The present invention relates to a musical composition processing device, and more particularly to a musical composition processing device capable of detecting tonal information based on scale information of a musical composition, and capable of searching for a musical composition by using the tonal information.
In general, a method of detecting tonal information of a musical composition is known. The tonal information indicates elements which determine an image of the musical composition (a key, for example). As an exemplary method of detecting a key of a musical composition, there is a method (a first method) in which, based on information concerning a scale of a musical composition (hereinafter, referred to as scale information), appearance probabilities of pitch names included in the scale information are calculated for each of the pitch names, and a key of the musical composition is detected by using a distribution showing the appearance probabilities of the respective pitch names (referred to as an appearance probability distribution. See
Also, in general, there is another method in which the scale information to be inputted is divided into predetermined segments, and a key of each of the segments is detected (see patent document 1, for example). In this method, the scale information of a musical composition is divided into a plurality of segments in such a manner as to determine first to fourth bars of the musical composition as a first segment, and second to fifth bars of the musical composition as a subsequent segment, for example. Thereafter, the key of each of the plurality of segments is detected. [patent document 1] Japanese Patent Publication No. 2715816
In reality, there maybe a musical composition composed in a plurality of types of keys such as a musical composition including a modulation. An appearance probability distribution of such a musical composition including the modulation is obtained by combining appearance probability distributions of the plurality of types of keys with each other. Therefore, the obtained appearance probability distribution may be different from any of the appearance probability distributions of the plurality of types of keys. In the first method, the appearance probability distribution of the musical composition is compared with those represented by the templates one by one. Thus, even when the appearance probability of the musical composition is obtained by combining the appearance probability distributions of the plurality of types of keys with each other, a key, represented by one of the templates showing an appearance probability distribution most analogous to the combined appearance probability distribution of the musical composition, is determined as the key of the musical composition. That is, in this case, the key determined as the key of the musical composition is different from any of keys included in the musical composition. Therefore, when the first method is used, the keys of a musical composition, composed in a plurality of types of keys such as a musical composition including a modulation, may be mistakenly detected.
Furthermore, in the method disclosed in patent document 1, the scale information of the musical composition is divided into the plurality of segments, and a key of each of the segments is detected. Then, a point at which the musical composition modulates is detected by a change in a key between each two of the segments. Note that a target portion in which a key is to be detected is not the entirety of the inputted scale information, but is each of the segments, having a short length, into which the scale information is divided. Specifically, when the method of patent document 1 is used to detect the modulation, the scale information must be divided into the segments each having a length corresponding to at least several bars (four bars, for example). However, when the scale information is divided into the plurality of segments, the number of notes included in a target portion, in which a key is to be detected, is decreased. That is, by dividing the scale information into the plurality of segments, the number of pieces of information included in the target portion, in which the key is to be detected, is decreased. Thus, an accuracy for detecting the key is necessarily reduced. As described above, in the method of patent document 1, the scale information must be divided into the plurality of segments, thereby reducing the accuracy for detecting the key of each of the segments.
Therefore, an objective of the present invention is to provide a musical composition processing device capable of accurately detecting tonal information of a musical composition, even if the musical composition includes a modulation.
A first aspect is a musical composition processing device which detects tonal information indicating a musical tone of a musical composition for a predetermined musical composition, comprising: an appearance probability acquiring section for acquiring a distribution showing appearance probabilities of respective pitch names included in at least a portion of the predetermined musical composition; a template storing section for storing templates, which are different from each other, each template corresponding a type of the musical composition and representing a distribution showing appearance probabilities of respective pitch names included in the type of the musical composition; a load ratio calculating section for calculating load ratios, each indicating a ratio of the distribution, which is represented by each of the templates stored in the template storing section, to the distribution acquired by the appearance probability acquiring section; and a tonal information detecting section for detecting, as the tonal information, a load ratio set comprised of the load ratios, corresponding to the templates, respectively, which are calculated by the load ratio calculating section.
In a second aspect based on the first aspect, the templates stored in the template storing section each represents a key of the musical composition, and are different from each other, and the tonal information detecting section further detects, as the tonal information, at least one of a key, tonality, tonality occupancy rate and scale of the predetermined musical composition, based on the load ratio set.
In a third aspect based on the second aspect, the tonal information detecting section detects, as the key of the predetermined musical composition, a key represented by one of the templates, stored in the template storing section, having a maximum load ratio calculated by the load ratio calculating section.
In a fourth aspect based on the second aspect, the tonal information detecting section executes, for each of a plurality of the templates having a same tonality, a process of calculating a total sum of the load ratios corresponding to the plurality of the templates having the same tonality, and detects a tonality of the plurality of the templates having a larger total sum as the tonality of the predetermined musical composition.
In a fifth aspect based on the second aspect, the tonal information detecting section executes, for each of a plurality of the templates having a same scale, a process of calculating a total sum of the load ratios corresponding to the plurality of the templates having the same scale, and detects a scale of the plurality of the templates having the largest total sum as the scale of the predetermined musical composition.
In a sixth aspect based on the first aspect, the musical composition processing device further comprises: a musical composition data storing section for storing a plurality of pieces of musical composition data in which the distribution showing the appearance probabilities is acquired by the appearance probability acquiring section for each of the plurality of pieces of musical composition data; a tonal information storing section for causing the musical composition data storing section to store, as the tonal information, at least one of the load ratio set detected by the tonal information detecting section and information calculated based on the load ratio set, so as to be associated with one of the plurality of pieces of musical composition data, stored in the musical composition data storing section, which corresponds to the at least one of the load ratio set and the information calculated based on the load ratio set; and a search section for searching, by using the tonal information, for at least one piece of musical composition data from among the plurality of pieces of musical composition data stored in the musical composition data storing section.
In a seventh aspect based on the sixth aspect, the musical composition processing device further comprises a musical composition selecting rule storing section for storing a musical composition selecting rule which associates selected musical composition information to be inputted by a user with a condition concerning the tonal information, wherein when the selected musical composition information is inputted by the user, the search section outputs, as a search result, the at least one piece of musical composition data, which satisfies the condition associated with the inputted selected musical composition information, from among the plurality of pieces of musical composition data stored in the musical composition data storing section.
An eighth aspect is a musical composition processing method used in a musical composition processing device which detects tonal information indicating a musical tone of a musical composition for a predetermined musical composition, wherein the musical composition processing device previously stores templates, which are different from each other, each template corresponding to a type of the musical composition and representing a distribution showing appearance probabilities of respective pitch names included in the type of the musical composition, the musical composition processing method comprising: an appearance probability acquiring step of acquiring a distribution showing appearance probabilities of respective pitch names included in at least a portion of the predetermined musical composition; a load ratio calculating step of calculating load ratios, each indicating a ratio of the distribution, which is represented by each of the templates stored in the template storing section, to the distribution acquired by the appearance probability acquiring step; and a tonal information detecting step of detecting, as the tonal information, a load ratio set comprised of the load ratios, respectively corresponding to the templates, which are calculated by the load ratio calculating step.
In a ninth aspect based on the eighth aspect, the musical composition processing device further previously stores a plurality of pieces of musical composition data in which the distribution showing the appearance probabilities is acquired by the appearance probability acquiring step for each of the plurality of pieces of musical composition data, and the musical composition processing method further comprises: a tonal information storing step of causing the musical composition processing device to store, as the tonal information, at least one of the load ratio set detected by the tonal information detecting step and information calculated based on the load ratio set, so as to be associated with one of the plurality of pieces of musical composition data stored in the musical composition processing device, which corresponds to the at least one of the load ratio set and the information calculated based on the load ratio set; and a search step of searching, by using the tonal information, for at least one piece of musical composition data from the plurality of pieces of musical composition data stored in the musical composition processing device.
A tenth aspect is a program to be executed by a computer of a musical composition processing device which detects tonal information indicating a musical tone of a musical composition for a predetermined musical composition, wherein the musical composition processing device previously stores templates, which are different from each other, each template corresponding to a type of the musical composition and representing a distribution showing appearance probabilities of respective pitch names included in the type of the musical composition, the program instructing the computer to execute: an appearance probability acquiring step of acquiring a distribution showing appearance probabilities of respective pitch names included in at least a portion of the predetermined musical composition; a load ratio calculating step of calculating load ratios, each indicating a ratio of the distribution, which is represented by each of the templates stored in the template storing section, to the distribution acquired by the appearance probability acquiring step; and a tonal information detecting step of detecting, as the tonal information, a load ratio set comprised of the load ratios, respectively corresponding to the templates, which are calculated by the load ratio calculating step.
An eleventh aspect is a computer-readable recording medium on which the program according to claim 10 is recorded.
A twelfth aspect is an integrated circuit which detects tonal information indicating a musical tone of a musical composition for a predetermined musical composition, comprising: an appearance probability acquiring section for acquiring a distribution showing appearance probabilities of respective pitch names included in at least a portion of the predetermined musical composition; a load ratio calculating section for calculating, for templates, which are different from each other, each corresponding to a type of the musical composition and representing a distribution showing appearance probabilities of respective pitch names included in the type of the musical composition, load ratios, each indicating a ratio of the distribution, which is represented by each of the templates stored in the template storing section, to the distribution acquired by the appearance probability acquiring section; and a tonal information detecting section for detecting, as the tonal information, a load ratio set comprised of the load ratios, respectively corresponding to the templates, which are calculated by the load ratio calculating section.
Effect of the Invention
According to the first aspect, instead of selecting the most analogous template from among the templates, the load ratio set comprised of the load ratios respectively corresponding to the templates is detected. Therefore, it becomes possible to recognize the ratio of an appearance probability distribution represented by each of the templates to that of the predetermined musical composition (a musical composition in which the tonal information is to be detected). In other words, instead of determining one type of a musical composition corresponding to one of the templates, “a proportion of each type occurring within the predetermined musical composition” is detected, thereby making it possible to represent a musical tone of the predetermined musical composition by means of the proportion of each type. Thus, in a case where the predetermined musical composition includes two types of keys, for example, the load ratios corresponding to the templates representing the two types of keys are calculated to be larger. That is, according to the first aspect, it becomes possible to accurately detect the tonal information of a musical composition even if the musical composition includes a modulation.
According to the second aspect, the tonal information is detected by using the load ratio set, thereby making it possible to accurately detect the most dominant key, the most dominant tonality, the most dominant tonality occupancy rate, and the most dominant scale.
According to the third aspect, the key represented by the template having the maximum load ratio is detected, thereby making it possible to accurately detect the key of the musical composition.
According to the fourth aspect, a total sum of the load ratios corresponding to the plurality of the templates having the same tonality is calculated, so as to detect a tonality of the plurality of the templates having a larger total sum, thereby making it possible to accurately detect the tonality of the musical composition.
According to the fifth aspect, a total sum of the load ratios corresponding to the plurality of the templates having the same scale is calculated, so as to detect a scale of the plurality of the templates having the largest total sum, thereby making it possible to accurately detect the scale of the musical composition.
According to the sixth aspect, it becomes possible to search for at least one musical composition by using the load ratio set or the information obtained based on the load ratio set (the key, the tonality, the scale and the like). Therefore, a search can be accurately executed by using the tonal information.
According to the seventh aspect, the user can easily search for at least one musical composition associated with the inputted selected musical composition condition.
These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
1 musical tone detecting device
11 scale information inputting section
12 appearance probability calculating section
13 template storing section
14 load ratio calculating section
15 tonal information detecting section
100 computer system
110 arithmetic processing section
120 storage section
130 disc drive device
140 recording medium
2 musical composition searching device
21 musical composition inputting section
22 scale data converting section
23 musical composition data storing section
24 musical composition selecting rule storing section
25 selected musical composition information inputting section
26 search section
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the following descriptions, a “tonality” indicates a “major” or “minor” tonality, and a “tonality occupancy rate” indicates an occupancy rate of the major (or minor) tonality in a musical composition. A “scale” indicates 12 types of combinations in the major or minor tonalities having a same key signature. A “key” indicates 24 types of keys (C; C major, Am; A minor, etc.), each consisting of the tonality and the scale. Each of the key, the tonality, the tonality occupancy rate and the scale is an index indicating a musical tone, and is one of tonal information. Note that information, indicating a set of load ratios (a load ratio set), which is to be described later, is also one of the tonal information. As an example of a musical composition processing device according to the present invention, a musical tone detecting device for detecting the tonal information will be described in a first embodiment. As another example of the musical composition processing device according to the present invention, a musical composition searching device for searching for a musical composition by using the tonal information will be described in a second embodiment.
Firstly, a musical tone detecting device 1 according to the first embodiment of the present invention will be described with reference to
The scale information inputting section 11 is operable to receive an input of scale information of a musical composition from an inside or outside of the musical tone detecting device 1. The scale information of the musical composition to be inputted to the scale information inputting section 11 is data including at least information of a sound pitch (note number) and a sound length (duration).
Note that in the exemplary scale information of the musical composition shown in
As described above, the scale information of the musical composition shown in
The appearance probability calculating section 12 calculates appearance probabilities of pitch names included in the scale information of the musical composition inputted to the scale information inputting section 11 for each of the pitch names.
The template storing section 13 stores 24 types of templates corresponding to 24 types of keys, respectively. The 24 types of templates represent musical types which are different from each other. Furthermore, each of the templates shows an ideal appearance probability distribution of a key corresponding thereto. These templates are previously created and stored in the template storing section 13.
Based on the appearance probability distribution, of the musical composition, which is calculated by the appearance probability calculating section 12 and each of the templates stored in the template storing section 13, the load ratio calculating section 14 calculates the load ratios corresponding to the templates, respectively (see
Based on the 24 types of load ratios calculated by the load ratio calculating section 14, the tonal information detecting section 15 detects tonal information of the musical composition. The tonal information indicates information representing a set of 24 types of load ratios (the load ratio set) or various information calculated based on the load ratio set. Note that the various information indicates information of the key, the tonality occupancy rate, the tonality and the scale, all of which are mentioned above, for example. The tonal information detecting section 15 detects the load ratio set as the tonal information. Then, the tonal information detecting section 15 also detects the key, the tonality occupancy rate, the tonality and the scale, all of which are calculated based on the load ratio set, as the tonal information.
Next, a flow of a process executed by the musical tone detecting device 1 according to the first embodiment will be described with reference to
The scale information inputting section 11 is operable to receive the input of the scale information of the musical composition from the inside or outside of the musical tone detecting device 1 (step S1). For example, scale data indicating the scale information such as SMF (a standard MIDI file) is inputted. Note that the scale data to be inputted may be data into which audio data such as PCM data is converted. In the present embodiment, the scale information as shown in
After step S1, the appearance probability calculating section 12 calculates the appearance probability of each of the pitch names included in the scale information of the musical composition inputted in step S1 (step S2). Note that an appearance probability of the pitch name i is denoted by P(i). The appearance probability P(i) is calculated by dividing a total sum of duration of the pitch name i included in the scale information by a total sum of durations of all the pitch names (i=0 to 11) included in the scale information. A total sum ΣP(i) of the appearance probability of each of the pitch names is represented by the following equation (1).
ΣP(i)=1 (i=0 to 11) (1)
As shown in step S2 mentioned above, in the present embodiment, the appearance probability calculating section 12 calculates the appearance probability distribution of each of the pitch names included in the musical composition. However, in a case where the appearance probability distribution of each of the pitch names included in the musical composition is previously known, i.e., in a case where data representing the appearance probability distribution of each of the pitch names included in the musical composition has already been acquired, the appearance probability calculating section 12 may acquire the data in step S2. In this case, a process of calculating the appearance probability distribution in step S2 can be eliminated.
After step S2, the load ratio calculating section 14 calculates the load ratio corresponding to each of the templates (step S3). The load ratio is calculated by using the appearance probability, of each of the pitch names, which is calculated in step S2 (an actual appearance probability of the musical composition) and the appearance probability, of each of the pitch names, which is represented by each of the 24 types of templates stored in the template storing section 13. Hereinafter, a method of calculating the load ratio will be described in details.
Firstly, it is assumed that an appearance probability distribution of a musical composition, in which the tonal information is to be detected, is represented by using those represented by the 24 types of templates respectively corresponding to the 24 types of keys (j=0 to 23). A load ratio, which indicates a ratio of an appearance probability distribution represented by a template of the key j to that of the musical composition in which the tonal information is to be detected, is denoted by W(j). Also, the appearance probability of the pitch name i included in the template of the key j is denoted by Pt (j, i). In this case, the following equations (2) and (3) are obtained.
ΣW(j)=1 (j=0 to 23) (2)
ΣPt(j, i)=1 (i=0 to 11) (3)
When an appearance probability Pf(i) of the pitch name i included in scale information of the musical composition, in which the tonal information is to be detected, is represented by using the templates (i.e., by using W(j) and Pt(j, i)), the appearance probability Pf(i) is represented by the following equation (4).
Pf(i)=Σ(W(j)*Pt(j, i)) (j=0 to 23) (4)
Therefore, the load ratio W(j) (j=0 to 23) corresponding to each of the templates is calculated so that Pf(i) is equivalent to the actual appearance probability P(i) of the musical composition, which is calculated in step S2, for each of the pitch names (i=0 to 11). That is, W(j) can be obtained so as to satisfy the equations (2) to (4), and to satisfy P(i)=Pf(i) (i=0 to 11). Specifically, in the present embodiment, a sum of the square of a difference (P(i)−Pf(i)) of the appearance probability of each of the pitch names is minimized, thereby obtaining the load ratio W(j) (j=0 to 23) corresponding to each of the templates. More specifically, when a difference of the appearance probability of the pitch name i is denoted by E(i), and a sum of the square of the difference E(i) is denoted by ′E, E(i) and ′E are represented by the following equations (5) and (6), respectively.
E(i)=P(i)−Pf(i) (5)
′E=Σ(E(i))2 (i=0 to 11) (6)
By using the equation (6), the load ratio W(j) (j=0 to 23) corresponding to each of the templates is calculated so as to minimize ′E. Note that the load ratio W(j) (j=0 to 23) corresponding to each of the templates can be calculated by using an Evolutionary Strategy, for example. However, any algorithm may be used to calculate W(j). As described above, in step S3, the load ratio w(j) (j=0 to 23) corresponding to each of the templates is calculated. The load ratio W(j) (j=0 to 23) corresponding to each of the templates is represented by the calculation result as shown in
After step S3, the tonal information detecting section 15 detects the information indicating the set of the load ratios W(j) (j=0 to 23) respectively corresponding to the templates (the load ratio set), which are calculated in step S3, as the tonal information of the musical composition (step S4). Furthermore, in the present embodiment, in step S4, the tonal information detecting section 15 further detects the key, the tonality occupancy rate, the tonality and the scale, as the tonal information of the musical composition. Hereinafter, a method of detecting the key, the tonality occupancy rate, the tonality and the scale will be described.
Firstly, in a case of detecting the key, the tonal information detecting section 15 obtains a key of the key number j corresponding to a template having a maximum value of the load ratio W(j), thereby detecting the key as the most dominant key. In a case of detecting the tonality occupancy rate, the tonal information detecting section 15 detects, as the tonality occupancy rate, the occupancy rates of the major and minor tonalities in the musical composition by using the following method. The occupancy rate of the major tonality and the occupancy rate of the minor tonality are denoted by Rmaj and Rmin, respectively. Furthermore, in
Rmaj=ΣW(j)(j=0 to 11) (7)
Rmin=ΣW(j)(j=12 to 23) (8)
Thus, the tonal information detecting section 15 detects, as the tonality occupancy rate, Rmaj and Rmin calculated by the equations (7) and (8), respectively.
Next, in a case of detecting the tonality, the tonal information detecting section 15 detects the tonality by determining whether the major tonality is dominant, or the minor tonality is dominant. That is, the tonal information detecting section 15 compares Rmaj calculated by the equation (7) with Rmin calculated by the equation (8). When Rmaj is larger than Rmin, the tonal information detecting section 15 detects the major tonality as the tonality. On the other hand, when Rmin is larger than Rmaj, the tonal information detecting section 15 detects the minor tonality as the tonality.
Finally, a method of detecting the scale will be described with reference to
Rs(0)=W(0)+W(12)
Rs(1)=W(1)+W(13)
Rs(2)=W(2)+W(14)
. . .
Rs(11)=W(11)+W(23)
Thus, the tonal information detecting section 15 obtains a scale of the scale number s having a maximum value of the scale occupancy rate Rs(s), thereby detecting the scale as the most dominant scale.
As described above, in the musical tone detecting device 1 according to the present invention, instead of comparing an appearance probability distribution of a musical composition with those represented by templates one by one, a ratio (load ratio), of the appearance probability distribution represented by each of the templates to the appearance probability of the musical composition, is calculated. As a result, it becomes possible to accurately detect the tonal information of the musical composition even if the musical composition is composed in a plurality of types of keys such as a musical composition including a modulation.
Furthermore, by using the load ratio set included in the tonal information of the musical composition, which is detected by the musical tone detecting device 1 according to the present embodiment, a user is allowed to understand a ratio of each of the plurality of types of keys included in the musical composition to all types of the keys included therein. That is, when a load ratio of one key is larger than those of the other keys, the user understands that the musical composition is composed in a single key type. On the other hand, when the load ratios of a great number of keys are similar to each other, the user understands that the musical composition is composed in the great number of key types. Therefore, the user is allowed to understand an image of the musical composition without actually listening to the musical composition. Furthermore, similarly to the load ratio set, by using the key, the tonality occupancy rate, the tonality and the scale, which are all included in the detected tonal information, the user is also allowed to understand the image of the musical composition without actually listening to the musical composition.
In the above descriptions, the template storing section 13 stores only one template representing each of the 24 types of keys. However, a plurality of templates representing each type of keys may be stored. In this case, the templates of different genres of musical compositions such as pops, jazz and classical music, for example, may be prepared for each type of keys, and stored in the template storing section 13. Then, a load ratio corresponding to each of the templates stored in the template storing section 13 is calculated, thereby allowing the musical tone detecting device 1 to accurately detect the tonal information corresponding to a genre of a musical composition. Furthermore, the load ratio corresponding to each of the templates includes genre information, thereby allowing the musical tone detecting device 1 to further detect a genre of the musical composition.
Alternatively, the templates of different musical parts such as melody and bass guitar, for example, may be prepared for each type of keys, and stored in the template storing section 13. Then, among all of the templates stored in the template storing section 13, load ratios corresponding to the templates of an inputted musical part are calculated, thereby allowing the musical tone detecting device 1 to accurately detect the tonal information corresponding to the inputted musical part.
Furthermore, instead of the appearance probability distributions of the 24 types of keys, the appearance probability distributions of different types of scales or chords may be used as the templates. Then, a load ratio, corresponding to each of the templates representing the appearance probability distributions of the different types of scales or chords, is calculated, thereby making it possible to detect the tonal information concerning a scale or chord.
Still furthermore, the scale information inputted to the scale information inputting section 11 includes at least one playing part such as melody or bass guitar. The scale information may include a plurality of playing parts, for example. Also, a playing time of a musical composition consisting of the scale information may be a time period for playing the entirety of the musical composition or a time period for playing a portion of the musical composition. Note that in the time period for playing the portion of the musical composition, a first half portion excluding an introduction may be played, for example. This is because the aforementioned portion of the musical composition is generally composed in a dominant key. As a result, the musical tone detecting device 1 can detect the tonal information with higher accuracy. Furthermore, a processing burden on the musical tone detecting device 1 also can be decreased.
The musical tone detecting device 1 according to the present invention may be realized by causing a general computer system 100 to execute a tonal information detecting program.
In
In the above descriptions, the tonal information detecting program is provided by the recording medium 140. However, the tonal information detecting program may be provided via an electric communication line such as the Internet. Furthermore, hardware may execute the entirety or a portion of a process of detecting the tonal information.
Next, a musical composition searching device 2 according to the second embodiment of the present invention will be described with reference to
The musical composition inputting section 21 determines whether or not musical composition data is inputted from an inside or outside of the musical composition searching device 2 (step S11). As a result of the determination in step S11, when the musical composition data is not inputted, a process of step S15 is executed. On the other hand, as a result of the determination in step S11, when the musical composition data is inputted, a process of step S12 is executed. That is, the musical composition inputting section 21 causes the musical composition data storing section 23 to store the inputted musical composition data (step S12).
In the present embodiment, the musical composition data may be audio data or scale data. The audio data is PCM audio data, or compressed audio data such as MP3 and AAC, for example. The scale data indicates scale information such as SMF (standard MIDI file), for example. Note that the inputted musical composition data includes at least one playing part such as melody or bass guitar. The inputted musical composition data may include a plurality of playing parts, for example. Furthermore, a playing time of the musical composition data may be a time period for playing the entirety of the musical composition data or a time period for playing a portion of the musical composition data.
After step S12, when the musical composition data stored in step S12 is audio data (PCM audio data, for example), the scale data converting section 22 converts the audio data into scale data indicating the scale information (step S13). The scale data converting section 22 converts the audio data into the scale data by using a method disclosed in Japanese Laid-Open Patent Publication No. 58-181090, for example. When the audio data is compressed audio data such as MP3 and AAC, the scale data converting section 22 firstly converts the audio data into PCM audio data, and then converts the PCM audio data into scale data. Note that a method of converting the audio data into the scale data is not limited to that mentioned above. Other methods may be used to convert the audio data into the scale data. Alternatively, when the musical composition data stored in step S12 is scale data such as SMF, the process of steps S1 to S4 is executed without executing a process of step S13 mentioned above.
After step S13, by executing steps S1 to S4 (see
In step S14, the musical composition data storing section 23 stores at least one of the load ratio set, the key, the tonality occupancy rate, the tonality and the scale, which are all included in the tonal information detected in step S4.
After step S14, the search section 26 determines whether or not selected musical composition information is inputted from the selected musical composition information inputting section 25 (step S15). The user operates the selected musical composition information inputting section 25 so as to input the selected musical composition information of a desired musical composition.
As a result of the determination in step S15, when the selected musical composition information is not inputted, the process returns to step S11. On the other hand, as the result of the determination in step S15, when the selected musical composition information is inputted, a process of step S16 is executed.
After step S15, the search section 26 specifies a search condition corresponding to the selected musical composition information inputted (step S16). In the present embodiment, as a method of specifying a search condition corresponding to an inputted piece of selected musical composition information, there is a method of specifying the search condition based on a musical composition selecting rule stored in the musical composition selecting rule storing section 24.
Note that the pieces of selected musical composition information stored in the musical composition selecting rule storing section 24 may be classified in accordance with a level of “happy<->sad”, instead of classifying the pieces of selected musical composition information into five levels of “happy”, “moderately happy”, “neutral”, “moderately sad” and “sad”, for example. In this case, as the selected musical composition information, a level sx of “happy (1.0)<->sad (0.0)” is set, for example. Also, as the search condition, musical composition data, in which a difference between the occupancy rate of the major tonality Rmaj and the level sx is 0.1 or less, is set, for example. The user uses a slider bar as the selected musical composition information inputting section 25, for example, to input a piece of selected musical composition information.
After step S16, based on the search condition specified in step S16, the search section 26 searches for a musical composition from the pieces of musical composition data stored, in step S12, in the musical composition data storing section 23, and displays a title of the musical composition satisfying the search condition (step S17). Note that in step S17, a process of reproducing the displayed title of the musical composition may be further executed.
In the above descriptions, the user inputs the selected musical composition information, thereby specifying the search condition used for searching for a musical composition. In another embodiment, the user may directly input the search condition, and specify the inputted search condition. For example, the user operates the selected musical composition information inputting section 25 so as to input a condition indicating “key is C” or “major tonality” or a compound condition obtained by combining a plurality of such conditions. Then, by using the tonal information stored in the musical composition data storing section 23, the search section 26 searches for a musical composition satisfying the search condition inputted by the user, and displays a title of the musical composition satisfying the search condition. As a result, instead of using the search condition specified in accordance with the musical composition selecting rule which is previously set, the user is allowed to search for a musical composition by inputting the search condition freely.
After step S17, the user selects whether or not to finish the process executed by the musical composition searching device 2 (step S18). In a case where the process is not to be finished, the process returns to step S11. The aforementioned process is executed on each of the plurality of pieces of musical composition data inputted.
As described above, the musical composition searching device 2 according to the present embodiment allows the user to search for a musical composition based on the tonal information of the musical composition.
The musical composition processing device (the musical tone detecting device 1 and the musical composition searching device 2) described in the first and second embodiments may be formed by an integrated circuit. For example, in the first embodiment, the appearance probability calculating section 12, the load ratio calculating section 14, and the tonal information detecting section 15 may be formed by an integrated circuit. In this case, the integrated circuit includes an input terminal for inputting the musical composition and the templates stored in the template storing section 13, and an output terminal for outputting the tonal information detected by the tonal information detecting section 15. Also, in the second embodiment, the appearance probability calculating section 12, the load ratio calculating section 14, the tonal information detecting section 15, the scale data converting section 22, and the search section 26 may be formed by an integrated circuit. In this case, the integrated circuit includes an input terminal for inputting the musical composition, the templates stored in the template storing section 13, the musical composition selecting rule, the selected musical composition information, the musical composition data stored in the musical composition data storing section 23, and the tonal information stored in the musical composition data storing section 23. Furthermore, the integrated circuit also includes an output terminal for outputting the tonal information detected by the tonal information detecting section 15 and a search result obtained by the search section 26. If an integrated circuit includes a storage section, components for storing data or the like (the template storing section 13, for example) may be formed as a portion of the integrated circuit by causing the storage section to store the data, when necessary.
While the invention has been described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is understood that numerous other modifications and variations can be devised without departing from the scope of the invention.
A musical composition processing device according to the present invention is applicable to a musical composition searching device, a jukebox, an audio player, and the like, which perform a search for a musical composition by using detected tonal information.
Number | Date | Country | Kind |
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2004-359151 | Dec 2004 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2005/022303 | 12/5/2005 | WO | 00 | 5/24/2007 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2006/062064 | 6/15/2006 | WO | A |
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20080011148 A1 | Jan 2008 | US |