WO2018012587A1 - Système de pratique instrumentale musicale, procédé de pratique instrumentale musicale, dispositif de sélection de contenu, dispositif acoustique, système acoustique et procédé de sélection de contenu - Google Patents

Système de pratique instrumentale musicale, procédé de pratique instrumentale musicale, dispositif de sélection de contenu, dispositif acoustique, système acoustique et procédé de sélection de contenu Download PDF

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Publication number
WO2018012587A1
WO2018012587A1 PCT/JP2017/025544 JP2017025544W WO2018012587A1 WO 2018012587 A1 WO2018012587 A1 WO 2018012587A1 JP 2017025544 W JP2017025544 W JP 2017025544W WO 2018012587 A1 WO2018012587 A1 WO 2018012587A1
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WIPO (PCT)
Prior art keywords
practice
content
time
musical instrument
information
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PCT/JP2017/025544
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English (en)
Japanese (ja)
Inventor
旭　保彦
功紀 早渕
高橋　裕史
賢一 芝
旬 臼井
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ヤマハ株式会社
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Priority to JP2018527662A priority Critical patent/JPWO2018012587A1/ja
Publication of WO2018012587A1 publication Critical patent/WO2018012587A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B15/00—Teaching music
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments

Definitions

  • Some embodiments of the present invention relate to a musical instrument practice system, a musical instrument practice method, a content selection device, an acoustic device, an acoustic system, and a content selection method.
  • Patent Document 1 discloses a musical amusement system that can be easily enjoyed by beginners who cannot read music.
  • a user can easily enjoy a performance by pressing a key according to a note displayed while scrolling on a display.
  • the amusement system receives performance data such as audio data or MIDI (registered trademark) data transmitted from the musical instrument according to the performance of the user, emits sound, evaluates the performance content, and displays the evaluation.
  • performance data such as audio data or MIDI (registered trademark) data transmitted from the musical instrument according to the performance of the user, emits sound, evaluates the performance content, and displays the evaluation.
  • the practice time is determined depending on the length of practice content to be executed.
  • the length of various contents is determined by each content, not just practice of musical instrument practice content.
  • the user uses a limited allowable time, such as a required time from the departure point to the destination, or a free time until the next scheduled time, as the content usage time.
  • the allowable time of the user may not match the content time. For example, when the content time is longer than the allowable time, the user interrupts the use of the content on the way. On the other hand, if the content time is shorter than the allowable time, the user will waste the extra time.
  • some embodiments of the present invention aim to provide appropriate content according to the allowable time.
  • the content selection device includes an acquisition unit, a selection unit, and a playback unit.
  • the acquisition unit acquires information on allowable time.
  • the selection unit selects content to be used according to the allowable time.
  • the playback unit plays back the content selected by the selection unit.
  • Some embodiments of the present invention can provide appropriate content depending on the time allowed.
  • FIG. 1 It is a schematic diagram which shows the structure of the musical instrument practice system installed in the vehicle. It is a perspective view of the portable musical instrument used with a musical instrument practice system. It is a block diagram which shows the system configuration
  • An example of playing content is to practice playing a musical instrument.
  • the performance practice in the vehicle is preferably completed within the movement time until the vehicle arrives at the destination.
  • the user can select content to practice according to the driving environment such as road conditions, such as driving in urban areas that repeatedly start and stop or driving on suburban expressways that can maintain a substantially constant speed, the user can further Travel time can be used effectively.
  • the embodiment described below relates to a musical instrument practice system that can suitably select practice content to practice in accordance with conditions such as travel time and running environment.
  • FIG. 1 shows a system configuration when the musical instrument practice system 1 is used inside a vehicle 2.
  • the vehicle 2 is a three-row seat vehicle.
  • the vehicle 2 includes an AV control unit 3 for controlling an AV / DVD device such as a car audio, a monitor 4 for displaying AV / DVD content executed by the AV control unit 3, and a musical sound signal from the AV control unit 3 as sound.
  • a plurality of speakers 6 for conversion are provided.
  • a total of six speakers 6 are arranged at the positions of the front row seat, the middle row seat, and the rear row seat and at the respective left and right positions in the traveling direction of the vehicle 2.
  • the musical instrument practice system 1 includes a navigation device 5 that searches for a route to a destination and calculates a required time.
  • the AV control unit 3 and the navigation device 5 are connected to the portable information terminal 10 via the bus 20.
  • the performer carries out the performance practice by bringing the portable information terminal 10 and the portable musical instrument 11 into the room of the vehicle 2.
  • the portable information terminal 10 and the portable musical instrument 11 are connected by wireless communication.
  • a portable musical instrument 11 shown in FIG. 2 is a portable electronic keyboard instrument in which a keyboard 102 is arranged in a compact casing 101 and is easy to carry.
  • a remote control mode switch 103 is provided on the side of the portable musical instrument 11.
  • the remote control mode switch 103 is a switch for switching the keyboard 102 of the portable musical instrument 11 from a normal music performance operator to an operator for remote control operation. That is, the performer turns on the remote control mode switch 103 to switch to the remote control mode, whereby at least a part of the keyboard 102 of the portable musical instrument 11 is placed in the portable information terminal 10 or the AV control unit 3 installed in the vehicle 2. It can be used as a remote control button for electronic devices such as the monitor 4 and the like.
  • the performer can control the portable information terminal 10 and the devices in the vehicle 2 from the portable musical instrument 11 in the vehicle 2. Since the portable musical instrument 11 is a portable device, the performer can sit and play on any of the three rows of seats in the vehicle 2. For example, as shown in FIG. 1, when sitting on the rear row seat, the distance to the electronic devices such as the AV control unit 3 and the monitor 4 installed in the vehicle 2 may be long. In this case, the performer turns on the remote control mode switch 103, so that the performer remains in the sitting position regardless of the seat in the vehicle 2, and the pitch level or pitch output from the speaker 6 is maintained. Various adjustments such as balance can be performed.
  • FIG. 3 is a block diagram showing the system configuration of the musical instrument practice system 1.
  • the musical instrument practice system 1 includes a portable musical instrument 11 on which a performer performs, and an information portable terminal 10 that receives MIDI (registered trademark) data as performance data by wireless communication with the portable musical instrument 11.
  • the portable information terminal 10 includes a communication unit 12 that receives MIDI (registered trademark) data from the portable musical instrument 11, and a MIDI (registered trademark) interface (hereinafter referred to as MIDI (registered trademark) interface) that converts the received MIDI (registered trademark) data into audio data.
  • MIDI registered trademark
  • the vehicle 2 includes a navigation device 5 that searches for a route to the destination and calculates a recommended route and a required time to the destination.
  • the navigation device 5 is connected to the bus 20 and transmits the calculated required time to the destination to the CPU 14. Further, a musical sound signal emitted from the sound source 19 is transmitted to the AV control unit 3 via the bus 20, and the AV control unit 3 emits sound from the speaker 6.
  • the network I / F 18 accesses a data site 33 in which a plurality of practice contents are stored via an external network 31 such as the Internet. Based on the required time from the navigation device 5 to the destination, the CPU 14 finishes the practice within the required time from a plurality of practice contents stored in the data site 33, and selects content that satisfies other conditions. Select to request download.
  • the downloaded practice content is stored in the RAM 16 or an external storage device such as a memory card or ROM cartridge (not shown).
  • the CPU 14 When the CPU 14 receives an instruction to start practice (S1), the required time from the navigation device 5 to the destination is acquired (S3). Based on the acquired required time, the CPU 14 searches for a practice content that can be practiced within the required time from a database of content information related to a plurality of practice contents stored in the data site 33 (described later in FIG. 5). A candidate content is selected (S5). In this case, a plurality of candidates are selected depending on the required time related to the content information stored in the database, or depending on information other than the required time.
  • the content information database shown in FIG. 5 will be described.
  • content information about a plurality of practice contents that can be executed in the musical instrument practice system 1 is stored in a database for each music genre.
  • the items of ⁇ content title >>, ⁇ practice difficulty >>, ⁇ type of practice form >>, ⁇ time required for practice >>, and ⁇ practice history >> are stored in a database.
  • ⁇ Content title >> is named in relation to the practice content, such as "Intensive practice for specific measures” in addition to the song title.
  • Practice difficulty is information classified according to the difficulty of performance. For example, “difficult” is set for songs that require transcendental skill, and “easy” is set for basic key pressing practice.
  • Types related to practice types» are a type of practice (indicated as “L” in Fig. 4) in which basic knowledge and precautions are taught in a lecture style, and a type of practice in which a musical instrument is used for practical training ( The information is classified as “P” in FIG. 4.
  • Practice time is information related to the time required for the practice program.
  • ⁇ Practice History >> is information that stores a user's practice history, and records the number of exercises, performance proficiency, and other comments from the player.
  • the selection of candidate practice content in step S5 is, for example, as follows. First, refer to ⁇ Time required for practice >>.
  • the titles “BBB” and “DDD” are practice contents suitable for a long time that require one or more hours of practice.
  • the titles “AAA” and “CCC” are practice contents suitable for a short time, which is a practice time of less than one hour.
  • the CPU 14 selects the titles “BBB” and “DDD” as candidates when the required time from the navigation device 5 to the destination is a long time of 1 hour or more, and the short time is less than 1 hour. Selects the titles “AAA” and “CCC” as candidates.
  • the CPU 14 determines whether or not there are a plurality of contents selected as candidates (S7).
  • the CPU 14 selects the candidate practice content as the content related to the performance practice (S11), and ends the selection process.
  • the performance practice is performed by executing one practice content.
  • the CPU 14 performs a narrowing process on the candidate practice contents (S9).
  • the narrowing-down process includes the process exemplified below.
  • the first example of the narrowing-down process is to select content closest to the time required for the practice time to reach the destination from among a plurality of practice contents selected as candidates.
  • the CPU 14 narrows down the practice content that is the subject of the performance practice to one, selects it as the content related to the performance practice in step S11 (S11), and ends the selection process.
  • the second example of the narrowing-down process is to determine the practice order based on the combination of practice time.
  • the “time required for practice” is confirmed from the content information related to the plurality of candidate practice contents, and the time required to reach the destination Select a combination of practice content that fits in.
  • the second example of the narrowing-down process is to combine practice content that is a long practice time, when combining practice content that is a short practice time, and practice content that is a long practice time and a short time.
  • the combination of the practice content that is the practice time is appropriately combined, and the combination in which the sum of the practice time is closest to the required time to the destination is selected to determine the practice order.
  • practice contents are sequentially selected according to the practice order determined in step S11, and the selection process ends.
  • the third example of the narrowing-down process is to determine the practice order based on other indicators in the database of FIG.
  • the practice content to be selected can be changed according to environmental conditions such as road conditions. That is, in the third example of the narrowing-down process, when an urban driving that repeats start and stop is scheduled with «practice difficulty» as an index, the practice content with the “easy” setting is preferentially selected, When traveling on a highway in a suburb where a substantially constant speed can be maintained is planned, practice content set to “difficult” may be selected with priority.
  • the urban driving that repeats start and stop is scheduled with «type of practice type» as an index
  • priority is given to practice content set to "L" to practice in classroom If the vehicle is scheduled to travel on a suburban highway that can maintain a substantially constant speed, the “P” setting practice content for playing a musical instrument may be preferentially selected.
  • the urban driving that repeats starting and stopping is scheduled with «practice history» as an index, it is recorded that the number of exercises is many and the proficiency level is high. Priority is given to practice content, and if it is planned to drive on a suburban expressway where a substantially constant speed can be maintained, priority should be given to practice content that is recorded as less practice and less proficient. You may choose.
  • the portable information terminal 10 is an example of a performance practice execution device
  • the portable musical instrument 11 is an example of a musical instrument.
  • the CPU 14 is an example of a content selection unit.
  • the practice content in which the CPU 14 completes the practice within the required time to the destination set by the navigation device 5 when performing the practice using the practice content is selected.
  • the musical instrument practice system 1 can select practice content for which the practice ends within the time set as the required time, and suppresses a situation in which the user cannot finish the practice content within the practice time. it can.
  • the user can execute the practice content with the continuous time corresponding to the required time, and can perform the performance practice by effectively using the required time.
  • the present application is not limited to this.
  • the practice time can also be set by directly inputting to the information portable terminal 10.
  • schedule information is managed in the information portable terminal 10.
  • the information portable terminal 10 obtains a free time until the next schedule of the user based on the schedule information. This free time is an example of the allowable time for the user.
  • the information portable terminal 10 realizes an acquisition unit that acquires information on allowable time, a selection unit that selects content to be used according to the allowable time, and a reproduction unit that reproduces the content selected by the selection unit.
  • the content selection device is not limited to the information portable terminal 10.
  • the AV control unit 3 is also an example of a content selection device.
  • FIG. 6 is a block diagram showing the configuration of the AV control unit 3 when functioning as a content selection device.
  • the AV control unit 3 includes a communication unit 120, a MIDI (registered trademark) _I / F 130, a CPU 140, a ROM 115, a RAM 160, a DSP 170, an input I / F 180, a sound source 190, a bus 200, a mixer 210, and an output I / F 220.
  • MIDI registered trademark
  • the communication unit 120 MIDI (registered trademark) _I / F 130, CPU 140, ROM 115, RAM 160, DSP 170, input I / F 180, sound source 190, mixer 210, and output I / F 220 are connected via the bus 200.
  • the input terminal 50 is connected to the input I / F 180.
  • a monitor 4 and a speaker 6 are connected to the output I / F 220.
  • the input terminal 50 is an input unit for inputting an audio signal. For example, a total of six terminals are arranged at the positions of the front row seat, the middle row seat, and the rear row seat and in the left and right positions in the traveling direction of the vehicle 2. .
  • the input terminal 50 is composed of, for example, a USB interface.
  • the input terminal 50 is connected to an audio device such as the portable information terminal 10 or the portable musical instrument 11 that outputs an audio signal.
  • the input terminal 50 is connected to an output terminal provided in various audio devices, and inputs an audio signal.
  • MIDI (registered trademark) _I / F 130 is connected to the portable musical instrument 11 and receives MIDI (registered trademark) data.
  • MIDI (registered trademark) data is input to the sound source 190.
  • the sound source 190 converts the input MIDI (registered trademark) data into audio data.
  • the CPU 140 reads a program stored in the ROM 115 which is a storage medium into the RAM 160 and controls the AV control unit 3 in an integrated manner.
  • the CPU 140 inputs the audio signal output from the sound source 190 to the mixer 210. Further, the CPU 140 inputs the audio signal input from the input I / F 180 to the mixer 210.
  • the mixer 210 mixes the audio signal output from the sound source 190 and the audio signal input from the input I / F 180. Thereby, the user can enjoy karaoke by connecting a microphone to the input terminal 50 and playing back music content as content, for example.
  • the CPU 140 inputs the audio signal mixed by the mixer 210 to the DSP 170.
  • the DSP 170 adjusts the volume or sound quality of the input audio signal. The sound quality adjustment is, for example, adjustment of frequency characteristics.
  • the DSP 170 amplifies the audio signal after adjusting the sound quality and outputs the amplified audio signal to the output I / F 220.
  • the CPU 140 controls the DSP 170 and the output I / F 220 to individually control the volume and sound quality of the plurality of audio signals supplied to the plurality of speakers 6.
  • the CPU 140 obtains information on the allowable time such as the required time to the destination calculated from the navigation device 5 or the free time until the next schedule of the user received from the information processing terminal such as a smartphone. Thereby, CPU140 functions as an acquisition part.
  • the CPU 140 selects a content that can be finished within an allowable time from a plurality of practice contents stored in the data site 33 connected via the ROM 115, the sound source 190, or the communication unit 120. Thereby, CPU140 functions as a selection part. Then, the CPU 140 acquires the selected content from the ROM 115, the sound source 190, the data site 33, or the like and reproduces it. In this way, the CPU 140 also functions as a playback unit.
  • Content is not limited to musical instrument practice content.
  • movies, music, karaoke songs, games, learning materials, etc. are examples of content.
  • the CPU 140 selects one or more karaoke songs that can be sung within an allowable time.
  • FIG. 7 is a flowchart showing a content selection operation including content other than practice content.
  • the CPU 140 receives an instruction to start using the content (S21)
  • the CPU 140 acquires information on allowable time from various devices such as the navigation device 5 or the information portable terminal 10 (S22).
  • the CPU 14 searches for available content within the allowable time based on the acquired allowable time, and selects candidate content (S23).
  • the content database is the same as the example shown in FIG. However, information such as ⁇ difficulty >> and ⁇ type >> is not included in the case of content that can only be viewed, such as movie or music content.
  • the CPU 140 determines whether there are a plurality of contents selected as candidates (S24). If there is only one candidate content (S24: N), the CPU 140 (or CPU 14) selects the candidate content as the content to be played back (S26), and ends the selection process. In this case, one content is reproduced.
  • the CPU 14 performs a narrowing process on the candidate contents (S25).
  • the narrowing-down process is performed using various methods such as the first example, the second example, or the third example described above.
  • the CPU 140 (or CPU 14) selects the narrowed content (S26) and ends the selection process.
  • the CPU 140 may select content according to environmental information such as current weather, current position, or user fatigue. For example, if the current weather is rain, the CPU 140 (or CPU 14) selects a karaoke song whose lyrics include “rain”. Alternatively, the CPU 140 (or the CPU 14) selects a karaoke song including a place name related to the current position. Information on the current weather is downloaded from the Internet via the communication unit 120 (communication unit 12 or network I / F 18). The current position is acquired from a position detection sensor such as GPS (not shown). Moreover, a user's fatigue degree is estimated from the elapsed time from departure time to the present time, for example.
  • environmental information such as current weather, current position, or user fatigue. For example, if the current weather is rain, the CPU 140 (or CPU 14) selects a karaoke song whose lyrics include “rain”. Alternatively, the CPU 140 (or the CPU 14) selects a karaoke song including a place name related to the current position.
  • the CPU 140 acquires the fatigue level “low” when the elapsed time is less than 1 hour, the fatigue level “medium” when 1 hour has passed, and the information “high” when 2 hours have passed. To do. Or when information portable terminal 10 is equipped with living body sensors, such as a sensor which measures a pulse rate, information on fatigue is acquired based on these living body information. For example, when the degree of fatigue is high, the CPU 140 (or the CPU 14) selects music content that recovers fatigue such as a sound of a wave or a stream of a stream.
  • the difficulty level may be selected according to the environmental information.
  • items of “content title”, “practice difficulty”, “type of practice form”, “time required for practice”, and “practice history” are shown as examples of the practice content of the instrument. These items can also be stored in a database for karaoke songs, games, or learning materials.
  • CPU 140 or CPU 14
  • CPU 140 for example, in the case of a scheduled city run that repeatedly starts and stops, gives priority to selecting “Easy” practice content and can maintain a substantially constant speed on a suburban highway. When traveling is scheduled, practice content with the “difficult” setting is preferentially selected.
  • the CPU 140 may further acquire the proficiency level of the user and select the difficulty level of the content based on the proficiency level.
  • the difficulty level of the content is selected according to the score in the game.
  • the content is a karaoke song
  • the difficulty level of the content is selected according to the singing score result.
  • the CPU 140 stores these scoring results in the ROM 115 (or ROM 15) as ⁇ practice history >>.
  • the CPU 140 (or the CPU 14) may adjust the content usage time in accordance with ⁇ practice history >>. For example, the CPU 140 (or the CPU 14) ends the reproduction of the content at a point of time when the scoring result up to the middle is higher than a predetermined score for content having a high skill level and a high score such as a scoring result. .
  • the vehicle can be similarly applied to transportation such as railroads, ships, and airplanes, and can be applied regardless of inside or outside a room such as a living room or a park that is not a moving space.
  • the data site 33 in the network 31 is described as an example of a place where a plurality of contents are stored and a database of content information is provided.
  • the content may be stored in the ROM 15 of the portable information terminal 10 and the ROM 115 of the AV control unit 3.
  • the content may be stored in an external storage device connected to the portable information terminal 10 or the AV control unit 3 such as a memory card or a ROM cartridge.
  • the content information stored in the database is exemplified by «content title», «practice difficulty», «practice type», «practice time», and «practice history».
  • Indicators such as practice priority or user preference can also be set as database items.
  • the “difficulty of practice” setting “difficult” / “easy” or the “type of practice type” “L” / “P” setting, etc. have been described with alternative indicators. It is not limited to. It is also possible to classify according to three or more options.
  • the music genre can be used as an index for selecting practice content. It would be convenient if the content such as the music genre to be practiced could be switched according to environmental information such as the degree of fatigue of the occupant or the scene outside the vehicle.
  • the content information (FIG. 5) stored in the database may include ⁇ instrument type information >> indicating the instrument type.
  • the musical instrument type is matched with the index of the “musical instrument type information” of the content information in response to the player specifying the type of musical instrument to practice. It is also possible to select practice content that conforms to.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Acoustics & Sound (AREA)
  • Business, Economics & Management (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electrophonic Musical Instruments (AREA)
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Abstract

La présente invention concerne un dispositif de sélection de contenu qui comporte une unité d'acquisition, une unité de sélection, et une unité de lecture. L'unité d'acquisition acquiert des informations concernant le temps imparti. L'unité de sélection sélectionne le contenu à utiliser en fonction du temps imparti susmentionné. L'unité de lecture lit le contenu sélectionné par l'unité de sélection.
PCT/JP2017/025544 2016-07-13 2017-07-13 Système de pratique instrumentale musicale, procédé de pratique instrumentale musicale, dispositif de sélection de contenu, dispositif acoustique, système acoustique et procédé de sélection de contenu WO2018012587A1 (fr)

Priority Applications (1)

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JP2018527662A JPWO2018012587A1 (ja) 2016-07-13 2017-07-13 楽器練習システム、楽器練習方法、コンテンツ選択装置、音響機器、音響システム、およびコンテンツ選択方法

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JP2016138380 2016-07-13
JP2016-138380 2016-07-13

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10187022A (ja) * 1996-10-18 1998-07-14 Yamaha Corp 音楽教習システム、音楽教習方法、及び同方法を実現するためのプログラムを記録した記録媒体
JP2004101248A (ja) * 2002-09-05 2004-04-02 Toshiba Corp 移動体用コンテンツ提供システム
JP2004117892A (ja) * 2002-09-26 2004-04-15 Clarion Co Ltd 携帯カラオケ用アダプタ
JP2005037142A (ja) * 2003-07-15 2005-02-10 Alpine Electronics Inc 車載システム
JP2006171255A (ja) * 2004-12-15 2006-06-29 Casio Comput Co Ltd 演奏支援装置および演奏支援処理のプログラム
JP2008203338A (ja) * 2007-02-16 2008-09-04 Yamaha Corp 楽音発生装置及び楽音発生方法
US20140260900A1 (en) * 2013-03-15 2014-09-18 Miselu Inc Persistent Instrument

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10187022A (ja) * 1996-10-18 1998-07-14 Yamaha Corp 音楽教習システム、音楽教習方法、及び同方法を実現するためのプログラムを記録した記録媒体
JP2004101248A (ja) * 2002-09-05 2004-04-02 Toshiba Corp 移動体用コンテンツ提供システム
JP2004117892A (ja) * 2002-09-26 2004-04-15 Clarion Co Ltd 携帯カラオケ用アダプタ
JP2005037142A (ja) * 2003-07-15 2005-02-10 Alpine Electronics Inc 車載システム
JP2006171255A (ja) * 2004-12-15 2006-06-29 Casio Comput Co Ltd 演奏支援装置および演奏支援処理のプログラム
JP2008203338A (ja) * 2007-02-16 2008-09-04 Yamaha Corp 楽音発生装置及び楽音発生方法
US20140260900A1 (en) * 2013-03-15 2014-09-18 Miselu Inc Persistent Instrument

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