JP2011118218A - Automatic arrangement system and automatic arrangement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange an input music piece into a music piece having an atmosphere of ethnic music. <P>SOLUTION: When arranging a music piece composed by the first mode into an ethnic music style music piece, the beat, mode and waveform characteristic of output sound or the like are previously stored for each music category, and a selection of the music category for arrangement is received from a user in this state. Then, the beat, mode and waveform characteristic of output sound corresponding to the selected music category are read out, and the beat, melody and waveform characteristic of timbre of an original music piece are changed and the sound is output from a sound source. When changing the beat, an increase or decrease processing of sound is executed. When changing a melody, a sound pitch is shifted to that of the mode belonging to the music category. Also, when changing the timbre, a ratio of ADSR is changed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an automatic arrangement system capable of automatically arranging input music, and more particularly to an automatic arrangement system capable of arranging input music so as to have an ethical atmosphere. It is.

  2. Description of the Related Art Conventionally, various devices have been proposed that can play or output a song as folk music.

  For example, the following Patent Document 1 proposes an electronic musical instrument in which an output sound from a keyboard is brought close to a scale of folk music of various countries as an electronic musical instrument having an all-piano keyboard. Yes. This electronic musical instrument is equipped with a folk music scale adjuster, a folk music tone adjuster, and a folk music keyboard. The scale of the accepted folk music is adjusted, and at that time, the output sound of the keyboard can be modified to the tone of the folk music. If such an electronic musical instrument is used, the national music of the country can be played using the keyboard.

  Patent Document 2 below proposes a musical score generating apparatus that converts a musical composition composed of twelve equal temperament expressed in a staff notation into a note for scissors and outputs it as a musical score. This musical score generation device is designed to convert the pitch of a musical piece according to the twelve equal temperament (that is, the pitch defined by the frequency) into a musical note having a pitch that can be played with a kite. A certain sound is processed by half-tone up, half-tone down, full-tone up, full-tone down, and the like, so that it can be output from the printer device as a score. If you use such a score generator, you can simply input the music you want to play and output the score in the form of notes that can be played on that instrument. There is a merit that you can.

Japanese Patent Laid-Open No. 06-043874 JP 2008-257068 A

  In recent years, with the spread of portable electronic music players, personal computers, and the like, there is a demand for music that is stored in a device at hand to be arranged as folk music and listen freely.

  However, in the case of outputting folk music using the electronic musical instrument described in Patent Document 1, the music stored in the device at hand is listened and scored, and the music is played and played by an electronic music player or personal computer. It must be stored in a computer. However, in order to record and perform music in this way, it is necessary to acquire absolute pitch and playing skills of the instrument, and amateurs cannot easily play and listen to the folk music. Also, even if the song can be played as folk music, the time signature and tempo are specific to the ethnicity, so if you use the time signature of the source song as it is, the nuances of that folk music will be increased. I can't put it out.

  In addition, since the apparatus of Patent Document 2 only converts a musical piece expressed by the twelve equal temperament into a note that can be played with a scissors, the score printed by the printer device is used as in Patent Document 1. You need to play the instrument yourself. Also, even if you ask an automatic or professional musician to play the song, simply replacing it with a melody suitable for the folk instrument will leave the tone and time signature unchanged. , Can not create an atmosphere as folk music.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic arrangement system that can arrange input music into music that matches the atmosphere of music belonging to a predetermined music category such as ethnic music.

  That is, in order to solve the above-mentioned problem, the present invention arranges the first musical piece created by the first melodic method in advance in the storage means for each music category, the time signature, the melodic method, the waveform characteristics of the output sound, etc. In this state, the user selects a music category to be arranged. Then, the time signature, melody, and waveform characteristics of the output sound corresponding to the selected music category are read out, and the time signature, melody, and tone characteristics of the first song can be changed and output from the sound source. It is.

  In this way, since the time signature, the melody, and the timbre are all changed to those close to the music category, the music can be output closer to the music category of the music category to be arranged.

  In such an invention, when changing the time signature, the time signature is changed by removing the sound within a predetermined beat.

  In this way, the time signature can be changed without harming the basic melody flow. At this time, it is preferable to change the time signature by removing a low importance sound such as a progress sound, a low sound volume, or a short sound.

  When changing the time signature, the time length may be changed to change the time signature.

  Even in this case, the time signature can be changed basically without harming the flow of the melody. At this time, when the time signature is increased, the important sound is extended within the measure, and when the time signature is decreased, the unimportant sound is preferably shortened within the measure.

  Further, when changing the melody, the melody used in the music category to be changed is stored in advance, and the process of raising or lowering the sound is performed according to the pitch before and after the sound to be changed.

  Alternatively, when changing the melody, memorize the melody used in the music category to be changed in advance, and perform the sound up and down processing according to the volume before and after the sound to be changed it can.

  If it does in this way, it will become possible to edit into the music which has a natural melody according to the change of a pitch, or the flow of a volume.

  When performing such an arrangement process, first, after changing the time signature and performing a sound increase / decrease process, the volume of the sound within the time signature is changed.

  If it does in this way, a sound can be output with the intensity | strength according to each time signature, and it becomes possible to arrange into the music which has the natural flow corresponding to a time signature.

  According to the present invention, the time signature and melody corresponding to the selected music category, and the waveform characteristics of the output sound are read, and the time signature and melody of the first music, and the waveform characteristics of the tone are changed. It becomes possible to output closer to the music of the music category that you want to arrange.

The figure which shows the automatic arrangement system in one embodiment of this invention Functional block diagram of automatic arrangement system in the same form The figure which shows the structure of the MIDI file in the same form The figure which shows the input screen of the music category in the same form Table showing melody change processing in the same form The figure which shows the time signature change process in the same form The figure which shows ADSR in the same form The figure which performed waveform processing using ADSR in the same form The figure which shows the flowchart of the arrangement process in the same form

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the automatic arrangement system 1 according to the present embodiment arranges a client terminal device 2 that accepts input of music to be arranged, arranges the music inputted by the terminal device 2, and And a server computer 3 for outputting to the terminal device 2. Here, the “terminal device” is a device provided with a sound source that can output music based on a MIDI file, and is constituted by, for example, a portable electronic music player, a personal computer, an electronic musical instrument, or the like. The server computer 3 is connected to the terminal device 2 via a network 4 such as the Internet, and has a function of arranging music input by a user. In this embodiment, the server computer 3 will be described using a computer connected via the network 4. However, the means for realizing each mechanism may be distributed and configured by a plurality of computers. Or you may comprise with one computer. Alternatively, the function of the server computer 3 may be incorporated in the terminal device 2 on the client side so as to arrange music as one automatic arrangement system 1. In this case, the terminal device 2 is the automatic arrangement system 1 in relation to the present invention.

  The outline of the automatic arrangement system 1 in this embodiment will be described. As shown in FIG. 2, the automatic arrangement system 1 includes, in the client side terminal device 2, music input receiving means 21 that receives input of music to be arranged from the user, and what kind of ethnic music style the music is received. Selection receiving means 22 for receiving selection of whether or not to arrange. The music input accepting means 21 accepts input of a MIDI file stored in the terminal device 2 of the client by accepting pressing of the “original music” button shown in FIG. Send to computer 3. Also, at this time, an instruction input indicating what music category the music should be arranged into is received via the selection receiving means 22, and information on the music category is also transmitted to the server computer 3 via the transmission / reception means 23. To do.

  On the server computer 3 side receiving these pieces of information, the time signature (for example, 4 time signature, 3 time signature, etc.), or what kind of time the music is composed from the transmitted MIDI file. Judge whether it is composed of melody, and change to a time signature or melody that fits the selected music category. Then, along with the changed time signature and melody, information for changing the waveform characteristics of the output sound is also transmitted to the terminal device 2 so as to make the music in a tone suitable for the atmosphere of the music category. Then, on the terminal device 2 side, the arranged music is output based on the MIDI file.

  Here, “melody” is generally called a melody, and refers to the flow of sound that is formed as one musical unit, and “melody” is the basis of the melody. This is the scale that is used, and how to make a melody based on that scale. As for this melody, there are, for example, Western Greek music, Church melody, Ionian, Lydian, Mixoridian, Dorian, Aeolian, Frisian, Lokrian, and other Asian music. There are various methods such as Gagaku's key, Luo method, Rhythm method, Positive method, Hidden method, Chinese method, Javanese music lalas and putt. In addition, there are various other methods such as the Middle Eastern method and artificially created methods. For example, there are a wide variety of Western music methods composed of twelve semitones, such as the pentatone and the seventh. It may be expressed in the scale of

  A computer constituting these automatic arrangement systems 1 cooperates with a storage device such as a CPU, a ROM and a RAM, a reading device that reads a storage medium such as a CD, a display device such as a display, an input device such as a keyboard, and the like. Each function shown in FIG. 2 is realized in accordance with a program stored in a storage medium or the like. Hereinafter, each function realization means will be described in detail.

  First, the music input accepting means 21 shown in FIG. 2 accepts the selection input of the music of the MIDI file stored in the client terminal device 2. This MIDI file has a data structure having pitch, strength and tone color, and the most common SMF (Standard MIDI File) has a data structure as shown in FIG. This SMF MIDI file is composed of a header chunk and one or a plurality of track chunks. Among these, only one header chunk is described in one SMF, a character string indicating the header, a format and the number of track chunks, The time base is described. In the header chunk shown in FIG. 3, “00 00 00 06” is a fixed part, the next “00 01” is information indicating format 1, “00 01” is the number of tracks, and “01 E0” is the time base. Become. This time base is a numerical value that serves as a reference when describing the delta time. When the value expressed in hexadecimal is converted to decimal, it becomes “480”, which is the resolution of a quarter note. That is, “480” is expressed as a quarter note, “240” as an eighth note, and “960” as a half note.

  A track chunk describes actual performance data and describes a MIDI event. This MIDI event includes a delta time, which is a waiting time until a command signal is transmitted, a note-on command for instructing sound output, a note number for instructing an output pitch, and sound intensity. A velocity for indicating, a note-off command for erasing the output sound, and the like are described. Taking the data “8F 00 90 3D 40 83 60 80 3D 00” shown in FIG. 3 as an example, the beginning “8F 00” expressed in hexadecimal is a description of delta time. When this is expressed in decimal numbers, it becomes “1920” (= 480 × 4). That is, a quarter note waits for four bars. The next “90 3D 40” means note-on command, pitch, and volume (velocity). Here, note numbers are assigned numbers from 0 to 127 in semitone steps as the maximum numerical value represented by 7 bits, and are expressed as 21 to 108 in order from the low range when expressed in the 88-key piano range. . At this time, the central door on the piano keyboard is represented by a hexadecimal number “3C” (decimal number 60). Since the note number is “3D” here, the actual pitch is “do #”. The next variable length numerical expression “83 60” is delta time, which is expressed as decimal number “480”, so it waits for the length of a quarter note. The next “80 3D 00” means note-off command, height, and volume in order from the front. Hereinafter, similarly, output of sound, duration of sound, erasure of sound, and duration of mute are repeated and described as a track chunk.

  The music described in such a MIDI file is selected via input means such as a keyboard and a mouse, and transmitted to the server computer 3 via the transmission / reception means 23.

  The selection accepting means 22 on the terminal device 2 side accepts a selection input for converting the inputted music into what music category it belongs to. When accepting this music category selection input, the terminal device 2 is connected to the server computer 3 and a list of selectable music categories is received from the server computer 3. At this time, in the terminal device 2 that has received the list, for example, an input screen of music categories divided into a grid as shown in FIG. 4 is displayed, and selection of the type of folk music can be accepted on the screen. To do. Here, the “music category” means a type of music that is classified mainly by a difference in melody, a type of music played by a folk instrument, and the like. This received music category is similarly transmitted to the server computer 3 via the transmission / reception means 23 of the terminal device 2.

  On the server computer 3 side, in response to this, the storage means 31 stores the time signature and the melody for converting the music for each music category, the frequency characteristics of the sound corresponding to the tone, the tone, whether or not the vibrato is used, and the tempo. The time signature, the melody, and the frequency characteristics of the sound belonging to the music category received from the terminal device 2 are extracted. With respect to this time signature, for example, a time signature such as 4/4 time or 6/8 time is stored in Celtic music, and a time signature such as 7 time, 8 time, 10 time, 12 time, 16 time is stored in Indian music. Also, for Japanese folk songs, two beats are memorized. Then, an arbitrary time signature is extracted from these time signatures, or a time signature that satisfies a predetermined condition is extracted. On the other hand, regarding the melody, a table for converting these pitches is prepared assuming that the input music is a music composed of 12 chromatic scales.

  For example, in Mixolidia, which is a celtic music melody, as shown in FIG. 5, seven sounds “C, D, E, F, G, A, A #” are used, and C #, D #, F #, For each sound of G # and B, the process of raising the semitone or lowering the semitone is performed. When performing the process of raising the semitone or lowering the semitone, the process is performed so that the used sound and the adjacent sound are not extremely opened. In addition, when performing the semitone raising or semitone lowering process, it may be performed according to a melody pattern.For example, in the melody part where the sound rises, the sound raising process is performed, and in the melody part where the sound falls, It is also possible to perform a sound reduction process. In FIG. 5, vertical items “C” to “B” on the left side of the chart indicate the scale of the input music piece, and the upper horizontal items indicate music categories and methods of different melody. The arrows in the figure indicate to which sound the 12 semitones are to be transitioned. For example, in Mixoridia, the C # sound is lowered by a semitone and transitioned to the C sound.

  The melody changing unit 32 changes the melody of the music transmitted from the terminal device 2 in accordance with the transition criteria of FIG. 5 stored in the storage unit 31. That is, the note number is extracted from the MIDI file of the music transmitted from the terminal device 2, and the music category selected by the user is read out to confirm whether or not the music note number is in accordance with the music. If the melody of the music category is not followed, the pitch is changed to a pitch according to the melody and the note number is rewritten. Specifically, taking the track chunk “8F 00 90 3D 40 83 60 80 3D 00” in FIG. 3 as an example, the note-on command, pitch and velocity data that are the data of “90 3D 40” Then, “90 3C 40” is rewritten (that is, de # is rewritten to de), and “80 3D 00” that is the part of the note-off command is rewritten as “80 3C 00” (that is, de # is de).

  In addition, when changing the pitch without being restricted by the rules for raising and lowering the sound stored in the storage means 31, the pitches of the preceding and succeeding sounds to be changed are detected, and the intermediate tone and Change the pitch so that In other words, if there is a sound that is not included in the melody while the scale is going up, it is changed to raise the sound, and conversely, it is not included in the target melody while the scale is going down. If sound is present, change it to lower the sound so that the sound flows naturally. Specifically, when changing the melody that has the note number “3C (de)”, “3D (de #)”, and “3E (re)” to a melody that does not include “de #”, Read the previous and next note numbers “3C” and “3E”, and determine whether the note numbers increase or decrease. At this time, since the note number is increasing, the sound of “3D” is raised to the pitch “3E” included in the melody. Conversely, when changing the melody that has the note number “3E (Le)”, “3D (Do #)”, and “3C (Do)” to a melody that does not include “Do #”, The numbers “3C” and “3E” are read out and the note numbers are compared to determine whether the pitch is increasing or decreasing. At this time, since the note number is changing in a decreasing direction, the sound of “3D” is lowered to the pitch “3C” included in the melody.

  Also, it is possible to decide to raise or lower the sound based on the velocity of the sound before and after the change target. For example, the velocity of the sound before and after the change target is detected, and it is determined whether the velocity value has increased or decreased. Then, in a melody where the velocity increases, a process that raises the sound to be changed is performed, and conversely, in a melody where the velocity decreases, a process that lowers the sound that is changed. Can also be done.

  Similarly, the time signature changing means 33 changes the time signature of the music transmitted from the terminal device 2 to the time signature of the music category according to the time signature of the music category stored in the storage means 31. If the time signature decreases when this time signature is changed, all the notes of the beat are removed. Specifically, for example, when changing the music of 4 beats to 3 beats, as shown in FIG. 6 (a), the process of removing the note of "sixteenth note label and fa" of the fourth beat In addition to the above, as shown in (b), the process of removing the third beat “sixteenth note fa, fa, fa, so” is performed. Alternatively, as shown in FIG. 5C, the second beat “sixteenth note label and dotted eighth rest” is removed. In addition, as shown in FIG. 6D, an empty beat of 1 beat is inserted after a predetermined beat (the second beat and the fourth beat in the figure), and the obtained 6 beats are 3 beats for 2 bars. It is also possible to perform a process of dividing into two.

  On the other hand, when changing the time signature, when increasing the time signature from 3 to 4 time, etc., the length of the constituent sound is increased and matched to that time, or a rest is inserted to match the time.

  In addition, when performing sound deletion or addition processing in this way, the image of the original music may be lost. For this reason, it is also possible to perform a process of removing unimportant sounds from constituent sounds in a measure, or extending important sounds. Whether or not it is important, for example, the pitch distribution of that bar is extracted and the chord (chord) of that bar is detected. If the sound is unacceptable, it can be determined that it is a “non-important sound”.

  Further, when such a time signature is changed, the rhythm may be changed in accordance with the time signature change. For example, a 4-beat is “strong beat, weak beat, medium beat, weak beat”, but a 3-beat is “strong beat, medium beat, weak beat”. For this reason, the sound intensity based on the time signature is stored in advance, and when the time signature is changed, the sound intensity (velocity in the MIDI file) is changed based on the time signature. At the time of this change, the maximum value and the minimum value of the sound intensity within the measure are extracted, and the sound intensity is exchanged and stored within the range. For example, in the case where the velocities of four sounds are “120”, “60”, “100”, and “50”, when the sound of “50” is removed from these to make three beats, “120” in order from the first beat. Change the velocity to “100” “60”.

  The tempo changing unit 34 changes the tempo of the original music using the ratio stored in the storage unit 31 as the correction ratio, and corrects the tempo of the original music at a rate corresponding to the selected music category. For example, when arranging music that includes 120 quarter notes per minute into Indian music, the tempo ratio is stored as 50% in the storage means 31, so that the quarter note is 60 tempo per minute. change. Of course, the tempo changing means 34 may store not only the ratio but also the tempo as an absolute value and read it to change the tempo, but if it is stored as a ratio, the image of the original music piece is stored. Can leave.

  The timbre changing means 35 outputs a control signal for changing the timbre of the sound output from the MIDI file thus changed. This sound waveform processing uses an envelope generator to output an ASDR control signal having four parameters to the sound source. As shown in FIG. 7, Attack (attack: rise of sound), Decay (decay) : Attenuation, Sustain (sustain: retention after attenuation), and Release (release: reverberation) signals are output. Of these, Attack sets the time from the start of performance until the maximum volume of the sound is reached, and Decay is a parameter related to the time from the maximum volume to the Sustain level. Sustain is a parameter that sets the output volume as long as the performance continues, and Release sets the time from the end of the performance until the end of the sound. These parameters are stored in the storage means 31 as a change ratio with respect to the music to be arranged. For example, when a certain music is converted into a bell sound of Java music, as shown in FIG. Is extended or shortened to 100%, decay time ratio 200%, sustain level ratio 150%, release time ratio 125%, and the like. Thereby, even when a note-off signal is output, it can be converted into a sound having a reverberation and output.

  The tone color changing means 35 also changes the musical instrument type for changing the type of output sound. In the envelope generator, the envelope for the sound waveform is changed. Here, the instrument type is changed to change the waveform in the envelope. This musical instrument type is similarly stored in the storage means 31 for each music category. For example, “fiddle”, “harp”, “bagpipe” in Celtic music, and “violin”, “cello”, “contrast” in gypsy music. Instrument type such as “Bus” is stored. When the music category is selected, any one of these instrument types is arbitrarily selected and transmitted to the terminal device 2 side. In addition, when changing this tone, the presence or absence of vibrato and the type of vibrato for each music category are stored. For example, when Celtic music is selected, without vibrato, when gypsy music is selected. When frequency-modulated vibrato is selected and Arabic music is selected, it is set to frequency-modulated or amplitude-modulated vibrato, and the waveform characteristics are changed.

  The transmission / reception means 36 of the server computer 3 outputs the MIDI file thus changed to the terminal device 2 of the client, and the terminal device 2 side outputs the output means 24 such as a sound source based on the received MIDI file and control signal. Use to output.

  Next, a processing flow when the music is arranged in the folk music style using the automatic arrangement system 1 configured as described above will be described with reference to the flowchart of FIG.

  First, the terminal device 2 on the client side accepts input of a song to be arranged according to the user's selection (step S1). When accepting this selection input, the terminal device 2 accesses the server computer 3, displays the screen shown in FIG. 4, accepts the original song button displayed in the upper left column of the screen, and selects the desired song. Accept selection. Here, it is assumed that a 4-beat musical piece described in the MIDI file is selected. Next, returning to this screen, an input as to what kind of music category the music should be arranged is accepted (step S2). Even when this input is accepted, the selection input of the music category surrounded by the grid frame in FIG. 4 is accepted, and these original music pieces and the selected music category are transmitted to the server computer 3 (step S3). .

  On the server computer 3 side that has received the information of the original music and the music category (step T1), the music category is extracted from the received data, and the time, melody, waveform characteristic of the corresponding music category is extracted from the storage means 31. Information such as tempo and ADSR is read (step T2). First, when the read time signature does not match the original music, time signature change processing is performed (step T3), and sound volume correction processing is also performed at that time. At this time, for example, when Celtic music is selected as the music category, the process of making three beats is performed, and the first beat is a strong beat, the second beat is a middle beat, and the third beat is a weak beat.

  Next, after changing the time signature in this way, the melody of the original music is changed to the melody of the melody of the music category (step T4). At this time, the pitch is changed according to the table shown in FIG. 5, or the pitch is changed according to the melody or volume flow. Note that the melody change process after changing the time signature will cause the number of sounds to increase or decrease with the change in time signature, and if the sound decreases, delete it after changing the pitch. This is to prevent such waste.

  Then, after changing the time signature and melody in this way, the tone color changing process is performed (step T5). In this tone color changing process, the attack time ratio, decay time ratio, sustain level ratio, and release time ratio are read from the storage means 31, and the ratios are added to the attack time, decay time, sustain level, and release time of the original music. At this time, when Celtic music is selected as the music category, the attack value and decay time value are set to 50%, and the sustain level and release time value are set as they are (100%). That is, the sound has a sharp rise. After changing the sound envelope in this way, select the instrument type belonging to the music category to change the waveform in the envelope, and output it with the tone of the instrument, and also add vibrato processing I do.

  Finally, in order to correct the tempo ratio of the music, similarly, the tempo ratio is read from the storage means 31, and the ratio is added to the tempo of the original music (step T6). When Celtic music is selected, the tempo is changed to 150% of the original music tempo.

  After rewriting the MIDI file in this way, the MIDI file is transmitted to the terminal device 2 on the client side (step T7), received and output using the output means 24 on the terminal device 2 side (step S4, S5).

  As described above, according to the above-described embodiment, the time signature, the melody, and the waveform characteristics of the output sound corresponding to the selected music category are read, and the time signature and melody of the first music, and the waveform characteristics of the timbre are changed. Since it is output, it can be output closer to the music of the music category to be arranged.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment.

  For example, in the above embodiment, the music composed of the MIDI file is selected as the original music, but the music stored in a different format may be arranged. In this case, as the simplest method, music stored in another format may be converted into a MIDI file and arranged using the above-described processing.

  In the above embodiment, the time signature, melody, envelope, instrument, tempo, and the like are all changed. However, these changes may be changed with priority. That is, when the degree of arrangement is increased, all of these elements can be changed, and when the degree of arrangement is reduced, only the time signature, melody, and envelope may be changed.

  Furthermore, in the above-described embodiment, the automatic arrangement system 1 including hardware and software for arranging music has been described. However, the program is stored in a storage medium as a program for operating the hardware (server computer 3 or terminal device 2) constituting the arrangement system. The automatic arrangement system 1 may be realized by executing this.

DESCRIPTION OF SYMBOLS 1 ... Automatic arrangement system 2 ... Terminal device 3 ... Server computer 21 ... Music input reception means 22 ... Selection reception means 24 ... Output means 31 ... Storage means 32 ... Melody changing means 33 ... Time signature changing means 35 ... Tone changing means

Claims (8)

In an automatic arrangement system that arranges input music,
Music input accepting means for accepting input of the first music created by the first method;
Selection accepting means for accepting selection of a music category of a different type from the first music piece;
Corresponding to the music category, storage means storing data relating to the time signature and the melody of the music belonging to the music category and the waveform characteristics of each output sound,
When another music category is selected by the selection receiving unit, the time of the selected music category is read from the storage unit and the time of the first music created by the first melody is changed. Change means,
When another music category is selected by the selection accepting means, the melodies for reading the melodies of the selected music category from the storage means and changing the melodies of the first music created by the first melodies Change means,
When another music category is selected by the selection receiving means, the waveform characteristic of the output sound in the selected music category is read from the storage means, and the first music created by the first melody Timbre changing means for changing the waveform characteristics of the output sound;
An automatic arrangement system comprising: output means for outputting music changed by the time change means, melody change means, and tone color change means. The automatic arrangement system according to claim 1, wherein the time signature changing means changes the time signature by removing a sound within a predetermined beat. The automatic arrangement system according to claim 1, wherein the time signature changing means changes the time signature by changing the length of the sound. The automatic arrangement system according to claim 2 or 3, wherein the time signature changing means changes the volume of the sound within the time signature after changing the time signature. 2. The automatic arrangement system according to claim 1, wherein the melody changing means performs a sound increase or a sound decrease according to a pitch before and after the sound to be changed. 2. The automatic arrangement system according to claim 1, wherein the melody changing unit is configured to raise or lower the sound according to the volume before and after the sound to be changed. In an automatic arrangement method that arranges the first music created by the first method into other music,
Receiving a selection of a different type of music category from the first song;
Corresponding to the music category, data related to the time signature and melody of the music belonging to the music category and the waveform characteristics of each output sound are stored, and when a desired music category is selected,
Reading the time signature of the selected music category and changing the time signature of the first song created by the first melody;
Reading out the melody of the selected music category and changing the melody of the first song created in the first melody;
Reading out the waveform characteristics of the output sound in the selected music category, and changing the waveform characteristics of the output sound in the first music created by the first melody;
Outputting the music in which the time signature, melody and waveform characteristics are changed, and an automatic arrangement method. 8. The automatic arrangement method according to claim 7, wherein the melody is changed after the time signature is changed.

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