JPH0962265A - Chord detection method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide chord progression simply and accurately. SOLUTION: A user inputs a melody data and in some measures chords (G7 , C) as shown in (a). Prospective chords are detected and displayed on the measures to which chords are not input by a chord detection operation as shown in (b). A chord progression table is searched in the order of priority based on the prospective chords and the input chords so as to decide the applicable chord progression. On the not decided measures, the chords having high priority among the prospective chords are decided and displayed as shown in (c).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chord detecting method and apparatus for automatically detecting chords of input performance data.

[0002]

2. Description of the Related Art When an automatic performance is performed, not only a melody alone but also an accompaniment for supporting a main melody from various sides is generally performed. There are chord parts, bass parts, and percussion instrument parts in this accompaniment.For chord parts and bass parts, chords are specified for each predetermined unit section such as a measure, and the specified chord sound is played according to the progress of the melody. It

Therefore, when performing an automatic performance based on the melody input by the user, it is necessary to specify a chord for each section of a predetermined unit such as a measure of the melody. For this reason, a method for automatically detecting a chord from sequential performance data (melody) has been proposed. In this method, all the chords are automatically detected by the chord detection device, and then this chord can be played so that the user can check the chords, and if the chords are not satisfied, the chords can be corrected to other chords. ing.

[0004]

However, in the conventional code detecting method, there is a problem that the technique for detecting the code is still incomplete and not all the codes are detected correctly. Further, even with the same performance data (melody), there may be a plurality of chords that can be added, and a chord that the user cannot satisfy or an incorrect chord may be designated. In such a case,
Although the correction can be performed as described above, the correction data (code) is not reflected in the code in the uncorrected section, so that the chord progression may be erratic.

Therefore, an object of the present invention is to provide a chord detection method and apparatus capable of easily and accurately designating a chord progression that suits a user's preference.

[0006]

In order to achieve the above object, the chord detecting method of the present invention comprises a first step of inputting performance data including pitch information, and a step of inputting the performance data. From the second step of inputting chords corresponding to some sections of the performance data, the performance data input in the first step, and the chords input in the second step, each section of the performance data The third step is to detect the code corresponding to.

Further, the chord detection device of the present invention comprises performance data input means for inputting performance data including pitch information,
Chord input means for inputting a code corresponding to a part of the performance data input by the performance data input means,
The performance data and chord detection means for detecting a chord corresponding to each section of the performance data from the inputted chord are provided.

According to the present invention as described above, since the user automatically inputs a chord in a portion of the performance data and automatically detects the chord, only a portion of the performance data is selected by the user. A code can be added. Moreover, since the data is used to automatically detect chords in other sections, it is possible to easily and accurately attach chord progressions that suit the user's preference.

[0009]

FIG. 1 is a block diagram showing the configuration of an example of an embodiment of a code detecting apparatus of the present invention for executing the code detecting method of the present invention. In this figure, the CPU
Reference numeral 1 is a central processing unit (CPU) that executes an operation program to perform various controls, and ROM 2 is a program memory including a read-only memory (ROM) in which the operation program of the CPU 1 is stored.
Is a working memory composed of a random access memory (RAM) which the CPU 1 uses as a work memory when executing a program.

The data input device 4 is a data input device including a keyboard and various switches for inputting chords in a part of the melody or performance data, and the display device 5 is a melody input by the data input device 4. A display device that displays the performance data of the musical notation by the notes displayed on the staff and also displays the chords input in a predetermined unit section of a part of the performance data, for example, a part of a bar defined as a unit section. The melody & chord data memory 6 is a memory composed of a RAM in which the melody and chord data input from the data input device 4 is written, and the chord & chord progression memory 7 is written with various chord data and chord progression data. The ROM is a memory.

HDD (Hard Disk Drive) 1
Reference numeral 0 is a storage device for storing various data such as an operation program, automatic performance data, and chord progression data. When the operation program is not stored in the ROM 2, the operation program is stored in the hard disk of the HDD 10. The stored operation program is
Read it into AM3. The CPU 1 reads the operation program from the RAM 3 and executes the operation program to
The CPU 1 can be caused to execute the same operation as when the operation program is stored in M2. In addition, HDD
Since 10 can freely perform writing / reading, it is possible to easily add an operation program and upgrade the version. The CD-ROM drive 11 is
This is a device for reading out an operation program and various data stored in a CD-ROM. The operation program and various data read from the CD-ROM 11 are written and stored in the hard disk in the HDD 10. Therefore,
It is possible to easily perform a new installation or version upgrade of the operation program.

In addition to the HDD 10 and the CD-ROM drive 11, a device using various types of media such as a floppy disk drive (FDD) or a magneto-optical disk (MO) device should be provided as an external storage device. You may The communication interface 12 is a LAN
It is connected to a communication network 21 such as (Local Area Network), the Internet, or a telephone line, and is connected to the server computer 31 via this communication network 21. Here, when the operation program and various data are not stored in the HDD 10, the operation program and various data are downloaded from the server computer 31 to the HDD 10 using the communication interface 12.

Specifically, the code detection apparatus of the present invention, which serves as a client, transmits a command requesting a download of an operation program and various data to the server computer 31 via the communication interface 12 and the communication network 21. Upon receiving this command, the server computer 31 delivers the requested operation program and various data to the code detecting device via the communication network 21, and the code detecting device causes the communication interface 12
The download is completed by receiving these operation programs and various data via the HDD and storing them in the HDD 10.

Next, a code detecting method which is an operation of the code detecting apparatus of the present invention will be described with reference to a screen displayed on the display device 5. FIG. 2A shows a display screen when the melody data is input from the data input device 4, and as shown in the figure, the notes indicating the melody are displayed on the staff notation. Further, the chord G ₇ and the chord C input by the user are displayed in the 1st bar 4th bar and the 2nd bar 3rd bar, respectively, and the chord is displayed in the bar in which the user has not input a code. In a place? Is displayed.

Next, the chord progression is automatically detected. First, the key is detected from the input melody. In this case, the key is detected as C major from the input melody.
Then, the chord sound in each measure, which is a unit section, is extracted, and the chord candidates of each measure having the extracted harmony sound as a constituent sound are listed. This screen is shown in FIG. For example, the chords D _m , D _m7 , _...
··· is displayed as a chord candidate, chord G ₇ is displayed as a chord candidate in the first bar, second bar, and chords C, C ₇ ... Are displayed as chord candidates in the first bar, third bar, Codes F, F ₇ , ... Are displayed as chord candidates in the second bar and the first bar, and chord F is displayed in the second bar and the second bar.
_m , A ♭, ... Are displayed as code candidates.
Also, the note of the extracted harmony is displayed with an * attached.

Further, a harmony sound is also extracted in the bar input by the user. However, if all of the harmony sounds extracted in the bar do not match the constituent sounds of the chord input by the user, FIG. The entered code blinks as shown in). That is, the code G ₇ input corresponding to the first bar and the fourth measure is blinked. This flashing
Indicates that the code should be modified,
In this case, for example, it is determined that the code G ₇ input by the user is wrong and the correct code C ₇ is input again. In this case, a new chord C ₇ is displayed in the 1st stage and 4th measure as shown in FIG. 2 (b).

Then, among the chords listed in each measure as chord candidates, the chord progression table of the corresponding key is searched in descending order of priority, and if there is a chord candidate that matches the chord progression, that chord is selected. It is decided as the chord of the bar. FIG. 3 shows a chord progression table in D major searched in this case. In this figure, the vertical axis indicates the priority of chord progression, the lower the priority, the lower the priority, and the horizontal axis indicates the order of progressive chords. For example, the chord progression of the first line, which has the highest priority in chord progression in major key, is II _m7 → V
₇ → It is considered to be the chord progression of I. II in this case,
V and I represent the tones of the chord, and II _m7 represents II.
Minor Seventh Code of Degree, V ₇ is Dominant
Seventh code, I is I degree code and tonic
It is called a chord (main chord).

Here, the first in the inputted melody
When the chord progressions of the 1st bar, 1st bar, 2nd bar, and 1st bar, 3rd bar are searched from the chord progression table shown in FIG. 3, chord D _m7 corresponds to chord II _m7 , and chord G ₇ is chord. Since it corresponds to V ₇ and the code C corresponds to the code I, it corresponds to the chord progression of the first line having the highest priority in the chord progression table. Therefore, the chord of the first bar and the first bar is fixed to the chord D _m7 , the chord of the first bar and the second bar is fixed to the chord G _7, and the chord of the first bar and the third bar is fixed to chord C.

Further, when the chord progressions of the 2nd stage 1st measure, the 2nd stage 2nd measure and the 2nd stage 3rd measure are searched from the chord progression table shown in FIG. 3, chord F corresponds to chord IV, Since the code F _m corresponds to the code IV _m and the code C corresponds to the code I, it corresponds to the chord progression (IV → IV _m → I) in the second line of the chord progression table. Therefore, the chord of the second bar, the first measure is fixed as chord F,
The chord of the second bar, the second bar is fixed to the chord F _m ,
The chord of the third bar of the stage is fixed to chord C.

When the bar code is thus confirmed, the chords of all the bars have been decided because the chords of the first and fourth bars in the example shown in the figure are the chords inputted by the user and have been decided. The display screen in which the chords are fixed for each measure in this manner is shown in FIG. If no chord candidate is applicable to the chord progression table shown in FIG. 3, the chord table shown in FIG. 4 is referred to. The chord table shown in this figure is a table in which chords in D major are vertically arranged in descending order of priority.

Further, FIG. 5 shows an example of how to divide the bar when the chord progression table shown in FIG. 3 is searched to detect the chord progression of each bar to detect the chord progression. To detect the corresponding chord progression, first, the first three measures are cut out as shown by and the chord progression table shown in FIG. 3 is searched to find the chords of the first to third measures from the listed chord candidates. To detect. Then, as shown by, the last bar of the previous three bars is divided into three bars so as to be overlapped, and the chord progression table is searched to detect the chords of the fourth bar and the fifth bar in the same manner. . continue,
The chords of the 6th and 7th bars are detected by dividing the last 3 bars of the previous 3 bars into 3 bars so as to be overlapped, and searching the chord progression table similarly. After that, the chord of each measure is detected in the same manner.

In this case, the case of 3 bars is shown, but when there is no chord progression that applies to the case of being separated by 3 bars, the code of each bar is detected again by being separated by 2 bars. When dividing into two measures, it shall be divided so that the last two measures overlap. If there is no applicable chord progression even after referring to the chord progression table shown in FIG. 3 divided by two bars, the section is reserved and the next step is performed. When the chord progression detection reaches the end of the song, the reserved section refers to the chord table shown in FIG. 4 so that the chord of only one measure is fixed.

When a chord is detected in the melody shown in FIG. 2 described above, the procedure is as follows. (1) First, the chord progression corresponding to these three measures is divided by dividing it into three measures from the first bar to the first measure to the third measure, and the chord progression table shown in FIG. 3 is searched. In this case, the chord progression of the first line corresponds and the chord is fixed. (2) Next, the first measure, the third measure, the fourth measure, and the second measure
The chord progression corresponding to the 3rd measure is searched by referring to the chord progression table in the same manner. In this case, the 1st stage, 4th measure, C is input by the user.
Since it is fixed at ₇ , along with the 1st stage 3rd measure,
C → C ₇ →? The chord progression is searched. (3) As a result of the search, since such a chord progression is not stored in the chord progression table of FIG.
Re-separate into two measures, measure 4 and measure 4, and search again by referring to the chord progression table. In this case, C →
Since the chord progression of C ₇ is confirmed, the chord progression of the next bar is detected.

(4) Next, the 1st stage, 4th measure, the 2nd stage, 1st stage
Separated by measures and 3 measures of the 2nd measure, C ₇ →? →?
Search for the chord progression. (5) As a result of the search, since such a chord progression is not stored in the chord progression table of FIG.
Re-separate into two measures, measure 1 and measure 2 in the second row, and then C ₇ →?
The chord progression is searched again by referring to the chord progression table. (6) Also in this search, C ₇ →? Since no chord progression corresponding to the chord progression is found, the section of the second bar and the first measure is suspended and the program advances to the next section. (7) Next, the bar is divided into three bars up to the second bar, the first bar, the second bar, and the third bar, and the chord progressions applicable to these three bars are searched with reference to the chord progression table shown in FIG. Since the second bar and the third bar are fixed to C by the user input, F →? → The chord progression C is searched by referring to the chord progression table shown in FIG. In this case, the chord progression of the second line of the chord progression table corresponds to the chord of three bars, and the chord progression including the reserved section of F → _Fm → C is determined.

Next, the control of the chord progression detection operation described above is performed by the CPU 1 executing the operation program, and a flowchart of the chord progression detection processing is shown in FIG. This chord progression detection process is started when the user gives an instruction for the chord progression detection process, and in step S10 of the flowchart shown in FIG. 6, a style instruction indicating any one of jazz, rock, dance, waltz, etc. from the data input device 4. Is input by the user, the input style designating data and melody data are stored in the melody & chord data memory 6, and the melody data is displayed on the display device 5 by the notes displayed on the staff. Is displayed.

Next, in step S20, some bars are selected.
The corresponding code is entered by the user from the data input device 4.
And this code will be displayed in the corresponding bar
It is stored in the melody & chord data memory 6. This place
The screen displayed on the display device 5 is shown in FIG.
You. Then, the melody stored in step S30
Key is detected from the data, and further to step S40.
The chords that are chord constituents are extracted, and the extracted chords
Make sure to add the * symbol to the note corresponding to the sound. This place
The screen displayed on the display device 5 is shown in FIG.
You. However, the code candidate is not displayed yet. Next
Then, in step S50, the user inputs a chord (chord).
The chords that are extracted in the
It is determined whether or not the sound matches. As shown in FIG.
In the case of the 1st stage 4th measure
If "NO" is determined and the corresponding code is obtained in step S60
First name, code G in this case₇ Flashes and the user is
It is in a state that requires re-input of the code. Where the user
Code C ₇ If you re-enter, in step S70, the user
Re-entered code C₇ Is the code G₇ Display instead of
It will be remembered.

If all the harmony sounds detected as in the second bar and third measure shown in FIG. 2B match the constituent sounds of the input chord, "YE" is entered in step S50.
2B, the chord including all the extracted chords is displayed as a chord candidate for each bar for which the user has not input a chord, as shown in FIG. 2B. Next, the progress code consisting of the chord determined in step S90 (in this case, the chord input by the user) or the candidate chord is added to the chord progression of the chord progression table shown in FIG. The corresponding one is searched in the order of higher priority in the key of the measure, and if there is a corresponding chord progression, the chord of the measure is determined as the chord forming the chord progression.

The bar division in this case is as shown in FIG. Up to this step S90, the chord of the bar is decided by the chord input by the user corresponding to the bar and the progress code corresponding to the chord progression table shown in FIG. 3, but some bars are not yet decided. . Therefore, with respect to the measure that has not been determined in step S100, the chord of that measure is determined as the chord having the highest priority in the detected key. In this case,
The code table shown in is searched. As described above, the chord of each bar is fixed, and the chord detected in each bar is displayed in step S110 as shown in FIG. 2 (c). Then, when the automatic performance switch is operated, the automatic performance device 8 automatically accompanies the style selected in step S120 and the detected chord, and the melody is automatically played.

Further, in the chord detecting method and apparatus of the present invention, the user can correct the chord progression of a part of the section after the chord progression is fixed. Then, next, this code correction process is performed as shown in FIG.
This will be described with reference to the flowchart shown in (b).
In the flowchart of the chord correction process shown in FIG. 7A, when the chord correction process is started by the user's instruction, the user specifies the section in which the chord progression is corrected in step S200. The correction section is designated as a section that the user does not like in the automatic chord determination, but may be the entire song.
Next, in step S210, the chord candidates of each bar in the correction section designated by the user are displayed again. This display is performed as shown in FIG.

At step S220, the user designates a desired code from among the re-displayed code candidates by referring to them. In this case, if there is no code to be specified in the code candidates, the user newly inputs the code.
Then, in step S230, a chord re-detection process, which is shown in detail in FIG. 9B, is executed to confirm the chord progression of the designated section. Then, in step S240, as shown in FIG.
As shown in (c), the confirmed detection code of each bar is displayed. When the automatic performance switch is operated, the automatic performance device 8 automatically accompanies the style selected in step S250 and the detected chord, and the melody is automatically played.

In the chord correction process for correcting the chord progression in a partial section after the chord progression is fixed in this way, the user specifies a desired chord from chord candidates, so that the user has knowledge of the chord. You will be able to specify the code without. Furthermore, if you specify a chord, not only the chord of the specified measure,
Since the chords up to the bars around it change according to the designated chord, the atmosphere of the accompaniment can be largely and appropriately changed.

Next, FIG. 7B in the code correction process
The flowchart of the code re-detection process shown in FIG. When the code re-detection process is started, step S
At 300, it is determined whether or not the correction section is three measures or more. If the correction section is 3 bars or more, YES is determined, and the process advances to step S310 to divide the section for re-detecting the chord into 3 bars. Next, in step S320, the chord progression table shown in FIG. 3 is searched, and in step S3
At 30 it is determined whether there is a matching chord progression. Here, if there is a matching chord progression, YES is determined in step S330, and the chord progression of the section of three bars divided in step S340 is determined.
If there is no matching chord progression, step S3
If NO is determined in 30, the process proceeds to step S380.

Then, in step S380, the section divided into three bars is redone into two bars, and in step S39.
At 0, the chord progression table shown in FIG. 3 is searched. The result of this search is determined in step S400. If there is a matching chord progression, it is determined to be YES and the chord progression of the section of two bars divided in step S340 is determined. Also, if there is no matching chord progression,
If NO is determined, the process proceeds to step S410, and detection of chord progression in the section is suspended. Step S30
If the correction section is less than 3 measures at 0, it is determined as NO and the process proceeds to step S370, where it is divided into 2 measures. The chord progression in the section divided into two bars is detected by the processing in step S390 and later.

When the process of step S340 or the process of step S410 is completed, the process proceeds to step S350, where it is determined whether or not the code re-detection process of the modified section is completed over all the sections. If there is a section in which the code re-detection processing is not performed, it is determined as NO, the processing of advancing to the next section is performed in step S420, and the process returns to step S300. And step S3
00 to step S340 or step S370
The code re-detection process of step S410 is performed in the next section. The processing that is cyclically performed in this manner is executed until it is determined in step S350 that the code re-detection processing for the corrected section has been performed over all the sections.

Here, when the code re-detection processing of the corrected section is executed over all the sections, step S35.
It is determined to be YES at 0 and the process proceeds to step S360. If there is an undetermined measure of chord progression, this step S
At 360, the chord table shown in FIG. 4 is referred to, and the chord of the undetermined measure is decided. As a result, the code re-detection processing ends, and the processing returns to the code correction processing.

Although the chord section is set to one bar unit,
The chord section is not limited to one bar and may be a unit of one bar or another bar. Further, the length of the chord section may be changed depending on the style, or the user may input the length of the chord section. Furthermore, the chord entered by the user is compared with the performance data of the chord section, and the chord is displayed in blinking when it is not suitable. Instead of this, the user is warned by voice or character display. You may do it. Note that the chord detection method of the present invention can be realized by a CPU or the like that executes a chord detection program, but instead of this, the chord progression detection operation described above can also be realized by hardware.

Further, the contents of the chord progression table are chord progressions of 3 bars and 2 bars, but chord progressions of 4 bars or more may be stored. Furthermore, the content of the chord progression table is not limited to the above example. Furthermore, although the user is first made to specify the chord of the desired measure, the chord candidates may be detected in advance and the chord candidate may be selected and designated.
Then, if there is no code desired by the user among the code candidates, a new code may be input.
Furthermore, as a method of confirming the chord, the chord is decided from the beginning of the song or the beginning of the specified section in the case of modifying the chord, but the chord is decided from the section including the chord specified by the user. The decision work may be carried out forward or backward from the section.

[0038]

Since the present invention is configured as described above, since the chord is automatically detected after the user inputs a chord in a part of the performance data, a part of the performance data is not detected. A user's favorite code can be added only to the section. Moreover, since the data is used to automatically detect chords in other sections, it is possible to easily and accurately attach chord progressions that suit the user's preference.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an example of an embodiment of a code detection device that executes a code detection method of the present invention.

FIG. 2 is a diagram showing a screen displayed on the display device of the code detection device for explaining the code detection method of the present invention.

FIG. 3 is a diagram showing an example of a chord progression table used in the chord detection method of the present invention.

FIG. 4 is a diagram showing an example of a code table used in the code detection method of the present invention.

FIG. 5 is a diagram for explaining how to divide bars in the chord detection method of the present invention.

FIG. 6 is a diagram showing a flowchart of chord progression detection processing executed during processing of the chord detection method of the present invention.

FIG. 7 is a diagram showing a flowchart of a code correction process executed during the process of the code detection method of the present invention and a code re-detection process during the code correction process.

[Explanation of symbols]

1 CPU, 2 program memory, 3 working memory, 4 data input device, 5 display device, 6 melody & chord data memory, 7 chord & chord progression memory, 8 automatic accompaniment device, 9 bus, 10 HDD, 11
CD-ROM drive, 12 communication interface, 21 communication network, 31 server computer

Claims (2)

[Claims] 1. A first step of inputting performance data including pitch information, and a second step of inputting a code corresponding to a section of the performance data input by the first step, Chord detection comprising a third step of detecting a chord corresponding to each section of the musical performance data from the musical performance data input in the first step and the chord input in the second step. Method. 2. Performance data input means for inputting performance data including pitch information, chord input means for inputting a chord corresponding to a section of the performance data input by said performance data input means, and said performance. A chord detection device comprising chord detection means for detecting chords corresponding to respective sections of the performance data from the data and the inputted chords.