JP2021124688A - Baseline sound automatic generation device, electronic musical instrument, baseline sound automatic generation method, and program - Google Patents

Abstract

To provide an electronic musical instrument that can automatically perform a baseline with user's performance, a baseline generation method, and a program, and to automatically generates a good baseline having musical continuity and not being monotonous.SOLUTION: Chord data is acquired per measure or per beat of a measure, and based on the chord data, at least any processing among semitone processing (S404), scale sound processing (S405), chord sound processing (S406), or route sound processing (S407) is determined and executed (S401, S402, S403). A baseline is generated based on the acquired chord data and executed processing, and a musical sound of baseline accompaniment in accordance with the generated baseline is sounded.SELECTED DRAWING: Figure 4

Description

The present invention relates to an automatic bass line sound generator capable of automatically generating a bass line, an electronic musical instrument, an automatic bass line sound generation method, and a program.

In a conventional electronic musical instrument, the value of a parameter is set while supplying a parameter for, for example, a bass line accompaniment pattern for at least one of pitch length, strength, pitch change direction, pitch change width, and note attribute. There is known a technique for creating a baseline accompaniment pattern so that a desired accompaniment sound is generated at a desired time based on this parameter (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-175263

However, in the baseline accompaniment pattern generated by the above-mentioned conventional technique, the accompaniment data pre-programmed via the parameters is repeatedly reproduced, and the parameters are changed by the user's intention or probability. Although it is possible to change the accompaniment pattern, it is not possible to perform automatic accompaniment with the ad-lib effect found in, for example, jazz bassline accompaniment, and therefore the performance is heard mechanically. There was a challenge.

An object of the present invention is to automatically generate a good baseline.

In one example of the embodiment, the processor of the automatic baseline sound generator determines which beat timing in the bar corresponds to the generated sound, and the determined beat timing is the first beat timing. In this case, the chord is executed when the root note processing for generating the root note of the chord data associated with the timing of the first beat is executed, and the timing of the determined beat is the timing of a beat other than the first beat. A process determined probabilistically from a plurality of processes including a process based on data is executed.

According to the present invention, it is possible to automatically generate a good baseline.

It is a block diagram which shows the configuration example of the system hardware of an electronic musical instrument. It is operation explanatory drawing of this embodiment. It is a main flowchart which shows an example of the whole processing. It is a flowchart which shows the example of the pitch determination processing. It is a flowchart which shows an example of a semitone processing execution judgment processing, chord sound processing execution judgment processing, and root sound processing. It is a flowchart which shows the example of a semitone processing. It is a flowchart which shows the example of the scale sound processing execution judgment processing. It is a flowchart which shows the example of scale sound processing. It is a flowchart which shows the example of chord sound processing. It is a flowchart (the 1) which shows the example of the octave sound processing. It is a flowchart (2) which shows an example of an octave sound processing. It is a figure which shows the example of the scale sound determination table. It is a figure which shows the example of the chord sound determination table.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration example of the system hardware of the first embodiment 100 of the electronic musical instrument.

The electronic musical instrument 100 is, for example, an electronic keyboard instrument, and is a keyboard 105 composed of a plurality of keys as a performance operator, power on / off of the electronic musical instrument 100, volume adjustment, specification of a tone color of a musical sound output, and automatic bass line accompaniment. A switch for instructing various settings such as the tempo of the instrument, a switch 107 for adding a performance effect, a bend wheel, a pedal, etc., and an LCD (Liquid Crystal Display) 109 for displaying various setting information. Be prepared. Further, the electronic musical instrument 100 is provided with a speaker 113 for emitting a musical sound generated by the performance on the back surface portion, the side surface portion, the back surface portion, or the like of the housing.

Further, in the electronic musical instrument 100, a key scanner 106 and a switch 107 to which a CPU (processor) 101, a ROM (read-only memory), a RAM (random access memory) 103, a sound source LSI (large-scale integrated circuit) 104, and a keyboard 105 are connected. The I / O interface 108 to which the LCD 109 is connected, the LCD controller 110 to which the LCD 109 is connected, and the network interface 114 that captures music data such as MIDI (Musical Instrument Digital Interface) from an external network are connected to the system bus 115, respectively. ing. Further, a D / A converter 111, an amplifier 112, and a speaker 113 are sequentially connected to the output side of the sound source LSI 104.

The CPU 101 executes the control operation of the electronic musical instrument 100 of FIG. 1 by executing the control program stored in the ROM 102 while using the RAM 103 as the work memory. In addition to the control program and various fixed data, the ROM 102 stores song data including, for example, jazz baseline data.

At this time, the CPU 101 captures the performance data played by the user on the keyboard 105 via the key scanner 106 and the system bus 115, generates note-on data and note-off data according to the performance, and outputs the data to the sound source LSI 104. As a result, the sound source LSI 104 generates / outputs or ends the output of the musical sound waveform data corresponding to the input note-on data and note-off data. The musical tone type data output from the sound source LSI 104 is converted into an analog musical tone type signal by the D / A converter 111, amplified by the amplifier 112, and emitted from the speaker 113 as a musical tone played by the user.

Further, in parallel with the sound emitting operation of the performance music sound, the CPU 101 specifies, for example, a jazz music specified by the user from the ROM 102 via the system bus 115 and from the switch 107 via the I / O interface 108 and the system bus 115. The chord data for automatically accompaniment of the baseline is sequentially input, the note number of the baseline is sequentially determined based on the chord data, and the note-on data or note-off data of the note number is sequentially generated to generate the sound source. Output to LSI 104. As a result, the sound source LSI 104 generates / outputs the baseline musical waveform data corresponding to the input bassline automatic accompaniment sound, or ends the output. The baseline musical tone data output from the sound source LSI 104 is converted into an analog musical tone signal by the D / A converter 111, amplified by the amplifier 112, and automatically accompanied by the user from the speaker 113 according to the playing musical tone. It is emitted as a baseline musical tone.

The sound source LSI 104 has an ability to oscillate a maximum of 256 voices at the same time, for example, in order to simultaneously output the performance musical tone and the bassline automatic accompaniment sound.

The key scanner 106 constantly scans the keyed / released state of the keyboard 105, interrupts the CPU 101, and transmits the state change.

The I / O interface 108 constantly scans the operating state of the switch 107, interrupts the CPU 101, and transmits the state change.

The LCD controller 110 is an IC (integrated circuit) that controls the display state of the LCD 505.

The network interface 114 is connected to, for example, the Internet or a local area network, and can acquire the control program, various music data, automatic performance data, etc. used in the present embodiment and store them in the RAM 103 or the like.

The operation outline of the electronic musical instrument 100 shown in FIG. 1 will be described with reference to the operation explanatory diagram of FIG. In the present embodiment, for example, a jazz bassline accompaniment sound can be automatically generated and emitted in accordance with the performance by the user on the keyboard 105.

At this time, the CPU 101 acquires chord data from, for example, ROM 102 for each bar or each beat of the bar, and based on the chord data, at least one of half-tone processing, scale sound processing, chord sound processing, and root sound processing. Is determined and executed, a baseline is generated according to the acquired code data and the executed process, and the sound source LSI 104 is instructed to produce a sound according to the generated baseline.

Semitone processing is also called a chromatic approach in musical terms, and the pitch of a note to be pronounced at a certain timing is pronounced at the pitch above or below a semitone of the note to be pronounced at the timing following that certain timing. It refers to processing. Performing semitone processing results in the use of non-tonal notes, leading to dissonance, which adds a musical spice.

The scale sound processing is to process a plurality of consecutive notes at different timings such as each beat timing in a bar in order from a plurality of pitches (scale sounds) set at a predetermined pitch. It refers to the process of sounding at each pitch of the ascending line (transitioning to the treble side in order) or the descending line (transitioning to the bass side in order), for example, in synchronization with each beat timing. The scale (scale) is, for example, an arrangement of sounds in ascending or descending order according to pitch, based on tonality such as major and minor, and music theory such as symmetrical, pentatonic, and blue note.

The chord sound processing is a process of producing a sound at the pitch included in the constituent notes of the chord.

The root note processing is a process in which the root note of the chord constituent notes is pronounced.

The combination of semitone processing, scale sound processing, chord sound processing, and root sound processing described above is a bassline-specific playing method along the chord progression, for example, when a jazz bassline is played.

In the ROM 102 of FIG. 1, for example, chord data for, for example, 8 bars (the number of bars is arbitrary) as illustrated in FIG. 2A is stored in association with a plurality of bars or, for example, a strong beat in the bar. Has been done. FIG. 2B is a diagram showing an example of a data structure of each code data corresponding to FIG. 2A which is sequentially read from the ROM 102. Each row from top to bottom of the table shown in FIG. 2B shows code data sequentially read from the ROM 102 over time. Each chord data has a "bar" item value indicating the bar number in which the chord data is set, a "beat" item value indicating the beat in which the chord data is set, and a "beat" item value. It includes a "root" item value indicating the pitch of the root note of the chord indicated by the chord data and a "chord type" item value indicating the chord type of the chord indicated by the chord data.

Whether or not the CPU 101 executes semitone processing, scale sound processing, chord sound processing, and root sound processing by an algorithm consisting of the following judgments 1 to 3 at the timing of each beat in each bar that progresses in time. To judge.

First, as processing determination 1 (step S401), the CPU 101 obtains the current beat from the ROM 102 as a weak beat (for example, the second or fourth beat in the current bar in the fourth beat) and the current beat. If the chord data to be obtained is not set and the chord data acquired from the ROM 102 is set to the beat next to the current beat, it is probabilistically determined to execute the half-tone processing for the current beat. And execute half-beat processing. Here, "probabilistically" means, for example, by generating a random number and comparing the value of the random number with a certain threshold value, if it is small, the execution of semitone processing is determined, and if it is large, the execution of semitone processing is executed. It means to perform the process of not determining.

When the CPU 101 does not determine the execution of the semitone processing in the processing determination 1, the current beat is the first beat of the current measure and the current beat is 1 of the current measure as the processing determination 2 (step S402). When chord data is not set for beats other than the beat, it is probabilistically determined to execute the scale sound processing for the first beat of the current bar, and the scale sound processing is executed. Further, if the current beat is not the first beat of the current bar, and if the CPU 101 has already determined to execute the scale sound processing for the first beat of the current bar, the CPU 101 refers to the current beat. Determines to execute the scale sound processing, and executes the scale sound processing.

When the CPU 101 does not determine the execution of the scale sound processing in the processing determination 2, the current beat is a beat other than the first beat of the current bar as the processing determination 3 (step S403), and the current beat is present. When the chord data is not set for the beat of, the execution of the chord sound processing is determined for the current beat, and the chord sound processing is executed.

When the CPU 101 does not determine the execution of the chord sound processing in the processing determination 3, the CPU 101 determines the execution of the root sound processing and executes the root sound processing. In principle, the root note processing is executed at the timing of the beat to which the chord data is associated.

The CPU 101 performs semitone processing, scale sound processing, chord sound processing, or root for the code data sequentially acquired from the ROM 102, for example, as shown in FIGS. 2A and 2B, based on the above processing determinations 1 to 3. One of the sound processes is executed to generate a baseline accompaniment sound as illustrated in FIG. 2 (c).

For example, when the CPU 101 acquires the code data of CM7 at the first beat of the first bar of FIG. 2C, the processing judgment 1 is NO, the processing judgment 2 is NO, and the processing judgment 3 is NO, and as a result, the root sound. Decide to execute the process. When the CPU 101 decides to execute the root sound processing, the CPU 101 determines the pitch of the root sound of the currently set chord data as the output pitch of the current beat. That is, the CPU 101 determines the pitch C of the root note of the chord data CM7 currently set in the first beat of the first bar as the output pitch of the first beat of the first bar.

For example, the CPU 101 processes the root sound for each of the first beats of the second, fourth, fifth, sixth, and eighth measures of FIG. 2C and the third beat of the sixth measure in the same manner as described above. As a result of deciding to execute and executing the root note processing, the pitch A of each root note of each chord data Am7, G7, Em7, Am7, and G7 and D7 set in the first beat of each measure , G, E, A, and G, and D are determined as each output pitch.

For example, in the second beat and the third beat of the first bar of FIG. 2C, the CPU 101 sets NO for the processing determination 1 and 1 of the second bar because no code data is set for each next beat. Since the execution of the scale sound processing is not judged at the beat, the processing judgment 2 is also NO, and the processing judgment 3 is YES because the chord data is not set for the beat, and the execution of the chord sound processing is decided respectively. Perform chord sound processing. When the CPU 101 decides to execute the chord sound processing, the number of the current beat in the current measure and the pitch of the beat before the current beat correspond to the constituent sounds of the current chord. The root pitch, the 3rd pitch, the 5th pitch, or the 7th pitch, which corresponds to the constituent pitch of the current chord, which is probabilistically determined according to the root pitch, the 3rd pitch, the 5th pitch, or the 7th pitch. , Or the pitch calculated based on any note type of the 7th pitch is determined as the output pitch of the current beat. That is, the CPU 101 sets the constituent sounds E and G of the chord CM7 set for the first bar as the second and third beats of the first bar, respectively, at the second and third beats of the first bar. It is determined as each output pitch of.

The CPU 101 also determines the execution of chord sound processing in the same manner as above for the second and third beats of the second, fourth, fifth, and eighth measures, respectively, and as a result, the chord sound processing is executed. G and E, D and F, B and E, and D and B are determined as the respective output pitches as the second and third beats of the second, fourth, fifth, and eighth measures, respectively. .. Further, the CPU 101 is a weak beat for the 4th beat of the 6th bar, and no chord data is set for that beat, and chord data is set for the 1st beat of the next 7th bar. However, processing judgment 1 is NO, processing judgment 2 is also NO because the execution of scale sound processing is not judged in the first beat of the sixth bar, and processing judgment 3 is YES because no chord data is set for that beat. Then, the execution of the chord sound processing is determined, and the chord sound processing is executed. As a result, the CPU 101 determines the constituent sound C of the chord D7 as its output pitch as the fourth beat of the sixth bar.

Regarding the 4th beat of the 1st bar, the CPU 101 has a weak beat, no chord data is set for that beat, and chord data is set for the 1st beat of the 2nd bar following the beat. Is set, the execution of the half-tone processing is probabilistically determined, and the half-tone processing is executed. When the pitch of the note information of the beat immediately before the current beat is one pitch below or above the pitch of the root of the chord of the next beat of the current beat, the CPU 101 determines the next beat. The pitch above the root pitch of the chord is determined as the output pitch of the current beat. Alternatively, when the pitch of the note information of the beat immediately before the current beat is the pitch of the root of the chord of the next beat of the current beat, the CPU 101 is next The pitch below the root of the chord of the beat is determined as the output pitch of the current beat. Alternatively, the CPU 101 determines that the pitch of the note information of the beat immediately before the current beat is a semitone below, above, above, below, and above a semitone with respect to the pitch of the root of the chord of the next beat of the current beat. In the case of neither of the above, the pitch of either a semitone above or below a semitone with respect to the pitch of the root of the chord of the next beat is probabilistically determined as the output pitch of the current beat. That is, in the CPU 101, the pitch G of the note information of the third beat immediately before the fourth beat of the first bar, which is the current beat, is the pitch G following the fourth beat of the first bar, which is the current beat. Since it is all pitches below the pitch A of the root of the chord Am7 of the first beat of the second bar, it is half a pitch below the pitch A of the root of the chord Am7 of the first beat of the second bar, which is the next beat. Pitch G # is determined as the output pitch of the 4th beat of the first bar.

The CPU 101 also performs E ♭, D #, B ♭, A for the 4th beat of the 2nd, 4th, 5th, 7th, and 8th measures and the 2nd beat of the 6th measure in the same manner as described above. ♭, C #, and C # are determined as each output pitch.

Since the CPU 101 is a strong beat for the first beat of the third bar, the processing judgment 1 is NO, the processing judgment 2 is, and the chord data is stored in the first beat and the beats other than the first beat in the third bar. Since it is not set, it is probabilistically determined to execute the scale sound processing for the first beat of the third bar, and the scale sound processing is executed. Further, the second beat of the third bar is a weak beat, and the chord data is not set for that beat, but the chord data is not set for the next third beat, so the processing judgment 1 is NO. Since the processing determination 2 has already determined that the scale sound processing is to be executed for the first beat of the third bar instead of the first beat, the scale sound processing is executed. As for the 3rd beat of the 3rd bar, the processing judgment 1 is NO and the processing judgment 2 is the processing judgment 2 because it is a strong beat, and the scale sound processing is executed not for the 1st beat but for the 1st beat of the 3rd bar. Since it has already been determined, scale sound processing is executed. Further, the 4th beat of the 3rd bar is a weak beat, and the chord data is not set for that beat, but the chord data is set for the 1st beat of the next 4th bar. When the processing determination 1 is stochastically NO, the processing determination 2 already determines the execution of the scale sound processing for the first beat of the third bar, so the scale sound processing is executed.

When the CPU 101 decides to execute the scale sound processing, each pitch constituting the scale according to the chord type indicated by the chord data set in the first beat of the current bar is set to one beat of the current bar. Based on the pitch of the eye, each pitch is determined as each output pitch for each beat in the current bar in either the ascending or descending direction with the passage of time. That is, the CPU 101 sets each pitch D, E, F, G in the ascending direction of the third bar, which constitutes a scale corresponding to the chord type m7 indicated by the chord data Dm7 of the first beat of the third bar. It is determined as each pitch of the first beat, the second beat, the third beat, and the fourth beat.

The CPU 101 also determines the execution of the scale sound processing with the processing determination 1 being NO and the processing determination 2 being YES for the first beat, the second beat, and the third beat of the seventh bar in the same manner as described above. Perform scale sound processing. That is, the CPU 101 sets each pitch D, C, and B in the descending direction, which constitutes a scale corresponding to the chord type m7 indicated by the chord data Dm7 of the first beat of the seventh bar, to one beat of the seventh bar. It is determined as the pitch of each of the second, second, and third beats. The CPU 101 is a weak beat for the 4th beat of the 7th bar, and the chord data is not set for that beat, but the chord data is set for the 1st beat of the next 8th bar. Process judgment 1 is probabilistically YES. Therefore, for the fourth beat of the seventh bar, the CPU 101 determines the execution of the semitone processing as described above, executes the semitone processing, and determines A ♭ as the output pitch.

As described above, in the present embodiment, when the accompaniment sound of the jazz bassline is reproduced from the chord data of the automatic performance, the semitone processing, the scale sound processing, the chord sound processing, and the root sound processing peculiar to the bass line are performed. It is possible to automatically execute the chord progression playing method by the combination of. As a result, in the present embodiment, the bassline is generated from one type of chord data string with various accompaniment patterns, so that it is possible to enjoy the automatic accompaniment of the bassline that will not get tired no matter how many times you listen.

In addition, once the execution of semitone processing or scale sound processing is determined, for example, a state in which the execution is not determined by a state probabilistically determined by a random number and a frequency threshold is generated, so that the baseline It is possible to add more various changes to the automatic accompaniment.

FIG. 3 is a main flowchart showing an example of an overall process, which is a process of executing a control process read from the ROM 102 to the RAM 103 by the CPU 101 in the embodiment of the electronic musical instrument 100 of FIG. The processing of this main flowchart is started, for example, by the performer pressing the power switch included in the switch 107 of FIG.

First, the CPU 101 executes an initialization process (step S301 in FIG. 3). In the initialization process, the CPU 101 first resets the ticktime that controls the progress of the automatic accompaniment of the baseline, the number of measures, and the number of beats. In the present embodiment, the progression of the baseline automatic accompaniment proceeds in units of the value of the TickTime variable stored in the RAM 103 of FIG. 1 (hereinafter, the value of this variable is referred to as “TickTime” which is the same as the variable name). In the ROM 102 of FIG. 1, the value of the TimeDivision constant (hereinafter, the value of this variable is referred to as "TimeDivision" which is the same as the variable name) is preset, and this TimeDivision has a resolution of one beat (for example, a quarter note). If this value is, for example, 96, one beat has a time length of 96 × TickTime. Here, how many seconds 1 Tick Time actually becomes depends on the tempo specified for the song data. Now, if the value set in the Tempo variable on the RAM 203 according to the user setting is Tempo [beat / minute], the number of seconds of TickTime = TickTimeSec [second] is calculated by the following equation (1).

TickTimeSec [seconds] = 60 / Tempo / TimeDivision
... (1)

Therefore, in the initialization process of step S301 of FIG. 3, the CPU 101 calculates TickTimeSec [seconds] by the arithmetic process corresponding to the above equation (1), sets it in the hardware timer in the CPU 101 (not particularly shown), and sets it. Reset the TickTime variable value on the RAM 103 to 0. The hardware timer generates an interrupt every time the TickTimeSec [seconds] set above elapses. As the value of Tempo set in the variable Tempo, a predetermined value read from the constant of ROM 102 in FIG. 1, for example, 60 [beat / sec] may be initially set in the initial state. Alternatively, the variable Tempo may be stored in the non-volatile memory, and the Tempo value at the time of the previous termination may be held as it is when the power of the electronic musical instrument 100 is turned on again.

In the initialization process of step S301 of FIG. 3, the CPU 101 also resets the value of the variable indicating the number of measures on the RAM 103 to the value 1 indicating the first measure, and sets the value of the variable indicating the number of beats on the RAM 103 to one beat. Reset to the value 1 indicating the eye.

Further, in the initialization process of step S301 of FIG. 3, the CPU 101 acquires the code data for automatic baseline accompaniment exemplified in FIG. 2B from the ROM 102 and stores it in the RAM 103.

After that, the CPU 101 repeatedly executes a series of processes from steps S302 to S308 in FIG. In this series of processes, the CPU 101 first executes a pitch determination process (step S302). In this pitch determination process, the CPU 101 determines the output pitch and the corresponding note number for the current beat by executing the above-mentioned semitone processing, scale sound processing, chord sound processing, or root sound processing. The details of the pitch determination process will be described later using the flowchart of FIG.

In the above series of processes, the CPU 101 then executes a note-on process (step S303 in FIG. 3). In this note-on process, the CPU 101 has note-on data having a note number value corresponding to the current beat of the baseline determined in the pitch determination process of step S302 and a velocity value separately determined (for example, a fixed value). Is generated, and the note-on data is transferred to the sound source LSI 104 of FIG. As a result, the sound source LSI 104 starts generating the musical sound form data of the baseline accompaniment having the note number and velocity corresponding to the note-on data, and emits sound from the speaker 113 via the D / A converter 111 and the amplifier 112. .. Further, in this note-on processing, the CPU 101 captures the playing state of the key 105 of FIG. 1, and when a key is pressed by the user on the key 105, the CPU 101 has a note number value and a velocity value corresponding to the key pressed. Note-on data is generated, and the note-on data is transferred to the sound source LSI 104 of FIG. As a result, the sound source LSI 104 starts generating the musical sound waveform data of the user performance having the note number and velocity corresponding to the note-on data, and emits sound from the speaker 113 via the D / A converter 111 and the amplifier 112. In the sound source LSI 104, the generation of each musical sound form data of one or more key presses by the baseline accompaniment and the user performance can be simultaneously executed by the time division processing in different sounding channels, and the D / A converter. Sound can be simultaneously emitted from the speaker 113 via the 111 and the amplifier 112.

In the above series of processes, the CPU 101 next determines whether or not an interrupt of TickTimeSec [seconds] has occurred from the above-mentioned hardware timer, and if the interrupt occurs, the TickTime value, which is a variable on the RAM 103, is counted up. (Step S304 in FIG. 3).

In the above series of processes, the CPU 101 next determines whether or not the note-off timing has been reached (step S305 in FIG. 3). Specifically, for example, as a result of counting up the TickTime value in step S304, the CPU 101 determines whether a fixed time = 90 TickTime, which is slightly shorter than one beat, has elapsed from the issuance of the note-on data of the accompaniment sound of the corresponding baseline, for example. judge. Alternatively, for example, the CPU 101 captures the playing state of the keyboard 105 of FIG. 1 and determines whether or not a key release has occurred for a key pressed by the user on the keyboard 105.

If the determination in step S305 is YES, the CPU 101 executes the note-off process (step S306). Specifically, the CPU 101 generates, for example, note-off data corresponding to the note-on data of the corresponding baseline accompaniment sound, and outputs the note-off data to the sound source LSI 104. As a result, the sound source LSI 104 finishes generating the musical sound form data of the baseline accompaniment that was being generated, and silences the sound emitted from the speaker 113. Alternatively, for example, the CPU 101 generates note-off data corresponding to the note-on data of the user playing sound corresponding to the key release operation by the user on the keyboard 105, and outputs the note-off data to the sound source LSI 104. As a result, the sound source LSI 104 finishes the generation of the musical sound waveform data by the user performance that was being generated, and silences the sound emitted from the speaker 113.

If the determination in step S305 is NO, the CPU 101 does not execute the note-off process in step S306.

In the above series of processing, the CPU 101 next determines whether or not the TickTime variable value on the RAM 103 reaches the above-mentioned TimeDivision constant value (= 96TickTime value), that is, whether or not the count by the TickTime variable value advances by one beat. Is determined (step S307 in FIG. 3).

If the determination in step S307 is NO, the CPU 101 returns to the process of step S304 in FIG. 3 and further counts up the TickTime value.

When the determination in step S307 becomes YES, the CPU 101 resets the TickTime variable value, increments the value of the variable indicating the number of beats on the RAM 103 by +1 and further resets the value of the variable to 1 when the value exceeds 4. At the same time, the value of the variable indicating the number of measures on the RAM 103 is incremented by 1 (step S308 in FIG. 3). After that, the CPU 101 returns to the pitch determination process in step S302 of FIG.

FIG. 4 is a flowchart showing a detailed example of the pitch determination process in step S302 of FIG. First, the CPU 101 determines whether or not to execute the semitone processing (step S401), and if the determination in step S401 is YES, executes the semitone processing in step S404.

If the determination in step S401 is NO, the CPU 101 determines whether or not to execute the scale sound processing (step S402), and if the determination in step S402 is YES, the CPU 101 executes the scale sound processing in step S405.

If the determination in step S402 is NO, the CPU 101 determines whether or not to execute the chord sound processing (step S403), and if the determination in step S403 is YES, the CPU 101 executes the chord sound processing in step S406 and determines in step S403. If is NO, the root sound processing of step S407 is executed.

In any of the processes of steps S404, S405, S406, and S407, the CPU 101 should cause the sound source LSI 104 to generate the musical sound form data of the baseline accompaniment at the timing of the current beat of the current bar (C). ~ B: The value is determined from 0 to 11).

The CPU 101 executes an octave process after any of the processes of steps S404, S405, S406, and S407 (step S408). In this octave process, the CPU 101 sets the note values of C to B (values 0 to 11) determined above to the notes having a value in the range of 0 to 127 set in the note-on data actually instructed by the sound source LSI 104. Convert to a number (MIDI note number) (step S408). After that, the CPU 101 ends the pitch determination process in step S302 of FIG.

FIG. 5A is a flowchart showing a detailed example of the semitone processing execution determination processing for performing the determination in step S401 of FIG. The processing of this flowchart corresponds to the operation of the processing determination 1 in the operation outline of the electronic musical instrument 100 described above.

In the semitone processing execution determination process of FIG. 5A, the CPU 101 first sets a variable value indicating the number of beats on the RAM 103 set in steps S301 and S308 of FIG. 3 corresponding to the current beat as the second beat or It is determined whether or not any of the fourth beats, the so-called weak beat, is exhibited (step S501 in FIG. 5A).

If the determination in step S501 is NO, that is, if the current beat is a so-called strong beat, the CPU 101 proceeds to the scale sound processing determination process in step S402 of FIG. 4 without determining the execution of the semitone process.

If the determination in step S501 is YES, that is, if the current beat is a weak beat, the CPU 101 determines whether or not the code data is set in the current beat (step S502). Specifically, the CPU 101 is a variable value indicating the number of measures on the RAM 103 and a variable value indicating the number of beats set in steps S301 and S308 of FIG. 3 corresponding to the current measure and the current beat, and is a variable value indicating the number of beats. The chord data is set to the current beat depending on whether or not the "bar" item and the "beat" item of the chord data exemplified in FIG. 2B acquired from the ROM 102 to the RAM 103 in step S301 of the above can be searched. Judge whether or not it has been done.

If the determination in step S502 is YES, that is, the current beat is a weak beat, but the chord data is set for the current beat, the CPU 101 does not determine the execution of the semitone processing, and the figure shows the figure. The process proceeds to the scale sound processing determination process in step S402 of step 4.

If the determination in step S502 is NO, that is, if the current beat is a weak beat and the chord data is not set, it is determined whether or not the chord data is set in the beat next to the current beat. (Step S503). Specifically, the CPU 101 applies 1 to the variable value indicating the number of measures and the variable value indicating the number of beats on the RAM 103 corresponding to the current measure and the current beat, as in the update process of step S308 of FIG. Whether or not the "bar" item and the "beat" item of the code data exemplified in FIG. 2B acquired from the ROM 102 to the RAM 103 in step S301 of FIG. 3 could be searched with the variable value updated by the beat. It is determined whether or not the chord data is set in the beat next to the current beat.

If the determination in step S503 is NO, that is, if the current beat is a weak beat and the chord data is not set, and the chord data is not set for the beat next to the current beat, the CPU 101 Does not determine the execution of the semitone processing, and proceeds to the scale sound processing determination processing in step S402 of FIG.

If the determination in step S503 is YES, the CPU 101 generates a random number value (code random value) in the range of 0 to 99 as the variable value x on the RAM 103 (step S504).

The CPU 101 determines whether or not the random value generated in step S504 is smaller than the semitone frequency variable on the RAM 103 indicating the frequency of semitone processing (step S505). This semitone frequency variable is a threshold for controlling whether or not to execute the semitone processing with a certain probability. For example, if the value of the semitone frequency variable is 0, the probability that the semitone processing is executed becomes 0%, and the semitone processing is executed. If the value of the frequency variable is 100 or more, there is a 100% chance that the semitone processing will be executed. For example, in a jazz bassline, semitone processing is often used, so the value of this semitone frequency variable may be increased (to a value close to "99") so that semitone processing is executed almost every time. .. Further, the value of this semitone frequency variable may be changed according to the tempo set by the user with the switch 107 of FIG. For example, when the tempo is fast, the time to stay in a semitone is short (because the note length is short), and it is difficult to break the tonal feeling. Therefore, the value of the semitone frequency variable may be increased. Further, the value of the semitone frequency variable may be changed depending on the tune. For example, in pop music, the value of the semitone frequency variable is lowered so that the tonal feeling is not lost, and in jazz, it is raised. Furthermore, the user may be able to specify the value of the semitone frequency variable in real time.

When semitone processing is performed, dissonance occurs due to the use of non-tonal notes. When the generated bass line is jazz-like, the frequency of dissonance may be increased as compared with the case of pop-like. Similarly, in the case of a song with a fast tempo, the frequency of occurrence of dissonance may be increased as in the case of a song with a slow tempo. According to the present invention, it is an advantage that a good baseline suitable for a genre, a tempo, etc. can be generated by changing a random variable value according to a genre, a tempo, or the like.

If the determination in step S505 is NO, the CPU 101 probabilistically proceeds to the scale sound processing determination process in step S402 of FIG. 4 without determining the execution of the semitone process.

If the determination in step S505 is YES, the execution of the semitone processing is stochastically determined, and the process proceeds to the semitone processing in step S404 of FIG.

By the semitone processing execution determination processing exemplified in the flowchart of FIG. 5A, the function of the processing determination 1 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized.

FIG. 6 is a flowchart showing a detailed example of the semitone processing in step S404 of FIG. First, the CPU 101 acquires the root of the code (value from 0 to 11) indicated by the code data next to the currently set code data. Specifically, the CPU 101 obtains the "root" item value (see FIG. 2B) of the code data of the beat next to the current beat searched in step S503 of the semitone processing execution determination processing of FIG. 5A. get.

Next, the CPU 101 acquires the note number of the note-on-data that is instructed to pronounce in the previous beat stored in the RAM 103 (step S602).

Explaining the above-mentioned steps S601 and S602 by using, for example, the above-mentioned example of the chord progression of FIG. 2C, if the present is the fourth beat of the first measure, the CPU 101 will perform the second measure in step S601. The value of the root A of the chord Am7 of the first beat is acquired, and the note number (0 to 127) of the note-on-data whose sound is instructed in the third beat of the first bar in step S602 is acquired.

Next, the CPU 101 calculates the difference value between the two by subtracting the root value acquired in step S601 from the note number of the previous beat acquired in step S602 (step S603). By executing the arithmetic processing of the following equation (2), the CPU 101 ensures that the difference value becomes a positive value and is rounded to the range of 0 to 11. "%" Indicates a multiplier operation.

(Previous note number-root value +12)% 12 ... (2)

Subsequently, the CPU 101 determines whether or not the difference value calculated in step S603 is any of 11 or 2 (step S604).

If the determination in step S604 is YES, the CPU 101 sets the value obtained by adding +1 to the root value acquired in step S601 as the note value of the current beat (step S608). When the difference value is 11, it means that the pitch of the note number of the beat immediately before the current beat is a semitone below the root of the chord of the next beat of the current beat, and the note number of the previous beat. Since it is not possible to take the pitch between the root of the chord of the next beat and the root of the chord of the next beat, it is possible to move from the note number of the previous beat to the root of the chord of the next beat from the raised pitch to the root of the next beat. That is, in order to play a semitone in the opposite direction so that the same note value does not continue, the pitch obtained by adding +1 to the pitch of the root of the chord of the next beat is the note value of the current beat. It is said that. On the other hand, when the difference value is 2, it means that the pitch of the note number immediately before the current beat is on the whole note of the chord root of the next beat of the current beat. In order to take the pitch between the pitches of, the pitch obtained by adding +1 to the pitch of the root of the chord of the next beat is taken as the note value of the current beat.

If the determination in step S604 is NO, the CPU 101 determines whether or not the difference value calculated in step S603 is any of 10 or 1 (step S605). If the determination in step S605 is YES, the CPU 101 sets the value obtained by subtracting -1 from the root value acquired in step S601 as the note value of the current beat (step S609). When the difference value is 10, it means that the pitch of the note number of the beat immediately before the current beat is the whole pitch of the chord of the chord of the next beat of the current beat, and these are applied to the current beat. In order to take a pitch between the pitches of, the pitch obtained by -1 from the pitch of the root of the chord of the next beat is taken as the note value of the current beat. On the other hand, when the difference value is 1, it means that the pitch of the note number immediately before the current beat is a semitone above the root of the chord of the next beat of the current beat, and the note number of the previous beat. Since the pitch between That is, in order to play a semitone in the opposite direction so that the same note value does not continue, the pitch obtained by -1 from the pitch of the root of the chord of the next beat is the note of the current beat. It is a value.

If the determination in step S605 is NO, the CPU 101 generates a random number value in the range of 0 to 99 as the variable value x on the RAM 103 (step S606).

The CPU 101 determines whether or not the random number value generated in step S606 is smaller than the semitone upper tone frequency variable on the RAM 103 indicating the frequency of the semitone upper tone (step S607). In the semitone processing, this semitone above frequency variable is set to the pitch above the semitone with respect to the root of the chord of the next beat of the current beat as the note value of the current beat (whether step S608 is executed). ) Or a semitone below the pitch (whether step S609 is executed). For example, if the value of the semitone above frequency variable is set to about 70, it is a semitone above the semitone. The frequency of transitioning from to the root of the chord of the next beat is about twice as high. The value of this semitone upper tone frequency variable may be a preset value or a value that can be edited by the user.

If the determination in step S607 is YES, the CPU 101 executes the process of step S608 described above. On the other hand, if the determination in step S607 is NO, the CPU 101 executes the process of step S609 described above.

After the process of step S608 or S609, the CPU 101 rounds the note value calculated in step S608 or S609 into a value range of 0 to 11 so that the output note value has a pitch within one octave. Execute (step S610). The CPU 101 converts the note value into a value 11 when it becomes a value -1, and converts it into a value 0 when it becomes a value 12. After that, the CPU 101 ends the semitone processing of step S404 of FIG. 4 shown in the flowchart of FIG.

By the semitone processing exemplified in the flowchart of FIG. 6 above, the function of the semitone processing executed based on the processing determination 1 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized. As a result, as described above in the chord progression example of FIG. 2C, for example, the 4th beat of the 1st, 2nd, 4th, 5th, 7th, and 8th measures and the 2nd beat of the 6th measure. For the eyes, G #, E ♭, D #, B ♭, A ♭, C #, and C # note values are output by semitone processing.

FIG. 7 is a flowchart showing a detailed example of the scale sound processing execution determination processing for making the determination in step S402 of FIG. The processing of this flowchart corresponds to the operation of the processing determination 2 in the operation outline of the electronic musical instrument 100 described above.

In the scale sound processing execution determination process of FIG. 7, the CPU 101 first determines whether or not the variable value indicating the number of beats on the RAM 103 corresponding to the current beat indicates the first beat (step S701).

If the determination in step S701 is YES, that is, if the current beat is the first beat, the CPU 101 determines whether or not the chord data is set for a beat other than the first beat of the current bar (step). S702). Specifically, the CPU 101 is a variable value indicating the number of measures on the RAM 103 corresponding to the current measure, and is the code data exemplified in FIG. 2 (b) acquired from the ROM 102 to the RAM 103 in step S301 of FIG. Searches for the "bar" item of, and determines whether or not there is code data in which the "beat" item value other than the value 1 is set in the search result.

If the determination in step S702 is YES, the CPU 101 does not determine the execution of the scale sound processing, turns off the variable value of the scale flag on the RAM 103 (value 0) (step S706), and then turns off (value 0) (step S706), and then steps S403 in FIG. Proceed to the chord sound processing execution judgment processing.

If the determination in step S702 is NO, the CPU 101 generates a random number value (scale random value) in the range of 0 to 99 as the variable value x on the RAM 103 (step S703).

The CPU 101 determines whether or not the random number value generated in step S703 is smaller than the scale frequency variable on the RAM 103 indicating the frequency of scale sound processing (step S704). The value of this scale sound processing frequency variable may be a preset value or a value that can be edited by the user.

If the determination in step S704 is YES, the CPU 101 stochastically determines the execution of the scale sound processing for the first beat of the current bar, and turns on the variable value of the scale flag on the RAM 103 (value 1). After that (step S705), the process proceeds to the scale sound processing of step S405 of FIG.

If the determination in step S704 is NO, the CPU 101 stochastically does not determine the execution of the scale sound processing for the first beat of the current bar, and turns off the variable value of the scale flag on the RAM 103 (to the value 1). After that (step S706), the process proceeds to the chord sound processing execution determination process in step S403 of FIG.

If the determination in step S701 described above is NO, that is, if the current beat is not the first beat of the current measure, the CPU 101 has already determined that the scale sound processing is executed for the first beat of the current measure. It is determined whether or not the scale flag is set to on (value 1) (step S707).

If the determination in step S707 is YES, the CPU 101 decides to execute the scale sound processing, and performs the scale sound processing in step S405 of FIG. 4 with respect to the second, third, or fourth beats that are the current beats. Run.

If the determination in step S707 is NO, the CPU 101 does not determine the execution of the scale sound processing, and the chord sound processing in step S403 of FIG. 4 is performed with respect to the current beats 2, 3, or 4. Executes the execution judgment process.

By the scale sound processing execution determination processing exemplified in the flowchart of FIG. 7 above, the function of the processing determination 2 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized.

FIG. 8 is a flowchart showing a detailed example of the scale sound processing in step S405 of FIG. First, the CPU 101 determines whether or not the current beat is the second beat, that is, whether or not the variable value indicating the number of beats on the RAM 103 corresponding to the current beat indicates the second beat (step S801). ).

If the determination in step S801 is NO because the current beat is the first beat, the CPU 101 first acquires the root and chord type of the current code data set in the first beat (step S802). Specifically, the CPU 101 has a variable value indicating the number of measures on the RAM 103 corresponding to the current measure and the current beat and a variable value indicating the number of beats (this value is 1 because it is the first beat), and is the step of FIG. In S301, the "bar" item and the "beat" item of the code data exemplified in FIG. 2B acquired from the ROM 102 to the RAM 103 are searched, and the "root" item value and the "code" of the searched code data are searched. Get the "type" item value. The CPU 101 stores the "root" item value and the "code type" item value of the acquired current code data in the RAM 103.

Subsequently, the CPU 101 determines whether or not the current beat is the first beat (step S803). Now, since the current beat is the first beat, the determination in step S803 is YES. As a result, the CPU 101 outputs the "root" item value of the current code acquired in step S802 and stored in the RAM 103 as a note value (step S804). The CPU 101 stores this note value in the RAM 103. After that, the CPU 101 ends the scale sound processing of step S405 of FIG. 4 shown in the flowchart of FIG.

If the determination in step S801 is YES because the current beat is the second beat, the CPU 101 executes a series of processes from steps S805 to S811 for determining whether to perform the scale sound processing upward or downward. do.

First, the CPU 101 acquires the note value (0 to 127) after the octave processing in step S408 (step S805).

Next, the CPU 101 determines whether or not the note value of the first beat acquired in step S805 is less than C2 (36) (step S806).

If the determination in step S806 is YES, the CPU 101 sets a value indicating ascending as the ascending / descending variable value on the RAM 103 (step S810). After that, the CPU 101 proceeds to the process of step S812.

If the determination in step S806 is NO, the CPU 101 determines whether or not the note value of the first beat acquired in step S805 is G2 (43) or more (step S807).

If the determination in step S807 is YES, the CPU 101 sets a value indicating the descending line as the ascending / descending variable value on the RAM 103 (step S811). After that, the CPU 101 proceeds to the process of step S812.

When the determination in step S807 is NO, that is, when the first beat is C2 or more and less than G2, the CPU 101 stochastically determines whether to go up or down.

That is, the CPU 101 generates a random number value in the range of 0 to 99 as the variable value x on the RAM 103 (step S808).

The CPU 101 determines whether or not the random number value generated in step S808 is larger than the value 49 (step S809). This value 49 may be a value that can be edited by the user.

If the determination in step S809 is YES, the CPU 101 proceeds to step S810 and sets a value indicating ascending as an ascending / descending variable value on the RAM 103. On the other hand, if the determination in step S809 is NO, the CPU 101 proceeds to step S811 and sets a value indicating the descending line as the ascending / descending variable value on the RAM 103.

After the process of step S810 or S811, the CPU 101 proceeds to the process of step S812. In the present embodiment, the ROM 102 of FIG. 1 stores the scale sound determination table exemplified in FIGS. 12 (a) or 12 (b) for each of the above-mentioned ascending or descending lines. The scale sound determination table stores the pitch values from the first beat to the fourth beat for each "chord type". In step S812, the CPU 101 selects the scale sound determination table according to any one of FIGS. 12A or 12B based on the ascending / descending variable values on the RAM 103 set in step S810 or S811, and further. , The current beat and the current beat from the scale sound determination table selected above based on the "code type" item value obtained in the RAM 103 in step S802 and the variable value indicating the number of beats on the RAM 103 corresponding to the current beat. Get the pitch value corresponding to the chord type.

After the process of step S812, the CPU 101 adds the pitch value obtained in step S812 to the "root" item value obtained in the RAM 103 in step S802, and the addition result is C to B (0 to 11). The calculation is performed so as to be rounded to the range of, and the result is output as a note value of the scale sound corresponding to the current beat (step S813). After that, the CPU 101 ends the scale sound processing of step S405 of FIG. 4 shown in the flowchart of FIG.

By the scale sound processing exemplified by the flowchart of FIG. 8 above, the function of the scale sound processing executed based on the processing determination 2 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized. As a result, as described above in the chord progression example of FIG. 2C, for example, the 1st to 4th beats of the 3rd bar and the 1st to 3rd beats of the 7th bar are each subjected to scale sound processing. The note value of the scale sound is output.

FIG. 5B is a flowchart showing a detailed example of the chord sound processing execution determination processing in step S403 of FIG. The processing of this flowchart corresponds to the operation of the processing determination 3 in the operation outline of the electronic musical instrument 100 described above.

In the chord sound processing execution determination process of FIG. 5B, the CPU 101 first determines whether or not the variable value indicating the number of beats on the RAM 103 corresponding to the current beat is other than the first beat (FIG. 5). Step S510 of (b).

If the determination in step S510 is YES, that is, if the current beat is other than the first beat, the CPU 101 determines whether or not the code data is set in the current beat (step S511). Specifically, the CPU 101 acquires a variable value indicating the number of measures on the RAM 103 corresponding to the current measure and the current beat and a variable value indicating the number of beats from the ROM 102 to the RAM 103 in step S301 of FIG. Whether or not the chord data is set for the current beat is determined based on whether or not the "bar" item and the "beat" item of the chord data exemplified in FIG. 2B can be searched.

If the determination in step S511 is NO, that is, if no chord data is set for the current beat other than the first beat, the CPU 101 decides to execute the chord sound processing and executes the chord sound processing in step S406 of FIG. do.

The determination in step S510 is NO, that is, the current beat is the first beat, or the determination in step S511 is YES, that is, the current beat is other than the first beat, but the code data is set in the current beat. In this case, the CPU 101 does not determine the execution of the chord sound processing, determines the execution of the root sound processing, and executes the root sound processing in step S407 of FIG.

FIG. 9 is a flowchart showing a detailed example of the chord sound processing in step S406 of FIG. First, the CPU 101 acquires the note type of the beat before the current beat (step S901). Each time the CPU 101 acquires a note type corresponding to the current beat in step S911 described later in the chord sound processing, the CPU 101 stores the note type corresponding to the beat in a variable in the RAM 103. In step S901, the CPU 101 acquires the note type of the previous beat by referring to the variable value of the note type stored in the RAM 103 with respect to the previous beat. The note type includes a root pitch, a 3rd pitch, a 5th pitch, or a 7th pitch, corresponding to the constituent notes of the current chord.

Next, the CPU 101 executes the following series of processes from steps S902 to S914 to determine the number of the current beat in the current measure and the pitch of the beat before the current beat. The root pitch corresponding to the constituent pitch of the current chord, the root pitch corresponding to the constituent pitch of the current chord, which is probabilistically determined according to which pitch is the 3rd pitch, the 5th pitch, or the 7th pitch. The pitch calculated based on any of the note types of the 3rd pitch, the 5th pitch, and the 7th pitch is determined as the output pitch of the current beat.

First, the CPU 101 acquires the current beat number from the value of the variable indicating the beat number on the RAM 103 (step S902). Here, the ROM 102 of FIG. 1 stores the chord sound determination table exemplified in FIGS. 13 (a) to 13 (d).

When the second beat is acquired in step S902, the CPU 101 selects the chord sound determination table for the second beat in FIG. 13A (step S903).

When the third beat is acquired in step S902, the CPU 101 includes (b-1) and (b-) in FIG. 13 (b) according to the note type of the beat before the current beat acquired in step S901. 2), (b-3), or (b-4), one table is selected from the plurality of chord sound determination tables for the third beat (step S904).

When the fourth beat is acquired in step S902, the CPU 101 includes (c-1) and (c) in FIG. 13 (c) according to the note type of the beat before the current beat acquired in step S901. -2), (c-3), or (c-4), one table is selected from the plurality of chord sound determination tables for the third beat (step S905).

In the subsequent processes S906 to S908, the CPU 101 determines whether the current chord type is a triad or a 4 chord. First, the CPU 101 acquires the code type of the code data currently set from the RAM 103 (step S906). Therefore, the CPU 101 stores the "root" item value and the "code type" item value of the latest acquired code data in each variable on the RAM 103 each time the process of acquiring the code data is executed.

The ROM 102 stores a chord sound determination table in which the difference values from the roots for each chord type and note type (3rd, 5th, and 7th pitches) as illustrated in FIG. 13D are registered. In this table, when the chord type is a triad chord type, -1 is stored as a difference value of note type = 7th. The CPU 101 acquires a difference value in which the note type is 7th by referring to the chord sound determination table exemplified in FIG. 13D using the chord type acquired in step S906 as a key (step S907).

The CPU 101 determines whether or not the difference value acquired in step S907 is -1 (step S908).

When the determination in step S908 is NO, that is, when the chord type acquired in step S906 is a chord type of 4 chords including the 7th pitch, the CPU 101 sets a variable value x on the RAM 103 as a random value in the range of 0 to 99. (Step S909).

If the determination in step S908 is YES, that is, if the chord type acquired in step S906 is a triad chord type that does not include the 7th pitch, the CPU 101 determines the chord sound determination table selected in steps S903, S904, or S905. The maximum value in the setting range corresponding to the 5th (however, when -1 is set in the 5th, the maximum value in the setting range corresponding to the 3rd) is set as y, and the variable value x on the RAM 103 is set. , A random value is generated in the range of 0 to y (step S910).

After the processing of step S909 or S910, the CPU 101 acquires a new note type including the variable value x as the "setting range" item value on the chord sound determination table selected in step S903, S904, or S905 (. Step S911).

Next, the CPU 101 acquires the route of the code data currently set from the RAM 103 (step S912). As described above, the CPU 101 stores the "root" item value and the "code type" item value of the latest acquired code data in each variable on the RAM 103 each time the process of acquiring the code data is executed. ..

The CPU 101 acquires a difference value from the root by referring to the chord sound determination table illustrated in FIG. 13D based on the chord type acquired in step S906 and the note type acquired in step S911. (Step S913).

Finally, the CPU 101 adds the difference value acquired in step S913 to the route value acquired in step S912, calculates so that the addition result is rounded to the range of C to B (0 to 11), and calculates the addition result. The result is output as a note value of the chord sound corresponding to the current beat (step S914). After that, the CPU 101 ends the chord sound processing of step S406 of FIG. 4 shown in the flowchart of FIG.

By the chord sound processing exemplified in the flowchart of FIG. 9 above, the function of the chord sound processing executed based on the processing determination 3 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized. As a result, as described above in the chord progression example of FIG. 2C, for example, the second and third beats and the sixth beat of the first, second, fourth, fifth, and eighth measures, respectively. For the 4th beat of the bar, the note values E and G, G and E, D and F, B and E, D and B, and C of each chord constituent note are output by the chord sound processing.

FIG. 5C is a flowchart showing a detailed example of the root sound processing in step S407 of FIG. First, the CPU 101 acquires a route based on the code data (step S520). Specifically, the CPU 101 has a variable value indicating the number of measures on the RAM 103 corresponding to the current measure and the current beat and a variable value indicating the number of beats (this value is 1 because it is the first beat), and is the step of FIG. In S301, the "bar" item and the "beat" item of the code data exemplified in FIG. 2B acquired from the ROM 102 to the RAM 103 are searched, and the "root" item value of the searched code data is acquired. , Stored in RAM 103.

The CPU 101 outputs the "root" item value of the current code acquired in step S520 and stored in the RAM 103 as a note value (step S521). After that, the CPU 101 ends the root sound processing of step S407 of FIG. 4 shown in the flowchart of FIG. 5 (c).

By the root sound processing exemplified by the flowchart of FIG. 5 (c) above, the function of the root sound processing executed based on the processing determination 3 described in the operation outline of the embodiment of the electronic musical instrument 100 described above is realized. .. As a result, as described above in the chord progression example of FIG. 2C, for example, the first beat of each of the first, second, fourth, fifth, sixth, and eighth measures and the third beat of the sixth measure. For the eyes, the root sounds C, A, G, E, A, G, and D of each chord are output by the root sound processing.

10 and 11 are flowcharts showing a detailed example of the octave processing in step S408 of FIG. In the octave processing described below, the CPU 101 actually instructs the sound source LSI 104 of the C to B (values 0 to 11) note values determined in any of the processes of steps S404, S405, S406, and S407 of FIG. It is converted into a note number (MIDI note number) having a value in the range of 0 to 127 set in the note-on data to be performed. The note number is generated by adding the difference value based on the node number that occurred last time.

First, the CPU 101 determines whether or not the determined sound is the first sound (step S1001).

If the determination in step S1001 is YES, the first note does not have a previous note number, so the CPU 101 determines the note number (E1 to Eb2) based on the note values (C to B) (step S1002).

If the determination in step S1001 is NO, the CPU 101 acquires the previous note number from, for example, a variable in the RAM 103 (step S1003).

Next, the CPU 101 calculates the difference value between the note number of the previous note acquired in step S1003 and the determined note value by the following calculation formula so as to be in the range of 0 to 11 (step). S1004).

Difference value = (previous note number-determined note value + 12)% 12

The CPU 101 adds the previous note number and the difference value calculated in step S1004, and sets the addition result as a new note number (step S1005).

If nothing is done, the value will always be higher than that of the previous note number. Therefore, the CPU 101 executes a process of raising or lowering the octave of the output note number by a series of processes from step S1006 to step 1024 below.

First, the CPU 101 branches and executes each process according to the difference value calculated in step S1004 (step S1006). The meaning of each number of the determination result in the determination of step S1006 is as follows.
0: Same sound 1, 2: 2 degrees above sound 3, 4: 3 degrees above sound 5, 6, 7: 4, 5 degrees above sound 8, 9: 6 degrees above sound 10, 11: 7 degrees above Sound above

In step S1006, when the difference value is 0, the sound is the same, so the sound remains the same, or the octave is raised or lowered with a probability of 50% (steps S1007 to S1010).

First, the CPU 101 generates a random number value in the range of 0 to 99 as the octave determination determination value y, which is a variable on the RAM 103 (step S1007).

The CPU 101 determines whether or not the value of the variable y is less than 50 (step S1008).

If the determination in step S1008 is NO, the CPU 101 proceeds to step S1021 in FIG. 11 without changing the octave.

If the determination in step S1008 is YES, the CPU 101 determines whether or not the previous note is less than C2 (step S1009).

If the determination in step S1009 is YES, the CPU 101 proceeds to step S1020 in FIG. 11 to increase the note number by an octave.

If the determination in step S1009 is NO, it is determined whether or not the previous note is larger than E ♭ 2 (step S1010).

If the determination in step S1010 is YES, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

If the difference value is 1 or 2 in step S1006, the CPU 101 proceeds to step S1021 of FIG. 11 without changing the octave.

When the difference value is 3 or 4 in step S1006, the CPU 101 first generates a random number value in the range of 0 to 99 as the octave determination determination value y, which is a variable on the RAM 103 (step S1011).

The CPU 101 determines whether or not the value of the variable y is less than 75 (step S1012).

If the determination in step S1012 is YES, the CPU 101 proceeds to step S1021 in FIG. 11 without changing the octave.

If the determination in step S1012 is NO, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

When the difference value is 5, 6, or 7 in step S1006, the CPU 101 first generates a random number value in the range of 0 to 99 as the octave determination determination value y which is a variable on the RAM 103 (step S1013). ..

The CPU 101 determines whether or not the previous note is G2 or higher (step S1014).

If the determination in step S1014 is YES, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

If the determination in step S1014 is NO, the CPU 101 determines whether or not the value of the variable y is less than 50 (step S1015).

If the determination in step S1015 is YES, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

If the determination in step S1015 is NO, the CPU 101 proceeds to step S1021 in FIG. 11 without changing the octave.

When the difference value is 8 or 9 in step S1006, the CPU 101 first generates a random number value in the range of 0 to 99 as the octave determination determination value y which is a variable on the RAM 103 (step S1016).

The CPU 101 determines whether or not the previous note is C2 or higher (step S1017).

If the determination in step S1017 is YES, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

If the determination in step S1017 is NO, the CPU 101 determines whether or not the value of the variable y is less than 75 (step S1018).

If the determination in step S1018 is YES, the CPU 101 proceeds to step S1019 in FIG. 11 to octave down the note number.

If the determination in step S1018 is NO, the CPU 101 proceeds to step S1021 in FIG. 11 without changing the octave.

If the difference value is 10 or 11 in step S1006, the CPU 101 proceeds to step S1019 of FIG. 11 to octave down the note number.

The processing after step S1021 in FIG. 11 is a range limit processing. The CPU 101 sets the output range to the range of E1 to G3. If you want to change the sound range, you can change the range E1 to G3.

The CPU 101 determines whether or not the note to be pronounced is smaller than E1 (step S1021).

If the determination in step S1021 is YES, the CPU 101 octaves up the output note (step S1023).

If the determination in step S1021 is NO, the CPU 101 determines whether or not the note to be pronounced is larger than G3 (step S1022).

If the determination in step S1022 is YES, the CPU 101 octaves down the output note (step S1024).

After the processing of step S1023 or S1024, or when the determination of step S1022 is NO, the CPU 101 ends the octave processing of step S408 of FIG. 4 shown in the flowchart of FIG.

By the above octave processing, the higher the difference value between the previous note and the current note, the more the processing for lowering the octave, so that the jump progress (movement in a wide pitch) can be reduced.

In the past, accompaniment performance, in which pre-programmed performance data was repeatedly played for an arbitrary length, is no longer a monotonous repetitive performance by randomizing it within a certain rule, and it becomes a live performance played by humans. It is possible to reproduce the approaching performance.

By incorporating the information of the notes before the timing when the pronunciation has already been completed into the "certain rule" at this time, there is no connection between each note and the pitch is more than the pitch generated by randomization. It is possible to reproduce phrases that have a musical natural connection.

By having a plurality of means for determining the sounding pitch to be randomized, it is possible to reproduce a performance that is closer to a live performance performed by a human being, further away from a monotonous performance.

Even when processing conditions such as semitone processing or scale sound processing are satisfied, it is possible to make a change without probabilistic execution.

In addition, the present invention is not limited to the above-described embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, the functions executed in the above-described embodiment may be combined as appropriate as possible. The above-described embodiments include various steps, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed constitutional requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, the configuration in which the constituent requirements are deleted can be extracted as an invention.

The following additional notes will be further disclosed with respect to the above embodiments.
(Appendix 1)
Determine which beat timing in the bar the generated sound corresponds to, and
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
Bassline sound automatic generator.
(Appendix 2)
The plurality of processes
A chord sound process that generates any of the sounds included in the chord constituent sounds of the acquired chord data.
Multiple sounds with different consecutive sound timings can be selected as either an ascending sound that sequentially transitions to the treble side or a descending sound that sequentially transitions to the bass side within the set multiple pitches. Scale sound processing, which produces the included sounds,
A semitone process that generates a pitch that is either above or below a semitone of the sound to be pronounced at the timing of the next beat after the determined beat timing.
The bassline sound automatic generator according to Appendix 1, which comprises any of the above.
(Appendix 3)
A scale random value is generated when the determined timing of the beat is the timing of the first beat and the code data is not associated with the timing of beats other than the first beat in the measure. Let me
According to the generated scale random value, it is determined whether or not to execute the scale sound processing at the timing of the second and subsequent beats.
When the determined beat timing is a beat timing other than the first beat, and it has already been determined that the scale sound processing is executed at the timing of the second and subsequent beats, the above. Performing the stochastically determined scale sound processing,
The bassline sound automatic generator according to Appendix 2.
(Appendix 4)
When the determined beat timing is a beat timing other than the first beat, and it is determined not to execute the scale sound processing at the timing of the second and subsequent beats, the above-mentioned When it is determined that the chord sound processing is stochastically executed, the chord sound processing is executed according to a different table according to the determined timing of the beat.
The bassline sound automatic generator according to Appendix 3.
(Appendix 5)
When the determined beat timing is a beat timing other than the first beat and the code data is associated with the timing of the next beat after the determined beat timing, the code random value is set. Generate,
It is determined whether to execute the semitone processing or the chord sound processing according to the generated chord random value.
The bassline sound automatic generation device according to any one of Supplementary note 2 to 4.
(Appendix 6)
When the execution of the semitone processing is determined according to the generated chord random value,
The pitch of the note information of the timing of the beat immediately before the determined timing of the beat is one half note below or the pitch of the root note of the chord data associated with the timing of the next beat. In the case of a whole note, the pitch above the root note of the chord data associated with the timing of the next beat is determined as the output pitch at the timing of the beat.
The pitch of the note information of the timing of the beat immediately before the determined timing of the beat is below the pitch of the root note of the chord data associated with the timing of the next beat. In the case of a half note above, the pitch below the root note of the chord data associated with the timing of the next beat is determined as the output pitch of the timing of the beat.
The bassline sound automatic generator according to Appendix 5.
(Appendix 7)
When the automatically generated bass line is jazz-like, the semitone frequency variable value is set so that the probability that the semitone processing is executed is higher than when the automatically generated bass line is pop-like. Yes,
The bassline sound automatic generation device according to Appendix 5 or 6.
(Appendix 8)
A semitone frequency variable value so that when the automatically generated baseline tempo is the first tempo, the probability that the semitone processing is executed is higher than when the tempo is the second tempo, which is slower than the first tempo. Is set,
The bassline sound automatic generation device according to Appendix 5 or 6.
(Appendix 9)
The baseline automatic generator according to any one of Supplementary notes 1 to 8 and
With the performance controller,
With
Executes pronunciation processing according to the operation of the performance operator.
Electronic musical instrument.
(Appendix 10)
For the processor of the automatic bass line sound generator
Lets you decide which beat timing in the bar the generated sound corresponds to.
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
Method.
(Appendix 11)
For the processor of the automatic bass line sound generator
Lets you decide which beat timing in the bar the generated sound corresponds to.
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
program.

100 electronic musical instrument 101 CPU
102 ROM
103 RAM
104 Sound source LSI
105 keyboard 106 key scanner 107 switch 108 I / O interface 109 LCD
110 LCD Controller 111 D / A Converter 112 Amplifier 113 Speaker 114 Network Interface 115 System Bus

Claims (11)

Determine which beat timing in the bar the generated sound corresponds to, and
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
Bassline sound automatic generator. The plurality of processes
A chord sound process that generates any of the sounds included in the chord constituent sounds of the acquired chord data.
Multiple sounds with different consecutive sound timings can be selected as either an ascending sound that sequentially transitions to the treble side or a descending sound that sequentially transitions to the bass side within the set multiple pitches. Scale sound processing, which produces the included sounds,
A semitone process that generates a pitch that is either above or below a semitone of the sound to be pronounced at the timing of the next beat after the determined beat timing.
The bassline sound automatic generation device according to claim 1, which comprises any of the above. A scale random value is generated when the determined timing of the beat is the timing of the first beat and the code data is not associated with the timing of beats other than the first beat in the measure. Let me
According to the generated scale random value, it is determined whether or not to execute the scale sound processing at the timing of the second and subsequent beats.
When the determined beat timing is a beat timing other than the first beat, and it has already been determined that the scale sound processing is executed at the timing of the second and subsequent beats, the above. Performing the stochastically determined scale sound processing,
The bassline sound automatic generation device according to claim 2. When the determined beat timing is a beat timing other than the first beat, and it is determined not to execute the scale sound processing at the timing of the second and subsequent beats, the above-mentioned When it is determined that the chord sound processing is stochastically executed, the chord sound processing is executed according to a different table according to the determined timing of the beat.
The bassline sound automatic generation device according to claim 3. When the determined beat timing is a beat timing other than the first beat and the code data is associated with the timing of the next beat after the determined beat timing, the code random value is set. Generate,
It is determined whether to execute the semitone processing or the chord sound processing according to the generated chord random value.
The bassline sound automatic generation device according to any one of claims 2 to 4. When the execution of the semitone processing is determined according to the generated chord random value,
The pitch of the note information of the timing of the beat immediately before the determined timing of the beat is one half note below or the pitch of the root note of the chord data associated with the timing of the next beat. In the case of a whole note, the pitch above the root note of the chord data associated with the timing of the next beat is determined as the output pitch at the timing of the beat.
The pitch of the note information of the timing of the beat immediately before the determined timing of the beat is below the pitch of the root note of the chord data associated with the timing of the next beat. In the case of a half note above, the pitch below the root note of the chord data associated with the timing of the next beat is determined as the output pitch of the timing of the beat.
The bassline sound automatic generation device according to claim 5. When the automatically generated bass line is jazz-like, the semitone frequency variable value is set so that the probability that the semitone processing is executed is higher than when the automatically generated bass line is pop-like. Yes,
The bassline sound automatic generator according to claim 5 or 6. A semitone frequency variable value so that when the automatically generated baseline tempo is the first tempo, the probability that the semitone processing is executed is higher than when the tempo is the second tempo, which is slower than the first tempo. Is set,
The bassline sound automatic generator according to claim 5 or 6. The baseline automatic generator according to any one of claims 1 to 8.
With the performance controller,
With
Executes pronunciation processing according to the operation of the performance operator.
Electronic musical instrument. For the processor of the automatic bass line sound generator
Lets you decide which beat timing in the bar the generated sound corresponds to.
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
Method. For the processor of the automatic bass line sound generator
Lets you decide which beat timing in the bar the generated sound corresponds to.
When the determined timing of the beat is the timing of the first beat, the root sound processing for generating the root sound of the chord data associated with the timing of the first beat is executed.
When the determined beat timing is a beat timing other than the first beat, a process stochastically determined from a plurality of processes including a process based on the code data is executed.
program.

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