JP5109397B2 - Musical sound generating apparatus and musical sound generating method for vehicle - Google Patents

Description

  The present invention relates to a musical tone generator for a vehicle and a musical tone generation method.

  Conventionally, the sounds generated by vehicles such as automobiles to passengers are mechanical sounds generated by vehicle mechanisms such as engines, warning sounds when the vehicle exceeds a certain speed, and when turning left and right Blinker sound, warning sound when an object that may collide approaches. Also, audio devices are generally used for passengers to listen to music CDs and radio broadcasts in the vehicle.

However, when playing a music CD (Compact Disk) using an existing audio device, the music flows regardless of the state of the vehicle and the driving operation of the passengers. It was not something to enjoy.
In other words, there has never been a comprehensive system that expresses the overall vehicle state with sound, and the driver is driving the vehicle based on vision, mechanical sounds generated by the vehicle mechanism, and alarm sounds.

Under such circumstances, as a conventional technique for controlling the sound according to the driving state of the automobile, a technique for controlling the volume of the audio device by the engine speed is disclosed (see Patent Document 1).
JP 2003-309891 A

  However, even with the above-described prior art, it is difficult to generate completely different music depending on the vehicle state because only the volume of the audio device changes according to the engine speed, and the occupant can There is a problem that it is not possible to provide music that can be enjoyed.

  The present invention has been made in view of such circumstances, and for a vehicle that can change the music to be reproduced in accordance with the change in the driving state by selecting the music data to be reproduced in accordance with the vehicle driving state. An object is to provide a musical sound generating device and a musical sound generating method.

The present invention provides music data storage means for storing music data, reproduction position determination means for determining a plurality of reproduction sections of the music data based on predetermined music element parameters of the music data, and predetermined reproduction sections. by analyzing the musical element parameter, each of the analysis means and, respectively the music element parameters of the operating state of the vehicle that stores the music element parameters of each of the playback section in the music data storage means in association with the music data Doo and playback rule data storage means stored with associated includes a music reproducing means for reproducing the music based on the music data stored in the music data storage unit, vehicle state detection for detecting a driving state of the vehicle Means and the reproduction rule data storage means, and is related to the driving state of the vehicle detected by the vehicle state detecting means. Obtains the music element parameters, the music data being selected in advance from the music data storage unit, specifies the playback sections that meet the conditions of the obtained musical element parameter, the regeneration zone to the music reproducing unit And a control means for reproducing.

  The present invention further includes environmental state detection means for detecting an environmental state of the vehicle, and the control means reproduces music data to be reproduced by the music reproduction means according to the environmental state of the vehicle detected by the environmental state detection means. Is selected from the music data storage means.

  The present invention is characterized in that the music element parameter is any one of pitch, volume, tempo and tone color, or a combination thereof.

The present invention includes a music data storage means for storing music data, a reproduction rule data storage means and is stored in associated each respective and music element parameters of the operating state of the vehicle, in the music data storage unit A musical sound generating method in a musical sound generating device for a vehicle, comprising: a music reproducing means for reproducing a music based on the stored music data; and a vehicle state detecting means for detecting a driving state of the vehicle. Based on a predetermined music element parameter, a reproduction position determining step for determining a plurality of reproduction sections of the music data, analyzing a predetermined music element parameter of the reproduction section, and determining a music element parameter for each of the reproduction sections With reference to the analysis step of storing the music data in the music data storage means in association with the music data, the reproduction rule data storage means, Obtains the music element parameters associated with the operating condition of the vehicle detected by the two-state detecting device, the music data being selected in advance from the music data storage unit, satisfy the conditions of the musical element parameters obtained It specifies to playback section, and having a control step of reproducing the reproducing section in the music reproducing unit.

  According to the present invention, the music element parameters of music data are analyzed to divide the music data into a plurality of phrases (playback sections), and the music element parameters of the divided phrases are analyzed to determine the characteristics of each phrase data. Since it is memorize | stored as the information to show and it selects and reproduces | regenerates an appropriate phrase according to the driving | running state of the detected vehicle, the autonomous reproduction | regeneration which changes a music according to a vehicle driving | running state can be performed. In addition, there is no need to prepare or prepare playback data in advance, and it is possible to autonomously play back the musical sound according to the driving state of the vehicle using the music data already owned. It is done.

  Hereinafter, a musical tone generator for a vehicle according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a control unit that controls the overall processing operation of the musical tone generator. Reference numeral 2 denotes an operation unit for a user to perform a setting operation of a musical sound generating device, an operation of obtaining new music data, and the like, and a display device is provided for performing an operation while viewing the display content of the screen as necessary. ing. Reference numeral 3 denotes a music reproducing unit that reproduces music based on music data, and causes the reproduced music to be generated from the speaker 4 as sound. The music reproducing unit 3 and the speaker 4 may use a car audio device provided in the vehicle. Reference numeral 5 denotes a communication unit that performs information communication by connecting to a music distribution server or the like using mobile communication in order to acquire music data. Reference numeral 6 denotes a CD reader for reading music data recorded on a music CD. The CD reading device 6 may use a car audio device provided in the vehicle. Reference numeral 7 denotes an interface (hereinafter referred to as I / F) for connecting the communication unit 5 and the CD reader 6 to the control unit 1.

  Reference numeral 8 denotes a music database in which music data to be reproduced by the music reproducing unit 3 is stored. Reference numeral 10 denotes a reproduction rule base in which reproduction rule information for selecting a phrase to be reproduced is stored in advance according to the driving state of the vehicle and the surrounding environmental conditions. The phrase here refers to natural musical data of a single melody obtained by dividing one piece of music data into short sections. Reference numeral 11 denotes a vehicle state detection unit that detects a driving state of the vehicle (vehicle speed, engine speed, accelerator opening, brake operation state, shift state, etc.), and includes, for example, a sensor. The vehicle state detection unit 11 may input an output of each sensor provided in advance in the vehicle in order to control the vehicle instead of newly providing a sensor. Reference numeral 12 denotes an environmental state detection unit that detects an environmental state (vehicle position, time, weather, etc.) of the vehicle, and includes, for example, a GPS (Global Positioning System), a timer, a sensor, and the like.

  Here, terms used in the following description are defined. “Pitch” refers to the pitch, and is expressed as, for example, high or low pitch. “Volume” refers to the loudness (intensity) of a sound, and for example, it is expressed that the volume is large or small. “Tempo” is a performance speed, for example, expressed as fast / slow tempo. “Tone” indicates the characteristics of a sound, and for example, it is indicated by how much an audio signal exists in a predetermined frequency band as a result of sound spectrum analysis.

  These “pitch”, “volume”, “tempo” and “tone” are called music element parameters, and each parameter is expressed by levels 1 to 3. Level 1 means that the parameter value is large, and level 3 means that the parameter value is small. Level 2 means an intermediate value between level 1 and level 3. For example, in the case of a pitch, a pitch exceeding the first threshold is set to level 1, a pitch smaller than the second threshold is set to level 3, and the first threshold and the second threshold are set. The pitch between them is level 2.

  Next, the table structure of the music database 8 shown in FIG. 1 will be described with reference to FIG. The music database 8 includes a music data table 81 for storing music data, a phrase characteristic table 82 in which characteristics of a plurality of phrases (pitch, volume, tempo, timbre) are defined for each music data, and each music data. And a phrase position table 83 in which start / end positions of a plurality of phrases are defined. In the music data table 81, a music identification name is associated with music data in a format that can be reproduced by the music reproducing unit 3, and characteristics of the entire music data are defined by four music element parameters. For example, for music data to which the music identification name “M01” is assigned, the average pitch from the beginning to the end of the music is level 1, the average volume is level 3, the average tempo is level 2, and the average tone is level 3. Is shown. That is, the music “M01” has a low pitch and a standard tempo as a whole, but has a characteristic that the volume is high. Further, the timbre level is classified according to the amount of audio signals existing in a predetermined frequency band, but indirectly indicates the type of musical instrument being played.

  In the phrase feature table 82, the song “M01” is divided into five phrases A to E, and music element parameters of each phrase are defined. For example, phrase A indicates that the average pitch in phrase A is level 2, the average volume is level 3, the average tempo is level 3, and the average tone color is level 3. Although this phrase feature table 82 is not shown in FIG. 3, tables similarly defined for the music “M02” and “M03” are related.

  In the phrase position table 83, for each of the phrases A to E, the position on the music “M01” is defined by a start position and an end position. For example, the phrase A is from the beginning of the music to the mark 1 and the phrase E is from the mark 4 to the end of the music. The marking operation for adding a mark on the music data will be described later.

  Next, the table structure of the reproduction rule base 10 shown in FIG. 1 will be described with reference to FIGS. The reproduction rule base 10 includes a music selection rule table 101 and a phrase selection rule table 102. First, the music selection rule table 101 will be described with reference to FIG. The music selection rule table 101 is an environmental state specified by weather information (flare, cloudy, candy) and time information (morning, afternoon) for each piece of information (around the sea, mountainous area, urban area, etc.) specifying the place. Music element parameters indicating the characteristics of the music to be reproduced are defined in advance. For example, if the vehicle position is around the sea, the time is in the morning, and the weather is clear, the music having the characteristics that the pitch is level 2, the volume is level 2, the tempo is level 3, and the tone is level 2 is selected. It is defined that it should be played.

  In the phrase selection rule table 102 shown in FIG. 5, the music element parameters indicating the characteristics of the phrase to be reproduced are previously stored for each driving state of the vehicle (idling, starting, constant speed cruise, acceleration, deceleration,..., Stop). Is defined. Here, each driving state is determined by a predetermined rule depending on the speed of the vehicle, the engine speed, the presence / absence of various operations, and the like. For example, when the driving state is idling, it is defined that a phrase having the characteristics that the pitch is level 1, the volume is level 2, the tempo is level 1, and the timbre is level 2 should be selected and reproduced.

  Next, the operation of the musical tone generator for a vehicle shown in FIG. 1 will be described. First, an operation for obtaining new music data will be described. The user uses the operation unit 2 to operate an instruction to import new music data. Then, the user performs an operation of inserting a music CD into the CD reader 6 and instructing to take in music data. The CD reader 6 reads music data recorded on the inserted CD and outputs it to the control unit 1 via the I / F 7. In response to this, the control unit 1 analyzes the music data output from the CD reader 6 to obtain music element parameters (pitch, volume, tempo, timbre) of the entire music, and is unique to this music data. The music identification name is given, and is written in the music data table 81 of the music database 8 together with the music data. When the music identification name can be read from the inserted CD, the read music identification name may be used.

  When acquiring music data from a music distribution server using communication, the user uses the operation unit 2 to perform an operation of instructing to acquire new music data from the distribution server. In response to this, the communication unit 5 connects to a predetermined music distribution server and downloads desired music data. The communication unit 5 outputs the downloaded music data to the control unit 1 via the I / F 7. In response to this, the control unit 1 analyzes the music data output from the communication unit 5 to obtain music element parameters (pitch, volume, tempo, timbre) of the entire music, and is given to the music data in advance. Is written together with the music data in the music data table 81 of the music database 8 using the existing music identification name. With these operations, new music data is stored in the music database 8. The header portion of the music data stored in the music data field of the music data table 81 includes information that can identify the music data format and the music genre.

  Next, with reference to FIG. 2, the operation | movement which performs the reproduction | regeneration of the phrase according to the operation | movement which provides a mark with respect to music data, and a driving | running state in the musical sound generator for vehicles shown in FIG. 1 is demonstrated. First, when the musical sound generator is turned on, the control unit 1 refers to the music database 8 to determine whether new music data has been obtained (whether there is music data to which no mark is attached). (Step S1) If new music data is obtained, a marking process is performed (Step S2). If new music data is not obtained, the process proceeds to step S4. When performing the marking process, the control unit 1 reads music data from the music data table 81 and extracts music genre information included in the music data.

  Next, the control unit 1 reads out the newly obtained music data from the music database 8 and holds it inside. And the control part 1 performs marking based on the four music element parameters of the read music data. FIG. 6 is a diagram illustrating an example of music data read from the music database 8. The control unit 1 analyzes four music element parameters such as pitch, volume, tempo, and tone color, and obtains a mark position based on a predetermined threshold value. For example, in FIG. 6, four mark positions (five phrases) of the marks 1 to 4 are obtained by comparing the rate of change in pitch, the rate of change in volume, and the like with predetermined threshold values. Further, when marking is performed, the parameters of the four music elements may be weighted, and the marking position may be determined based on the weighting. For example, for each of the marks 1 to 4 shown in FIG. 6, the mark 1 weights the volume and compares it with a threshold value, and the mark 4 weights the tempo and compares it with a threshold value. Thus, it is possible to improve the accuracy of the mark position assumed in advance for each music genre. In this way, for example, the phrase is divided into distinctive phrases such as a quiet phrase, a lively phrase, and a phrase containing a specific instrument.

  Next, the control unit 1 stores the obtained mark position in the phrase position table 83. The mark information is, for example, position information specified by the playback time from the beginning. As a result, the mark position indicating the boundary of each phrase is stored in the phrase position table 83 shown in FIG. Subsequently, after dividing the phrase into a plurality of phrases, the control unit 1 analyzes the four music element parameters for each phrase, and stores the obtained level values in the phrase feature table 82 (step S3). As a result, the music element parameters indicating the characteristics of each phrase are stored in the phrase characteristics table 82 shown in FIG. The processing (marking processing) of steps S2 and S3 shown in FIG. 2 is not necessarily performed at the same time as the musical sound reproduction processing described below, and may be performed at a timing when the music reproduction unit 3 does not reproduce the music. .

  On the other hand, when the engine is turned on, the control unit 1 reads the environmental state (vehicle position, time, weather, etc.) of the vehicle detected by the environmental state detection unit 12 and checks the detection result (step S4). Then, the control unit 1 determines whether or not the check operation in step S4 is a first environmental state check (step S5). If it is not the first check (step S5; No), it is determined whether there is a change in the environmental state from the previous check and it is necessary to change the music data (step S6).

  If it is the first check (step S5; Yes), or if the environmental condition of the vehicle has changed since the previous check and the music data needs to be changed (step S6; Yes), the control unit 1 is detected. According to the environmental state of the vehicle, the optimal music data is selected from the music database 8 and set in the music playback unit 3 (step S7), and then the process proceeds to step S8. For selection of optimum music data, first, the music selection parameter table 101 shown in FIG. 4 is referred to, and four music element parameters indicating the characteristics of the music matching the detected vehicle position, weather, and time information are read out. Then, with reference to the music data table 81, a music piece in which the same music element parameter as the music element parameter read from the music selection rule table 101 is stored or the music element parameter having the closest value is stored is selected. To do. Thereby, the optimal music according to the environmental condition of the vehicle can be selected.

  On the other hand, as a result of checking the environmental state of the vehicle, if there is no need to change the music data (step S6; No), the process proceeds to step S8.

  Next, the control unit 1 reads the vehicle driving state (vehicle speed, engine speed, accelerator opening, brake operation state, shift state, etc.) detected by the vehicle state detection unit 11 and checks the detection result (step S8). ). And the control part 1 determines whether the check of the driving | running state of the vehicle in step S8 is the first check (step S9). If it is not the first check (step S9; No), the driving state of the vehicle is checked. As a result, there is a change in the driving state of the vehicle immediately before and the driving state of the vehicle at the time of the current check. It is determined whether or not it is necessary to change (step S10).

  When it is the first check (step S9; Yes), or when the driving state of the vehicle has changed from the previous check as a result of checking the driving state of the vehicle (step S10; Yes), the control unit 1 A phrase to be reproduced is selected and determined (step S11). To select a phrase to be reproduced, first, referring to the phrase selection rule table 102 shown in FIG. 5, four music element parameters indicating the characteristics of the phrase that matches the detected driving state of the vehicle are read out. Then, referring to the phrase feature table 82, a phrase in which the same music element parameter as the music element parameter read from the phrase selection rule table 102 is stored or the music element parameter having the closest value is stored is selected. To do. Thereby, the optimal phrase according to the driving | running state of a vehicle can be selected.

  Subsequently, the control unit 1 reads from the phrase position table 83 information on the start position and the end position of the phrase to be reproduced that has been selected previously. Then, based on the information of the start position and the end position, the phrase data of the phrase to be reproduced is read from the music data table 81 and output to the music reproducing unit 3. Receiving this, the music reproducing unit 3 reproduces the phrase data output from the control unit 1, and the speaker 4 generates a music (phrase) corresponding to the driving state of the vehicle (step S12).

  On the other hand, when the driving state of the vehicle has not changed since the previous check (step S10; No), the music playback unit 3 continues the playback operation based on the phrase data played back immediately before, and the position of the end of the phrase data When the number reaches, the phrase data output from the control unit 1 is repeatedly reproduced.

  Next, the control unit 1 determines whether the power of the musical tone generator is off (step S13), and if not (step S13; No), the process proceeds to step S1. When it is OFF (step S13; Yes), the control part 1 controls the music reproduction part 3, and stops reproduction | regeneration of phrase data.

  Note that a program for causing the control unit 1 to execute the above-described processing is stored in a storage area (not shown) of the control unit 1.

  If the driving state of the vehicle has not changed for a predetermined time or longer, the phrase data to be reproduced is repeatedly reproduced for a predetermined time. If the repeated reproduction time exceeds the predetermined time, another phrase data is reproduced. It may be selected again to prevent the same phrase data from being repeatedly reproduced for a long time. Also, another piece of music data may be selected again to select new phrase data. In addition, when the vehicle is in an operating state corresponding to the initial stage of driving (driving) such as idling or starting after the engine is turned on, the first phrase (for example, intro) of the music is selected and driving (driving) such as deceleration or stopping. The last phrase (ending) of the music may be selected when the vehicle is in the driving state corresponding to the end of.

  In addition to the driving state of the vehicle stored in the phrase selection rule table 102 shown in FIG. 5, the phrase to be played when an event such as lighting of a headlamp, operation of a direction indicator, or operation of a wiper occurs. Music element parameters indicating the characteristics of the above may be stored.

  The music data may be commercially available music data such as a music CD, or music data dedicated to the musical tone generator for the vehicle in which various phrases are collected as one music data. The format of the music data is, for example, MIDI (Musical Instrument Digital Interface) standard sequence data or audio data.

  In this way, the music element parameters of the music data are analyzed and stored as information indicating the characteristics of each music data, and the music data is divided into a plurality of phrases, and the music element parameters of the divided phrases are analyzed. Because it is stored as information indicating the characteristics of each phrase data, appropriate music data is selected according to the environmental condition of the vehicle, and an appropriate phrase is selected and reproduced according to the driving state of the vehicle. Autonomous reproduction can be performed in which music is changed according to the driving state and environmental state of the vehicle. In addition, it is not necessary to prepare or prepare reproduction data in advance, and it is possible to autonomously reproduce musical sounds according to the driving state and environmental state of the vehicle using the music data already owned. For example, when acceleration is performed by depressing the accelerator, a phrase that is excited in music data is reproduced, and a calm phrase can be reproduced when cruising at a constant speed.

  Therefore, it is possible to create a world view in which passengers can enjoy driving and generating music without getting tired. In addition, since the driving state of the vehicle is always expressed as a musical piece with changes, it is possible to always know what driving state the vehicle is in. In addition, since the music generated by the musical tone generator for the vehicle can be enjoyed, the driving of the vehicle is further enhanced, and various additional information is transmitted to the occupant along with the music so that the driver can drive comfortably. Furthermore, since the music changes autonomously even when the driving state of the vehicle does not change, the passenger can appreciate the music without getting tired.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a flowchart which shows operation | movement of the apparatus shown in FIG. It is explanatory drawing which shows the table structure of the music database 8 shown in FIG. It is explanatory drawing which shows the table structure of the reproduction | regeneration rule base 10 shown in FIG. It is explanatory drawing which shows the table structure of the reproduction | regeneration rule base 10 shown in FIG. It is explanatory drawing which shows an example marked with respect to music data.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Control part, 2 ... Operation part, 3 ... Music reproduction part, 4 ... Speaker, 5 ... Communication part, 6 ... CD reader, 7 ... I / F (Interface), 8 ... music database, 10 ... reproduction rule base, 11 ... vehicle state detection unit, 12 ... environmental state detection unit

Claims (4)

Music data storage means for storing music data;
Playback position determination means for determining a plurality of playback sections of the music data based on predetermined music element parameters of the music data;
Analyzing means for analyzing predetermined music element parameters of the playback section and storing the music element parameters of each of the playback sections in the music data storage means in association with the music data;
A reproduction rule data storage means and each respective the music element parameters of the operating state of the vehicle is stored in associated,
Music playback means for playing back music based on the music data stored in the music data storage means;
Vehicle state detection means for detecting the driving state of the vehicle;
Referring to the reproduction rule data storage means, the music element parameter related to the driving state of the vehicle detected by the vehicle state detection means is obtained, and the music data previously selected from the music data storage means in specifies the playback sections that meet the conditions of the obtained musical element parameter, the vehicular tone generating apparatus characterized by comprising a control means for reproducing the reproduction section to said music reproducing means. An environmental condition detecting means for detecting an environmental condition of the vehicle;
2. The control unit according to claim 1, wherein the control unit selects music data to be played back by the music playback unit from the music data storage unit according to the environmental state of the vehicle detected by the environmental state detection unit. A musical sound generator for vehicles.   3. The musical tone generator for a vehicle according to claim 1, wherein the music element parameter is any one of pitch, volume, tempo, and timbre, or a combination thereof. A music data storage means for storing music data, a reproduction rule data storage means and is stored in associated each respective and music element parameters of the operating state of the vehicle, the stored in the music data storage unit A musical sound generating method in a musical sound generating device for a vehicle, comprising: music reproducing means for reproducing music based on music data; and vehicle state detecting means for detecting the driving state of the vehicle,
A playback position determining step for determining a plurality of playback sections of the music data based on predetermined music element parameters of the music data;
Analyzing the predetermined music element parameters of the playback section, and storing the music element parameters of each of the playback sections in the music data storage means in association with the music data;
Referring to the reproduction rule data storage means, the music element parameter related to the driving state of the vehicle detected by the vehicle state detection means is obtained, and the music data previously selected from the music data storage means in specifies the playback sections that meet the conditions of the obtained musical element parameter, the musical sound generating method characterized by a control step of reproducing the reproducing section in the music reproducing unit.

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