JP2894178B2 - Performance detection method in performance information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rendition style detection method for detecting a rendition style in performance information from performance information including pitch information of music.

[0002]

2. Description of the Related Art Conventionally, some electronic musical instruments have a so-called automatic accompaniment function for performing an automatic accompaniment in accordance with a performance played on a keyboard. This type of electronic musical instrument performs the following chord detection based on performance information input from the keyboard, that is, a key code of a played key, in order to perform a chord performance with an accompaniment sound.

A chord is detected only when a plurality of keys are depressed simultaneously (Japanese Patent Publication No. 62-33594). Chords are detected only when the key is strongly pressed (Japanese Patent Publication Sho 62-
No. 33595). One key is virtually divided into a left key range on the low note side and a right key area on the high note side, and a chord is detected based on a key code of a key pressed in the left key range. Using a plurality of keys respectively corresponding to a plurality of parts, performing a plurality of parts and performing different processing for each input part, and detecting a chord from the accompaniment part.

However, in this case, a chord can be detected from a very simple performance, but it is difficult to accurately detect a chord from a normal performance. In the case of, the performance must be performed with a strong depressing key for detecting a chord, which may result in an unnatural performance. Further, in the case of (1), there is a problem that the key range in which each part is played is limited, and the performance itself is limited. In this case, the number of keyboards increases, making it difficult to perform. In addition, since a plurality of keys are required, the musical instrument itself becomes expensive.

[0005]

As described above, conventionally,
It has been difficult to accurately detect chords from natural performances. However, if the performance style can be detected from the performance information,
Chord detection according to this playing style can be performed, and the detection accuracy of chord detection can be increased. In addition, if the playing style can be detected, the performance information can be appropriately decomposed into parts even when performing automatic arrangement or the like. An object of the present invention is to make it possible to detect a playing style of performance information from performance information.

[0006]

Means for Solving the Problems A method for detecting a playing style in performance information according to the present invention, which has been made to solve the above-mentioned problems, comprises:
Performance information including a plurality of pitch information is input, and a strong beat and a weak beat in a bar of the performance information, a pitch difference between pitch information before and after in the performance information, and a pitch at the same timing. The performance style of the performance information is detected based on the number of pieces of information and the pitch difference of the pitch information at the same timing.

[0007]

[Function] The playing method in the performance information includes a strong beat and a weak beat in a bar of the performance information, a pitch difference between pitch information before and after in the performance information, the number of pitch information at the same timing,
A characteristic appears in the pitch difference of the pitch information at the same timing. The performance style detection method for performance information according to the present invention detects a performance style based on such information.

[0008]

FIG. 1 is a block diagram of an electronic musical instrument to which a playing style detection method in performance information according to an embodiment of the present invention is applied.
U1 controls the entire electronic musical instrument using the working area of the working memory 3 based on the control program stored in the program memory 2, and performs keyboard performance by operating the keyboard 4 and performance information input from the keyboard 4. The chords are divided into parts, chords are detected based on the parts, and automatic accompaniment is performed based on the accompaniment patterns stored in the accompaniment pattern memory 5 and the detected chords. The accompaniment pattern memory 5 stores a plurality of accompaniment patterns according to the style of the music and the playing style (mode).

The CPU 1 detects a key event of the keyboard 4, captures a key code corresponding to the key having the key event together with a key-on signal or a key-off signal, and outputs the key code and a note-on or note-off to the sound source 6 to generate a keyboard. Performs sound generation processing and mute processing corresponding to the performance. Note that the sound source 6 generates a tone signal corresponding to the input key code, and the tone signal is output to the sound system 7. The sound system 7 performs D / A conversion of the tone signal.
Performs amplification and generates musical tones.

The operation switch 8 is used for starting / accompaniment of automatic accompaniment.
There are provided various switches such as a start / stop switch for specifying a stop, a key setting switch for specifying a tonality, a switch for selecting a style and a tempo of an automatic accompaniment, and a switch for setting a tone color of the sound source 6. The switch operation event is captured by the CPU 1,
1 performs processing corresponding to each switch event.

The CPU 1 sets the tempo set by the operation switch 8 in the timer 9, and the timer 9 outputs 96 tempo clocks per bar according to the set tempo.
Occurs in PU1. The CPU 1 performs an interrupt process based on the tempo clock, and performs a group analysis in which a key code generated on the keyboard 4 is assigned to a part corresponding to the performance method while detecting a rendition style based on a key code input from the keyboard 4. .

The CPU 1 detects a chord based on the result of the group analysis for each interruption process, converts the key code of the accompaniment pattern read from the accompaniment pattern memory 5 into a pitch according to the detected chord, and outputs a tone to the sound source 6. Automatically accompaniment by outputting the key code and note-on or note-off with high conversion. The CPU 1 counts the tempo clock from the start of the automatic accompaniment to detect the timing of a strong beat or a weak beat in a measure and the timing of a measure line (measure head).

Here, in the group analysis of this embodiment,
A melody voice part that takes a melody in the upper voice part, a melody chord voice part that adds a harmony to the melody, a bass voice part that takes a bass in the lower voice part, and a bass chord voice that gives a harmony to the bass. Disassembled into four parts.

[0014] The judgment conditions for decomposing into four parts in this group analysis include the number of simultaneous key presses, whether or not the current timing is the beginning of a bar, whether the current timing is a strong beat or a weak beat, Arpeggios, such as the pitch with the previous bass voice,
This is a combination of a plurality of conditions corresponding to each of the chord and normal playing styles, and determines to which part the current key code belongs according to these conditions. Therefore, these four parts are not fixed in range but change in accordance with performance information.

FIG. 2 is a diagram showing an example of a playing style. Same figure
(A) shows the arpeggio playing style, and (B) shows the chord playing style.For example, in the arpeggio playing style, the chord constituent sounds tend to be dispersed in time, and in the chord playing style, the chord constituent sounds tend to be played simultaneously. is there. Therefore, it is determined whether or not a large number of tones are depressed chords (referred to as block chords) at the same time as in this chord playing style and used for detecting the playing style.

In the arpeggio method, the base sound is not limited to the root of a chord, but a strong beat sound that tends to be a bass voice portion is used as a base sound, and the root sound of a chord is used as a base sound in a chord method. In this embodiment, the method of selecting a bass sound is also switched in accordance with this playing style. In this embodiment, for example, a so-called slide playing method in which a bass sound is played on a strong beat and a block chord is played on a weak beat is an arpeggio playing method.

In this embodiment, when the key code is decomposed into the four parts, the relationship between each part and the key code is represented by a list structure of the following equation (1). _{[[A 1]. [B} 1 .b 2. ...]. [C ₁ .c ₂ ...]. [D ₁ .d ₂ ...]] (1) where “[” and “]” are symbols that enclose each element of the list,
"." Symbols to separate each element of the list, a ₁ key code (bass part is one tone) of bass part, b _1, b _2, etc. bass chord part keycode, c _1, c ₂ Etc. are the key codes of the melody voice part, d ₁ , d _2, etc. are the key codes of the melody voice part. Hereinafter, it is referred to as “all analysis list”).

While assigning key codes to each part by group analysis according to the progress of the performance,
If there is a key code in the base code voice part, chord detection based on the base code voice part is performed, and if there is no key code in the base code voice part, chord detection based on the key code of the melody code voice part is performed, and the melody code voice part is detected. If there is no key code, a chord is detected based on the key code of the melody voice part.

FIG. 3 is a flowchart of a main routine of the control program, and FIGS. 4 to 11 are flowcharts of an interrupt processing routine and a subroutine. The operation of the embodiment will be described based on each flowchart. In the following description, the key code input from the keyboard will be referred to as "input sound", and the key code which has become an element of the list of each part will be referred to as "detection sound", as appropriate, as necessary.

In the flowchart, "bass voice" is "B" and "bass chord voice" is "BC".
The "melody chord voice" is referred to as "MC" and the "melody voice" is referred to as "M". Further, in the following description and each flowchart, each register, flag, list, and the like are represented by the following labels, and their contents are represented by the same label unless otherwise specified.

BCB: previous input sound BS: base sound BF: block flag CLK: tempo clock mode: flag indicating mode (playing style) (A = arpeggio, C = chord, N = normal) NT: input sound NT: 1 Input sound to be analyzed at the time of sound analysis NTL: Key press lower sound at the time of analysis of three sounds NTM: Key press middle sound at the time of analysis of three sounds NTH: Key press upper sound at the time of analysis of three sounds PB: Previous bass voice Part PBC: Previous bass chord voice PMC: Previous melody chord voice PM: Previous melody chord PBCTP: Highest tone of previous bass chord voice PMBT: Last tone of last melody chord voice and melody voice RUN: Flag indicating start / stop of automatic accompaniment

When the process of the main routine shown in FIG. 3 is started by turning on the power, initial settings such as resetting of flags and registers are performed in step A1, and the presence or absence of a key event on the keyboard 4 is determined in step A2. If there is no key event, the process proceeds to step A8, and if there is a key event, it is determined in step A3 whether or not it is a key-on event. If it is a key-on event, a sound generation process is performed in step A4, and a key code is added to the key code list in step A5, and the process proceeds to step A8. If the event is not a key-on event, the mute process is performed in step A6, the key code is deleted from the key code list in step A7, and the process proceeds to step A8.

In step A8, it is determined whether or not there is an operation event of the start / stop switch of the operation switch 8. If there is no event, the process proceeds to step A13. If there is an operation event, the flag RUN is inverted in step A9, and step A10 is executed. It is determined whether or not “RUN = 1”. Then, if "RUN = 1", step A1
1 to set the read pointer of the accompaniment pattern, the tempo clock CLK and the block flag BF.
Is reset and the process proceeds to step A13. Also, "RUN
If "= 0", the accompaniment sound is muted in step A12, and the process proceeds to step A13.

In step A13, operation events such as a key setting switch, a style selection switch, and a tempo setting switch of the operation switches 8 are detected, and if there is an operation event, a setting process corresponding to each operation event is performed in step A14. Other processing is performed in A15, and the process returns to step A2.

With the above processing, the sounding and silencing of the keyboard performance is performed, the start / stop of the automatic accompaniment by operating the start / stop switch of the operation switch 8, the setting of the tonality, the selection of the style, and the setting of the tempo. Etc. are performed.

The interrupt process shown in FIG. 4 is started every 1/96 bar by the tempo clock from the timer 9.
In step B1, it is determined whether or not "RUN = 1". If "RUN = 1", the process returns to the original routine.
If "RUN = 1", then in step B2, "CLK m
od 12 = 0 ”is determined, and“ CLK m
od 12 = 0 ”, the process proceeds to step B14,
If “CLK mod 12 = 0”, the group analysis processing of FIG. 5 is performed in step B3, and chord detection is performed based on the group analysis result in step B4 and subsequent steps. That is, the group analysis and chord detection processing are performed for each eighth note.

When the group analysis is completed in step B3, it is determined in step B4 whether or not a detected sound is present in the base chord voice portion.
The chord is detected by the key code of the bass chord voice part. If there is no detected sound in the bass chord voice, step B6
Is used to determine the presence or absence of a detected sound in the melody chord voice portion, and if there is a detection sound in the melody chord voice portion, a chord is detected from the key code of the melody chord voice portion in step B7.

Further, if there is no detected sound in the melody chord voice part, it is determined in step B8 whether or not there is a detection sound in the melody voice part. To detect. And
If there is no detected sound in the melody voice part, the previous chord is continued and the process proceeds to step B14.

When a chord is detected by the bass chord voice portion in step B5, it is determined in step B10 whether or not the bass chord voice portion has three or more sounds. If the chord is three or more, "mode = A" is determined in step B11. Or not, that is,
It is determined whether the mode is arpeggio or not.
= A ", the key code of the bass voice is stored in the register BS in step B12, and the flow advances to step B14.

When there are no more than three tones in the bass chord voice (step B10), when the mode is not arpeggio (step B11), when a chord is detected by the melody chord voice in step B7, and when the melody is detected in step B9. When the chord is detected by the voice part, the root of the detected chord is stored in the register BS in step B13, and the process proceeds to step B14.

With the above processing, the detected sounds of the base chord voice and the melody chord voice are used for chord detection based on the entire analysis list obtained by the group analysis, and the base chord voice, the melody chord voice and the melody chord are used. Chord detection is performed by giving priority to voice parts.

If the detected sound of the bass chord voice is three or more and the mode is arpeggio, the bass sound BS
, The key code of the bass voice is used, otherwise the root of the detected chord is used as the bass sound. That is, as described with reference to FIG. 2, in the case of the arpeggio playing method, the first sound is used as the base sound, and in the case of the chord playing method, the root sound of the chord is used as the base sound.

In step B14, the style, mode
And CLK are read and reproduced based on and CLK. The accompaniment pattern is provided for each style and mode. The accompaniment pattern is selected according to the style and mode at that time, and is read out based on CLK. The read keycode of the accompaniment pattern is reproduced by converting the pitch according to the key and the detected chord. Further, the bass pattern is reproduced after converting the pitch according to the bass sound BS. Then, in step B15, the tempo clock CLK is incremented and the process returns to the original routine.

In the group analysis of FIG. 5, it is determined in step C1 whether or not "BF = 1". If "BF = 1", then in step C2, "the number of input sounds is 0 or the input sound is It is determined whether or not the condition "included" is satisfied. If the condition is satisfied, the process proceeds to step C9. If the condition is not satisfied, the block flag BF is cleared in step C3 and the process proceeds to step C9. That is, if there is no current input sound or the current input sound is included in the previous input sound, the block flag BF is set to “1” as it is, and if the input sound is a new sound, the block flag BF is set to “1”. BF is set to “0”.

If it is not BF = 1 at step C1, it is determined at step C4 whether or not the input sound is four or more. If it is four or more, the process proceeds to step C7. If not, the process proceeds to step C5. It is determined whether there are three input sounds. If it is not three, proceed to step C9. If it is three, in step C6, "the upper two pitches (pitch difference) are 8 or 6".
It is determined whether or not the condition is satisfied. If the condition is satisfied, the process proceeds to step C9. If the condition is not satisfied, the block flag BF is set to “1” in step C7. The value is stored in the register BCB, and the process proceeds to Step C9.

According to the above processing, if the number of input sounds is four or more, it is determined to be a block code, and if the number of input sounds is three, it is determined to be a block code with a condition. For example, when three notes are not a block chord, such as when a single bass note and two melody notes are played at the same time (when the pitch of the upper two notes is 8th or 6th), do not judge it as a block chord. Has become.

In step C9, the detected sound (melody sound) of the previous melody voice part is put on the list PM, and the detected sound (melody chord sound) of the previous melody chord voice part is put on the list PM.
C, the last detected sound of the base chord voice (base chord sound) is stored in a list PBC, and the last detected sound of the base chord voice (bass sound) is stored in a register PB. Step C1
Go to 0.

In step C10, the number of input sounds is determined, and if there is no sound (no input sound), step C11 is executed.
The following processing is performed. If there is one sound, the (input sound) is stored in Nt in step C15, the one-sound analysis processing of FIG. 6 is performed in step C16, and if there are three sounds, the processing in FIG.
Is performed, and otherwise, step C1 is performed.
In step 8, analysis is performed for two or four or more sounds, and the process returns to the original routine.

In step C11, it is determined whether or not the current timing is a bar head.
12, the entire analysis list is changed to [[PB]. []. []. []]
To enable only the previous bass sound and return to the original routine. If it is not the bar, it is determined in step C13 whether or not the current timing is a weak beat. If it is a weak beat, the process returns to the original routine. If it is not a weak beat, that is, if it is a strong beat, In step C14, all the analysis lists are changed to [[]. []. []. []] (All empty list) and return to the original routine.

In the one-sound analysis of FIG. 6, the result of the previous analysis is stored in the list PNSQ in step D1, the highest sound of the bass chord voice part is stored in the register PBCTP, and the presence or absence of the previous base sound PB is determined in step D2. If there is no previous bass sound PB, it is determined in step D3 whether or not "Nt ≤ G3 code (key code)", that is, the input sound NT is a "one-point sound" or lower. It is determined whether or not.

If "NT≤G3 code", NT is regarded as a bass sound, and all analysis lists are set to [[NT]. []. []. []] And mod
Set e to normal (N) and return to the original routine. If “NT ≦ G3 code” is not satisfied, NT is regarded as a melody sound, and the entire analysis list is set to [[]. []. []. [NT]] and returns to the original routine.

If there is a previous bass sound PB in step D2, it is determined in step D5 whether or not the current timing is the beginning of a measure. If the present timing is the beginning of a measure, the processing after step D9 is performed. If not, it is determined in step D6 whether or not the current timing is a strong beat.
In step 7, the processing of the strong beat analysis of FIG. 7 is performed, and the process returns to the original routine. If it is not a strong beat, in step D8, the process of the weak beat analysis of FIG. 8 is performed, and the process returns to the original routine.

Step D9 and subsequent steps are processing when the current timing is at the beginning of a bar.
Then, it is determined whether or not “NT = PB”, that is, whether or not the input sound is the same as the previous bass sound. If it is the same, the process of step D10 is performed. It is determined whether the condition of Nt ≦ C4 code and Nt <PB + 12 is satisfied.

If the condition is satisfied in step D11, the process proceeds to step D10. If the condition is not satisfied, step D12 is performed.
It is determined whether or not the condition of "Nt> C4 code and Nt <PBS + complete 5 degrees" is satisfied. If the condition is satisfied in step D12, the process proceeds to step D10. If the condition is not satisfied, the input sound NT is determined to be a melody sound.
13, the entire analysis list is [[]. []. []. [NT]]
And set the mode to normal (N) and return to the original routine.

As described above, in the one-sound analysis, if there is no previous bass sound, it is assigned to the bass voice or melody voice based on the G3 code. Analysis is performed under different conditions depending on whether or not there is. At the beginning of the measure, the previous bass sounds PBS and C
The analysis is performed under the conditions corresponding to the four codes, and is assigned to the bass voice or the melody voice. If there is a previous bass sound and the current timing is not the beginning of a bar, the analysis is performed according to whether the current timing is a strong beat timing or a weak beat timing.

In the processing of the strong beat analysis of FIG.
To determine whether or not the input sound NT is the same as the previous bass sound PB. If the input sound NT is the same, the entire analysis list is set to [[PB]. PBC. []. []] Is returned to the original routine. In other words, if the sound is the same, the bass sound and the bass chord sound are left as they were last time.

If they are not the same, "P
It is determined whether or not the condition of B−second major ≦ NT <PB + second major is satisfied. If the condition is satisfied, that is, if the condition is within the vicinity of the previous bass sound, the input sound NT is regarded as the base sound. Considering all the analysis lists in step E4 as [[NT]. [].
[]. []] Is returned to the original routine.

Also, "PB-length 2 degrees≤NT <PB + length 2
If the condition of “degree” is not satisfied, “NT <P” is determined in step E5.
It is determined whether or not the condition of "B-2 degrees" is satisfied. If the condition is satisfied, the process proceeds to step E6, and if not, the process proceeds to step E10.

At step E6, it is determined whether or not "BF = 1". If "BF = 1", the input sound NT is regarded as a base sound, and at step E7 the entire analysis list is changed to [[N
T]. []. []. []] And mode is changed to arpeggio (A), and the process returns to the original routine. Also,
If not "BF = 1", the previous bass sound PB is added to the previous bass chord voice part PBC in step E8 and stored in the list CBCNT. In step E9, the entire analysis list is [[NT]. CBCNT. []. []] And change the mode to code (C) and return to the original routine.

The processing after step E10 is performed at step E10.
5 is a case where the condition of “NT <PB−2 degrees of length” is not satisfied. First, it is determined whether or not the condition of “NT ≦ PBCTP” is satisfied. If the condition is satisfied, the process proceeds to step E12. If it is not satisfied, that is, if the input sound NT is higher than the highest tone of the previous bass chord voice, step E11 is executed.
Then, the arpeggio expansion process shown in FIG. 9 is performed, and the process returns to the original routine.

In step E12, it is determined whether or not "mode = C". If "mode = C", NT is regarded as a melody sound, and in step E13, NT is higher than the previous bass chord voice by NT or more. Remove sound and list CBC
NT and stores all the analysis lists in [E
B]. CBCNT. []. [NT]] and returns to the original routine.

In step E12, "mode = C"
If not, it is determined in step E15 whether or not NT is included in the PBC, and if it is included, the entire analysis list is set to [[PB]. PBC. []. []] And returns to the original routine. If NT is not included in the PBC, NT is regarded as a bass sound and the entire analysis list is set to [[NT]. []. []. []] And change the mode to code (C) and return to the original routine.

In the above-mentioned processing of the strong beat analysis, if the input sound NT is higher than the highest tone PBCTP of the previous bass chord voice portion at step E10, arpeggio expansion is performed at step E11, and the input sound NT becomes the base chord voice portion. And the list of base chord voices tends to be expanded.

In the case of this strong beat analysis, step E
If the input sound NT is not included in the previous bass chord voice part at 15, the input sound NT tends to be the bass voice part at step E17.

In the processing of the weak beat analysis of FIG.
To determine whether or not the input sound NT is the same as the previous bass sound PB. If the same, the entire analysis list is set to [[PB]. PBC. []. []] Is returned to the original routine. If they are not the same, "N"
It is determined whether or not T <PB. If “NT <PB”, the process proceeds to step F4, and if “NT <PB”, the process proceeds to step F10.

In step F4, it is determined whether or not "BF = 1". If "BF = 1", the input sound NT is regarded as a base sound, and in step F5 the entire analysis list is changed to [[N
T]. []. []. []] And mode is changed to arpeggio (A), and the process returns to the original routine. Also,
If not "BF = 1", the previous bass sound PB is added to the previous bass chord voice part PBC in step F6 and stored in the list CBCNT. In step F7, the entire analysis list is set to [[NT]. CBCNT. []. []] And proceeds to step F8.

In step F8, it is determined whether or not "mode = A". If "mode = A", the process returns to the original routine. If "mode = A", the process returns to step F9.
To change the mode to code (C) and return to the original routine.

Step F10 and subsequent steps are processing in the case where "NT <PB" is not satisfied in step F3.
It is determined whether or not the condition of <NT ≦ PB + second major ”is satisfied. If the condition is not satisfied, the process proceeds to step F12. If it is within the degree, the input sound NT is regarded as the base sound, and the whole analysis list is changed to [[N
T]. []. []. []] And the mode is set to normal (N), and the process returns to the original routine.

In step F12, "NT≤PBCTP"
It is determined whether or not the condition is satisfied. If the condition is satisfied, the process proceeds to step F14. If the condition is not satisfied, that is, if the input NT is higher than the highest tone of the previous bass chord voice, the process proceeds to step F13. And then returns to the original routine.

In step F14, it is determined whether or not "mode = C". If "mode = C", NT is regarded as a melody sound, and in step F15, NT is higher than the previous bass chord voice by NT or more. Remove sound and list CBC
NT, and in step F16, the entire analysis list is set to [[P
B]. CBCNT. []. [NT]] and returns to the original routine.

In step F14, "mode = C"
If not, it is determined in step F17 whether or not NT is included in the PBC, and if it is, the entire analysis list is set to [[PB]. PBC. []. []] Is returned to the original routine. If NT is not included in the PBC, the input sound NT is added to the previous bass chord voice part PBC in step F19 and stored in the list CBCNT in step F19. NT]. CBCNT. []. []] And mode is changed to arpeggio (A), and the process returns to the original routine.

In the above weak beat analysis processing, if the input sound NT is higher than the highest tone PBCTP of the previous bass chord voice portion in step F12, arpeggio expansion is performed in step F13, and the input sound NT becomes the base chord voice portion. And the list of base chord voices tends to be expanded.

In the case of this weak beat analysis, step F
Even if the input sound NT is not included in the previous bass chord voice part in Step 17, even if Step F19 and Step F20
As a result, the input sound NT is added to the list of bass chord voices, the list of bass chord voices is expanded, and the mode tends to be arpeggio.

Further, the input sound NT tends to be the base sound by the processing of the step E17 of the strong beat analysis, but in the weak beat analysis step F20, the base sound is set to the previous base sound PB. The analysis is such that the bass sound is harder to change than the strong beat analysis.

In the arpeggio expansion process shown in FIG. 9, the previous melody chord voice part and the lowest tone in the previous melody voice part are stored in the register PMBT in step G1, and the input sound NT is changed to the previous key depression in step G2. It is determined whether or not the sound is included. If it is included, the input sound NT is regarded as a melody sound, and the entire analysis list is set to [[PB]. P
BC. []. [NT]], and returns to the original routine.

If the input sound NT is not included in the previous key depression sound, it is determined in step G4 whether or not "mode = C". If "mode = C", step G4 is executed.
3 and if not "mode = C", then in step G5, "there is a previous melody voice part PM and PMBT-N
It is determined whether or not the condition of “T ≦ NT-PBCTP” is satisfied.

If the condition is satisfied in step G5, the process proceeds to step G3. If the condition is not satisfied, "0" is determined in step G6.
It is determined whether or not the condition of <NT-PBCTP ≦ Large 6th ”is satisfied. If the condition is satisfied, the input sound NT is close to the bass chord voice (its highest sound PBCTP).
7, the input sound NT is added to the previous base chord voice part PBC and stored in the list CBCNT. In step G8, the entire analysis list is set to [[PB]. CBCNT. []. []] And mode is changed to arpeggio (A), and the process returns to the original routine. By the processing of steps G7 and G8,
Arpeggio expansion is performed.

If the condition is not satisfied in step G6, the whole analysis list is changed to [[PB]. PB
C. []. [NT]] and returns to the original routine.

In the three-tone analysis process of FIG.
1, the upper sound of three input sounds is set to NTH, and the middle sound is set to NTM.
Then, the lower tone is stored in the NTL, the lower tone NTL is stored in the register NT in step H2, and the single tone analysis of FIG. 6 is performed in step H3.

When the one-tone analysis for the lower tone NTL is completed, the result of the one-tone analysis is [[NT]. *.
[]. []] (Symbol “*” indicates a case where anything is acceptable). It is determined whether or not the condition is satisfied. If the condition is satisfied, that is, the lower note of three sounds is a bass sound and the melody code If there is no sound and melody sound, proceed to step H6,
If the conditions are not satisfied, the processing of the three-sound analysis of FIG. 11 is performed in step H5, and the process returns to the original routine.

In step H6, "the interval between three sounds is 5
It is determined whether or not the condition of “within degrees” is satisfied. If the condition is not satisfied, the process proceeds to step H8. If the condition is satisfied, the entire analysis list is set to [[NTL]. [NT
M. NTH]. []. []] And change the mode to code (C) and return to the original routine.

At step H8, it is determined whether or not the condition that "the interval between the lower two sounds of three sounds is within 5 degrees" is satisfied. If the condition is not satisfied, the process proceeds to step H10. H9, the entire analysis list was changed to [[NTL].
[NTM]. []. [NTH]] and mod
e is changed to code (C) and the process returns to the original routine.

In step H10, it is determined whether or not the condition that "the interval between the three sounds and the two sounds is within 5 degrees" is satisfied.
If the condition is not satisfied, the process proceeds to step H12. If the condition is satisfied, the entire analysis list is changed to [[NT] in step H11.
L]. []. [NTM. NTH]. []] And the mode is set to normal (N), and the process returns to the original routine.

In step H12, it is determined whether or not the condition that "the interval between the three sounds and the two sounds is 6 or 8 degrees" is satisfied. If the condition is not satisfied, the entire analysis list is checked in step H13. [[NTL]. []. []. [NTM. N
TH]], mode is set to normal (N), and the process returns to the original routine. If the condition is not satisfied in step H12, the entire analysis list is set to [[NTL]. [NTM]. []. [NTH]] and mode is changed to code (C), and the process returns to the original routine.

In the three-tone analysis of FIG. 11, it is determined in step h1 whether or not the condition that "the interval between three tones is within 5 degrees" is satisfied. If the condition is not satisfied, the process proceeds to step h3, where the condition is changed. If satisfied, the entire analysis list is set to [[PB]. []. [NTL. NTM. NT
H]. []] Is returned to the original routine.

In step h3, it is determined whether or not the condition that "the interval between the lower two sounds of three sounds is within 5 degrees" is satisfied. If the condition is not satisfied, the process proceeds to step h5. h4, the entire analysis list is changed to [[PB]. [NT
L. NTM]. []. [NTH]] and returns to the original routine.

In step h5, it is determined whether or not the condition that "the interval between three sounds and two sounds is within 5 degrees" is satisfied. If the condition is not satisfied, the process proceeds to step h7. h6, the entire analysis list is changed to [[PB]. [NT
L]. [NTM. NTH]. []] Is returned to the original routine.

In step h7, it is determined whether or not the condition that "the interval between the lower two sounds of the three sounds is within 8 degrees" is satisfied. If the condition is not satisfied, the process proceeds to step h11, where the condition is satisfied. In step h8, if the interval between the upper three sounds is 6
Degree or 8 degrees ”is satisfied, and if not, the entire analysis list is set to [[PB]. [NTL. NTM]. []. [NT
H]], and returns to the original routine. If the condition is satisfied, the entire analysis list is set to [[PB].
[NTL]. []. [NTM. NTH]] and returns to the original routine.

In step h11, it is determined whether or not the condition that "the interval between the three sounds and the two sounds is 6 or 8 degrees" is satisfied. If the condition is not satisfied, the entire analysis list is checked in step h12. [[PB]. [NTL. NTM]. [].
[NTH]] and returns to the original routine. If the condition is satisfied, the entire analysis list is changed to [[P
B]. [NTL]. []. [NTM. NTH]] and returns to the original routine.

In the three-tone analysis and the three-tone analysis, each tone is assigned to each part according to the mutual pitch (pitch difference) of the three tones, and a mode is set according to the assignment method. Similarly, analysis of two or more tones is assigned to a part according to musical conditions.

As described above, the number of simultaneous key presses of the performance information input from the keyboard 4, whether or not the current timing is the beginning of a bar, whether the current timing is a strong beat or a weak beat, The playing style is detected based on the pitch between the bass voice and the pitch of the keys that are simultaneously depressed as in the case of three-tone analysis.

In this embodiment, the performance information is grouped according to the detected playing style.
It can be decomposed into parts suitable for playing. In addition, since chords are detected based on the key codes of the parts that have been decomposed in this way, chord constituent sounds can be extracted according to the playing style, and the accuracy of chord detection can be improved.

In the above embodiment, the performance information is analyzed every eight minutes, but the analysis may be performed every time a key event occurs. The same processing can be performed not only for performance information from the keyboard, but also for performance information supplied as MIDI information or the like. Furthermore, the same processing may be performed not only on the real-time performance information but also on performance information that has already been played and stored in the memory. Further, the playing style may be detected in consideration of the note length.

[0084]

As described above, according to the performance information detecting method for performance information of the present invention, performance information including a plurality of pitch information is input, and the strong beat and the weak beat in the bar of the performance information are determined. The playing style of the performance information is determined based on the pitch difference of the pitch information at the preceding and following timings in the performance information, the number of the pitch information at the same timing, and the pitch difference of the pitch information at the same timing. Since the detection is performed, the playing style of the performance information can be detected from the performance information.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic musical instrument to which a performance style detection method in performance information according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing an example of an arpeggio playing method and a chord playing method in the embodiment.

FIG. 3 is a flowchart of a main routine in the embodiment.

FIG. 4 is a flowchart of an interrupt process in the embodiment.

FIG. 5 is a flowchart of a group analysis process in the embodiment.

FIG. 6 is a flowchart of one sound analysis processing in the embodiment.

FIG. 7 is a flowchart of a strong beat analysis process in the embodiment.

FIG. 8 is a flowchart of a weak beat analysis process in the embodiment.

FIG. 9 is a flowchart of an arpeggio expansion process in the embodiment.

FIG. 10 is a flowchart of a three-tone analysis process in the embodiment.

FIG. 11 is a flowchart of a three-tone analysis process in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... program memory, 3 ... working memory, 4 ... keyboard, 5 ... accompaniment pattern memory, 6 ... sound source,
7 ... Sound system, 8 ... Operation switch, 9 ... Timer.

Claims (1)

(57) [Claims] A performance information including a plurality of pitch information is inputted, and a strong beat and a weak beat in a bar of the performance information are equal to a pitch difference between pitch information at timings before and after in the performance information. A rendition style detection method for performance information, wherein the rendition style of the performance information is detected based on the number of pitch information at the timing and the pitch difference of the pitch information at the same timing.