JP2005141124A - Accompaniment series generating program and accompaniment series generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate accompaniment series having natural feeling for human auditory sense based on a code data column. <P>SOLUTION: Based on the code data column that represents a series of codes, a reference pitch (a fundamental note or a base note for the case of an on-base code) related to the code for every code data is extracted(S14). A series of reference pitches being extracted is divided into a plurality of code advancing segments in which each reference pitch successively advances with a series stream (S16). Then, base series data representing accompaniment series are generated based on the reference pitch for every divided code advancing segment (S18). During the generation of the base series data, consideration is given if the data include all base sound pitches, which are included in the base series, in a prescribed base pitch extent and if they have compatibility with the melody series corresponding to the code data column or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an accompaniment sound string generation program and an accompaniment sound string generation device for generating an accompaniment sound string based on a code data string representing a series of chords.

Conventionally, for example, as shown in Patent Document 1 below, an accompaniment that automatically generates an accompaniment tone sequence using a chord data sequence representing a series of chords and an accompaniment pattern representing pitches and note lengths. A sound string generator is known.
JP 2002-268638 A

  The chords correspond to the flow of music and progress with a smooth series of flows for each predetermined chord progression section. However, in the above-mentioned conventional apparatus, the chord progression situation is not taken into account, that is, the chord progression section is not taken into consideration at all, and the accompaniment tone string is generated uniformly according to a series of chord data strings. The accompaniment sound sequence may be unnatural in terms of hearing.

  The present invention has been made to address the above-described problems, and an object of the present invention is to provide an accompaniment sound sequence generation program and an accompaniment sound sequence for generating an accompaniment sound sequence having a natural flow based on a series of chord data sequences. It is to provide a generation device.

  In order to achieve the above object, a feature of the present invention is that a code data supplying step for supplying a code data string representing a series of chords and extracting a predetermined reference pitch related to the code for each of the supplied code data A reference pitch extraction step, and a section generation step of generating a series of chord progression sections by dividing the extracted series of reference pitches into a plurality of chord progression sections in which each reference pitch sequentially proceeds in a series of flows. And an accompaniment sound sequence generation program including an accompaniment sound sequence generation step for generating accompaniment sound sequence data representing an accompaniment sound sequence based on a reference pitch for each chord progression section.

  In this case, the reference pitch extraction means extracts, for example, a chord constituent sound as a reference pitch. In particular, it is preferable to extract a root tone (or a bass tone in the case of an on-bass chord) from chord constituent sounds. In the section generation step, for example, a range in which a plurality of extracted reference pitches change within a predetermined pitch can be set as a chord progression section.

  In the feature of the present invention configured as described above, the extracted series of reference pitches is divided into a plurality of chord progression sections in which each reference pitch sequentially advances in a series of flows, An accompaniment sound string is generated for each section based on the reference pitch. Thereby, the state of chord progression is taken into consideration, and an accompaniment sound string that naturally changes in perception is generated.

  Another feature of the present invention is that the accompaniment sound sequence generating step shifts the pitch of the accompaniment sound that does not fall within the predetermined range in the accompaniment sound sequence generated based on the reference pitch sequence, and puts it in the predetermined range. A pitch correction step for correcting the pitch to enter is included. In this case, for an accompaniment sound that is out of a predetermined range, for example, an octave shift may be performed so as to fall within the predetermined range. According to this, since all the accompaniment sounds always fall within the predetermined range, it is possible to easily avoid overlapping with other performance sounds.

  Another feature of the present invention is that the accompaniment sound sequence generation step is performed according to the accompaniment sound sequence candidate generation step of generating a plurality of accompaniment sound sequence candidates and the pitches of the accompaniment sounds constituting the plurality of accompaniment sound sequence candidates. Alternatively, an accompaniment sound string selection step of selecting one accompaniment sound string from a plurality of accompaniment sound string candidates according to a melody sound string corresponding to the chord data string is included.

  In this case, the accompaniment sound sequence selection step includes, for example, selecting an accompaniment sound sequence candidate in which a plurality of accompaniment sounds constituting the accompaniment sound sequence candidate falls within a predetermined range, or an accompaniment sound sequence in which an accompaniment sound outside the predetermined range appears most slowly It is preferable to select a candidate or an accompaniment sound string candidate that has the fewest accompaniment sounds out of a predetermined range. Further, it is also possible to set an optimum range for the accompaniment sound sequence that is narrower than the predetermined range, and to select an accompaniment sequence candidate that has a high frequency of accompaniment sounds that belong to this optimum range. Furthermore, if an accompaniment sound string candidate that does not overlap the melody sound string corresponding to the chord data string is selected, or if there are multiple accompaniment sound string candidates that do not overlap the melody sound string, an accompaniment sound string candidate close to the melody sound string It is good to select.

  According to such another feature of the present invention, an accompaniment sound string suitable as an accompaniment sound is selected, or an accompaniment sound string suitable for a melody sound string is selected. A column is generated.

  The present invention can be configured and implemented not only as a computer program invention but also as an apparatus and method invention.

  Hereinafter, an electronic music apparatus to which an accompaniment sound string generation program and an accompaniment sound string generation device according to an embodiment of the present invention are applied will be described. FIG. 1 is a block diagram schematically showing this electronic music apparatus. The electronic music apparatus includes a keyboard-type electronic musical instrument, a non-keyboard-type electronic musical instrument (an electronic musical instrument having a touch plate, a push button, a string, etc. as a performance operator), an automatic performance apparatus (sequencer apparatus), and a personal having an automatic performance function. A computer can be considered.

  This electronic music apparatus has an input operator group 11, a display 12, and a musical tone signal generation circuit 13. The input operator group 11 includes a plurality of operators for instructing the operation of the electronic music apparatus, and the operations of the plurality of operators are detected by a detection circuit 14 connected to the bus 20. The plurality of operators include a switch operator, a volume operator, a mouse, and the like. In a keyboard type electronic musical instrument, a white key and a black key are also included. The display 12 includes a liquid crystal display, a CRT, and the like, and displays characters, numbers, figures, and the like. The display mode of the display 12 is controlled by a display control circuit 15 connected to the bus 20.

  The musical tone signal generation circuit 13 is connected to the bus 20 and forms a musical tone signal based on performance data supplied under the control of a CPU 31 to be described later, and gives an effect to the musical tone signal thus formed. Output to the sound system 16. The sound system 16 includes a speaker, an amplifier, and the like, and generates a tone corresponding to the tone signal from the tone signal generation circuit 13.

  The electronic music apparatus includes a CPU 31, a timer 32, a ROM 33, and a RAM 34 that are connected to the bus 20 and constitute a microcomputer main body, and also includes an external storage device 35 and a communication interface circuit 36. . The external storage device 35 includes various recording media such as a hard disk HD preinstalled in the electronic music device, a compact disc CD that can be mounted on the electronic music device, and a flexible disk FD, and a drive unit for each of the recording media. It is possible to store and read a large amount of data and programs. In the present embodiment, the hard disk HD stores a plurality of song data in addition to various programs including the accompaniment data generation program of FIG. 2 (including the chord progression section processing routine of FIG. 3). These programs and a plurality of song data are stored in advance on the hard disk HD, supplied to the hard disk HD from a compact disk CD, flexible disk FD, etc., or externally via an external device 41 or a communication network 42 to be described later. It is supplied to HD.

  The plurality of pieces of music data can automatically play music pieces, and each piece of music data includes at least a melody data string and a chord data series together with the music name of the music piece. The melody data string is a sequence of a plurality of note data representing pitches and note lengths of melody sounds according to the progression of music (that is, the passage of time). The chord data string is obtained by arranging chord data representing a series of chords in accordance with the progression of music (that is, the passage of time), that is, corresponding to the melody data string. The code data string represents a code name such as F #, E, F # / E and a code length (a code length). Note that F # / E represents an on-base code having the E sound as a base sound.

  Next, the operation of the embodiment configured as described above will be described. First, the user operates the input operator group 11 to cause the CPU 31 to execute the accompaniment data generation program of FIG. The execution of this program is started in step S10 of FIG. 2, and a user setting process is executed in step S12. In the user setting process, the user is allowed to select music data, and the user is allowed to set the bass range, the bass string selection condition, and the like as necessary. In the selection of song data, the user operates the input operator group 11 while looking at a song name list composed of a plurality of song names displayed on the display device 12, and sets a plurality of sets stored in the external storage device 35. One piece of music data is designated from the music data. As a result, one designated piece of music data is read from the external storage device 35 and written to the RAM 34.

  If the song data desired by the user is not stored in the external storage device 35, the desired song data is read from the external device 41 storing other song data or communicated via the communication interface circuit 36. Desired music data may be read from the outside via the interface circuit 36 and the communication network 42 and written to the RAM 34. Further, performance data based on actual performance may be written into the RAM 34 as music data from the input operator group 11 or the external device 41.

  In setting the bass range, the user inputs the lower limit pitch and the upper limit pitch of the allowable range of the bass sequence that is finally determined using the input operator group 11. In setting the bass tone string selection condition, the user inputs an upper limit pitch and a lower limit pitch of an optimum bass range, which will be described in detail later, using the input operator group 11. In this case, as the bass range, for example, a range of about 2 octaves defined by the lower limit pitch A # 0 and the upper limit pitch A2 is appropriate. As the optimum bass range, a range of one octave defined by the lower limit pitch F1 and the upper limit pitch E2 is appropriate. If the user does not input these bass range and bass tone string selection conditions, a predetermined default value may be adopted. Further, the input processing of the bass sound range and the bass sound string selection condition may be omitted, and a predetermined default value may be always adopted.

  After the process of step S12, in step S14, using the chord data string representing a series of chords written in the RAM 34, reference pitch string data representing the reference pitch string composed of the root sounds of each chord is generated. To do. However, in an on-base code (for example, F # / E) in which an on-base sound is designated, the on-base sound has a reference pitch (for example, an E sound in the case of F # / E). For example, if the chord progression is F # 6, E, F # / E, D # m7, G # m7, C # m7, D # sus4, D # ... The reference pitch columns are F #, E, E, D #, G #, C #, D #, D #,. Here, the octave information is omitted for simplicity.

  Next, in step S16, a section in which the reference pitch is smoothly transitioned using the reference pitch data string is defined as a chord progression section, and a chord data string for each chord section is generated. In this case, first, in the reference pitch sequence, a pitch difference representing a pitch difference from the previous note by a semitone interval is calculated. However, the pitch difference from the previous reference pitch is within one octave, and the smaller of the two upper and lower directions is adopted, with the upper direction being positive and the lower direction being negative. However, the pitch difference for the first reference pitch is not calculated. In this case, for example, if the reference pitch sequence is F #, E, E, D #, G #, C #, D #, D #,... , F #, E (-2), E (0), D # (-1), G # (5), C # (-7), D # (2), D # (0). . Next, in order to set a smoothly changing range as a chord progression section, a reference pitch string whose pitch difference is within a predetermined value (in this embodiment, an absolute value of “2” or less) is a chord progression section. Then, in the above example, the following first to third chord progression sections are defined. The code data string in the first chord progression section is F #, E (-2), E (0), D # (-1), the code data string in the second chord progression section is G #, and the third code The code data string in the progress section is C #, D # (2), D # (0),. However, in each chord progression section, the leading reference pitch is irrelevant to the previous reference pitch with respect to the pitch difference, so that the pitch difference is not shown.

  Next, the chord progression section processing routine of step S18 for determining the bass tone string is executed. This chord progression section processing routine is executed for each chord progression section, and its execution is started in step S30 as shown in detail in FIG. After the execution of this chord progression section processing routine is started, a plurality of bass tone string candidates are generated for one chord progression section using the reference pitch data string included in the chord progression section in step S32. In the generation of this bass tone string candidate, the first pitch note belonging to the base pitch range (A # 0 to A2 in this embodiment) and in the reference pitch sequence of the chord progression section is determined as the leading bass note. Then, a plurality of bass tone string candidates are generated by successively setting the pitches that change in pitch differences in the chord data string generated in step S14 as subsequent bass sounds. In this case, since the bass range is for two octaves, two leading bass sounds are determined, and two bass tone strings are generated. This will be explained by increasing the chord data strings F #, E (-2), E (0), D # (-1) in the first chord progression section. The first bass tone string is F # 1, E1, E1, and D # 1, and the second bass sound string is F # 2, E2, E2, and D # 2.

  Next, in step S34, it is checked whether all the bass sounds in the generated first and second bass tone strings are in the bass range (A # 0 to A2 in this embodiment), and the process goes to step S36. Then, based on the result of the examination, the number of bass tone strings that fall within the bass tone range is determined. In this case, there is only one bass tone string in which all the bass sounds fall within the bass range, no bass tone string where all the bass sounds fall within the bass range, and a bass where all the bass sounds fall within the bass range. There are three cases where there are multiple sound strings. Regarding the explanation regarding these cases, since no characteristic appears in the above-described example of the bass sound string, description will be given while giving examples of other bass sound strings.

  First, a case where there is only one bass sound string in which all bass sounds fall within the bass range will be described. In this case, the process proceeds to step S38 by the determination process in step S36, and the bass sound string in which all the bass sounds enter the bass sound range is set as the determined bass sound string in step S38. Specifically, if the reference tone string of one chord progression section is E, F # (2), G # (2), A # (2), G # (-2), the first bass string is E1. , F # 1, G # 1, A # 1, and G # 1, and the second base column is E2, F # 2, G # 2, A # 2, and G # 2. In this case, all the bass sounds in the first bass sound string are in the bass sound range, but the bass sound A # 2 in the second bass sound string exceeds the bass sound range. Therefore, the first bass tone string is made the final bass tone string by the processing of steps S36 and S38.

  Next, a case where there is no bass tone string in which all bass sounds fall within the bass range will be described. In this case, the processes of steps S40 and S42 are executed by the determination process of step S36. In step S40, the bass sound string in which the bass sound out of the bass sound range appears most slowly from the beginning is selected. Note that instead of the processing in step S40, a bass sound string having the smallest number of bass sounds outside the bass sound range may be selected. Then, in step S42, the bass sound that is out of the bass range is octave shifted so that all bass sounds are in the bass range, and the bass sequence including the octave shifted bass tone is determined as the final determined bass tone. A column.

  Specifically, the reference tone string of one chord progression section is G, A (2), B (2), A (-2), G (-2), F (-2), E (-1). , D (−2), C (−2), B (11), A (−2), and G (−2), the first bass sound string is G1, A1, B1, A1, G1, F1. , E1, D1, C1, B0, A0, G0, and the second bass string is G2, A2, B2, A2, G2, F2, E2, D2, C2, B1, A1, G1. In this case, the bass sounds A0 and G0 in the first bass tone string exceed the bass range, and the bass sound B2 in the second bass tone string also exceeds the bass range. Since the bass sound A0 in the first bass sound string is the eleventh bass sound and the bass sound B2 in the second bass sound string is the third bass sound, the first bass sound is obtained by the process of step S40. The sequence is determined as the final bass sequence. Then, by the processing of step S42, the bass sound exceeding the bass range (basic tone A0, G0 in the above example) is shifted octave in the determined first bass tone string, and the final determined bass tone string is , G1, A1, B1, A1, G1, F1, E1, D1, C1, B0, A1, and G1.

  Next, a case where there are a plurality of bass sound strings in which all bass sounds fall within the bass range will be described. In this case, by the determination process of step S36, the process after step S44 is executed and the bass sound string that matches the melody sound string is set as the determined bass sound string. To explain with a specific example, the reference tone string of one chord progression section is F #, G # (2), A (1), B (2), C # (2), B (-2), If A (-2), G # (-1), F # (-2), G # (2), A (1), and B (2), the first bass tone string is F # 1, G # 1, A1, B1, C # 2, B1, A1, G # 1, F # 1, G # 1, A1, B1, and the second bass sound sequence is F # 2, G # 2, A2, B2, C # 3, B2, A2, G # 2, F # 2, G # 2, A2, and B2. In this case, since all the bass sounds of both bass sound strings are in the bass range, the processing from step S44 onward is executed by the determination processing in step S36.

  In step S44, using the melody data string transferred and stored in the RAM 34, the lowest tone in the melody tone string corresponding to one chord length (note length) is detected for each chord. Next, in step S46, the number of bass sound strings including a bass sound exceeding the lowest sound of the melody sound string, that is, the number of bass sound strings not overlapping the melody sound string is checked. In this case, there are three cases where there is only one bass sound string that does not overlap with the melody sound string, there is no bass sound string that does not overlap with the melody sound string, and there are a plurality of bass sound strings that do not overlap with the melody sound string. There is a case.

  First, a case where there is only one bass tone string that does not overlap with the melody tone string will be described. In this case, by the processing in step S48, the one bass sound string that does not overlap the melody sound string in step S50 is set as a final determined bass sound string.

  Next, a case where there is no bass tone sequence that does not overlap with the melody tone sequence will be described. In this case, the processes of steps S52 and S54 are executed by the determination process of step S48. In step S52, the number of bass sounds in which the bass sound falls within the optimum bass range is examined for each bass tone string. In step S54, the bass sound string having the maximum number of bass sounds falling within the optimum bass sound range is set as the final determined bass sound string. This specific example will be described with an example in which the optimum bass range is F1 to E2. For example, the reference tone string of one chord progression section is C #, D # (2), E (1), F # (2), G # (2), F # (-2), E (-2 ), D # (-1), C # (-2), D # (2), E (1), F # (2), the first bass sound sequence is C # 1, D # 1, E1, F # 1, G # 1, F # 1, E1, D # 1, C # 1, D # 1, E1, F # 1, and the second bass sound sequence is C # 2, D # 2, E2 , F # 2, G # 2, F # 2, E2, D # 2, C # 2, D # 2, E2, and F # 2. Here, there are four bass sounds F # 1, E1, D # 1, and F # 1 belonging to the optimum bass range in the first bass tone sequence, and belong to the optimum bass range in the second bass tone sequence. There are eight bass sounds, C # 2, D # 2, E2, E2, D # 2, C # 2, D # 2, and E2. Therefore, in this case, the second bass sound string is determined as the final bass sound string.

  Not only this, but also taking into account the length (note length) of each bass sound (each chord), the bass sound string having the maximum total length of the bass sounds belonging to the optimum bass range is finalized. It may be determined as a bass sound string. Considering the number of bass sounds belonging to one chord progression section, the ratio of the number or total length of bass sounds belonging to the optimal bass sound to the number or total length of all bass sounds belonging to the same chord progression section May be determined as the final bass tone string.

  Next, a case where there are a plurality of bass sound strings that do not overlap with the melody sound string will be described. In this case, by the process of step S48, the higher bass sound string is set as the determined bass sound string in step S56. Then, after the bass tone string is determined in steps S38, S42, S50, S54, and S56, the chord progression section processing routine is terminated in step S58. Then, when the processing relating to all chord progression sections is completed, the process proceeds to the accompaniment data generation program of FIG. 2, and after executing the process of step S20, the execution of the accompaniment data generation program is terminated in step S22. .

  In step S20, accompaniment sound data that includes a base sound generation timing and represents a bass sound that is actually sounded using a bass sound string for each chord progression section generated by repetitive execution of the chord progression section processing routine. Is generated for each chord progression section. And the accompaniment sound data produced | generated for every chord progression area are connected, and the accompaniment sound data for 1 music are produced | generated. In this case, by referring to the chord data string used to generate the bass sound string, the chord length corresponding to each bass sound is referred to. Accompaniment data to be generated at timing (for example, quarter note timing) is generated. Specifically, as shown in FIG. 4A, if the chord length of the chord corresponding to the bass sound is equal to all notes, accompaniment data for generating the same bass sound at every quarter note timing is created. The Further, as shown in FIG. 4B, if the note length of the chord corresponding to the bass sound is a quarter note, accompaniment data for generating the determined bass sound as it is is created.

  In the generation of the accompaniment sound data, accompaniment pattern data that specifies only the sound generation timing of the bass sound is prepared corresponding to the selected music piece, and the sound generation timing of the accompaniment pattern data is determined as described above. You may make it produce accompaniment data by adapting a bass sound sequence. Further, a chord constituent sound different from the reference pitch may be generated as a bass sound or an accompaniment sound. In this case, data for specifying the pitch of the chord constituent sound and the root note that are generated for each chord type and the sound generation timing of the chord constituent sound are stored, and the reference pitch is set as the root note at the specified timing. It is also possible to generate accompaniment sound data representing a bass sound or accompaniment sound by converting the pitch of the pitch of the pitch. In this case, the data for designating the sounding timing may be omitted, and accompaniment sound data representing a bass sound or accompaniment sound that is sounded at every predetermined timing (for example, a quarter note) may be generated. In addition, the number of accompaniment sounds generated at one time may be generated as well as accompaniment sound data for simultaneously generating a plurality of chord constituent sounds. For example, accompaniment sound data for generating a plurality of chord constituent sounds (for example, a bass sound and a chord sound) may be generated simultaneously with the bass sound or at different timings.

  Then, the accompaniment data generated as described above is supplied to the musical tone signal generation circuit 13 along with the melody data or independently of the melody data, and automatically played. Further, using this accompaniment data, the accompaniment sound string (bass sound string) is displayed in the form of a score on the display 12 together with the melody sound string or independently of the melody sound string, or by a printing device provided separately. You may make it print with the form of a score with a melody sound sequence or independently of a melody sound sequence. Further, the generated accompaniment data may be used for a performance guide for instructing the user of a key to be pressed corresponding to the accompaniment sound by lighting a lamp.

  As can be understood from the above description of operation, according to the above-described embodiment, the reference pitch sequence is extracted based on the chord data sequence by the processing of steps S14 and S16, and the extracted series of reference pitches is obtained from each reference tone. The high is divided into a plurality of chord progression sections that proceed sequentially with a series of flows. Then, by executing the chord progression section processing routine of step S18, a bass tone string is determined based on the reference pitch for each chord progression section, and accompaniment sound data is generated based on this bass tone string by the process of step S20. Is done. As a result, according to the above-described embodiment, an accompaniment sound string that naturally changes in audibility is generated in consideration of the state of chord progression.

  Further, in the chord progression section processing routine, a plurality of bass tone string candidates are generated by the process of step S32, and the pitches of the bass sounds constituting the plurality of bass tone string candidates are processed by steps S34 to S42. A bass sound string that is considered and falls within a predetermined bass sound range is set as a final bass sound string. Further, with the processing in step S42, the pitch of the bass sound that is out of the bass range is octave shifted and stored in the bass range. As a result, according to this, since all the accompaniment sounds always enter the bass range, it is possible to easily avoid overlapping with other performance sounds, and an accompaniment sound string suitable as an accompaniment sound can be obtained. Will be selected.

  In addition, when there are a plurality of bass tone string candidates in which all the bass sounds fall within the bass tone range by the processes of steps S36 and S44 to S56, the bass tone string is determined in consideration of the compatibility with the melody tone string. The In particular, a bass sound string that does not overlap with the melody sound string is determined, and an accompaniment sound string candidate close to the melody sound string is selected. Further, the bass sound string is determined by the frequency of the bass sound that enters the optimum bass sound string. As a result, an accompaniment sound string suitable as an accompaniment sound is selected, or an accompaniment sound string suitable for a melody sound string is selected, so that an accompaniment sound string that changes naturally in terms of hearing is generated.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment and its modifications, and various modifications can be made without departing from the object of the present invention.

  In the above embodiment, the bass sound string is determined in consideration of the melody sound string, but the bass sound string may be determined using only the chord data string. In this case, in the chord progression section processing routine of FIG. 3, when the processing of steps S44 to S54 is omitted and there are a plurality of bass strings in which all the bass sounds fall within the bass range, the determination processing of step S36 The bass sound determination process in step S56 may be executed.

  In the above-described embodiment, two bass sound strings are generated by the process of step S32. However, only one bass sound string may be generated. In this case, it is checked in step S36 whether or not all the bass sounds belonging to the generated one bass sound string are in the bass range, and if all the bass sounds are in the bass range, the bass is processed by the process in step S38. What is necessary is just to determine a sound string. If there is a bass sound that does not fall within the bass range, the bass sound that does not fall within the bass range is corrected to enter the bass range by the processing of step S42, and the revised bass tone string is converted into the final bass range. What is necessary is just to determine as a sound sequence. Also, three or more bass sound strings may be set. In this case, the bass sound range is expanded, or chord constituent sounds other than the root sound (or the bass sound in the case of the on-bass chord) are also selected as the bass sounds for constituting the bass sound string.

  Further, in the above embodiment, when any bass sound in the generated bass tone string candidate is out of the bass range, the pitch of the corresponding bass tone is shifted by an octave so as to enter the bass range. I made it. However, instead of this, the corresponding bass sound may enter the bass range by shifting the pitch by a predetermined pitch. Also, bass sounds that are not in the bass range may be left as they are. Furthermore, it is only necessary to allow the user to select to keep the pitch shift of the bass sound and the pitch of the bass sound as they are in step S12 of the above embodiment.

  Furthermore, in the above embodiment, when there are a plurality of bass tone string candidates in which all the bass sounds belong to the bass tone range, one bass tone string is determined by the processing in steps S44 to S56. However, if a bass tone string that contains many bass sounds with the same pitch name as the melody tone names included in the melody tone string is finally determined as the bass tone string, or if other accompaniment tone strings exist It is also possible to adopt a bass sound string determination method that changes to the processing of steps S44 to S56, such as determining a bass sound string in consideration of compatibility with the accompanying musical sound string.

1 is an overall block diagram of an electronic music apparatus according to an embodiment of the present invention. It is a flowchart which shows the accompaniment data generation program performed with the said electronic music apparatus. It is a flowchart which shows the detail of the chord progression area process routine of FIG. (A) (B) is a figure which shows the example of the bass sound by the produced | generated accompaniment data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Input operator group, 12 ... Display, 13 ... Musical tone signal generation circuit, 31 ... CPU, 33 ... ROM, 34 ... RAM, 35 ... External storage device, 36 ... Communication interface circuit

Claims (4)

A code data supply step for supplying a code data string representing a series of codes;
A reference pitch extraction step for extracting a predetermined reference pitch related to a chord for each of the supplied chord data;
A section generating step for generating a series of chord progression sections by dividing the extracted series of reference pitches into a plurality of chord progression sections in which each reference pitch sequentially proceeds in a series of flows;
An accompaniment sound sequence generation program comprising: an accompaniment sound sequence generation step for generating accompaniment sound sequence data representing an accompaniment sound sequence based on a reference pitch for each chord progression section. The accompaniment sound sequence generation step includes:
A pitch correction step for correcting the pitch of an accompaniment sound that does not fall within a predetermined range in the accompaniment pitch sequence generated based on the reference pitch sequence so as to be within the predetermined range; The accompaniment sound sequence generation program according to claim 1. The accompaniment sound sequence generation step includes:
An accompaniment sound sequence candidate generating step for generating a plurality of accompaniment sound sequence candidates;
One accompaniment sound string is selected from the plurality of accompaniment sound string candidates according to the pitch of the accompaniment sound constituting the plurality of accompaniment sound string candidates or according to the melody sound string corresponding to the chord data string. An accompaniment sound string generation program according to claim 1, further comprising an accompaniment sound string selection step. Code data supply means for supplying a code data string representing a series of codes;
Reference pitch extraction means for extracting a predetermined reference pitch related to a chord for each of the supplied chord data;
Section generating means for generating a series of chord progression sections by dividing the extracted series of reference pitches into a plurality of chord progression sections in which each reference pitch proceeds sequentially with a series of flows;
An accompaniment sound string generation device comprising accompaniment sound string generation means for generating accompaniment sound string data representing an accompaniment sound string based on a reference pitch for each chord progression section.

Images