JP4006301B2 - Code detection device for electronic musical instrument, code detection method and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chord detection technique for an electronic musical instrument, and more particularly to a technique for chord detection according to a keyboard operation.
[0002]
[Prior art]
Some electronic musical instruments have a hand keyboard for manual operation and a foot keyboard for foot operation. The hand keyboard is a two-stage keyboard, and the upper keyboard plays the melody line and the lower keyboard plays the chord line. In an electronic musical instrument having an automatic accompaniment function, chord detection is performed according to the operation of the lower keyboard and the foot keyboard, and automatic accompaniment is performed according to the detected chord. An example of a code detection method is described in Japanese Patent Publication No. 5-84920.
[0003]
Codes that are detected include a fraction code (for example, C / B) and a normal code that is not a fraction code. The fractional chord is the chord part code where the numerator chord is the upper part of the score (corresponding to the hand keyboard), and the base part of the base part where the denominator chord is the lower part of the score (corresponding to the foot key) .
[0004]
An electronic musical instrument detects chord root and chord type. If the pitch name of the detected chord root and the key pressed on the foot keyboard are the same, it is detected as a normal chord that is not a fraction chord. On the contrary, when the pitch name of the detected chord root and the key pressed on the foot keyboard are different, it is detected as a fractional chord (for example, C / B). However, the code detected by this method is not perfect, and as a result, it may be detected as an inappropriate code. As a technique for solving this problem, Japanese Patent Laid-Open No. 2002-196755 by the inventor's invention is disclosed.
[0005]
[Problems to be solved by the invention]
In the turning chords such as augment or diminished, chord constituent sounds are formed at the same pitch intervals, and therefore the chord root cannot be specified. For example, in the case of the Cdim code, it is composed of a dummy file #r. In this case, all four constituent sounds can be chord roots, and the chord root is determined according to the intention of the performer. In an electronic musical instrument, the lowest tone of chord constituent sounds is used as a chord root, or the sound of a foot keyboard is mechanically determined as a chord root. Therefore, a chord root different from the player's intention may be determined.
[0006]
For example, when performing chords in the order of C → Caug → F, especially in the case of an organ or the like, in practice, in many cases, it is performed in a reversed form such as Sodomi → So # Domi → Radopha rather than Domiso → Domiso # → Dofara. (In this specification, the lowest note in the chord constituent sounds is indicated on the leftmost side). In this case, when chord detection is performed with an electronic musical instrument, C → G # auug → F is detected, and the player cannot perform the performance desired.
[0007]
Also, when performing detection using a foot keyboard, if the chord is C → Caug → F, the bass route is generally played as C → E → F. Originally, it is appropriate to detect as C → Caug / E → F, but it is erroneously detected as C → Eaug → F, and a preferable code cannot be detected.
[0008]
In addition, if the turning form of So # Domi is also detected as Caug in order to cope with this chord progression, G # auug cannot be detected, and this time, it becomes impossible to respond when the key of the song changes. is there.
[0009]
In addition to the augment and the diminished, since B ♭ and Dm # 5 are chords of the same constituent sound, there is a problem that it is impossible to identify which chord is the chord, and it is only possible to identify the chord according to the frequency of use. For example, when playing with fascination, it is generally B ♭, but for clichés that move from Dm (Farale) to fascination (La #), Dm # 5 is more suitable than B ♭. There is a problem that.
[0010]
In general, it is suitable to detect F # m7、5 by pressing Radomi on the hand keyboard and pressing F # on the foot keyboard. However, in the case of cliché with a bass that is played with A → G # → G → F # while holding Am (Radomi) on the hand keyboard, Am → Am / G # → Am / G → F # m7 ♭ In this case, it is more preferable to detect Am / F # than F # m7 ♭ 5.
[0011]
An object of the present invention is to detect a chord intended by a performer in accordance with the performance flow.
Another object of the present invention is to select the most suitable chord root in the augment.
Yet another object of the present invention is to select the most suitable code root in the diminished.
Yet another object of the present invention is to select the most suitable code in cliché.
[0012]
[Means for Solving the Problems]
  According to one aspect of the present invention, a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation, and a first chord root and a first chord according to the operation of the hand keyboard. A first chord detection unit for detecting the chord type of the second chord, and a second chord according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detection unit for detecting the presence of a route, a second code type, and a base route;, A third chord for detecting the presence or absence of a third chord root, a third chord type, and a base root in accordance with the detected first chord root, first chord type, and operation of the foot keyboard When both the detection unit and the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code type is adopted. A decision unit employing a code route and the third code type;An electronic musical instrument chord detection apparatus is provided.
  According to another aspect of the present invention, a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation, and a first chord root and a first chord according to the operation of the hand keyboard. A first chord detection unit that detects a chord type of the first chord, a first chord root that has been detected, a first chord type, an operation of the foot keyboard, and a chord that has been detected last time; According to the operation of the second chord detector, the second chord type, the base chord route, the detected first chord root, the first chord type, and the foot keyboard, A third code detecting unit for detecting presence / absence of a third code route, a third code type and a base route; and when the second code type and the third code type are both diminished, Code Over preparative and employing the second code type, code detecting device for an electronic musical instrument having a determination unit to adopt the third chord root and said third code type of the provided otherwise.
  Of the present inventionfurtherAccording to another aspect, there is a chord detection method for an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation, and according to the operation of the hand keyboard, A first chord detection step for detecting a first chord root and a first chord type; the first chord root detected; the first chord type; the operation of the foot keyboard; and the chord previously detected And a second code detection step for detecting the presence or absence of a second code route, a second code type and a base route,, A third chord for detecting the presence or absence of a third chord root, a third chord type, and a base root in accordance with the detected first chord root, first chord type, and operation of the foot keyboard When the detection step and both the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code type is adopted. A decision step adopting a code route and said third code type;An electronic musical instrument chord detection method is provided.
  According to still another aspect of the present invention, there is provided a chord detection method for an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation, the operation of the hand keyboard According to the first chord root and the first chord type, a first chord detection step, the detected first chord root, the first chord type, the operation of the foot keyboard, and the previous time A second code detecting step for detecting presence / absence of a second code route, a second code type and a base route according to the detected code; and the detected first code route and first code type. And a third chord detection step for detecting the presence / absence of a third chord root, a third chord type, and a base root in response to the operation of the foot keyboard, and the second chord type and the third chord. Determining whether to adopt the second chord root and the second chord type when both types are diminished, and adopt the third chord root and the third chord type otherwise. An electronic musical instrument chord detection method is provided.
  According to still another aspect of the present invention, there is provided a code detection program for an electronic musical instrument having a performance keyboard for performance operation including a hand keyboard for manual operation and a foot keyboard for foot operation, the operation of the hand keyboard According to the first chord root and the first chord type, a first chord detection step, the detected first chord root, the first chord type, the operation of the foot keyboard, and the previous time A second code detecting step for detecting the presence or absence of a second code route, a second code type and a base route according to the detected code;, A third chord for detecting the presence or absence of a third chord root, a third chord type, and a base root in accordance with the detected first chord root, first chord type, and operation of the foot keyboard When the detection step and both the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code type is adopted. A decision step adopting a code route and said third code type;A program for causing a computer to execute is provided.
  According to still another aspect of the present invention, there is provided a code detection program for an electronic musical instrument having a performance keyboard for performance operation including a hand keyboard for manual operation and a foot keyboard for foot operation, the operation of the hand keyboard According to the first chord root and the first chord type, a first chord detection step, the detected first chord root, the first chord type, the operation of the foot keyboard, and the previous time A second code detecting step for detecting presence / absence of a second code route, a second code type and a base route according to the detected code; and the detected first code route and first code type. And a third chord detection step for detecting the presence or absence of a third chord root, a third chord type and a base root in response to an operation of the foot keyboard, the second chord type and the second chord A decision step of adopting the second code route and the second code type when both of the code types are diminished, and adopting the third code route and the third code type otherwise; A program for causing a computer to execute is provided.
[0013]
According to the present invention, since the current chord is detected not only according to the operation of the performance keyboard but also according to the chord detected last time, the chord intended by the performer according to the performance flow can be detected.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic configuration example of an electronic musical instrument according to an embodiment of the present invention. The electronic musical instrument has a hand keyboard for manual operation and a foot keyboard 2 for foot operation. The hand keyboard is a two-stage keyboard, and has an upper keyboard for playing a melody line and a lower keyboard 1 for playing a chord line.
[0015]
When a key depression operation is performed on the lower keyboard 1, the lower keyboard 1 outputs a key-on event, and when a key release operation is performed on the lower keyboard 1, the lower keyboard 1 outputs a key-off event. The chord determination processing means 4 detects a temporary lower keyboard code root and a temporary lower keyboard code type in response to a key on / off event of the lower keyboard 1.
[0016]
When a key depression operation is performed on the foot keyboard 2, the foot keyboard 2 outputs a key-on event, and when a key release operation is performed on the foot keyboard 2, the foot keyboard 2 outputs a key-off event. The chord determination processing means 4 detects a temporary foot keyboard base route in response to a key on / off event of the foot keyboard 2.
[0017]
Next, the chord determination processing means 4 determines the true chord root and the true chord type according to the temporary lower chord chord root, the lower chord chord type, the foot keyboard base root and the chord detected last time. At the same time, the presence / absence of a base route is determined. Specifically, in the case of augment, diminished, and cliché, code detection is performed according to the code detected last time. When there is a base route, the provisional foot keyboard base route is determined as a true base route and becomes a fraction code. The denominator of the fraction code is the base route, and the numerator is the true code route. If it is determined that there is no base route, it becomes a normal code that is not a fraction code.
[0018]
The style number switch 3 is a switch for selecting an automatic accompaniment style such as rock or jazz, and outputs a style number in accordance with the switch operation.
[0019]
The automatic accompaniment sound processing means 5 reads out an automatic accompaniment pattern corresponding to the style number, and generates an automatic accompaniment according to the true chord root, true chord type, and bass route. Automatic accompaniment is performed, for example, by repeatedly generating a predetermined pattern of drums, chords (piano sound, guitar sound, etc.) and bass. The chord accompaniment is pronounced according to the true chord root and chord type, and the bass accompaniment is pronounced according to the bass root.
[0020]
FIG. 2 shows a specific configuration of the code determination processing means 4 of FIG. Here, a code detection method for general codes other than augment, diminished, and cliché will be described. When three or more sounds are simultaneously pressed on the lower keyboard, it is possible to detect the chord root and chord type based on the key depression. However, if only one or two keys are pressed on the lower keyboard, it is difficult to detect the chord root and chord type based on the key pressed. Perform detection.
[0021]
First, a case where three or more sounds are simultaneously pressed on the lower keyboard will be described. When the key-on / off event of the lower keyboard is input, the first key-on bitmap creating means 11 creates all the key numbers (pitches) that are key-on as pressed by the lower keyboard as the first key-on bitmap. To do. At this time, the bit of the key number that is key-on is set to 1, and the bit of the key number that is key-off is set to 0.
[0022]
The second key-on bitmap creating means 12 detects only the key number in the code detection range from the first key-on bitmap and creates a second key-on bitmap.
[0023]
The temporary chord route creating means 20 detects the lowest tone in the second key-on bitmap as a temporary chord route. On the other hand, the third key-on bitmap creating means 13 creates a third key-on bitmap compressed within one octave based on the second key-on bitmap. That is, it is expressed as a note name within one octave starting from the lowest note as the temporary chord root. At this time, since it is known that the lowest sound as the temporary chord root always has a bit of 1, the third key-on bitmap can be created with 11 bits by omitting the lowest sound bit.
[0024]
The address creating means 14 creates an address necessary for referring to the table based on the third key-on bitmap. As shown in FIG. 3, the table 15 outputs the chord root shift value 102 and the lower keyboard chord type 103 in accordance with the octave map address 101 described above. The determination unit 16 inputs the temporary chord route from the temporary chord route creation unit 20 and inputs the chord root shift value 102 and the lower keyboard chord type 103 from the table 15. Then, the determination means 16 adds and corrects the chord root shift value 102 to the temporary chord root, records the lower keyboard code root in the storage means 21, and records the lower keyboard code type 103 in the storage means 22.
[0025]
FIG. 3 shows an example of the contents of a part of the table 15. In the address pattern 111, for example, the constituent sound is Sidomi and the temporary chord root is B, which is the lowest sound. By adding “1” as the shift value 102 to the temporary chord root, the lower keyboard chord root becomes C. The code type 103 is M7. Further, when the key is pressed on the lower keyboard, Caug is detected, and when the key is pressed on the lower keyboard, G # aug is detected.
[0026]
In FIG. 2, the chord route storage means 21 stores the chord route of the modified lower keyboard. The chord type storage means 22 stores the lower keyboard chord type described above. The base offset value creating means 23 inputs a key-on / off event of the foot keyboard, subtracts (differs) the lower keyboard chord root in the chord root storage means 21 from the key number (base root) in the key-on event of the foot keyboard, Create a base offset value. This base offset value corresponds to the base offset value 202 in the table of FIG.
[0027]
As shown in FIG. 4, the table 24 inputs the lower keyboard chord type 201 in the chord type storage means 22 and the base offset value 202 created by the base offset value creating means 23 to turn on / off the base route 203, The code route shift value 204 and the code type 205 are output. FIG. 4 shows an example of part of the contents of the table 24.
[0028]
The determination unit 25 determines the true code route and the true code type according to the table 24 and also determines whether the base route is on / off (presence / absence). The true chord root is obtained by adding the chord root shift value 204 of FIG. 4 to the lower keyboard chord root in the chord root storage means 21. The true code type is the code type 205 in FIG. The base route on / off is the base route on / off 203 in FIG. When the base route is on (present), the key number (base route) of the foot keyboard is set to the true base route.
[0029]
The storage means 26 stores the true code route, the true code type, and on / off of the base route, and also stores the base route when the base route is on.
[0030]
As described above, the first chord detector (determination unit 16) uses the conversion table 15 to detect the first chord root and the first chord type according to the operation of the hand keyboard (lower keyboard). To do. The second chord detection unit (conversion table 24) has the second chord root, the second chord type, and the chord keyboard in response to the detected first chord root, the first chord type, and the keyboard operation. Detect presence of base route. Hereinafter, a specific example of FIG. 4 will be described.
[0031]
(1) The pattern 211 is when the first chord type 201 is major and the base offset value 202 is 0. For example, the chord “C” is detected on the lower keyboard, and “C” is detected on the foot keyboard. "Is depressed, the second chord root becomes" C ", and the second chord type 205 becomes major. The base route is turned off.
[0032]
(2) The pattern 212 is when the first chord type 201 is major and the base offset value 202 is 11. For example, the chord “C” is detected on the lower keyboard, and “B” is detected on the foot keyboard. "Is pressed, the second chord route becomes" C ", the second chord type 205 becomes major, and the base route becomes B.
[0033]
(3) The pattern 213 is when the first chord type 201 is aug and the base offset value 202 is 4. For example, the chord “Caug” is detected on the lower keyboard, and “E” is pressed on the foot keyboard. If it is locked, the second code route is “E”, the second code type 205 is aug, and the base route is turned off. In this case, the simple process results in “Caug / E”, but the code route is corrected because it is not appropriate. Furthermore, even when the lower keyboard chord route and the foot keyboard base route are different, the base route is turned off.
[0034]
(4) The pattern 214 is when the first chord type 201 is aug and the base offset value 202 is 8. For example, the chord “Caug” is detected on the lower keyboard, and “A ♭” is detected on the foot keyboard. When the key is depressed, the second chord route is “A ♭”, the second chord type 205 is aug, and the base route is turned off. In this case, the code route is corrected and the base route is turned off. Also, for example, when the chord “G # auug” is detected on the lower keyboard and “E” is pressed on the foot keyboard, the second chord root becomes “E”, and the second chord type 205 Becomes aug and the base route is turned off.
[0035]
(5) The pattern 215 is when the first chord type 201 is aug and the base offset value 202 is 9. For example, the chord “Caug” is detected on the lower keyboard and “A” is pressed on the foot keyboard. If it is locked, the second chord root becomes “A”, the second chord type 205 becomes mM7, and the base root is turned off. Also in this case, the code route and the code type are corrected, and the base route is turned off.
[0036]
(6) The pattern 216 is when the first chord type 201 is aug and the base offset value 202 is 11. For example, a chord “Caug” is detected on the lower keyboard, and “B” is depressed on the foot keyboard. If the key is locked, the second code route becomes “C”, the second code type 205 becomes aug, and the base route becomes B.
[0037]
(7) The pattern 217 is when the first chord type 201 is m # 5 and the base offset value 202 is 8. For example, the chord “Cm # 5” is detected on the lower keyboard, and “ When “A ♭” is pressed, the second chord route becomes “A ♭”, the second chord type 205 becomes Δ7, and the base route turns off. In this case, the code route and code type are corrected, and the base route is turned off.
[0038]
(8) The pattern 218 is when the first chord type 201 is m # 5 and the base offset value 202 is 11. For example, the chord “Cm # 5” is detected on the lower keyboard, and “ When “B” is pressed, the second chord route becomes “C”, the second chord type 205 becomes m # 5, and the base route becomes B.
[0039]
As described above, the table 24 determines the presence / absence of the base route regardless of whether or not the temporary hand keyboard chord route and the temporary foot keyboard base route are the same. Even when the keyboard base route is different, it may be determined that there is no base route. The table 24 may output a true code route and code type different from the temporary code route and code type according to the temporary code type and base offset value.
[0040]
Next, in FIG. 2, a method for detecting chords according to the operation of the lower keyboard and the foot keyboard when only one or two keys are pressed on the lower keyboard will be described. The fourth key-on bitmap creation means 18 is based on the second key-on bitmap created by the second key-on bitmap creation means 12 and the key-on / off event of the foot keyboard, and the chord detection ranges of the lower keyboard and the foot keyboard. Only the key number at is detected and a fourth key-on bitmap is created.
[0041]
The temporary chord route creating means 20 detects one key (for example, the lowest note) of the foot keyboard as a temporary chord route. On the other hand, the fifth key-on bitmap creating unit 19 creates a fifth key-on bitmap compressed within one octave based on the fourth key-on bitmap. At this time, since it is known that the lowest tone as the temporary chord root always has a bit of 1, the fifth key-on bitmap can be created with 11 bits by omitting the lowest tone bit.
[0042]
The address creating means 14 creates an address necessary for referring to the table based on the fifth key-on bitmap. The table 15 outputs the lower keyboard chord type 103 and the chord shift value 102 according to the above address. The determination unit 16 inputs the temporary chord route from the temporary chord route creation unit 20 and inputs the lower keyboard chord type 103 and the chord root shift value 102 from the table 15. Then, the determination means 16 adds the shift value 102 to the temporary chord root for correction, and causes the storage means 17 to store the lower keyboard chord root and the lower keyboard chord type. In this case, the base route is turned off.
[0043]
FIG. 5 illustrates a code route conversion performed after the determination unit 16 of FIG. 2 determines an augment or a diminished code type. The code type 301 is a true code type determined last time, and may be an arbitrary type. The code 302 is a temporary code determined by the determination unit 16 this time, and includes a code route 311, a code type 312, and a base route 313. The chord root 311 indicates a semitone unit value obtained by subtracting the previous true chord root from the current temporary chord root. The code 303 is a true code determined by this conversion, and includes a code route 321, a code type 322, and a base route 323. The chord root 321 indicates a semitone unit value to be added to the previous true chord root.
[0044]
First, the case of augment will be described. If the temporary chord type 312 detected this time is an augment, and the temporary chord route 311 detected this time is the same as the true chord root detected last time, or four semitones or eight semitones higher, the true chord of this time The route 321 is made the same as the previous true chord route, and the current true chord type 322 is augmented. If the sound of the foot keyboard differs from the previous true chord root, the base route 323 adopts the foot root sound and adopts the foot keyboard sound.
[0045]
Next, the case of diminished will be described. If the temporary chord type 312 detected this time is diminished and the temporary chord root 311 detected this time is one semitone, four semitones, seven semitones or ten semitones higher than the true chord root detected last time, The chord root 321 is made a chord root obtained by adding a semitone to the previous true chord root, and the current true chord type 322 is made diminished. If the sound of the foot keyboard is different from the sound of a semitone higher than the previous true chord root, the base route 323 is set to have a base route and adopts the sound of the foot keyboard. Hereinafter, a more detailed processing method will be described.
[0046]
FIGS. 6 to 8 temporarily store the detected code as a temporary code and detect the temporary code as a true code after a certain period of time in order to detect a key pressed almost simultaneously as a single code. To do. The detailed description will be given below.
[0047]
FIG. 6 is a flowchart showing the initialization process. In step S401, the code CCHD (including the presence / absence of the code route, code type, and base route) is initialized to 0xff. In step S402, the temporary code TCHD (including the presence / absence of the code route, code type, and base route) is initialized to 0xff. In step S403, the counter is initialized to zero. Thus, the process ends.
[0048]
FIG. 7 is a flowchart showing processing performed after code detection. In step S501, the code detected in FIGS. 9 and 10 described later is set in the temporary code TCHD. In step S502, for example, a value of 400 ms is set in the counter. Thus, the process ends.
[0049]
FIG. 8 is a flowchart showing the timer interrupt process, which is a process periodically performed at regular time intervals. In step S601, it is checked whether a counter is set in step S502. If it has been set, the process proceeds to step S602. If it has not been set, the process ends. In step S602, the counter value is decremented. In step S603, it is checked whether the counter value is zero. If it is 0, the process proceeds to step S604, and if it is not 0, the process is terminated. In step S604, temporary code TCHD is stored as true code CCHD. That is, for example, after 400 ms, the temporary code TCHD is stored as the true code CCHD. Thus, the process ends.
[0050]
FIGS. 9 and 10 are processes when the code type determined by the determining means 16 of FIG. 2 is augment or diminished, and is a flowchart showing the processes after the determination by the determining means 16. First, in step S701, the code root chk_root, the code type chk_type, and the base root chk_bs_root are initialized to 0xff.
[0051]
Next, in step S702, it is checked whether or not the code type d_type determined by the determination unit 16 is an augment. If it is an augment, the process proceeds to step S703, and if it is not an augment, the process proceeds to step S711. In step 703, it is checked whether or not the temporary code route d_root determined by the determining means 16 is the same as the true code route c_root detected last time. If they are the same, the process proceeds to step S706, and if they are not the same, the process proceeds to step S704. In step 704, it is checked whether or not the temporary chord route d_root determined by the determining means 16 is the same as a route that is four semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S706, and if not, the process proceeds to step S705. In step 705, it is checked whether or not the temporary chord route d_root determined by the determining means 16 is the same as a route that is eight semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S706, and if they are not the same, the process proceeds to step S711.
[0052]
In step S706, it is checked whether or not there is a pedal key-on event generated by pressing the foot keyboard. If there is a pedal key-on event, the process proceeds to step S708, and if not, the process proceeds to step S707. In step S707, the true code root c_root detected last time is set to the true code root o_root. Then, the augment is set to the true code type o_type. Then, the true base route o_bs_root is set to no base route. Thereafter, the process ends.
[0053]
In step S708, the key number (pitch) corresponding to the pedal key-on event is acquired, and the remainder obtained by dividing the key number by 12 is used as the key number. That is, the key number is stored as a pitch name having a value of 0 to 11 in one octave, and is set as the base route p_root. Next, in step S709, it is checked whether or not the base route p_root is the same as the true code route c_root detected last time. If they are the same, the process proceeds to step S711, and if they are not the same, the process proceeds to step S710. In step S710, the true code root c_root detected last time is set to the code root chk_root. Then, an augment is set in the code type chk_type. Then, the base route p_root pressed this time is set to the base route chk_bs_root. Thereafter, the process proceeds to step S721.
[0054]
In step S711, it is checked whether or not the code type d_type determined by the determining unit 16 is diminished. If diminished, the process proceeds to step S712, and if not diminished, the process proceeds to step S721. In step S712, it is checked whether or not the temporary chord route d_root determined by the determining unit 16 is the same as a route that is semitone higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S716, and if not, the process proceeds to step S713. In step S713, it is checked whether or not the temporary chord route d_root determined by the determining unit 16 is the same as a route that is four semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S716, and if not, the process proceeds to step S714. In step S714, it is checked whether or not the temporary chord route d_root determined by the determining unit 16 is the same as a route that is 7 semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S716, and if not, the process proceeds to step S715. In step S715, it is checked whether or not the temporary chord route d_root determined by the determining unit 16 is the same as a route that is 10 semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S716, and if not, the process proceeds to step S721.
[0055]
In step S716, it is checked whether or not there is a pedal key-on event generated by pressing the foot keyboard. If there is a pedal key-on event, the process proceeds to step S718, and if not, the process proceeds to step S717. In step S717, a route that is a semitone higher than the true chord route c_root detected last time is set as the true chord route o_root. Then, diminished is set to the true code type o_type. Then, the true base route o_bs_root is set to no base route. Thereafter, the process ends.
[0056]
In step S718, a key number (pitch) corresponding to the pedal key-on event is acquired, and a remainder obtained by dividing the key number by 12 is set as a key number. That is, the key number is stored as a pitch name having a value of 0 to 11 in one octave, and is set as the base route p_root. Next, in step S719, it is checked whether or not the base route p_root is the same as the route that is semitone higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S721, and if not, the process proceeds to step S720. In step S720, a route that is a semitone higher than the true chord route c_root detected last time is set as the chord route chk_root. Then, the code type chk_type is set to diminished. Then, the base route p_root pressed this time is set to the base route chk_bs_root. Thereafter, the process proceeds to step S721.
[0057]
In step S721, the determination unit 25 of FIG. 2 performs conversion using the conversion table 24, and determines the presence / absence of the code route t_root, the code type t_type, and the base route. As shown in FIG. 2, the determining unit 25 performs the conversion according to the code determined by the determining unit 16, and does not use the code root chk_root, the code type chk_type, and the base root chk_bs_root.
[0058]
In step S722, it is checked whether or not the code root chk_root is an initial value (0xff). If it is the initial value, the process proceeds to step S726, and if it is not the initial value, the process proceeds to step S723. In step S723, it is checked whether both code types t_type and chk_type are augments. If both are augments, the process proceeds to step S725; otherwise, the process proceeds to step S724. In step S724, it is checked whether both code types t_type and chk_type are diminished. If both are diminished, the process proceeds to step S725; otherwise, the process proceeds to step S726. In step S725, the code root chk_root is set to the true code root o_root. Then, the code type chk_type (augment or diminished) is set to the true code type o_type. Then, the base route chk_bs_root is set to the true base route o_bs_root. Thereafter, the process ends.
[0059]
In step S726, the code root t_root is set to the true code root o_root, and the code type t_type is set to the true code type o_type. Next, in step S727, it is checked whether or not it is determined that there is a base route by the conversion in step S721. If there is a base route, the process proceeds to step S729, and if there is no base route, the process proceeds to step S728. In step S728, the true base route o_bs_root is set to no base route. In step S729, the base route p_root by key depression is set to the true base route o_bs_root. Thus, the process ends.
[0060]
As described above, the true code root o_root, the true code type o_type, and the true base root o_bs_root are determined according to the conversion table of FIG. This code is set to the code CCHD after 400 ms, for example, according to the processing of FIGS. When the next code is detected, this code CCHD is processed as a true code detected last time. Specific examples will be described below.
[0061]
(1) A case where the previously detected code is C and this time the key is pressed on the lower keyboard will be described. So # Domi can be any of Caug, Eaug and G # aug. The determining means 16 in FIG. 2 determines G # aug because the lowest sound of the sound #Domi is G #. In step S702, it is determined that the code type d_type is an augment. In step S705, it is determined that the court route d_root (= G #) is the same as the route that is eight semitones higher than the previous chord route c_root (= C). In step S707, Caug is determined as the true code. Thereby, an appropriate chord progression of C → Caug is detected.
[0062]
(2) The case where the code detected last time is F and the key is pressed on the lower keyboard this time will be described. The dome file #ra can be any of Cdim, E ♭ dim, F # dim, and Adim. The determining means 16 in FIG. 2 determines Cdim from the lowest sound of the dome fan #ra. In step S711, it is determined that the code type d_type is diminished. In step S714, it is determined that the route is the same as the route that is seven semitones higher than the court route d_root (= C) and the previous chord route c_root (= F). In step S717, F # dim is determined as the true code. Thereby, an appropriate chord progression of F → F # dim is detected.
[0063]
(3) The case where the previously detected code is C, and the current key is pressed on the lower keyboard and the key is pressed on the foot keyboard will be described. So # Domi can be any of Caug, Eaug and G # aug. The determining means 16 in FIG. 2 determines G # aug because the lowest sound of the sound #Domi is G #. In step S702, it is determined that the code type d_type is an augment. In step S705, it is determined that the court route d_root (= G #) is the same as the route that is eight semitones higher than the previous chord route c_root (= C). In step S710, Caug / E is determined as the code. Next, in step S721, the determination unit 25 in FIG. 2 determines Eaug (pattern 214 in FIG. 4) based on G # aug / E. In step S723, it is determined that both code types are augments. In step S725, Caug / E is determined as the true code. Thereby, an appropriate chord progression of C → Caug / E is detected. In both the conversions in step S710 and step S721, when an augment is detected, it may be determined as an augment, so the conversion result in step S710 is preferentially adopted.
[0064]
(4) A case where the previously detected code is C, and this time the domino key is pressed with the lower keyboard and the key is pressed with the foot keyboard will be described. Domiso # can be any of Caug, Eaug, and G # aug. The determining means 16 in FIG. 2 determines Caug because the lowest tone of Domiso # is C. In step S702, it is determined that the code type d_type is an augment. In step S703, it is determined that the court route d_root (= C) and the previous code route c_root (= C) are the same. In step S710, Caug / A is determined as the code. Next, in step S721, the determination unit 25 in FIG. 2 determines AmM7 (pattern 215 in FIG. 4) based on Caug / A. In step S723, it is determined that both code types are not augments. In steps S726 to S728, AmM7 is determined as the true code. Thereby, suitable code detection of AmM7 is performed. If an augment is detected in step S710 and not an augment in step S721, it means that the augment is inappropriate, and the conversion result in step S721 is adopted.
[0065]
FIG. 11 illustrates chord conversion when the performer's performance is cliche. Cliche refers to an idiomatic line where the same chord is added decoratively to a continuous part, and is one of the techniques for composition / arrangement, and does not change the chord itself. A smooth line with semitones or full sounds is set in order to escape from boredom due to the continuation of the same chord.
[0066]
The code type 801 is a true code type determined last time. The code 802 is a temporary code determined by the determination unit 16 this time, and includes a code route 811, a code type 812, and a base route 813. A chord root 811 indicates a semitone value obtained by subtracting the previous true chord root from the current temporary chord root. The code 803 is a true code determined by this conversion, and includes a code route 821, a code type 822, and a base route 823. The chord root 821 indicates a semitone unit value to be added to the previous true chord root.
[0067]
First, the case of the cliché pattern 831 will be described. This is processing when the true code type determined last time is m # 5. The temporary chord type 812 detected this time is diminished, the temporary chord route 811 detected this time is 9 semitones higher than the true chord route detected last time, and the base route 813 detected this time is the true code detected last time. Is the same as the previous true code route, the current true code type 822 is set to m6, and the current base route 823 is set to have no base route. For example, an appropriate cliché of Dm # 5 → Dm6 can be detected, and inappropriate code detection of Dm # 5 → Ddim can be eliminated. However, in cases other than cliché, it is appropriate to detect Ddim. Dm6 and Ddim have the same constituent sound, but an appropriate chord can be selected by referring to the previous chord.
[0068]
Next, the case of the cliché pattern 832 will be described. This is processing when the last determined true code type is minor. The temporary chord type 812 detected this time is major, the temporary chord route 811 detected this time is eight semitones higher than the true chord route detected last time, and the base route 813 detected this time is the true chord detected last time. Is the same as the previous true code route, the current true code type 822 is set to m # 5, and the current base route 823 is set to have no base route. To do. For example, an appropriate cliché of Dm → Dm # 5 can be detected, and inappropriate code detection of Dm → B ♭ / D can be eliminated. However, in cases other than cliché, it is appropriate to detect B ♭ / D. Dm # 5 and B ♭ / D have the same constituent sound, but an appropriate chord can be selected by referring to the previous chord.
[0069]
Next, the case of the cliché pattern 833 will be described. This is processing when the last determined true code type is minor. The temporary code type 812 detected this time is a minor, the temporary code route 811 detected this time is the same as the true code route detected last time, and the base route 813 detected this time is the true code detected last time. When the current root route is the same or semitone higher, the current true chord route 821 is made the same as the previous true chord route, the current true chord type 822 is made minor, and the current base route 823 is the base route (this time To the base root of the sound of the foot keyboard. For example, an appropriate cliché of Am / G → Am / F # can be detected, and inappropriate code detection of Am / G → F # m7-5 can be eliminated. However, in cases other than cliché, it is appropriate to detect F # m7 ♭ 5. Am / F # and F # m7 ♭ 5 have the same constituent sound, but an appropriate chord can be selected by referring to the previous chord.
[0070]
Also in the case of cliché, the above-described processes of FIGS. 6 to 8 are performed. The cliché code detection processing procedure will be described below. 12 and 13 are flowcharts showing cliché code detection processing after the code is determined by the determination means 16 of FIG.
[0071]
First, in step S901, it is checked whether or not there is a pedal key on event generated by a key depression operation on the foot keyboard. If there is a pedal key-on event, the process proceeds to step S902, and if not, the process proceeds to step S918. In step S902, it is checked whether or not the temporary code type d_type determined by the determination unit 16 in FIG. 2 is major. If it is major, the process proceeds to step S903, and if it is not major, the process proceeds to step S907. In step S903, it is checked whether or not the temporary chord route d_root determined by the determining means 16 in FIG. 2 is the same as a route that is eight semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S904, and if they are different, the process proceeds to step S907. In step S904, it is checked whether or not the last detected true code type c_type is minor. If it is minor, the process proceeds to step S905, and if it is not minor, the process proceeds to step S907. In step S905, it is checked whether the base route d_bass, which is the key number in the pedal key-on event (step S901), is the same as the previous true chord route c_root. If they are the same, the process proceeds to step S906, and if they are different, the process proceeds to step S907. In step S906, the previous true code root c_root is set to the current true code root o_root. Then, m # 5 is set to the true code type o_type of this time. Then, no base route is set to the true base route o_bs_root of this time. This process is the process of the cliché pattern 832 in FIG. Thereafter, the process ends.
[0072]
In step S907, it is checked whether or not the temporary code type d_type determined by the determining unit 16 in FIG. 2 is diminished. If diminished, the process proceeds to step S908, and if not diminished, the process proceeds to step S912. In step S908, it is checked whether or not the temporary chord route d_root determined by the determining unit 16 in FIG. 2 is the same as a route 9 semitones higher than the true chord route c_root detected last time. If they are the same, the process proceeds to step S909, and if they are different, the process proceeds to step S912. In step S909, it is checked whether or not the true code type c_type detected last time is m # 5. If it is m # 5, the process proceeds to step S910, and if it is not m # 5, the process proceeds to step S912. In step S910, it is checked whether the base route d_bass, which is the key number in the pedal key-on event (step S901), is the same as the previous true chord route c_root. If they are the same, the process proceeds to step S911, and if they are different, the process proceeds to step S912. In step S911, the previous true code root c_root is set to the current true code root o_root. Then, m6 is set to the current true code type o_type. Then, no base route is set to the true base route o_bs_root of this time. This process is a process of the cliché pattern 831 in FIG. Thereafter, the process ends.
[0073]
In step S912, it is checked whether or not the temporary code type d_type determined by the determining unit 16 in FIG. 2 is minor. If it is minor, the process proceeds to step S913. If it is not minor, the process proceeds to step S918. In step S913, it is checked whether or not the temporary code route d_root determined by the determination unit 16 in FIG. 2 is the same as the true code route c_root detected last time. If they are the same, the process proceeds to step S914, and if they are different, the process proceeds to step S918. In step S914, it is checked whether or not the last detected true code type c_type is minor. If it is minor, the process proceeds to step S915. If it is not minor, the process proceeds to step S918. In step S915, it is checked whether the base route d_bass, which is the key number in the pedal key-on event (step S901), is the same as the previous true base route c_bass. If they are the same, the process proceeds to step S917, and if they are different, the process proceeds to step S916. In step S916, it is checked whether or not the base route d_bass, which is the key number in the pedal key-on event (step S901), is the same as a route that is a semitone higher than the previous true base route c_bass. If they are the same, the process proceeds to step S917, and if they are different, the process proceeds to step S918. In step S917, the previous true code root c_root is set to the current true code root o_root. Then, a minor is set to the true code type o_type of this time. Then, the base route d_bass for the current key depression is set to the current true base route o_bs_root. This process is the process of the cliché pattern 833 in FIG. Thereafter, the process ends.
[0074]
The processes in steps S918 to S922 are general code detection processes other than cliches, augments, and diminisheds, and are the same as the processes in FIG. In step S918, the determination unit 25 of FIG. 2 performs conversion using the conversion table 24, and determines the presence / absence of the code route t_root, the code type t_type, and the base route. In step S919, the code root t_root is set to the true code root o_root, and the code type t_type is set to the true code type o_type. Next, in step S920, it is checked whether or not it is determined that there is a base route by the conversion in step S918. If there is a base route, the process proceeds to step S922, and if there is no base route, the process proceeds to step S921. In step S921, no base route is set for the true base route o_bs_root. In step S922, the key route base route d_bass is set to the true base route o_bs_root. Thus, the process ends.
[0075]
As described above, the true code root o_root, the true code type o_type, and the true base root o_bs_root are determined according to the conversion table of FIG. This code is set to the code CCHD after 400 ms, for example, according to the processing of FIGS. When the next code is detected, this code CCHD is processed as a true code detected last time.
[0076]
According to this embodiment, by detecting a code according to the code detected last time, an appropriate cliché code can be detected. The code detection process described above may be configured by hardware or software. An example using the code detection program software will be described below.
[0077]
FIG. 14 is a block diagram illustrating a hardware configuration example of the electronic musical instrument according to the present embodiment. A sound source (TG) 32, CPU 33, panel switch 34, keyboard 35, ROM 36, RAM 37, and D / A converter 38 are connected to the bus 31. The CPU 33 can obtain time information from the timer 30 and perform timer interrupt processing (FIG. 8).
[0078]
The CPU 33 performs various calculations or processes, and executes the above-described code detection process in accordance with the computer program stored in the ROM 36 or the RAM 37. The RAM 37 is used as a working area for the CPU 33. The panel switch 34 has controls such as a style number switch 3 (FIG. 1) for determining an automatic accompaniment style number.
[0079]
The keyboard 35 includes a hand keyboard and a foot keyboard 35c including an upper keyboard 35a and a lower keyboard 35b, and includes a plurality of keys that can be pressed and released. When the keyboard 35 is depressed, a key-on event including velocity (key-pressing speed) and key number (pitch) is transmitted to the CPU 33, and when the keyboard 35 is released, a key-off event is transmitted to the CPU 33.
[0080]
The sound source 32 generates a musical tone signal in accordance with the operation of the keyboard 35 or the automatic accompaniment data in the ROM 36. The D / A converter 38 converts the digital musical tone signal generated by the sound source 32 into an analog format and outputs it to the amplifier 39. The amplifier 39 amplifies the musical sound signal, and the musical sound is generated by the speaker 40.
[0081]
According to the present embodiment, the first chord detector (determination means 16) detects the first chord root and the first chord type in accordance with the operation of the hand keyboard. The second chord detection unit (FIG. 5 or FIG. 11) determines the second chord root according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. The second code type and the presence / absence of the base route are detected.
[0082]
Since the current chord is detected according to the chord detected last time as well as the operation of the keyboard, the chord intended by the performer according to the performance flow can be detected. Specifically, the chord root intended by the performer can be selected in the augment and diminished, and the chord intended by the performer can be selected in the cliché.
[0083]
This embodiment can be realized by a computer executing a program. Also, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium such as the Internet for transmitting such a program is also applied as an embodiment of the present invention. Can do. A program product such as a computer-readable recording medium in which the above program is recorded can also be applied as an embodiment of the present invention. The above program, recording medium, transmission medium, and program product are included in the scope of the present invention. As the recording medium, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
[0084]
Each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.
[0085]
【The invention's effect】
As described above, since the current chord is detected not only according to the operation of the performance keyboard but also according to the chord detected last time, the chord intended by the performer according to the performance flow can be detected.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration example of an electronic musical instrument according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of code determination processing means.
FIG. 3 is a diagram showing an example of the contents of a part of a first conversion table.
FIG. 4 is a diagram showing an example of the contents of a part of a second conversion table.
FIG. 5 is a diagram showing an augmentation and diminished chord root conversion;
FIG. 6 is a flowchart showing an initialization process.
FIG. 7 is a flowchart showing processing performed after code detection.
FIG. 8 is a flowchart showing timer interrupt processing.
FIG. 9 is a flowchart showing an augment and diminished code detection process;
FIG. 10 is a flowchart showing an augment and diminished code detection process;
FIG. 11 is a diagram showing cliché code conversion;
FIG. 12 is a flowchart showing cliché code detection processing;
FIG. 13 is a flowchart showing cliché code detection processing;
FIG. 14 is a diagram illustrating a hardware configuration example of an electronic musical instrument.
[Explanation of symbols]
1 Lower keyboard
2 foot keyboard
3 Style number switch
4 Code decision processing means
5 Automatic accompaniment pronunciation processing means
30 timer
31 bus
32 sound sources
33 CPU
34 Panel switch
35 keyboard
35a Upper keyboard
35b Lower keyboard
35c foot keyboard
36 ROM
37 RAM
38 D / A converter
39 amplifier
40 Speaker

Claims (20)

A performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation;
A first chord detector for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The presence or absence of the second chord root, the second chord type and the base root is detected according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detector that
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard And
When both the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. An apparatus for detecting a chord of an electronic musical instrument, comprising: a determination unit adopting a third chord type ; When the first chord type detected this time is an augment, the second chord detector detects the first chord root, the first chord type, the operation of the foot keyboard, and the previous detection. has been in accordance with the code, the code detecting device for an electronic musical instrument 請 Motomeko 1 wherein that determine a different code from the code was last detected. When the first chord type detected this time is an augment, the second chord detector detects the first chord root, the first chord type, the operation of the foot keyboard, and the previous detection. has been in accordance with the code, the code detecting device for an electronic musical instrument 請 Motomeko 2 wherein that determine the different second chord root and code previously detected.   In the second chord detection unit, the first chord type detected this time is an augment, and the first chord route detected this time is the same as the second chord route detected last time, four semitones or 4. The chord detection apparatus for an electronic musical instrument according to claim 3, wherein when the pitch is eight semitones higher, the current second chord root is made the same as the previous second chord root and the current second chord type is an augment. A performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation;
A first chord detector for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The presence or absence of the second chord root, the second chord type and the base root is detected according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detector that
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard And
When both the second code type and the third code type are diminished, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. A decision unit adopting the code type 3
A code detection device for an electronic musical instrument. When the first chord type detected this time is diminished, the second chord detector detects the first chord root, the first chord type, the operation of the foot keyboard, and the previous chord detected. depending on the code, the code detecting device for an electronic musical instrument 請 Motomeko 5 wherein that determine a different code from the code was last detected. When the first chord type detected this time is diminished, the second chord detector detects the first chord root, the first chord type, the operation of the foot keyboard, and the previous chord detected. depending on the code, the code detecting device for an electronic musical instrument 請 Motomeko 6 wherein that determine the different second chord root and code previously detected.   In the second chord detection unit, the first chord type detected this time is diminished, and the first chord root detected this time is one semitone, four semitones, 7 semitones from the second chord root detected last time. 8. The chord of the electronic musical instrument according to claim 7, wherein when the number of semitones or ten semitones is higher, the current second chord root is made a chord root obtained by adding a semitone to the previous second chord root, and the current second chord type is diminished. Detection device. The second code detection unit determines that the relationship between the second code route and the second code type detected last time and the first code route and the first code type detected this time is cliché. is the case was in accordance with the second chord root and second code type which is previously detected, this second chord root and / or electronic musical instrument according to claim 5, wherein determining the second code type Code detection device. The second code detection unit includes the presence / absence of the second code route, the second code type, and the base route detected last time, and the first code route, the first code type, and the base route detected this time. If it is determined that the relationship with the presence / absence is cliché, the second code route, second 6. A chord detection apparatus for an electronic musical instrument according to claim 5 , wherein the chord type and / or presence / absence of a base route is determined. In the second code detection unit, the second code type detected last time is m # 5, the first code type detected this time is diminished, and the first code route detected this time is When the detected base chord is 9 semitones higher than the detected second chord route and the same as the previously detected second chord route, it depends on the previously detected second chord route and the second coat type. The chord detection apparatus for an electronic musical instrument according to claim 5 , wherein the second chord type for this time is determined. In the second code detection unit, the second code type detected last time is m # 5, the first code type detected this time is diminished, and the first code route detected this time is When the detected base chord is 9 semitones higher than the detected second chord root and the same as the previously detected second chord root, the current second chord root is the same as the previous second chord root. 6. The chord detection apparatus for an electronic musical instrument according to claim 5 , wherein the current second chord type is set to m6 and the base route is omitted. In the second code detection unit, the second code type detected last time is minor, the first code type detected this time is major, and the first code route detected this time is detected. When the base route detected this time is the same as the second chord route detected last time, according to the second chord type and the second code type detected last time, 6. The chord detection apparatus for an electronic musical instrument according to claim 5, wherein the second chord root and the second chord type are determined. In the second code detection unit, the second code type detected last time is minor, the first code type detected this time is major, and the first code route detected this time is detected. When the base route detected this time is eight semitones higher than the second chord route and the second chord route detected last time, the second chord route is made the same as the previous second chord route, 6. The chord detection apparatus for an electronic musical instrument according to claim 5 , wherein the second chord type this time is set to m # 5 and the base route is omitted. In the second code detection unit, the second code type detected last time is minor, the first code type detected this time is minor, and the first code route detected this time is detected. When the base route detected this time is the same or semitone higher than the previously detected base route, the second chord route, the second coat type and the base route detected last time 6. The electronic musical instrument chord detection apparatus according to claim 5, wherein the presence / absence of the second chord root, the second chord type, and the base root is determined accordingly. In the second code detection unit, the second code type detected last time is minor, the first code type detected this time is minor, and the first code route detected this time is detected. When the base route detected this time is the same or semitone higher than the previously detected base route, the current second chord route is made the same as the previous second chord route, 6. The chord detection apparatus for an electronic musical instrument according to claim 5 , wherein the second chord type is made minor and a base route is provided. A method of detecting a chord of an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation,
A first chord detection step for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The presence or absence of the second chord root, the second chord type and the base root is detected according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detection step to :
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard Steps,
When both the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. A method for detecting a chord of an electronic musical instrument, comprising: a determination step adopting a third chord type . A method of detecting a chord of an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation,
A first chord detection step for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The presence or absence of the second chord root, the second chord type and the base root is detected according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detection step to:
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard Steps,
When both the second code type and the third code type are diminished, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. A decision step to adopt the code type 3;
A method for detecting a chord of an electronic musical instrument. A code detection program for an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation,
A first chord detection step for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The presence or absence of the second chord root, the second chord type and the base root is detected according to the detected first chord root, the first chord type, the operation of the foot keyboard, and the chord detected last time. A second code detection step to :
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard Steps,
When both the second code type and the third code type are augments, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. A program for causing a computer to execute the determination step adopting the third code type . A code detection program for an electronic musical instrument having a performance keyboard for performance operation having a hand keyboard for manual operation and a foot keyboard for foot operation,
A first chord detection step for detecting a first chord root and a first chord type in response to an operation of the hand keyboard;
The detected first chord root, the first chord type, the operation of the foot keyboard, and the front A second code detection step for detecting the presence or absence of a second code route, a second code type and a base route according to the code detected once;
Third chord detection for detecting presence / absence of a third chord root, a third chord type, and a base route according to the detected first chord root, first chord type, and operation of the foot keyboard Steps,
When both the second code type and the third code type are diminished, the second code route and the second code type are adopted, and otherwise, the third code route and the third code type are adopted. A decision step to adopt the code type 3;
A program that causes a computer to execute.

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