JP2733938B2 - Melody analyzer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a melody analyzer for automatically analyzing a melody, and more particularly to a melody analyzer capable of evaluating a harmony progress. [Background] When composing a song composed of a plurality of melody lines (melody lines), it is necessary to consider various matters that were unnecessary or unconscious in composing a single line.
One of the tasks is to check whether the song complies with the rules for harmony progression. This operation is not easy and requires a considerable amount of time and effort, unless you are a very skilled composer. Therefore, it is very significant to develop a melody analyzer that can reduce the burden on the composer for such work. [Object of the Invention] That is, an object of the present invention is to provide a melody analyzer capable of automatically evaluating the harmony progression of a song. According to the present invention, a melody feature parameter is generated at random, and a first melody line and a second melody line are generated based on a melody feature parameter and a chord progression. An automatic composition means for generating a melody line;
First pitch difference calculating means for calculating the pitch difference between the current and previous note on the first melody line, and second calculating the pitch difference between the current and previous note on the second melody line
A pitch difference calculating means for comparing a pitch difference from the first pitch difference calculating means with a pitch difference from the second pitch difference calculating means, and detecting a direct progress according to a result of the comparison; Detecting means;
Third pitch difference calculating means for calculating a pitch difference between a current note on the first melody line and a current note on the second melody line; A melody analyzer comprising: a prohibited straight-line progression determination unit that determines based on a pitch difference from a pitch difference calculation unit. According to this configuration, it is possible to automatically determine whether or not a prohibited straight line progression that does not sound well is included between the first and second melody lines composed by the automatic music composition means. If the automatic music composition means is restarted when the prohibited straight-line progression is detected, the first and second melody lines having no prohibited straight-line progression can be easily composed automatically. Further, according to the present invention, melody data providing means for providing data representing the first melody line and data representing the second melody line, and data of each melody line along the music time axis of each melody line. Check,
Both line note start detecting means for detecting when a new note starts on both the first and second melody lines, and a new note on the first melody line in response to the detecting operation of the both line note start detecting means. A first pitch difference calculating means for calculating a pitch difference between the note and the immediately preceding note; and a new note and a preceding note in the second melody line in response to the detecting operation of the both-line note start detecting means. The second pitch difference calculating means for calculating the pitch difference between the first pitch difference calculating means and the pitch difference from the second pitch difference calculating means are compared with each other. In response to the detection of the straight line progress detection means and the double line note start detection means for detecting the straight line progression,
Third pitch difference calculating means for calculating a pitch difference between a new note on the first melody line and a new note on the second melody line; and determining whether or not the straight-line progression is prohibited straight-line progression. A melody analyzer comprising: a prohibited straight-line progression determination unit that determines based on a pitch difference from a pitch difference calculation unit. According to this configuration, the data of each melody line is checked along the music time axis, the position at which a note starts simultaneously on both lines is detected, and each time, the pitch data around the position is accessed to go straight. Is checked, and if it is a straight line progression, whether or not the straight line progression is prohibited straight line progression is calculated by calculating the pitch difference between lines at that position and based on the calculation result, a simple In spite of the configuration, it is possible to reliably detect the forbidden straight line progress. This configuration is particularly useful for beginners and learners who are not rich in musical experience, and can inform the learner in advance of an acoustic test of a prohibited straight-ahead location that has sound problems. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to an automatic music composer, and its entire configuration is shown in FIG. The melody 1 generating device 1 and the melody 2 generating device 2 generate a melody 1 and a melody 2 respectively, and are of the type shown in Japanese Patent Application Nos. 62-86571 and 62-121037 by the present applicant. Composer can be used. Each of the melody generating devices 1 and 2 generates a melody from the melody characteristic parameter and the chord progression, and can change the melody to be generated by changing the melody characteristic parameter to be used. Each time it is started, an internal random number generator (not shown) operates to generate changed melody feature parameters. The harmony progression / concordance evaluation unit 3 includes the melody 1 generation device 1
The melody 1 and the melody 2 generated by the melody 2 generating device 2 are evaluated. In this example, the degree of compatibility between the melody 1 and the melody 2 is evaluated using the consonance memory 4. The harmony progression memory 5 is used to check whether or not the harmony progression of the melody 1 and the melody 2 includes the forbidden direct progression harmony progression. The evaluation result of the harmony progression / concordance evaluation section 3 is output to the monitor 6. If the evaluation result is not preferable, the user activates the melody 1 generation device 1 and the melody 2 generation device 2 again via the input device (not shown). As a result, each of the generating devices 1 and 2 generates a melody feature parameter different from the last time by the random number generator. FIG. 2 shows the consonance memory 4 and the forbidden harmony progression memory 5.
The following shows an example of data. The head address of the consonance memory 4 stores the number of data, and the subsequent address stores consonance data for two musical intervals. The address i corresponds to two tones having a pitch of semitone x (i-1), and in the example of the figure, a semitone x 0 (same tone), a semitone x 5 (complete fourth), and a semitone x 7 (complete 5) Degree), which is assigned a value of “3” indicating the best compatibility, is minor 2 degrees, major 2 degrees, reduced 5 degrees, and minor 7
"1", indicating that the concordance is the worst for degrees and degrees 7
, And an intermediate value of “2” is assigned to the other pitches. In the forbidden harmony progression memory 5, the number of data is stored at the head address, and the data indicating the frequency (pitch difference) of the forbidden straight-line progression is stored at the subsequent address. For example, data having a value of “0” represents perfect 1 degree, which means that perfect 1 degree straight progression is prohibited harmony progression in relation to the evaluation unit 3. FIG. 3 shows the configuration of the evaluation unit 3. Front-back pitch difference calculator 31
Calculates the pitch difference between the sounds before and after the melody 1, and the front and rear pitch calculating unit 32 calculates the pitch difference between the sounds before and after the melody 2. On the other hand, the inter-line pitch calculating unit 33 calculates the pitch difference between the melody 1 and the melody 2 at the same time. The pitch difference between the melody 1 and the melody 2 at each time calculated by the inter-line pitch difference calculation unit 33 is passed to the consonance accumulation unit 34. The consonance accumulating section 34 reads consonance data corresponding to the given pitch difference from the consonance memory 4 and accumulates the data to calculate the consonance between the melody 1 and the melody 2. Melody 1 is calculated based on the calculation results of the above elements 31, 32, and 33.
And melody 2 represent a harmony progress. The straight progress detection unit 35 is to detect the straight progress that can be included in the harmony progress and the frequency of the straight progress. here,
The straight progression is a progression when the direction of the change of the pitch of the melody 1 and the direction of the change of the pitch of the melody 2 are the same. The rectilinear progress from the rectilinear progress detection unit 35 and the frequency thereof are sent to the prohibition chord progress detection unit 36. The prohibition harmony progress detection unit 36
In order to check whether the straight progression of the given frequency is a prohibited harmony progression, the data in the prohibited harmony progression memory 5 is searched. If there is data of the matching frequency, it means that the prohibited harmony progress has been detected. FIG. 4 shows the general flow of the present embodiment. First, a melody 1 is generated by the melody 1 generation device 1 (4-
1) Next, the melody 2 is generated by the melody 2 generating device 2 (4-2). Subsequently, the harmony progression / concordance evaluation unit 3 executes the evaluation for the melody 1 and the melody 2. Prompts the user for input corresponding to the evaluation result (4-
4) If it is not OK, return to 4-1 and repeat the generation of the melody. FIG. 5 shows the details of the evaluation 4-3. In the figure, i is a counter for counting the length from the beginning of the section to be evaluated in increments of the basic unit time, OC1 (2) is a counter for counting note numbers in the evaluation section of melody 1 (2), lC1
(2) is a counter for counting the length of the note of melody 1 (2), and fl1 (2) is a flag set to "1" at the start position of the note of melody 1 (2) (see FIG. 5). ). First, the data of the consonance memory 4 and the forbidden harmony progression memory 5 are read (5-1). Details of this data reading are shown in FIG. As a result, the congruence data for the interval indicated by i is stored in the register of hamoi,
In palln, the number of prohibited harmony straight progress patterns is stored, and in palli, the frequency of each prohibited pattern is stored. Next, initialization 5-2 is performed. The details of this processing are shown in FIG. Here, the calculated total length Shigumamr ₁ full length Shigumamr ₂ melody 2 melody 1, the shorter is stored in the register length. This length data is used to check the completion of the evaluation processing of FIG. Furthermore, note counters OC1, OC2, pitch counters lC1, lC2,
The evaluation value register is initialized. At 5-3, the counter i of the reference unit tone length is initialized to "1", and at 5-17, the loop of 5-4 to 5-17 is repeated until i> length. A flag fl indicating whether a new note has been entered in 5-4.
1, fl2 is reset to "0", and the note length counters IC1 and IC2 of the notes of the melody 1 and 2 are incremented in 5-5. Next, it is checked whether or not the value of the note length counter lC1 of the note of melody 1 has reached the note length mr1 _0C of the note of melody 1 of interest, that is, whether or not the note of melody 1 should be advanced to the next. (5-6) If the condition is satisfied, the note counter OC1 of melody 1 is incremented, and fl1 is set to "1" to indicate that a new note has been entered (5-8). The same operation is performed for the melody 2 (5-8, 5-9). In 5-10, the pitch difference between the notes of the melody 1 and the melody 2 of interest is calculated and set in the register S1, and the pitch of the note of the melody 1 of interest and the note immediately preceding it is calculated. The difference is calculated and set in the register S2, the pitch difference between the note of the melody 2 of interest and the note immediately before it is calculated and set in the register S3. At 5-11, the corresponding consonance data is extracted from the contents of the register S1 and added to the accordion data accumulator. At 5-12, it is checked whether or not the notes of the melody 1 and the melody 2 are both the starting positions by fl1 = fl2 = 1, and when they are satisfied, it is checked at 5-13 whether or not they are orthogonal. This check is performed by, for example, checking whether | S2−S3 | ≦ 1, that is, whether or not the difference between the pitch change of the melody 1 and the pitch change of the melody 2 is a minor second or less. Instead, S2> 0 and S3> 0 or S2 <0 and S3
Whether or not <0 may be established may be checked. When the orthogonal relationship is established, the process proceeds to 5-14, where it is checked whether the orthogonal relationship is a prohibited orthogonal relationship. This is performed by checking whether or not data matching the pitch difference S1 between the sounds of the melody 1 and the melody 2 is included in the set of the prohibited frequency data palli. When the condition holds, the flag NG is set to “1” to notify later that there is a prohibited pattern (instead of this,
The counter may count the number of times that the condition is satisfied.) Increment the counter i of the reference note length (5-1)
6), 5 until the value exceeds the value of length
-4 is repeated. The melody 1 generation device 1 and the melody 2 generation device 2
For, any other suitable melody generator can be used. For example, as the melody 2 generation device 2, the melody 1 generated by the melody 1 generation device 1 is first-order converted (for example, the melody 1 is shifted backward by one bar to shift the pitch data to 5 or 4 degrees). ) Things can be used. Further, in the present invention, the melody generating device is not always necessary, and the melody 1 and 2 may be created by the user. [Effects of the Invention] As described above in detail, according to the present invention, the melody feature parameter is randomly generated by the automatic music composition means, and the first melody line is generated based on the melody feature parameter and the chord progression. A second melody line is generated, a pitch difference between a current note and a previous note in the generated first melody line is calculated by first pitch difference calculating means, and a current pitch and a current pitch in the generated second melody line are calculated. The pitch difference of the note is calculated by the second pitch difference calculating means, and the pitch difference from the first pitch difference calculating means is compared with the pitch difference from the second pitch difference calculating means. (Linear progress detection means), and calculates the pitch difference between the current note on the first melody line and the current note on the second melody line (third pitch difference calculation means). ), Detected direct progress is prohibited Whether or not the vehicle travels straight is determined based on the pitch difference from the third pitch difference calculating means (prohibited straight-traveling determining means). Therefore, it is possible to automatically determine whether or not a forbidden straight-line progression is not included between the melody lines composed by the automatic music composition means, and by detecting the prohibited straight-line progression by operating the automatic music composition means again. In this way, it is possible to easily compose a plurality of melody lines without a prohibited straight line. Further, according to the present invention, when the data representing the first melody line and the data representing the second melody line are provided (melody data providing means), each melody along the music time axis of each melody line is provided. The data of the line is examined, and when a new note starts on both the first and second melody lines (position) is detected (both line note start detecting means), and in response to this detection operation, the first and second melody lines are detected. The pitch difference between the new note and the immediately preceding note in the second melody line is calculated (first and second pitch difference calculating means), and the pitch difference from the first and second pitch difference calculating means is calculated. Comparing with each other, detecting a straight-line progression based on the result of the comparison (direct-movement detecting means), and responding to the detection operation, by comparing the new note of the first melody line with the new note of the second melody line. Calculate the pitch difference (third pitch difference Detecting means) detecting the straight traveling is determined based on whether or not the prohibition Direct progresses to the pitch difference from the third pitch difference calculating means (prohibiting direct progress discriminating means).
Therefore, it is possible to reliably detect the prohibited straight-ahead progression with a simple configuration. This configuration is particularly useful for beginners and learners who are not rich in musical experience, and can inform the learner in advance of a sound-problematic prohibited straight line progression prior to the auditory test. Therefore, the user can easily know whether or not the melody progression of the two melody lines is good or bad from the analysis result of the melody analysis device according to the present invention. As a result, the burden on the user for checking the progress of the harmony is greatly reduced, and a song that complies with the rules for the progress of the harmony can be created with less effort.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of an embodiment in which the present invention is applied to an automatic composer, FIG. 2 is a diagram showing data examples of a consonance memory and a forbidden harmony progression memory, FIG. Is a block diagram of the harmony progression / concordance evaluation unit, FIG. 4 is a flowchart showing the overall operation of the embodiment, FIG. 5 is a flowchart of the evaluation, FIG. 6 is a diagram showing the operation of the counter, and FIG. FIG. 8 is a flowchart of data reading, and FIG. 8 is a flowchart of initialization. 3: Harmonic progression / concordance evaluation unit, 5: Prohibition harmony progression memory, 31, 32 ... Front-back pitch difference calculation unit, 33 ... Line-to-line pitch difference calculation unit, 35 ... Straight-line progression detection Section, 36 ... Prohibited harmony progress detection section.

Claims (1)

(57) [Claims] Automatic melody generating means for generating a melody feature parameter as a random number and generating a first melody line and a second melody line based on the melody feature parameter and the chord progression; current and previous notes in the first melody line First pitch difference calculating means for calculating the pitch difference between the first and second notes, second pitch difference calculating means for calculating the pitch difference between the current note and the immediately preceding note on the second melody line, and first pitch difference calculating means And a pitch difference from the second pitch difference calculation means, and based on the result of the comparison, a straight progress detection means for detecting a straight progress, and a current note in the first melody line. A third pitch difference calculating means for calculating a pitch difference from a current note in the second melody line; and a pitch difference from the third pitch difference calculating means for determining whether or not the straight-line progression is prohibited straight-line progression. Prohibition determined based on Melody analyzer characterized by having a a direct progress discriminating means. 2. Melody data assigning means for assigning data representing the first melody line and data representing the second melody line; and examining the data of each melody line along the music time axis of each melody line. A two-line note start detecting means for detecting when a new note starts at the melody line, and a first note in response to the detecting operation of the two-line note start detecting means.
A first pitch difference calculating means for calculating a pitch difference between a new note and a preceding note in the melody line of the second melody line;
A second pitch difference calculating means for calculating a pitch difference between a new note and the immediately preceding note in the melody line of the melody line, and a pitch difference from the first pitch difference calculating means and a second pitch difference calculating means. A linear progression detecting means for comparing the pitch difference with the pitch difference and detecting a linear progression according to the comparison result;
A third pitch difference calculating means for calculating a pitch difference between a new note in the melody line and a new note in the second melody line; and a third pitch determining whether or not the straight-line progression is prohibited straight-line progression. A melody analyzer comprising: a prohibition straight-line progression determination unit that determines based on a pitch difference from a difference calculation unit.