Abstract:
An on-vehicle acoustic control system determines which one of sounds of an audio device and a navigation device should be generated with priority, when both devices are requested to generate respective sounds. The control system further detects a user&#39;s physical condition based on an interaction with the user, a picture of the user and biometric information of the user. The control system generates sound in the order of determined priority, and varies the manner of sound generation based on the user&#39;s physical condition.

Description:
CROSS REFERENCE TO RELATED APPLICATION  
       [0001]     This application is based on and incorporates herein by reference Japanese Patent Application No. 2004-273395 filed on Sep. 21, 2004.  
       FIELD OF THE INVENTION  
       [0002]     The present invention relates to on-vehicle acoustic control system and method that control sounds in a vehicle by using an AI agent.  
       BACKGROUND OF THE INVENTION  
       [0003]     An on-vehicle control system that controls sounds within a vehicle is disclosed, for example, in JP-7-159190A.  
         [0004]     In a vehicle interior, various sounds such as music outputted from an audio device and voice guidance such as route guide outputted from a navigation device coexist. The music and voice guidance are not outputted in a coordinated or balanced manner with each other but are outputted independently of each other. Therefore, for example, if voice guidance from the navigation device is outputted when music from the audio device is being outputted in an extremely high volume, the outputted voice guidance will be buried in the music. The user may not be able to catch the voice guidance. Since these sounds are outputted regardless of user&#39;s physical condition, the user may feel that the sound level is not appropriate or miss the voice guidance when the user is in bad physical condition.  
       SUMMARY OF THE INVENTION  
       [0005]     The present has an object to provide an on-vehicle acoustic control system and method that uses an AI agent to control sounds within a vehicle based on user&#39;s physical condition, and enable the user to comfortably catch sounds necessary to the user.  
         [0006]     According to an on-vehicle acoustic control system and method, when a command is inputted from an on-vehicle electronic control unit (ECU) or an on-vehicle system, the inputted command is analyzed and the priority of sound data is determined. When sound data is inputted from the on-vehicle ECU or the on-vehicle system, a sound corresponding to the inputted sound data is outputted based on the priority of the sound data. An artificial intelligence (AI) agent selectively executes a user mode and a vehicle mode. The user mode detects user&#39;s physical condition. The vehicle mode outputs a sound corresponding to the sound data outputted from the on-vehicle ECU or the on-vehicle system. When executing the vehicle mode, the AI agent acoustically controls a sound corresponding to sound data outputted from the on-vehicle ECU or the on-vehicle system based on the user&#39;s physical condition detected in the user mode thereby outputting the controlled sound.  
         [0007]     Thus, a sound corresponding to sound data outputted from the on-vehicle ECU or the on-vehicle system is acoustically controlled based on the user&#39;s physical condition before being output. When it is determined that the user is in bad physical condition (for example, has a symptom such as headache, stomachache, or diarrhea), to enable the user to correctly catch sounds, sounds within the vehicle can be properly controlled based on the user&#39;s physical condition by increasing the volume and slowing the pronunciation timing and pronunciation speed. Thus, the user can correctly catch sounds necessary to the user. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]     The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:  
         [0009]      FIG. 1  is a block diagram showing an on-vehicle acoustic control system according to an embodiment of the present invention;  
         [0010]      FIG. 2  is a block diagram showing an AI agent in the embodiment;  
         [0011]      FIG. 3  is a flowchart showing processing performed by the AI agent;  
         [0012]      FIG. 4  is a flowchart showing processing performed by the AI agent;  
         [0013]      FIG. 5  is a flowchart showing processing performed by the AI agent;  
         [0014]      FIG. 6  is a flowchart showing processing performed by a sound management ECU in the embodiment;  
         [0015]      FIG. 7  is an operation diagram showing a state in which commands and sound data are outputted to a sound management ECU from on-vehicle ECUs and on-vehicle systems in the embodiment;  
         [0016]      FIG. 8  is an operation diagram schematically showing a state in which voice guidance of a navigation ECU is reproduced in the embodiment; and  
         [0017]      FIG. 9  is an operation diagram schematically showing a state in which voice guidance of the navigation ECU is reproduced. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0018]     Referring first to  FIG. 1 , an on-vehicle acoustic control system  1  includes an audio ECU  2 , a navigation ECU  3 , an air-conditioner (A/C) ECU  4 , a communication ECU  5 , a travel control system  6 , an outside monitoring system  7 , an inside monitoring system  8 , a sound management ECU  9 , and an artificial intelligence (AI) agent  10 . The on-vehicle ECUs  2  to  5  and the on-vehicle systems  7  and  8  are on-vehicle devices.  
         [0019]     The audio ECU  2  outputs sound data regarding audio devices such as music CD and music MD to the sound management ECU  9 . The navigation ECU  3  outputs sound data regarding navigation such as route guidance and destination setting to the sound management ECU  9 . The air-conditioner ECU  4  outputs sound data regarding overall operations of an air-conditioner to the sound management ECU  9 . The communication ECU  5  has an interface with a cellular phone  11 , and outputs sound data regarding overall operations of the cellular phone  11  to the sound management ECU  9 . These on-vehicle ECUs  2  to  5  output a command representative of a request to output sound data to the sound management ECU  9  and waits for a message representative of the input of a response representative of permission to output sound data from the sound management ECU  9 . When the response is inputted from the sound management ECU  9 , the on-vehicle ECUs  2  to  5  output respective permitted sound data to the sound management ECU  9 .  
         [0020]     The travel control system  6  outputs sound data regarding overall travel control to the sound management ECU  9 . The outside monitoring system  7  captures vehicle outside images photographed by an outside photographing camera  12  and outside sounds collected by an outside microphone  13 . The system  7  thus monitors the vehicle outside condition based on the captured outside images and sounds. The inside monitoring system  8  captures vehicle inside images photographed by an inside photographing camera  14  and inside sounds collected by an inside microphone  15 . The system  8  thus monitors the vehicle inside condition based on the captured inside images and sounds.  
         [0021]     In this case, the inside photographing camera  14  also photographs a user in the vehicle. These on-vehicle systems  6  to  8 , like the on-vehicle ECUs  2  to  5 , output a command representative of a request to output sound data to the sound management ECU  9  and waits for a message representative of the input of a response representative of permission to output sound data from the sound management ECU  9 . When the response is inputted from the sound management ECU  9 , the on-vehicle systems  6  to  8  output respective permitted sound data to the sound management ECU  9 .  
         [0022]     When a command is inputted from any of the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , the sound management ECU  9  analyzes the inputted commands to determine the priority of sound data. Based on the determination result, the sound management ECU  9  outputs a response representative of permission to output the sound data to the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , while outputting the command data indicating that the command has been inputted, to the AI agent  10 . When sound data is inputted from any of the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , the sound management ECU  9  outputs a sound corresponding to the inputted sound data from a loudspeaker  16  based on the priority of the sound data.  
         [0023]     The AI agent  10  has the function of interacting with the user. Specifically, the AI agent  10  has an interactive control program which analyzes sounds collected by the inside microphone  15  according to the algorithm of the interactive control program. It produces an interactive sound based on the analysis result, and outputs the produced interactive sound from the loudspeaker  16  by the sound management ECU  9  to interact with the user. The AI agent  10  has the function of analyzing user&#39;s images photographed by the inside photographing camera  14  and the function of analyzing user&#39;s biometric information measured by a biometric sensor  17 .  
         [0024]     The AI agent  10  recognizes user&#39;s physical condition based on a result of interaction with the user, the user&#39;s photographic images, and the user&#39;s biometric information. It outputs from the loudspeaker  16  a sound corresponding to the sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  after acoustically controlling it based on the user&#39;s physical condition. The biometric information here refers to body temperature, blood pressure, pulse rate, heart rate, and the like. The AI agent  10  is connected to a display  18  and displays a required display screen on the display  18 .  
         [0025]     As shown in  FIG. 2 , the AI agent  10  comprises a control unit  21  that controls the operation of the AI agent  10 , a mixer  22  that mixes sound data inputted from the sound management ECU  9 , a control data memory  23  that stores control data, a user characteristic data memory  24  that stores user performance data representative of user&#39;s characteristics, a voice generation data memory  25  that stores voice generation data, a voice recognition data memory  26  that stores voice recognition data, and a voiceprint recognition data memory  27  that stores voiceprint recognition data. The data stored in these data memories  23  to  28  is used by the AI agent  10  to recognize user&#39;s physical condition based on a result of interaction with the user. In short, the AI agent  10  can recognize user&#39;s physical condition by comparing data obtained by interaction with the user, and data indicating user&#39;s good physical condition that is stored in the data memories  23  to  28 .  
         [0026]     The AI agent  10  may also be constructed integrally with the sound management ECU  9 . It may also be constructed in the form of a soft module within the inside monitoring system  8 . It may also be constructed in the form of an independent ECU. It may also be formed on a programmable device called a reconfigurable chip. The outside photographing camera  12  may includes a fisheye lens and a wide-angle lens to enable photographing in all circumferential directions outside the vehicle, or may be provided with plural cameras. Moreover, the outside microphone  13  may be provided with plural microphones so that sounds in all circumferential directions outside the vehicle can be collected.  
         [0027]     When the control system starts operation, the AI agent  10  checks the connection among the on-vehicle ECUs  2  to  5 , the on-vehicle systems  6  to  8 , and the sound management ECU  9  (step S 1 ), and determines whether the connection is normal (step S 2 ). On determining that the connection among the on-vehicle ECUs  2  to  5 , the on-vehicle systems  6  to  8 , and the sound management ECU  9  is normal (YES at step S 2 ), the AI agent  10  displays in the display  18  a normal message indicating that the connection is normal, for example, a message “The connection is normal” (step S 3 ), thereby notifying the user that the connection is normal.  
         [0028]     On the other hand, on determining that the connection among the on-vehicle ECUs  2  to  5 , the on-vehicle systems  6  to  8 , and the sound management ECU  9  is abnormal (NO at step S 2 ), the AI agent  10  displays in the display  18  an error message indicating that the connection is abnormal, for example, a message “The connection is abnormal” (step S 4 ), thereby notifying the user that the connection is abnormal.  
         [0029]     After the AI agent  10  displays in the display  18  a normal message indicating that the connection is normal, the AI agent  10  determines whether command data has been inputted from the sound management ECU  9  to determine whether a command has been outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  (step S 5 ).  
         [0030]     On detecting that a command has not been outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  (NO at step S 5 ), the AI agent  10  proceeds to user mode processing (step S 6 ) to execute a predetermined user mode. On the other hand, on detecting that a command has been outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  (YES at step S 5 ), the AI agent  10  proceeds to vehicle mode processing (step S 7 ) to execute a predetermined vehicle mode.  
         [0031]     The user mode processing (step S 6 ) is executed as shown in  FIG. 4 . When the AI agent  10  proceeds to the user mode processing, it starts a user mode timer in which a measurement time is set in advance (step S 11 ). The AI agent  10  refers to or refers to a user mode history (step S 12 ), and determines whether the pending (unfinished) processing during previous execution of the user mode exists (step S 13 ).  
         [0032]     On detecting that pending processing during previous execution of the user mode does not exist (NO at step S 13 ), the AI agent  10  starts interaction with the user by the inside microphone  15  and the loudspeaker  16  (step S 14 ), starts to photograph the user by the inside photographing camera  14  (step S 15 ), and starts to measure user&#39;s biometric information by the biometric sensor  17  (step S 16 ). The AI agent  10  analyzes a result of interaction with the user, user&#39;s photographic images, and user&#39;s biometric information until detecting that the user mode timer times up, and collects user&#39;s physical condition data numerically representing user&#39;s physical condition (step S S 17  and S 18 ).  
         [0033]     As a result of interaction with the user, the AI agent  10  determines the way of talk, intonation, accent, and the condition and pitch of voice. As user&#39;s photographic images, it determines user&#39;s facial expressions, the movement of eyes, and the movement of mouse. As user&#39;s biometric information, it determines the blood pressure, pulse rate, and heart rate of the user. By doing so, the AI agent  10  collects the user&#39;s physical condition data. That is, the AI agent  10  determines that the user is in poor physical condition (tired), for example, when user&#39;s way of talk is heavier than usual (when user&#39;s physical condition is good), when user&#39;s facial expressions are duller than usual, or when a user&#39;s blood pressure is higher than usual.  
         [0034]     The AI agent  10  may divide user&#39;s physical condition into several levels to interact with the user according to the levels. Specifically, when the user is slightly tired, the AI agent  10  interacts with the user in such a tone to heal the user. When the user is moderately tired, it interacts with the user in such a tone to awake the user. When the user is heavily tired, it interacts with the user in such a tone to inspire the user. Besides interaction with the user, the AI agent  10  may control the air-conditioner to achieve such a temperature, wind quantity, and wind direction as to make the user comfortable.  
         [0035]     On detecting that the user mode timer times up (YES at step S 18 ), the AI agent  10  terminates interaction with the user by the inside microphone  15  and the loudspeaker  16  (step S 19 ), terminates user photographing by the inside photographing camera  14  (step S 20 ), and terminates the measurement of user&#39;s biometric information by the biometric sensor  17  (step S 21 ). The AI agent  10  records a portion not processed (e.g., midway portion of interaction) in user mode history (step S 22 ), and records user&#39;s physical condition data having been collected so far (step S 23 ). On detecting that pending processing during previous execution of the user mode exists (YES at step S 13 ), the AI agent  10  completes pending processing, that is, a portion not processed during the previous execution of the user mode (step S 24 ), and performs the above-mentioned processings after step S 13 .  
         [0036]     By the above series of processings, the AI agent  10  executes the user mode if a command is not outputted in the timing that monitors whether the command is outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , analyzes a result of interaction with the user, user&#39;s photographic images, and user&#39;s biometric information, and collects user&#39;s physical condition data representative of user&#39;s physical condition.  
         [0037]     The vehicle mode processing is executed as shown in  FIG. 5 . On proceeding to the vehicle mode processing, the AI agent  10  starts the vehicle mode timer in which a measurement time is previously set (step S 31 ). The AI agent  10  refers to user&#39;s physical condition data recorded by executing the user mode (step S 32 ), and determines the volume, pronunciation timing, and pronunciation speed of a sound corresponding to sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  (step S 33 ). The AI agent  10  refers to the vehicle mode history (step S 34 ) to determine whether pending processing during previous execution of the vehicle mode exists (step S 35 ).  
         [0038]     On detecting that pending processing during previous execution of the vehicle mode does not exist (NO at step S 35 ), until detecting that the vehicle mode timer times up, the AI agent  10  acoustically controls the sound corresponding to sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  based on the previously determined volume, pronunciation timing, and pronunciation speed, and outputs the acoustically controlled sound from the loudspeaker  16  (step S S 36 , S 37 , and S 38 ).  
         [0039]     On detecting that the vehicle mode timer times up (YES at step S 38 ), the AI agent  10  records a portion not processed (midway portion of sound data) in vehicle mode history (step S 39 ). On detecting that pending processing during previous execution of the vehicle mode exists (YES at step S 35 ), the AI agent  10  processes a portion not processed during the previous execution of the vehicle mode (step S 40 ), and performs the above processing from step S 36 .  
         [0040]     By the above series of processing, the AI agent  10  executes the vehicle mode if a command is outputted in the timing that monitors whether the command is outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , and outputs a sound corresponding to the sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  from the loudspeaker  16  after acoustically controlling it based on the user&#39;s physical condition. Therefore, for example, if it is determined that the user is in bad physical condition, to enable the user to correctly catch sounds, sounds within the vehicle can be properly controlled based on the user&#39;s physical condition by increasing the volume and slowing down the pronunciation timing and pronunciation speed. Thus, the user can correctly catch sounds necessary to the user.  
         [0041]     In the above embodiment, user&#39;s physical condition is detected based on a result of interaction with the user, the user&#39;s photographic images and the user&#39;s biometric information. However, user&#39;s physical condition may not be detected based on all of these three conditions. Any one of these three conditions may be selected to detect user&#39;s physical condition.  
         [0042]     The sound management ECU  9  executes its processing as shown in  FIGS. 6 and 7 . When a command is inputted from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , the sound management ECU  9  analyzes the inputted command to determine the priority of corresponding sound data. When the sound data is inputted from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , outputs a sound corresponding to the inputted sound data from the loudspeaker  16  based on the priority of the sound data.  
         [0043]     In  FIG. 6 , the sound management ECU  9  checks the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (step S 51 ), and determines whether a change occurs in the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (step S 52 ). When the sound management ECU  9  detects that there is no change in the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (NO at step S 52 ), it notifies the AI agent  10  that there is no change in the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (step S 53 ). On the other hand, when the sound management ECU  9  detects that there is a change in the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (YES at step S 52 ), it notifies the AI agent  10  that there is a change in the connection with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (step S 54 ).  
         [0044]     The sound management ECU  9  monitors connection lines (connection ports) with the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  (step S 55 ) to determine from which of the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  the command is inputted (step S 56 ). On detecting from which of the on-vehicle ECUs  2  to  5  and the on-vehicle systems  6  to  8  the command is inputted (YES at step S 56 ), the sound management ECU  9  analyzes the inputted command (step S 57 ). The sound management ECU  9  determines the priority of the sound data (step S 58 ), determines an output order of the sound corresponding to the sound data based on the determined priority of the sound data (step S 59 ), and stores the determined output order of sound in the time line memory (step S 60 ). The time line memory represents a time-series output order of sounds corresponding to sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8 , the sounds being outputted from the loudspeaker  16 .  
         [0045]     On detecting that the output timing of the relevant sound is reached (YES at step S 61 ), the sound management ECU  9  outputs a response representative of permission to output the sound to relevant on-vehicle ECUs  2  to  5  and on-vehicle systems  6  to  8  (step S 62 ). On detecting that sound data is inputted from the relevant on-vehicle ECUs  2  to  5  and on-vehicle systems  6  to  8  (YES at step S 63 ), the sound management ECU  9  outputs a sound corresponding to the inputted sound data from the loudspeaker  16  (step S 64 ). In this case, the sound outputted from the loudspeaker  16  by the sound management ECU  9  is acoustically controlled based on the user&#39;s physical condition by the AI agent  10 .  
         [0046]     According to the above embodiment, as shown in  FIG. 7 , when a command CD( 1 ) is inputted at t 1  from the audio ECU  2 , and a command CD( 2 ) is inputted at t 2  from the navigation ECU  3 , the sound management ECU  9  compares the priority of sound data SD( 1 ) outputted from the audio ECU  2  with the priority of sound data SD( 2 ) outputted from the navigation ECU  3 . When the latter is higher than the former, the sound management ECU  9  outputs a sound corresponding to the sound data SD( 2 ) outputted from the navigation ECU  3  from the loudspeaker  16  at t 3 , then outputs a sound corresponding to the sound data SD( 1 ) outputted from the audio ECU  2  from the loudspeaker  16  at t 5 .  
         [0047]     When a command CD( 3 ) is inputted from the outside monitoring system  7  at t 4 , the sound management ECU  9  compares the priority of sound data SD( 1 ) outputted from the audio ECU  2 , the priority of sound data SD( 2 ) outputted from the navigation ECU  3 , and the priority of sound data SD( 3 ) outputted from the outside monitoring system  7 . When the priority of sound data SD( 3 ) outputted from the outside monitoring system  7  is lower than the priority of sound data SD( 2 ) outputted from the navigation ECU  3  and the priority of sound data SD( 1 ) outputted from the audio ECU  2 , the sound management ECU  9  outputs a sound corresponding to the sound data SD( 2 ) outputted from the navigation ECU  3  at t 3  from the loudspeaker  16 , outputs a sound corresponding to the sound data outputted from the audio ECU  2  at t 5  from the loudspeaker  16 , then outputs a sound corresponding to the sound data SD( 3 ) outputted by the outside monitoring system  7  at t 6  from the loudspeaker  16 . In  FIG. 7 , effect data ED( 1 ) to ED( 4 ) is data representative of the effect of the sound data SD( 1 ) to SD( 4 ).  
         [0048]      FIGS. 8 and 9 , as an example of the above processing, schematically show sound output patterns when the navigation ECU  3  reproduces voice guidance. In this example, a description will be made of the management of sound output of voice guidance reproduced in the navigation ECU  3  for each of the case ( FIG. 8 ) where the navigation ECU  3  performs it, and the case ( FIG. 9 ) where the AI agent  10  performs it.  
         [0049]     In  FIG. 8 , the navigation ECU  3  manages the sound output of voice guidance reproduced in the navigation ECU  3 . On detecting that the distance between the subject vehicle and an intersection is e.g., 1 km (a travel position of the subject vehicle is a position indicated by P in  FIG. 8 ), the navigation ECU  3  outputs a command CD representative of a request to output voice guidance to the sound management ECU  9 . On detecting that a command is outputted to the sound management ECU  9  from the navigation ECU  3 , the AI agent  10  executes the vehicle mode as described above, refers to user&#39;s physical condition data PCD, and determines the volume, pronunciation timing, and pronunciation speed of a voice guidance outputted from the navigation ECU  3 .  
         [0050]     Moreover, the AI agent  10  lowers the volume of music reproduced in the audio ECU  2 , and according to the determined volume, pronunciation timing, and pronunciation speed, reproduces and outputs, e.g., a prior notice voice message “A voice guidance is reproduced in the navigation apparatus.” by its own interactive function from the loudspeaker  16  (“a” in  FIG. 8 ), then reproduces, e.g., a voice guidance “1 kilometer from an intersection” in the navigation ECU  3  and outputs it from the loudspeaker  16  (“A” in  FIG. 8 ).  
         [0051]     Similarly, when the distance between subject vehicle and an intersection is e.g., 500 meters (a travel position of subject vehicle is a position indicated by “Q” in  FIG. 8 ), the AI agent  10  refers to user&#39;s physical condition data, and determines the volume, pronunciation timing, and pronunciation speed of a voice guidance outputted from the navigation ECU  3 . Moreover, the AI agent  10  lowers the volume of music reproduced in the audio ECU  2 , and according to the determined volume, pronunciation timing, and pronunciation speed, reproduces and outputs, e.g., a prior notice voice message “A voice guidance is reproduced in the navigation apparatus.” by its own interactive function from the loudspeaker  16  (“b” in  FIG. 8 ), then reproduces, e.g., a voice guidance “500 meters from an intersection” in the navigation ECU  3  and outputs it from the loudspeaker  16  (“B” in  FIG. 8 ).  
         [0052]     When subject vehicle gets near an intersection in which a pedestrian exists (a travel position of subject vehicle is a position indicated by “R” in  FIG. 8 ), the AI agent  10  refers to user&#39;s physical condition data, and determines the volume, pronunciation timing, and pronunciation speed of a voice guidance outputted from the navigation ECU  3 . Moreover, the AI agent  10  lowers the volume of music reproduced in the audio ECU  2 , and according to the determined volume, pronunciation timing, and pronunciation speed, reproduces, e.g., a prior notice voice message “A voice guidance is reproduced in the navigation apparatus.” by its own interactive function and outputs it from the loudspeaker  16  (“c” in  FIG. 8 ), then reproduces, e.g., a voice guidance “There is a pedestrian. Pay attention to the pedestrian.” in the navigation ECU  3  and outputs it from the loudspeaker  16  (“C” in  FIG. 8 ).  
         [0053]     Next,  FIG. 9  shows the case where the AI agent  10  manages the sound output of a voice guidance reproduced in the navigation ECU  3 . In this case, instead of reproducing a voice guidance in the navigation ECU  3 , the AI agent  10  captures voice guidance data from the navigation ECU  3  to reproduce a prior notice voice message by its own interactive function and output it from the loudspeaker  16 , then reproduces the voice guidance data by itself and outputs a voice guidance from the loudspeaker  16 .  
         [0054]     By the above series of processing, the AI agent  10  acoustically controls a voice guidance from the navigation ECU  3  based on the user&#39;s physical condition and outputs it from the loudspeaker  16 . For example, if it is determined that the user is in bad physical condition, to enable the user to correctly catch a voice guidance, the volume is increased, and the pronunciation timing and pronunciation speed are slowed. Thus, the user can correctly catch the voice guidance of the navigation ECU  3 .  
         [0055]     As described above, according to this embodiment, in the on-vehicle acoustic control system  1 , user&#39;s physical condition is determined from a result of interaction with the user (e.g., the way of talk, intonation, accent, and the condition and pitch of voice), user&#39;s photographic images (e.g., user&#39;s facial expressions, the movement of eyes, and the movement of mouse), and user&#39;s biometric information (e.g., body heat, blood pressure, pulse rate, and heart rate), and a sound corresponding to sound data outputted to the sound management ECU  9  from the on-vehicle ECUs  2  to  5  or the on-vehicle systems  6  to  8  is acoustically controlled based on the user&#39;s physical condition and outputted from the loudspeaker  16 . Therefore, for example, if it is determined that the user is in bad physical condition, to enable the user to correctly catch sounds, sounds within the vehicle can be properly controlled based on the user&#39;s physical condition by increasing the volume and slowing the pronunciation timing and pronunciation speed. Thus, the user can correctly catch sounds necessary to the user.  
         [0056]     The present invention is not limited only to the above embodiment, and may be modified.  
         [0057]     For instance, the whole system (kinds of on-vehicle ECUs and on-vehicle systems connected to the sound management ECU, the number of loudspeakers, etc.) may be different from that of the embodiment.  
         [0058]     The system may be constructed to detect road noise to perform acoustic control, taking a result of detecting road noise into account. Also, the system may be constructed to detect the type of loudspeaker to perform acoustic control, taking a result of detecting the type of loudspeaker into account.  
         [0059]     In the AI agent, a sound corresponding to sound data outputted to the sound management ECU from the on-vehicle ECUs and the on-vehicle systems may be acoustically controlled in conjunction with travel control operation. In such a construction, sounds within the vehicle can be acoustically controlled in conjunction with steering operation, brake operation, and accelerator operation.