JP2005222052A5 - - Google Patents

Description

Automatic accompaniment device

  The present invention relates to an automatic accompaniment apparatus that performs automatic accompaniment by changing an automatic accompaniment pattern according to chord information.

  Conventionally, an automatic accompaniment device stores an automatic accompaniment pattern consisting of a plurality of parts, and changes (alternates) according to chord information instructed from a keyboard or the like, that is, a part of an accompaniment pattern according to the instructed chord There is known one having a function of outputting by raising or lowering the pitch of the note.

Japanese Patent Laid-Open No. 11-219182 (Patent Document 1) discloses an automatic accompaniment apparatus that can perform automatic accompaniment in an alternation manner according to a musical role. For example, in parts such as intros and endings, an accompaniment mainly composed of melody is formed, so that the pitch is shifted as a whole only in accordance with route information of designated chord information. This way of alternation is called obligato type. On the other hand, with respect to the main part of the music piece, the alternation is performed so that the shift amount is reduced so that the accompaniment range does not change greatly according to the change of the chord information. This alternation method is called a chord type.
JP-A-11-219182

  However, in the automatic accompaniment device disclosed in Patent Document 1, when performing the chord type alteration, the pitch of the note information constituting the accompaniment pattern is a chord constituent sound specified by the designated chord information. However, there was a problem that the pitch jumped to another chord component. In addition, the pitch that is not a chord constituent sound is changed to another pitch that is not a chord constituent sound, and the pitch may be greatly changed, resulting in a musically undesirable accompaniment pattern.

  The present invention has been made to solve such problems, and an object of the present invention is to provide an automatic accompaniment apparatus that can change musically the pitches of notes constituting an automatic accompaniment pattern.

In order to solve the above-described problem, an automatic accompaniment apparatus according to claim 1 is provided with an input means for inputting chord information having route information and chord type information, and an automatic accompaniment pattern composed of a plurality of note information. A plurality of storage means for storing, a selection means for selecting an arbitrary automatic accompaniment pattern from a plurality of automatic accompaniment patterns stored in the storage means, and an automatic accompaniment pattern selected by the selection means is read from the storage means Automatic accompaniment means for performing automatic accompaniment based on the chord information input by the input means, wherein the note name indicated by the note information constituting the automatic accompaniment pattern stored in the storage means is the The pitch indicated by the note information is changed when it matches any of the pitch names of the chords specified by the chord information input to the input means. If it does not match any of the constituent sounds of the chord specified by the chord information input to the input means, the pitch is changed based on the route information included in the chord information input by the input means. It includes a pitch changing means for the automatic accompaniment means is for performing an automatic accompaniment based on the pitch, which is formed by the pitch changing means.

  The automatic accompaniment apparatus according to claim 2 is an input means for inputting chord information having route information and chord type information, a storage means for storing a plurality of automatic accompaniment patterns composed of a plurality of note information, and the storage means. Selecting means for selecting an arbitrary automatic accompaniment pattern from among a plurality of automatic accompaniment patterns stored in the memory, and reading out the automatic accompaniment pattern selected by the selection means from the storage means to the chord information input by the input means And automatic accompaniment means for performing automatic accompaniment based on the pitches indicated by the note information constituting the automatic accompaniment pattern stored in the storage means. If it is, it constitutes the automatic accompaniment and the pitch names of a plurality of pitches constituting the chord specified by the chord information inputted to the input means Detecting means for detecting a pitch difference from a pitch name indicated by note information, a plurality of pitch names detected by the detecting means, and an automatic accompaniment pattern stored in the storage means Pitch changing means for changing the pitch indicated by the note information to the pitch corresponding to the pitch name having the smallest pitch difference among the pitch differences between the pitch names indicated by the note information, and The automatic accompaniment means performs automatic accompaniment based on the pitch formed by the pitch changing means.

The automatic accompaniment apparatus according to claim 3, wherein a detecting means for detecting whether the pitch changed by the pitch changing means is currently sounding, and a sound changed by the pitch changing means by the detecting means. When it is detected that the pitch is being pronounced, note information constituting the automatic accompaniment pattern stored in the storage means is stored among the pitch names of the pitches constituting the chord inputted by the input means. and a second pitch change means for changing the pitch corresponding to the next smallest pitch name pitch difference between the pitch of the pitch names shown.

According to the automatic accompaniment apparatus according to claim 1, the note name indicated by the note information constituting the automatic accompaniment pattern stored in the storage means is the sound of the constituent sound of the chord specified by the chord information input to the input means. If it matches any of the names, the pitch indicated by the note information is not changed, and if it does not match any of the constituent sounds of the chord specified by the chord information input to the input means, the pitch the so code information entered is provided with a pitch changing means for changing, based on the route information with by the input unit, when a new code is specified by the keyboard or the like, the pitch of the automatic accompaniment pattern There is an effect that the pitch of the notes constituting the automatic accompaniment pattern can be appropriately changed musically because the pitch is not greatly changed and the fluctuation in pitch is reduced.

  According to the automatic accompaniment apparatus according to claim 2, when the pitch indicated by the note information constituting the automatic accompaniment pattern stored in the storage means is a constituent sound of a chord assigned to the note information, the input means Detecting means for detecting a pitch difference between a pitch name of a plurality of pitches constituting a chord specified by the chord information input to and a pitch name indicated by note information constituting an automatic accompaniment, and detection thereof The pitch name with the smallest pitch difference among the pitch differences between the pitch names detected by the means and the pitch names indicated by the note information constituting the automatic accompaniment pattern stored in the storage means Is provided with a pitch changing means for changing the pitch indicated by the note information, so that the notes of the automatic accompaniment pattern are automatically generated when a new chord is specified by the keyboard or the like. Is specified by the keyboard etc. The pitch of the notes that make up the automatic accompaniment pattern can be changed in a musically appropriate manner because the pitch difference is changed to the smallest pitch among the constituent sounds of the keyboard and fluctuations in pitch are reduced. effective.

According to the automatic accompaniment apparatus according to claim 3, in addition to the effect produced by the automatic accompaniment apparatus according to claim 3, the detection means for detecting whether the pitch changed by the pitch change means is currently sounding; When the detection means detects that the pitch changed by the pitch change means is sounding, the storage means among the pitch names of the plurality of pitches constituting the chord input by the input means And a second pitch changing means for changing the pitch to the pitch corresponding to the next smallest pitch with respect to the pitch of the pitch indicated by the note information constituting the automatic accompaniment pattern. Therefore, when a new chord is specified on the keyboard etc., the pitch of the automatic accompaniment pattern will not change significantly, and the same pitch will not continue, so change the automatic accompaniment. There is an effect that can be.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view showing an appearance of an automatic accompaniment apparatus 1 according to an embodiment of the present invention. The automatic accompaniment apparatus 1 has a keyboard 5, an operator 6 such as various switches, and a display 11 exposed outside the casing, and a processing unit 3 and a memory unit 7 inside the casing. I have. The musical sound formed by the automatic accompaniment apparatus 1 is output from an output terminal (not shown) and sent to the speaker 2.

  The processing unit 3 is equipped with a sound source 4 and a CPU (Central Processing Unit) 10, and the memory unit 7 has a ROM 8 (read-only memory) for storing a plurality of automatic accompaniment patterns (accompaniment sequences), A RAM 9 (random access memory) in which an automatic accompaniment pattern selected by operating the operator 6 among the plurality of automatic accompaniment patterns is read from the ROM 8 and stored is mounted. The keyboard 5 is a performance operator for performing a performance, and includes a key range for playing a melody (melody key range) and a key range for specifying a chord (code key range).

  The operation panel of the automatic accompaniment apparatus 1 is provided with an operator 6 and a display 11. As the operation element 6, a tempo setting switch for setting the tempo of performance, an accompaniment pattern selection switch for selecting an automatic accompaniment pattern, a start / stop switch for instructing start or stop of automatic performance, and the like are provided.

  The tempo setting switch is an operator that sets the tempo of the automatic accompaniment. The accompaniment pattern selected by the accompaniment pattern selection switch is preset with a predetermined tempo value. When this tempo setting switch is not operated, When the performance is performed at the preset tempo and the tempo setting switch is operated, the tempo value is changed.

  The accompaniment pattern selection switch is a switch for selecting an automatic accompaniment pattern. Accompaniment information suitable for genres such as rock, jazz, pop, and classical music is stored in the ROM 8, and one of these accompaniment pattern selection switches is used to automatically play the accompaniment. Can do.

  The start / stop switch is a switch for instructing to start or stop the automatic accompaniment. If the start / stop switch is operated while the automatic accompaniment is stopped, the automatic accompaniment starts. If the start / stop switch is operated while the automatic accompaniment is being executed, the automatic accompaniment is stopped. Is done. In addition to these operators, the automatic accompaniment apparatus 1 includes a switch for designating divisions such as fill-in, intro, and ending, a switch for setting the tone of each part, and a volume for adjusting the volume, although not shown. However, since it is not the gist of the present invention, the description thereof is omitted.

  The display 11 is composed of an LCD or the like, and displays the accompaniment pattern name selected by the accompaniment pattern selection switch and the set tempo value as numerical values.

  Next, the electrical configuration of the automatic accompaniment apparatus 1 will be described with reference to FIG. FIG. 2 is a block diagram showing an electrical configuration of the automatic accompaniment apparatus 1. The automatic accompaniment apparatus 1 includes a CPU 10, a ROM 8 that stores a control program executed by the CPU 10, a plurality of automatic accompaniment patterns, and the like, and a RAM 9 that provides a working memory area when the CPU 10 executes the control program. A keyboard 5 for performing performance, an operator 6 for setting various parameters and instructing the automatic accompaniment apparatus 1, a display 11 for displaying parameters set by the operator 6, and transmission by the CPU 10. And a sound source 4 for generating a musical sound signal corresponding to the performance information, which are connected to each other by a bus line. The output of the sound source 4 is input to the amplifier 12, and the amplifier 12 drives the speaker 2.

  The ROM 8 stores a control program for performing the processing of the flowcharts shown in FIGS. 3, 4, 6, and 7, an accompaniment pattern shown in FIG. Accompaniment patterns are divided into genres such as rock, jazz, pop, and classic, and accompaniment patterns for each genre are stored for each division such as intro, main 1, fill-in 1, main 2, fill-in 2, and ending. Has been.

  As described above, the RAM 9 stores the automatic accompaniment pattern memory 9a that stores the automatic accompaniment pattern selected by the user, and the note that is used when the pitch of the notes constituting the automatic accompaniment pattern is converted by the automatic accompaniment process. And a chord constituent sound list memory 9b for storing a chord constituent sound list in which the constituent sounds are arranged in order from the lowest pitch, and an automatic accompaniment pattern. And a conversion information table memory 9c for storing conversion information indicating the pitch of the note and the pitch obtained by converting the pitch of the note.

  In the conversion information table memory 9c, the user designates a chord by pressing the key, the note-on of the notes constituting the automatic accompaniment pattern is read, and the note-on is sent to the sound source according to the designated chord. When this is done, conversion information indicating the pitch of the notes of the automatic accompaniment pattern that have been converted and sent to the sound source is stored, and the note-off corresponding to that pitch is read from the automatic accompaniment pattern. It is erased when it is issued.

  When the CPU 10 detects that a key has been operated in the melody key area, the CPU 10 transmits performance information such as sound generation start or sound generation stop corresponding to the operation to the sound source 4. On the other hand, when it is detected that the key has been operated in the code key area, it is determined whether or not the code has been confirmed by the operation. If the code is not confirmed, nothing is done. If the code is confirmed, route information (root) and code type information (code type) of the code are obtained. Based on the route information and chord type information, the accompaniment pattern read from the accompaniment pattern memory 9a of the RAM 9 is processed, and the performance information that has been processed is transmitted to the sound source 4.

  Next, processing executed by the CPU 10 according to the control program stored in the ROM 8 will be described with reference to FIGS. FIG. 3 is a flowchart showing the main process, which is executed until the automatic accompaniment apparatus 1 is turned on and then shut off.

  First, initialization processing is performed (S1). As the initialization process, a time for performing automatic accompaniment is set to 0, or a process of displaying a predetermined initial screen on the display 7 is performed. Next, it is determined whether or not a key pressing event has occurred (S2). Here, the processing for the melody key range is omitted for the sake of simplicity, and it is determined whether or not there is a key depression or key release in the chord key range.

  If no key-pressing event has occurred (S2: No), the process proceeds to S5. If a key-pressing event has occurred (S2: Yes), it is determined whether or not a code has been confirmed by a key-pressing change. (S3). For example, when only one key is pressed, the code is not fixed, and when two or more keys are pressed, the code root and type are determined by pressing the key. When it can be identified, the code is confirmed.

  If the code is not fixed (S3: No), the process proceeds to S5. If the code is fixed (S3: Yes), the route and type of the code are obtained (S4). Various methods are known for obtaining the route and type of a code from a plurality of key presses. The obtained code route and type are stored in a predetermined storage area of the RAM 9. A plurality of chord constituent sounds constituting the chord are stored in the ROM 8 for each type of chord. When the chord is determined and processing is performed based on the chord constituent sounds, the chord constituent sounds are referred to the ROM 8. To get.

  Next, it is determined whether or not a clock event has occurred (S5). This clock event is an event that the CPU 10 is provided with a timer (not shown) and the timer instructs the CPU 10 at time intervals of ticks when automatic accompaniment is started. The tick is a time interval corresponding to the tempo value, and is a time obtained by dividing the time length of one beat specified by the tempo value by a predetermined value (for example, 120). For example, if the tempo value is 120, the length of one beat is 500 msec, and when this is divided by 120, one tick is 4.17 msec.

  When this clock event occurs (S5: Yes), a clock event process described later is executed. When the clock event has not occurred (S5: No) and when the clock event processing has been completed, it is next determined whether or not the operator on the operation panel has been operated (S8). When the operator is operated (S7: Yes), the operator process described later is performed. When the operation element is not operated (S7: No) and when the operation element process is terminated, the process returns to S2.

  Next, the operator process will be described with reference to FIG. FIG. 4 is a flowchart showing the operator processing. First, it is determined whether or not the tempo value has been changed by operating the tempo setting knob (S11). When the tempo value is changed (S11: Yes), the tick value is calculated according to the changed tempo value, and the timer is set so that the timer instructs the CPU 10 at the calculated time interval ( S12: Tempo change process).

  If the tempo change process has been completed or if the tempo value has not been changed (S11: No), it is next determined whether or not the accompaniment pattern has been changed by operating the accompaniment pattern selection switch (S13). .

  When the accompaniment pattern is changed (S13: Yes), the automatic accompaniment is set to be performed with the changed accompaniment pattern, and the tick value is set according to the tempo value set in the changed accompaniment pattern. The timer is set so that the timer instructs the CPU 10 at the calculated time interval (S14: pattern change process).

  If the pattern change process is completed or if the accompaniment pattern has not been changed (S13: No), it is next determined whether or not the start / stop switch has been operated (S15). When the start / stop switch is operated (S15: Yes), when automatic accompaniment is stopped, the timer starts to start automatic accompaniment, and when automatic accompaniment is performed, automatic The timer count is stopped so as to stop the accompaniment (S16: start / stop change process). When the start / stop change process is completed, or when the start / stop switch is not operated (S15: No), the operation process is terminated and the process returns to the main process.

  Next, accompaniment pattern data stored in the ROM 8 will be described with reference to FIG. FIG. 5 shows an example of data constituting the accompaniment pattern. The accompaniment pattern stores MIDI messages that are events corresponding to time (dt) in the order of performance. The time is the time until the next MIDI message is sent to the sound source 4, and the unit of this time is a tick.

  The MIDI message is information to be communicated defined by the MIDI standard, and defines a program change for setting a tone color, a control change for setting a volume, a note-on for instructing the start of sound generation, and the like. The MIDI message can control a plurality of performance parts by the channel number.

  In the example shown in FIG. 5, the first data is set to time 0, and a program change is stored as a MIDI message. Accordingly, the program change is sent to the sound source 4 simultaneously with the start of the performance. When receiving the program change, the sound source 4 sets the tone color of the part designated by the program change to the tone color designated by the program change.

  In the second data, the time is set to 0, and a control change is stored as a MIDI message. Since the time of the first data is set to 0, this control change is also sent to the sound source 4 simultaneously with the start of the performance. When the sound source 4 receives this control change, it sets the volume of the part specified by the control change.

  In the third data, the time is set to 0, and data indicating the route and type of the code (representing the code of C: C major) is stored. Although the time of the second data is set to 0, the data indicating this chord indicates the route and type of the chord of the stored accompaniment pattern, and the accompaniment sound is recorded according to the chord information specified by the key depression. It is used when determining the pitch and is not sent to the sound source 4. In addition, this code is effective for note-on until the next designation as in the case where it is described in a normal musical score. In other words, this chord is assigned to note-on until the next chord is specified.

  In the fourth data, time is set to 120, and note-on (E: represents pitch name) is stored as a MIDI message. Since the time of the third data is set to 0, this note-on is also read simultaneously with the start of the performance. The note number, which is the note-on pitch, is altered according to the chord designated by the keyboard 5 and sent to the sound source 4. Upon receipt of this note-on, the sound source 4 generates a musical tone having a pitch designated by the note-on in a part designated by the note-on at a volume corresponding to the velocity (key-pressing speed) designated by the note-on. .

  In the fifth data, the time is set to 60, and note-on (F) is stored as a MIDI message. Since the time of the fourth data is set to 120, after the note-on of the third data is sent to the sound source 4, the fourth note-on is altered 120 seconds after being sent to the sound source. Sent to 4.

  In the sixth data, the time is set to 2, and note-off (E) is stored as a MIDI message. Since the time of the fifth data is set to 60, the note-on of the fourth data is read out 60 ticks after being sent to the sound source 4. When the note-on is sent to the sound source 4, change information indicating which pitch is changed to which pitch and sent to the sound source 4 is stored in the change information table memory 9 c of the RAM 9. When note-off is read, the corresponding pitch change information is read from the change information stored in the RAM 9, the note-off note number is changed, and sent to the sound source 4. When note-off is sent, the corresponding change information stored in the change information table memory 9c is deleted.

  When the sound source 4 receives the note-off, the sound source 4 attenuates the musical tone having the pitch specified by the note-off at a speed corresponding to the velocity (key-release speed) specified by the note-off in the part specified by the note-off. . Hereinafter, similarly, accompaniment patterns are stored.

  Next, the clock event will be described with reference to FIG. FIG. 6 is a flowchart showing clock event processing activated at tick time intervals.

  First, the variable t representing time is decremented by 1 (S21). This variable t is for executing the events sequentially stored in the accompaniment pattern according to the passage of time. When one event is executed, the time until the next event to be executed is set. If it becomes 0, the event is executed.

  Next, it is determined whether or not the time variable t is 0 or a negative value (S22). If the time variable t is a positive value (S22: No), the clock event process is terminated and the process returns to the main process. When the time variable t is 0 or a negative value (S22: Yes), the event MIDI message is read (S23), and it is determined whether or not the MIDI message is note information indicating note-on or note-off. (S24). If it is note information (S24: Yes), note information processing described later is performed (S25).

  After performing the note information processing, the processed note information or the MIDI message determined not to be the note information in the determination processing in S24 is transmitted to the sound source 4 (S26), and the time dt of the next event is set as a time variable. t is added (S27), and the process returns to S22.

  Next, note information processing in the automatic accompaniment apparatus 1 will be described with reference to FIG. FIG. 7 is a flowchart showing note information processing. Here, for simplicity of explanation, a case where note information is note-on will be described. When the note information is note-off, the note-on pitch corresponding to the note-off is referred to the conversion information table stored in the conversion information table memory 9c of the RAM 9, and sound generation is started by the note-on. It controls to mute the musical sound.

  In the note-on process, first, a remainder obtained by dividing a note number that is a value indicating the note-on pitch by 12 is obtained, and the remainder is set as a new note number. That is, it is rounded to a value from 0 to 11 which is a note number included in the lowest octave (S31). As a result, the note name corresponding to the note number is converted. In the MIDI standard, note number 0 is specified as pitch name C and note number 1 is specified as pitch name C # (hereinafter the same).

  Next, it is determined whether or not the rounded pitch is a basic note (S32). A basic note is a constituent sound of a chord assigned to this note. For example, if the chord is C, C, E, and G are basic notes, and if the chord is Cm, C, E ♭, and G are basic notes. In FIG. 5, the assigned code is a code designated immediately before note-on, for example, note-on (E) as the fourth data and note-on (F) as the fifth data. The code assigned to is the code (C) on the third line. Therefore, note-on (E) is a basic note, and note-on (F), which is data on the fifth page, is not a basic note.

  When the note number of note-on is a chord constituent sound (S32: Yes), an alternation is performed according to the type of chord instructed by the key depression (S33). This alteration is a conversion to match the chord type specified by the key press when the chord type stored in the accompaniment pattern is different from the chord type specified by the key press. is there. For example, when a major chord is designated as an accompaniment pattern and a minor chord is designated by pressing a key, conversion is performed to lower the third tone by a semitone. More specifically, if the accompaniment pattern note-on is E and a C major chord is assigned, and a key is pressed to specify a minor chord regardless of the root pitch, E converted to ♭. In addition, when note-on is C or G, it is not converted.

  Next, the pitch difference between the note processed in S33 and the pitch name corresponding to the pitch is calculated for each of a plurality of constituent sounds of the chord designated by the key depression, and the pitches are close (the pitch difference is A chord constituent sound list arranged in order from the smallest one is created, and the top pitch of the chord constituent sound list is designated (S34). Accordingly, if the note processed in S33 matches any of the chord constituent sounds, the matching pitch is designated as the leading pitch.

  The chord constituent sound list created in the process of S34 is stored in the chord constituent sound list memory 9b of the RAM 9. Note that the pitch difference here is not a simple note number difference, but a pitch difference between two sounds on the ring, assuming that twelve sounds constituting the octave are arranged in a ring shape. For example, the difference between the note number 1 and 5 is simply subtracted to 4, but the difference between the note number 1 and 11 is 13 by adding 12 to 1 and the difference from 11. 2 is the pitch difference.

  Next, when the designated pitch is smaller than the note number 50, 12 is added to obtain a pitch that is octave higher (S35). Next, it is determined whether or not the pitch for which the processing of S35 has been completed is the same pitch name as any of the pitches currently being sounded with reference to the conversion information table (S36). If it is not the same as the pitch name of the currently sounding pitch (S36: No), the octave is appropriately changed so as to be within a preferable pitch range according to the accompaniment pattern and tone (S53). 4 (S48).

  On the other hand, in the determination process of S36, when it is determined that the pitch is the same as the pitch that is currently sounding (S36: Yes), it is determined whether the pitch that is currently sounding is the same octave. (S37). If it is not the same octave as the currently sounding pitch (S37: No), then the pitch being sounded is based on the same pitch name as the original pitch stored in the accompaniment pattern. It is determined whether or not it is generated (S41). If it is generated from the same pitch name as the pitch name stored in the accompaniment pattern (S41: Yes), octave adjustment is performed according to the tone. (S53), and the note-on of the pitch is sent to the sound source 4.

  In the process of S37, if the designated pitch is the same octave as the pitch that is currently sounding (S37: Yes), or in the determination process of S41, the pitch is stored in the accompaniment pattern. If the pitch name is not based on the same pitch name as the high pitch name (S41: No), then the specified pitch is the last pitch in the chord constituent pitch list created in the process of S34. Whether or not (S38).

  When the designated pitch is not the last pitch in the chord constituent tone list (S38: No), it is listed next to the currently designated pitch among the pitches listed in order. Is specified (S39), and the process returns to S35.

  In the process of S38, if the specified pitch is the last pitch of the chord constituent sound list (S38: Yes), the pitch name (most accompaniment pattern) stored at the beginning of the chord constituent sound list Is determined as a note name to be generated this time (S40), and an octave adjustment is performed according to the tone color (S45). Next, it is determined whether or not the pitch for which the octave adjustment has been performed is currently sounding (S46). If the sound is being sounded (S46: Yes), a note-off instruction is given to stop the musical sound being sounded. Is transmitted to the sound source 4 (S47), and if not sounding (S46: No), the processing of S47 is skipped and the note-on corresponding to the pitch is transmitted to the sound source 4 (S48).

  On the other hand, in the process of S32, if the note-on pitch is not a chord constituent sound (S32: No), does it match the pitch name of the constituent sound of the chord designated by the key depression (ignoring the octave)? It is determined whether or not (S51). If they match (S51: Yes), the process proceeds to S45. If they do not match (S51: No), transpose is performed according to the route of the code indicated by the key depression. For example, if the root of the chord assigned to the note-on is C and the root of the chord designated by the key depression is F, the transposition is performed to a pitch that is four times higher, and the process proceeds to S53. After the octave adjustment is performed, the note-on of that pitch is sent to the sound source 4 (S48). As a result, the sound source 4 starts to generate a musical tone having a pitch designated by note-on. In the process of S48, a process of storing in the conversion information table 9c of the RAM 9 conversion information indicating to which pitch the pitch stored in the automatic accompaniment pattern has been converted is also performed.

  As described above, in the case where the pitch of the notes constituting the accompaniment pattern matches any one of the constituent sounds of the chord designated by the keyboard 5, the sound is generated with the pitch as it is, and the keyboard 5 If the note does not constitute the chord specified by, the predetermined conversion is performed. Therefore, if at least the pitch of the notes constituting the accompaniment pattern matches the pitch specified by the keyboard 5, the keyboard Therefore, the pitch of the accompaniment sound can be prevented from greatly jumping due to the chord specified by the keyboard 5.

  If the pitch of the notes constituting the accompaniment pattern is a constituent sound of a chord assigned to that pitch, the pitch difference from the pitch name of each constituent sound of the chord designated by the keyboard 5 is Based on this, a chord constituent sound list is created, and is first converted to the closest pitch. Therefore, the pitches of the notes stored in the accompaniment pattern are not greatly changed.

  In addition, if the closest pitch is already sounding, the pitch is selected from the chord component list, so that the pitch does not jump greatly and the accompaniment varies. Can be formed.

  Note that the pitch changing means described in claim 1 corresponds to the process of S34 and the process of S51 in the flowchart shown in FIG. The detecting means according to claim 2 corresponds to the process of S34 in the flowchart shown in FIG. 7, and the pitch changing means corresponds to the processes of S34, S36 and S53.

  The second pitch changing means according to claim 3 corresponds to the processes of S36, S39 and S53.

The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be easily made without departing from the spirit of the present invention. It can be guessed.
For example, in the above embodiment, instructed chord information is input from the keyboard 5, but chord information (chord progression) corresponding to the progress of the performance is stored in advance, and the chord information is read according to the progress of the performance. The code information may be input.

  In the above embodiment, by executing the control program, the CPU 10 changes the pitches of the notes read from the accompaniment pattern by referring to various alteration tables. And the pitch may be changed.

  In the process of the flowchart shown in FIG. 7 of the above embodiment, first, in the process of S32, it is determined whether or not the pitch rounded in the process of S31 is a basic note. Processing is performed depending on whether it is not a note, but first, it is determined whether or not the rounded pitch matches the pitch name of the constituent sound of the chord designated by the keyboard 5. You may make it perform the process according to the case where it is the structure sound of a chord, and the case where it is not the structure sound of the designated chord.

  In the above embodiment, the automatic accompaniment pattern stores chord information indicating the chord assigned to the accompaniment pattern. However, the accompaniment pattern is stored in a predetermined key (for example, C major). It is good as it is.

  Moreover, in the said embodiment, the automatic accompaniment pattern selected by the user operating the operation element 6 which selects an automatic accompaniment pattern from the some memorize | stored automatic accompaniment patterns shall be selected. However, the automatic accompaniment pattern may be selected according to the pitch of the root of the chord designated by the user using the keyboard 5 or the like and the type of the chord.

It is the block diagram which showed the electrical structure of the automatic accompaniment apparatus of this invention. It is the block diagram which showed the electrical structure of the automatic accompaniment apparatus. It is a flowchart which shows a main process. It is a flowchart which shows an operation element process. It is a figure which shows an example of an accompaniment pattern. It is a flowchart which shows a clock event process. It is a flowchart which shows a note-on process.

Explanation of symbols

1 Automatic accompaniment device 4 Sound source 5 Keyboard (input means)
6 Accompaniment pattern selection switch (selection means)
8 ROM (storage means)
9 RAM
10 CPU

Claims (3)

Input means for inputting chord information having route information and chord type information, storage means for storing a plurality of automatic accompaniment patterns composed of a plurality of note information, and a plurality of automatic accompaniment patterns stored in the storage means Selecting means for selecting any automatic accompaniment pattern from among them, automatic accompaniment means for reading out the automatic accompaniment pattern selected by the selecting means from the storage means and performing automatic accompaniment based on the chord information input by the input means; In an automatic accompaniment device with
When the pitch name indicated by the note information constituting the automatic accompaniment pattern stored in the storage means matches any of the pitch names of the chords specified by the chord information input to the input means, If the pitch indicated by the note information does not change and does not match any of the constituent sounds of the chord specified by the chord information input to the input means, the pitch is input by the input means Pitch change means to change based on the route information that the chord information has,
The automatic accompaniment means, an automatic accompaniment apparatus and performs an automatic accompaniment based on the pitch, which is formed by the pitch changing means. Input means for inputting chord information having route information and chord type information, storage means for storing a plurality of automatic accompaniment patterns composed of a plurality of note information, and a plurality of automatic accompaniment patterns stored in the storage means Selecting means for selecting any automatic accompaniment pattern from among them, automatic accompaniment means for reading out the automatic accompaniment pattern selected by the selecting means from the storage means and performing automatic accompaniment based on the chord information input by the input means; In an automatic accompaniment device with
When the pitch indicated by the note information constituting the automatic accompaniment pattern stored in the storage means is a constituent sound of a chord assigned to the note information, it is specified by the chord information input to the input means Detecting means for detecting a pitch difference between a pitch name of a plurality of pitches constituting a chord and a pitch name indicated by note information constituting the automatic accompaniment;
The smallest pitch difference among pitch differences between the pitch names detected by the detecting means and the pitch names indicated by the note information constituting the automatic accompaniment pattern stored in the storage means. Pitch change means for changing the pitch indicated by the note information to the pitch corresponding to the pitch name, and the automatic accompaniment means performs automatic accompaniment based on the pitch formed by the pitch change means. automatic accompaniment apparatus, which comprises carrying out. Detecting means for detecting whether the pitch changed by the pitch changing means is currently sounding;
When it is detected by the detecting means that the pitch changed by the pitch changing means is sounding, among the pitch names of a plurality of pitches constituting the chord input by the input means, the storage Second pitch changing means for changing the pitch difference from the pitch name indicated by the note information constituting the automatic accompaniment pattern stored in the means to a pitch corresponding to the next lowest pitch name. The automatic accompaniment apparatus according to claim 2, wherein: