 12. It is possible to suppress a change in the sound spreading feeling at the point 4.

  Further, in the first embodiment, the speaker 12 arranged for each seat 3 has a directivity characteristic for attenuating the sound signal so that the sound signal for sound output does not flow into the listening point 4 of the adjacent seat 3. The influence of the fluctuation of the sound image localization due to the acoustic signal of the seat can be surely prevented.

  In the first embodiment, the gain adjustment value of each individual volume adjustment unit 16 is set in accordance with the current seating pattern in the passenger compartment space 2, but the present invention is not limited to the seating pattern, and can respond to seating changes. The gain adjustment value may be set according to the seating change pattern. Hereinafter, the embodiment in this case will be described in detail as a second embodiment.

  FIG. 6 is a block diagram illustrating a schematic configuration of the in-vehicle acoustic device according to the second embodiment. In addition, about the structure same as the vehicle-mounted audio apparatus 1 shown in FIG. 1, the description is abbreviate | omitted by attaching | subjecting the same code | symbol. The vehicle acoustic device 1 shown in FIG. 1 differs from the vehicle acoustic device 1A shown in FIG. 6 in that a seating change pattern specifying unit 28 is provided instead of the seating pattern specifying unit 25 and a volume adjustment table 24 is used instead. The change amount table 27 is provided.

  The seating change pattern specifying unit 28 includes a seating change detection unit 41, a seat recognition unit 42, a mute seat recognition unit 43, a control target seat recognition unit 44, and a pattern specification unit 45. The seating change detection unit 41 detects the seating change of the seat 3 in the passenger compartment space 2 based on the detection result of the seating sensor 17. The seating change refers to a seating change caused by a passenger's seat movement such as boarding or getting off of the vehicle based on a detection result of the seating sensor 17, a setting operation during the seating of the operation unit 18, a mute setting operation, or the like. Equivalent to changing seating.

  The seat recognition unit 42 recognizes the seat of the seat change in the passenger compartment space 2 based on the detection result of the seat change detection unit 41. The mute seat recognizing unit 43 determines whether or not the seat 3 whose seat change has occurred is a mute seat for which audio mute is being set. The control subject seat recognition unit 44 recognizes the seat change 3 as the control subject seat 3 when the seat change seat 3 is not a mute seat. The pattern specifying unit 45 specifies a seating change pattern among the seats 3 to be controlled. The seating change pattern corresponds to, for example, the pattern of A → B when the seat B changes while seating the seat A, and for example, the seat C changes while seating the seat A and seat B. The case corresponds to the pattern of A → C and B → C.

  FIG. 7 is an explanatory diagram showing an example of the contents of the change amount table 27. The change amount table 27 shown in FIG. 1-No. 6 types of change up to 6 are managed. No. The change amount of 1 corresponds to the gain adjustment value of the individual volume adjustment unit 16 corresponding to the seat change corresponding to the four types of seat change patterns (A → A, B → B, C → C, D → D). . The A → A seating change pattern corresponds to a change in only the A seat in the passenger compartment space 2, and the B → B seating change pattern changes only to the B seat in the passenger compartment space 2. This corresponds to the case where Furthermore, the C → C seating change pattern corresponds to a change in only the C seat in the passenger compartment space 2, and the D → D seating change pattern changes only to the D seat in the passenger compartment space 2. This corresponds to the case where

  No. The amount of change of 2 corresponds to the gain adjustment value of the individual volume adjusting unit 16 corresponding to the seat change corresponding to the four types of seating change patterns (A → B, B → A, C → D, D → C). . The A → B seating change pattern corresponds to a change in the B seat while seating the A seat, and the B → A seating change pattern is a change in the A seat while sitting in the B seat. It corresponds to. Furthermore, the seat change pattern of C → D corresponds to the case where a change occurs in the D seat while seating the C seat, and the seat change pattern of D → C is a case where the change occurs in the C seat while seating the D seat. It corresponds to.

  No. The change amount 3 corresponds to the gain adjustment value of the individual volume adjustment unit 16 corresponding to the seat change corresponding to the two types of seat change patterns (A → C, B → D). The A → C seating change pattern corresponds to a change in the C seat while the A seat is seated, and the B → D seating change pattern is a case in which the D seat changes while the B seat is seated. It corresponds to.

  No. The amount of change 4 corresponds to the gain adjustment value of the individual volume adjusting unit 16 corresponding to the seat change of the seat change corresponding to the two types of seat change patterns (A → D, B → C). Note that the A → D seating change pattern corresponds to a change in the D seat while seating the A seat, and the B → C seating change pattern is a change in the C seat while sitting in the B seat. It corresponds to.

  No. The change amount of 5 corresponds to the gain adjustment value of the individual volume adjustment unit 16 corresponding to the seat change of the seat change corresponding to the two types of seat change patterns (C → A, D → B). The C → A seating change pattern corresponds to a change in the A seat while the C seat is seated, and the D → B seating change pattern is a change in the B seat while the D seat is seated. It corresponds to.

  No. The amount of change 6 corresponds to the gain adjustment value of the individual volume adjustment unit 16 corresponding to the seat change corresponding to the two types of seat change patterns (C → B, D → A). The C → B seating change pattern corresponds to a change in the B seat while the C seat is seated, and the D → A seating change pattern is a case in which the A seat changes while the D seat is seated. It corresponds to.

  For example, when the seat change occurs in the C seat while the A seat and the B seat are seated, the seat change pattern specifying unit 28 specifies the A → C seat change pattern and the B → C seat change pattern. The volume adjustment control unit 23 corresponds to the seating change pattern A → C. 3 corresponding to the change amount of No. 3 or the seating change pattern of B → C. The change amount 4 is read from the change amount table 27. Furthermore, the volume adjustment control unit 23 is set to No. No. 3 change amount or No. 3 The change amount of 4 is set in the individual volume adjustment unit 16C corresponding to the C seat which is the seat change seat. The volume adjustment control unit 23 adjusts the volume of the individual volume adjustment unit 16C corresponding to the C seat to be controlled. Note that the volume adjustment control unit 23 is No. No. 3 change amount or No. 3 The individual volume adjustment unit 16C corresponding to the C seat to be controlled was adjusted based on one of the four change amounts. However, these No. No. 3 change and No. 3 The individual sound volume adjustment unit 16C corresponding to the C seat to be controlled may be adjusted based on the average value obtained by adding the four change amounts.

  Next, the operation of the in-vehicle acoustic device 1A according to the second embodiment will be described. FIG. 8 is a flowchart showing the processing operation of the control unit 19 related to the second volume adjustment processing. When the seating change pattern is specified, the second volume adjustment process shown in FIG. 8 is based on the amount of change corresponding to the seating change pattern so that an acoustic signal of the same volume flows at the listening point 4 of each seat 3 to be controlled. This is a process of controlling the individual volume adjusting unit 16 corresponding to the seating change seat.

  8, the seating change detection unit 41 in the control unit 19 determines whether or not a seating change has been detected based on the detection result of the seating sensor 17 of each seat 3 in the passenger compartment space 2 (step S21). . When the seat recognition unit 42 in the control unit 19 detects a seating change (Yes at Step S21), the seat recognition unit 42 recognizes the seat 3 in the passenger compartment space 2 (Step S22). When the mute seat recognizing unit 43 in the control unit 19 recognizes the seat 3 that has changed seating, the mute seat recognition unit 43 determines whether or not the seat 3 that has changed seating is a mute seat (step S23).

  The control target seat recognition unit 44 in the control unit 19 recognizes the control target seat 3 in the passenger compartment space 2 (step S24) when the seat 3 whose seat change has occurred is not a mute seat (No in step S23). The pattern specifying unit 45 in the control unit 19 specifies a seating change pattern based on the seat to be controlled (step S25).

  The volume adjustment control unit 23 in the control unit 19 reads out the change amounts (No. 1 to No. 6) corresponding to the seating change pattern from the change amount table 27 (step S26). Further, the volume adjustment control unit 23 sets a change amount corresponding to the seating change pattern in the individual volume adjustment unit 16 corresponding to the seat 3 of the seating change (step S27). Each individual volume adjuster 16 adjusts the volume of the acoustic signal based on the set amount of change (step S28). As a result, the control unit 19 causes an acoustic signal having the same volume to flow through the listening point 4 of the seat 3 to be controlled. Further, when the volume of the acoustic signal is adjusted, the control unit 19 proceeds to step S21 in order to determine whether or not a seating change has been detected.

  The seating change detection unit 41 ends this processing operation when no seating change in the passenger compartment space 2 is detected (No at Step S21). In addition, when the seat 3 whose seat change has occurred is a mute seat for which voice mute is set (Yes at Step S23), the mute seat recognition unit 43 proceeds to Step S21 in order to determine whether or not a seat change has been detected.

  In the second sound volume adjustment process shown in FIG. 8, when a seating change of the seat 3 is detected in the interior space 2, a seating change pattern is specified, a change amount corresponding to the seating change pattern is read from the change amount table 27, and the seating change is detected. The amount of change is set in the individual volume adjusting unit 16 corresponding to the seat 3 of the other. Further, in the second volume adjustment processing, the individual volume adjustment unit 16 corresponding to the seat 3 with the seating change is controlled based on the change amount, so that the seat to be controlled at the listening point 4 corresponding to the seat 3 with the seating change. The sound signal of the same volume that flows at the listening point 4 of will flow.

In the second embodiment, when the seating change pattern corresponding to the seating change of the seat 3 in the passenger compartment space 2 is specified, the change amount corresponding to the seating change pattern is read from the change amount table 27, and the read change amount is changed to the seating change. Is set in the individual volume adjusting unit 16 corresponding to the seat 3 to be controlled. Furthermore, in the second embodiment, when the amount of change is set in the individual volume adjustment unit 16 corresponding to the seat 3 to be controlled for seating change, the volume of the acoustic signal is adjusted based on the amount of change in the individual volume adjustment unit 16, and the control target The acoustic signal flowing through the listening point 4 corresponding to the seat is the same. As a result, in the second embodiment, even if a change in seating occurs, the sound signal flowing through the listening point 4 corresponding to the seat to be controlled has the same volume, so that the passenger seated in the seat 3 to be controlled has a sense of incongruity. Such a situation can also be avoided. Moreover, in the first embodiment, for example, when the number of seats 3 in the passenger compartment space 2 is 4, the gain adjustment value of each individual volume adjustment unit 16 corresponding to 2 ⁴ = 16 types of seating patterns is stored in the volume adjustment table 24. Need to hold. On the other hand, in Example 2, no. 1-No. 6, it is only necessary to hold the six kinds of change amounts in the change amount table 27, so that the table capacity for holding the gain adjustment value can be greatly reduced.

  In this embodiment, the individual volume adjusting unit 16 corresponding to the seat in the passenger compartment space 2 is controlled so that the sound signals flowing through the listening points 4 of the seat 3 to be controlled have the same volume. However, in addition to the volume adjustment of the individual volume adjustment unit 16, the frequency characteristic of the acoustic signal flowing through the listening point 4 of the controlled seat 3 is controlled by individually controlling the equalizer unit 15 corresponding to the controlled seat. You may make it do.

  In addition, each component of each part illustrated does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.

  As described above, in the on-vehicle acoustic device of the present invention, in order to provide an acoustic signal with the same volume without giving a sense of incongruity to a seated passenger according to the seating situation in the passenger compartment space, for example, to a vehicle or the like. This is useful for on-board audio devices.

DESCRIPTION OF SYMBOLS 1 In-vehicle acoustic device 1A In-vehicle acoustic device 2 Car interior space 3 Seat 4 Listening point 11 Sound source 12 Speaker 14 Sound field correction unit 15 Equalizer unit 16 Individual volume adjustment unit 17 Seat sensor 19 Control unit 23 Volume adjustment control unit 24 Volume adjustment Table 25 Seating pattern specifying part 27 Change amount table 28 Seating change pattern specifying part

Claims (8)

An acoustic output unit that is arranged for each seat in the passenger compartment space and outputs an acoustic signal from a sound source,
A volume adjusting unit that adjusts the volume of an acoustic signal transmitted to the acoustic output unit of the seat, corresponding to each seat;
Corresponding to each seat so that the volume of the acoustic signal flowing at the listening point for each seat to be controlled is the same among the plurality of seats in the passenger compartment according to the seating situation for each seat. A vehicle-mounted acoustic device comprising: a control unit that controls the volume adjustment unit. A volume adjustment table for managing volume adjustment data for controlling each volume adjustment unit so that the volume of the acoustic signal flowing at the listening point for each seat to be controlled is the same for each seating pattern corresponding to the seating situation. Have
The controller is
Volume adjustment data of each volume adjustment unit corresponding to the seating pattern corresponding to the current seating situation is read from the volume adjustment table, and the volume adjustment unit corresponding to each seat is controlled based on the read volume adjustment data. The in-vehicle acoustic device according to claim 1, wherein For each seating change pattern of a seat subject to seat change for a specific seat among a plurality of seats, the volume of the acoustic signal flowing at the listening point of the seat subject to seat change according to the seating change of the seat subject to seat change A change amount table for managing the volume adjustment data of the volume adjustment unit corresponding to the seat of the seating change target as a change amount so that the volume of the sound signal flowing at the listening point of the specific seat is the same as
The controller is
When a seating change pattern of the seat subject to seating change is detected as the seating status, a change amount corresponding to the seating change pattern is read from the change amount table, and based on the read change amount, the seating change target seat The in-vehicle acoustic device according to claim 1, wherein a corresponding volume control unit is controlled.   The in-vehicle acoustic device according to any one of claims 1 to 3, further comprising a seating detection unit that detects seating of a passenger on the seat. Corresponding to each seat, adjusting the frequency characteristic of the acoustic signal from the sound source, and having a frequency characteristic correcting unit that transmits the acoustic signal adjusted this frequency characteristic to the volume adjusting unit,
The controller is
The frequency characteristic correction unit corresponding to the seat to be controlled is controlled so that the volume of the acoustic signal flowing at the listening point for each seat to be controlled becomes the same according to the current seating situation. The on-vehicle acoustic device according to any one of claims 1 to 4. Corresponding to each seat, adjusting the sound field characteristic of the acoustic signal from the sound source, and having a sound field characteristic adjusting unit that outputs the acoustic signal adjusted this sound field characteristic,
The controller is
A sound field correction filter that widens the sound field of the sound signal from the sound source in the sound field correction unit corresponding to the control target seat when driving of the sound output unit corresponding to the seat adjacent to the control target seat stops. And set
When a sound output unit corresponding to a seat adjacent to the control target seat is driven, a sound field correction filter that reduces a sound field of an acoustic signal from the sound source is provided in a sound field correction unit corresponding to the control target seat. It sets, The vehicle-mounted audio apparatus as described in any one of Claims 1-5 characterized by the above-mentioned. The sound output unit arranged for each seat is
The in-vehicle sound according to any one of claims 1 to 6, further comprising a directivity characteristic for attenuating the sound signal so that the sound signal to be sounded does not flow into an adjacent seat-compatible listening point. apparatus. An acoustic output unit that is arranged for each seat in the passenger compartment space and outputs an acoustic signal from a sound source,
A volume adjustment method for an in-vehicle acoustic device that corresponds to each seat and has a volume adjustment unit that adjusts the volume of an acoustic signal transmitted to the sound output unit of the seat,
A seating status detection step for detecting a seating status for each seat;
According to the seating status of each seat detected in the seating status detection step, the volume of the acoustic signal flowing at the listening point for each seat to be controlled is the same among the plurality of seats in the passenger compartment space. And a control step of controlling a volume adjusting unit corresponding to each seat.

Images