JP2011149993A - Replay order determination device, replay order determination method and replay order determination program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a replay order determination device, a replay order determination method and a replay order determination program capable of reducing a sense of incongruity without generating an abrupt change when a musical piece is replayed according to a request. <P>SOLUTION: The replay order determination device 100 for determining a replay order of a series of musical pieces includes: a replay order managing unit 103 for managing a replay order of musical pieces to be replayed as a replay list by musical piece group; a request receiving unit 102 for receiving a request from a user; a musical piece extracting unit 104 for extracting the musical piece group according to the request; a replay order determination unit 105 for determining a replay order of the musical pieces according to a desired object function in the extracted musical piece group while referring to a musical piece replayed immediately before the extracted musical piece groups when the extracted musical piece group is inserted into a replay list. Thereby, when the musical piece is replayed according to the request, the sense of incongruity is reduced without generating the abrupt change. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a playback order determination apparatus, a playback order determination method, and a playback order determination program for determining a playback order of a series of music pieces.

  In recent years, so-called Internet radio distribution services have become widespread. For example, the music distribution system described in Patent Document 1 enables easy and immediate purchase processing of music being distributed without knowing information related to music in an Internet radio terminal. The karaoke apparatus described in Patent Document 2 provides a system that receives content from an Internet radio station and plays it as BGM between karaoke performances. The telephone set described in Patent Document 3 realizes a telephone functioning as an Internet radio receiver, and makes Internet radio content available as BGM on the telephone.

  On the other hand, a technique for automatically remixing music is known. The synchronized playback device described in Patent Document 4 realizes an automatic DJ mix by automatically synchronizing the music tempo and connecting beats. In the automatic DJ mix, the reproduction order determination device described in Patent Document 5 determines the order of the reproduction target musical composition group by obtaining the musical composition order that minimizes the signal expansion / contraction amount.

With respect to such a signal expansion / contraction amount, Non-Patent Documents 1 and 2 express the degree of signal expansion / contraction by the following expression.

Here, fopt (x, y) is a coefficient for matching the tempos of the music pieces x and y. For example, if the tempo of music x is BPMx and the tempo of music y is BPMy, the coefficient fopt_y for matching the tempo of music y to x is
fopt_y (x, y) = BPMx / BPMy (2)
Can be expressed as

In Non-Patent Document 3, the degree of uncomfortable feeling of the listener is expressed by the following expression.
Variables a and b are constants expressing the listener's uncomfortable value.

Non-Patent Document 3 also realizes a method of adjusting the tempo of both music pieces. For example, the tempo adjustment coefficients f_optM and foptO of the music pieces M and O can be expressed as follows.
f_optM = T_aim / BPMM, foptO = T_aim / BPMO (4)
Here, T_aim is the target tempo, BPMM is the tempo of song M, and BPMO is the tempo of song O.

  In Non-Patent Document 4, an acoustic feature is extracted from a music signal, and a musical piece is searched using the acoustic feature of the query musical piece and the vector similarity of the acoustic feature of the search target musical piece. In addition, music search based on user preferences is realized using conformity feedback.

JP 2005-106926 A JP-A-2005-55628 JP 2004-194057 A JP 2009-204907 A JP 2009-205751 A

Hiromi Ishibe, Keiichiro Hoashishi, Yasuhiro Takishima, “Music Automatic Remix Method Considering Sound Quality Degradation”, Research Entertainment Entertainment Computing (EC), March 2008, Vol.2008, No.26 Hiromi Ishibe, Keiichiro Hoashi, Yasuhiro Takishima, “Method of determining music order using signal expansion / contraction ratio in automatic DJ mix playback”, IPSJ 71st National Convention, Proceedings Vol. 2, pp.41-42 . H. Ishizaki, K. Hoashi, Y. Takishima, Full-automatic DJ Mixing System with Optimal Tempo Adjustment Based on Measurement Function of User Discomfort, proceedings of ISMIR2009, pp.135-140. Hoashi, K, Matsumoto, K, Inoue, N, Personalization of user profiles for content-based Music Retrieval based on Relevance feedback, Proc. Of ACM Multimedia 2003, 2003, pp.110-119

  The Internet radio distribution as described above is characterized in that it has communication bidirectionality compared to conventional radio broadcasting and can be requested. However, when distributing an automatic DJ mix as BGM, the Internet radio distribution described in Patent Literatures 1 to 3 cannot provide a natural BGM. For example, when DJ mixing is automatically performed in response to a request, reproduction is not started in the order corresponding to the requested music and the reproduction music list. Therefore, a sudden melody change occurs at the turn of the music, giving the listener a sense of incongruity.

  The present invention has been made in view of such circumstances, and a reproduction order determination device and a reproduction order determination that can easily adjust the music order according to the purpose when the music is reproduced in response to a request. It is an object to provide a method and a playback order determination program.

  (1) In order to achieve the above object, the playback order determination device of the present invention is a playback order determination device that determines the playback order of a series of music pieces, and uses the playback order of the played back music as a playback list. A playback order management unit that manages each request, a request reception unit that receives a request from a user, a music extraction unit that extracts a music group in response to the request, and the insertion of the extracted music group into the playlist A playback order determining unit that determines a playback order of music according to a desired objective function in the extracted music group while referring to the music played immediately before the extracted music group. It is characterized by. Thereby, when music is reproduced in response to a request, it is possible to easily adjust the music order according to the purpose. For example, it is possible to reduce the uncomfortable feeling of the user who has listened to the music without causing a sudden change.

  (2) Further, in the playback order determination device of the present invention, when the playback order determination unit is playing back music based on the playback list, The extracted music group is inserted. As a result, it is possible to insert music according to the request at an appropriate position even during reproduction.

  (3) Further, the playback order determination device of the present invention is characterized in that the music extraction unit extracts music groups having similar music tones based on the feature amount determined by the request. Thereby, the music tone can be gradually changed by using the music reproduced before and after the requested music, or by using a part of the music in the requested music group.

  (4) Further, in the playback order determination device of the present invention, the music extraction unit is configured to play a music group that is scheduled to be played either before or after the feature amount determined by the request and the order in which the extracted music group is inserted. Based on the feature amount, a music group is extracted. Thereby, since the similar music can be inserted in consideration of the characteristics of the music group reproduced in the order before and after the requested music group is inserted, the tune can be gradually changed.

  (5) Further, in the playback order determination device of the present invention, the playback order determination unit determines the order of the songs in the added music group to the order with the smallest required tempo adjustment amount. It is a feature. Thereby, a sense of incongruity about the continuity of the music within the music group can be reduced.

  (6) The reproduction order determination device of the present invention further includes a distribution unit that distributes music data via the network in the determined reproduction order, and the request reception unit is connected to the user terminal via the network. The distribution unit distributes music data to the user terminal that has received the request. Accordingly, it is possible to provide a continuous music distribution service so as not to cause a sense of incongruity in response to a request.

  (7) The playback order determination method of the present invention is a playback order determination method for determining the playback order of a series of music pieces, the step of managing the playback order of the music pieces to be played back for each music group, and the user A step of accepting a request, a step of extracting a music group in response to the request, and inserting the extracted music group in the order after the currently playing music group and being played immediately before the extracted music group. Determining the playback order of the music according to the desired objective function in the extracted music group while referring to the music to be recorded. Thereby, when music is reproduced in response to a request, it is possible to easily adjust the music order according to the purpose. For example, it is possible to reduce the uncomfortable feeling of the user who has listened to the music without causing a sudden change.

  (8) The playback order determination program of the present invention is a playback order determination program for determining the playback order of a series of music pieces, a process for managing the playback order of the music pieces to be played back for each music group, and from the user A process of accepting a request, a process of extracting a music group in response to the request, and inserting the extracted music group in the order after the music group currently being played back, and played immediately before the extracted music group The computer is caused to execute a process of determining the reproduction order of the music according to a desired objective function in the extracted music group while referring to the music to be recorded. Thereby, when music is reproduced in response to a request, it is possible to easily adjust the music order according to the purpose. For example, it is possible to reduce the uncomfortable feeling of the user who has listened to the music without causing a sudden change.

  ADVANTAGE OF THE INVENTION According to this invention, when a music is reproduced | regenerated according to a request, it can make it easy to adjust a music order according to the objective.

It is a block diagram which shows the structure of the reproduction | regeneration order determination apparatus which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the reproduction | regeneration order determination apparatus concerning 1st Embodiment. It is a flowchart which shows the operation | movement of the insertion music determination in 1st Embodiment. It is a conceptual diagram which shows an example of a feature synthesis | combination. It is a flowchart which shows the operation | movement of order optimization in 1st Embodiment. It is a figure which shows the management table of the reproduction | regeneration order of a music. It is a figure which shows the management table of the reproduction | regeneration order of a music. It is a figure which shows the management table of the reproduction | regeneration order of a music. It is a block diagram which shows the structure of the reproduction | regeneration order determination apparatus concerning 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In order to facilitate understanding of the description, the same reference numerals are given to the same components in the respective drawings, and duplicate descriptions are omitted.

[First Embodiment]
(Configuration of playback order determination device)
FIG. 1 is a block diagram illustrating a configuration of the playback order determination apparatus 100. The playback order determination apparatus 100 includes a music database 101, a request reception unit 102, a playback order management unit 103, a music extraction unit 104, a playback order determination unit 105, and a playback unit 106, and determines the playback order of a series of music. As shown in FIG. 1, the playback order determination device 100 is a device that can change the order of music pieces without using a network. The case of using the network will be described later. The reproduction order determination device 100 is, for example, a PC, a mobile phone, or a portable music player.

  The music database 101 stores music information to be reproduced, meta information such as BPM, genre, title, artist, and the like, and acoustic features extracted in advance. Acoustic features include those that can be extracted with existing technology and those that are manually applied. For example, tone color, tempo, beat time, etc. are given in advance. Moreover, the feature vector for music extraction may be hold | maintained previously. A feature vector is a multi-dimensional quantification of features. In addition, based on an identifier such as a questionnaire or SVM, information to be used can be given in advance. Information to be used includes non-music feature information such as jogging and driving.

The request receiving unit 102 receives a request from the user. At this time, it is possible to input not only the music but also the imaged situation and genre. The reproduction order management unit 103 manages the reproduction order of the reproduced music as a reproduction list for each music group. For example, it can be divided and managed by the number of songs. Also, the playback order management unit 103 passes the playback target music to the playback unit 106 based on the obtained insertion start position and playback target music order. The music group G ₂ next to the music group G ₁ being played at the requested timing is extracted and used in the subsequent processing. The reproduction list refers to a list in which music to be reproduced is associated with the reproduction order.

  The music extraction unit 104 extracts a music group according to the request. The music extraction unit 104 can extract a music group having a similar music tone based on the feature amount determined by the request. For example, the music to be played can be extracted based on the query feature amount obtained from the playback order management unit 103. The music may be extracted based on vector similarity such as cosine distance, or when non-music feature information such as the imaged situation or genre is requested, the music holding the corresponding information is extracted from the music database. May be. In addition, the music extraction unit 104 can extract a music group based on the feature amount determined by the request and the feature amount of the music group scheduled to be played before and after the order in which the extracted music group is inserted.

When inserting the extracted music group into the playlist, the playback order determining unit 105 refers to the music played immediately before the extracted music group, and sets the desired objective function in the extracted music group. The playback order of the corresponding music is determined. Insert the extracted music group in the order after the currently playing music group and refer to the music played immediately before the extracted music group, according to the desired objective function in the extracted music group Determine the playback order of songs. The desired objective function may be, for example, a function whose purpose is to adjust the order of the songs so that they can be heard naturally, or the purpose of intentionally increasing the gap between songs in the song at the joint portion by inserting songs The function may be Examples of the desired objective function include a tempo adjustment coefficient and a tempo adjustment degree score which will be described later. The reproduction order determination unit 105 determines which musical composition the requested musical composition is reproduced from. For example, it is determined to be inserted immediately after the next music group G _{s + 1} of the music group Gs reproduced at the time when the request is generated or immediately after the next music group G _{s + 2} . When the music is being played back based on the play list, the play order determination unit 105 inserts the music group extracted in the order after the currently playing music group in the play list.

  Also, the playback order determination unit 105 calculates a query feature value from the feature value of the requested song and the acoustic feature value of the song group belonging to the song group Ns + 1. For example, an average value of acoustic feature values or a total feature value of each element of a feature vector can be used. When non-music feature information such as an imaged situation or genre is requested, one or a plurality of songs of the corresponding non-music feature information are randomly extracted from the music database, and the requested music is extracted based on the corresponding music feature amount. The feature value FR can be calculated.

  The playback order determination unit 105 determines the order of the songs in the added music group to the order with the smallest required tempo adjustment amount. The last music piece M0 of the music group belonging to the music group Gs is fixed at the head, and the order in which the music can be reproduced most smoothly from the requested music and the music group obtained by the music extraction unit 104 is determined and reproduced. It is passed to the order management unit 103. Details of the order determination will be described later. The music obtained by the music extraction unit 104 can be narrowed down to the top N music based on the similarity. In this case, the order can be calculated sequentially using N as a unit of order calculation, and information can be passed to the reproduction order management unit 103. When the input is non-music feature information, the order can be calculated for the reproduced music A and the music obtained by the music extraction unit 104. The playback unit 106 applies the DJ mix process to the playback target music obtained by the playback order management unit 103 to play back the music.

(Operation of playback order determination device)
FIG. 2 is a flowchart showing the operation of the playback order determination apparatus 100. As shown in FIG. 2, first, the playback order determination device 100 receives a request for features such as music or genre from a user. Specifically, a music file and meta information held in advance can be designated (step S1). Next, the music group Gx immediately before the order in which the requested music is inserted is extracted (step S2). Then, it is determined whether a search is necessary (step S3). The search indicates that the music is specified by the determination of the playback order determination device 100 regardless of the user's designation.

  If no search is required, the process proceeds to step S5. If the search is necessary, the process of determining the inserted music described later is performed (step S4). Next, a music group to be subjected to order optimization is determined (step S5), and the order of the music group is determined (step S6).

  Next, the music order in each inserted music group is optimized (step S7). At this time, the optimum order is calculated under the condition that the last song of the immediately preceding music group is fixed. When the music order is optimized, DJ mix processing is performed in the obtained order (step S8), the sound source of the music is reproduced (step S9), and the operation is terminated.

(Insert song decision operation)
FIG. 3 is a flowchart showing the operation of determining the inserted music piece by the reproduction order determining device. First, a query feature amount is extracted based on the requested music and the request information (step T1). The query feature amount is calculated based on the feature vector of the music stored in the music database. For example, the query feature amount is calculated from the feature amount of the requested song and the acoustic feature amount of the song group belonging to the song group Gx. As such a feature amount, an average value of acoustic feature amounts, a total feature amount of each element of a feature vector, or the like can be used.

  When non-music feature information such as an imaged situation or genre is requested, one or a plurality of songs of the corresponding non-music feature information are randomly extracted from the music database, and the requested music is extracted based on the corresponding music feature amount. Feature quantities can be calculated. It is also possible to calculate the similarity in advance and to automate the feature synthesis determination based on the threshold value.

  After extracting the query feature amount, it is next determined whether or not a relaxed music group is to be inserted (step T2). The determination is made according to the presence / absence of the setting for inserting the relaxed music group H. When the relaxation music group is not inserted, the process proceeds to step T6.

  On the other hand, when inserting the relaxed music group H, the feature amount of the music group Gx immediately before the insertion position is extracted (step T3). Then, the request and the feature amount of the music group Gx are synthesized (step T4). For example, music can be extracted from a database based on vector similarity such as cosine distance. And the relaxation music group H is specified and the music data are extracted (step T5). Finally, the requested music group R is extracted and the process of determining the inserted music is terminated (step T6).

At this time, music is extracted from the music database 101 based on the feature amount obtained by the query feature extraction process. When non-music feature information such as a situation to be imaged or a genre is requested, a song holding the corresponding information can be extracted from the song database 101. The number of extracted songs can be set arbitrarily. The extracted music group is expressed as R = {R ₁ , R ₂ ,... Rq} (q is an extracted music ID).

(Feature synthesis)
Next, the feature synthesis will be described. It is possible to extract music by reflecting the melody in the playback order by feature synthesis and combining the acoustic feature quantity of the music group belonging to the music group Gx played immediately before the insertion order and the feature quantity of the requested music. it can. FIG. 4 is a conceptual diagram illustrating an example of feature synthesis. FIG. 4 shows a simplified procedure for obtaining the feature amount of the inserted music piece in a two-dimensional space.

  When a set of feature values obtained from a request is represented by a circle FR, and a set of feature values of a music group FGx that is played immediately before the order in which the requested music is inserted is represented by a circle FGx, the circle FR and the circle FGx are exactly the same. A circle FH obtained as an intermediate value represents a set of feature quantities of a music group to be inserted. Then, the inserted music group H can be extracted from the feature amount represented by the circle FH. As described above, the feature amount of music can be expressed by a multidimensional vector, and music can be extracted from the database based on vector similarity such as cosine distance.

(Order optimization behavior)
The order that can be reproduced most smoothly from the requested music and the music group obtained by the music extraction unit 104 is determined. FIG. 5 is a flowchart showing the order optimization operation of the playback order determination apparatus 100.

  First, as shown in FIG. 5, a tempo adjustment coefficient between any two songs in the target music group is calculated (step P1). Then, an adjustment amount to the target value of each song is calculated (step P2). These are repeated until the above calculation is completed for all combinations of two songs (step P3).

  When the calculation of all combinations is completed, the sum of adjustment amounts is calculated for any music order of the target music group (step P4). Then, an adjustment amount between the last music piece and the first music piece in the immediately preceding music group is calculated (step P5), and a total sum of the adjustment amounts is calculated (step P6). Then, the above calculation is repeated until the calculation is completed for all orders (step P7). Then, the order with the smallest total adjustment amount is selected (step P8), and the process is terminated.

(Specific method of order optimization)
Specifically, the order optimization operation can be performed by the following calculation. The playback order determination unit 105 sequentially calculates the order using the music group M as a unit of order calculation, and passes the information to the playback order management unit 103. The last song of the music group Mm is processed under the condition of fixing it as the first music of the music group Mm + 1, and the permutation consistency is maintained.

The music group Mm + 1 can be expressed as L = {L ₁ , L ₂ ,..., L _s } (s is the number of music belonging to the music group Mm + 1) for the last music M0 of the music group Mm. it can. Then, when adjusting the music Lx, the tempo adjustment coefficient with the music Ly is calculated as fopt (x, y), and fopt (x, y) can be calculated by using Equation (2).

Next, a playlist group that can be created from the music group L is represented as P = {P ₁ , P ₂ ,..., P _N } (N is the number of permutations), and each playlist is represented by Pz = {m ₁ , m ₂ , ..., m _n } (where m is a song), V (m _i , m _{i + 1} ) V (m _{i + 1} , m _i ) (i = 1, 2, ..., n-1) A playlist Pz having a minimum tempo adjustment score is obtained by considering the tempo adjustment degree score Score (Pz) in the playlist Pz, with Vs (i) having a small value of Vs (i). Here, V can be calculated by using equations (1) and (3).

Next, if the first song in the playlist Pz that holds Score (Pz) is expressed as Pz1, V (Pz1, M0) and V (M0, Pz1) in M0 and Pz1 (z = 1, ..., N) are calculated. The smaller value is obtained as Vs (M0). Finally, Pz that minimizes Equation (6) is output.
Score '(Pz1, M0) = score (Pz) + Vs (M0) (6)
Here, V need not be limited to the expressions (1) and (3), but may be an evaluation function.

Further, even when the tempo adjustment is performed for both music pieces, it can be dealt with by applying the method. An example of a music order determination method when adjusting the tempo for both music pieces will be described below.
L = {L1, L2, ..., Ls} (s is the sum of the number of songs n and q belonging to the song group Mm + 1) for the last song M0 and the song group Mm + 1 of the song group Mm The tempo adjustment coefficients of the music Lx and the music Ly can be calculated by using Equation (4) as foptx and fopty, respectively. The tempo adjustment amounts vx (x, y) and vy (x, y) and the total tempo adjustment amounts V (x, y) of each music can be calculated by the following equations.

Next, a playlist group that can be created from the music group L is expressed as P = {P ₁ , P ₂ ,..., P _N } (N is the number of permutations), and each playlist is expressed as Pz = {m ₁ , m ₂ , ..., m _n } (where m is a song) V (m _i , m _{i + 1} ) (i = 1,2, ..., n-1) is Vs (i) Considering the tempo adjustment degree score Score (Pz) in the list, a playlist Pz having a minimum tempo adjustment score is obtained.

  Next, if the first song of the playlist Pz holding Score (Pz) is expressed as Pz1, Vx (Pz1, M0) and Vy (M0, Pz1) in M0 and Pz1 (z = 1, ..., N) are calculated. And Vs (M0) = Vx + Vy is calculated. Finally, Pz that minimizes Equation (6) is output.

  In this way, when adjusting the tempo of both the preceding and following music pieces, a playlist that minimizes the degree of sound quality degradation and listener discomfort can be automatically generated. Then, the requested music group can be inserted at a position where the uncomfortable feeling can be further reduced with respect to the currently playing music group. Also, the processing order may be to calculate all the numerical values in advance and calculate all the values, or may calculate each numerical value.

(Example)
Next, an example in which a specifically requested music group is inserted will be described as an example. 6A, 6B, and 6C are diagrams illustrating a management table of the reproduction order of music pieces. Initially, as shown in FIG. 6A, the music song 1～Song 8, music song 1, song music group G ₁ consisting of 2, the music song 3～Song 5 in composed music groups G _2, music song The playback order is managed by dividing into a music group G ₃ composed of 6 to song 8. The song song 1 is played, and the other songs song 2 to song 8 are reserved for playback. A scene in which songs R _{1 to} R ₅ are inserted according to a user request in such a schedule will be described. In such a case, the following processing is performed.

First, an average value of feature quantities is calculated from the request. Then, the order in which the requested music group is inserted is determined. For example, based on the setting, it is inserted between the music group G ₂ next to the music group G ₁ being reproduced and the music group G ₃ next to it. Then, an average value of the characteristic amount for the music group G ₂ to be reproduced immediately before the order of the requested musical composition is inserted.

An intermediate value between the average value of the feature values from the request and the average value of the feature values of the music piece G ₂ is obtained, and the feature value of the inserted music group H ₁ is calculated based on the intermediate value, and the inserted music group H that matches the feature value is calculated. Song A and song B are extracted as ₁ . Then, for the music group G ₃ played immediately after the insertion order, the average value of the feature values is obtained, and it is assumed that the music songs R _{1 to} song R ₅ belonging to the music group R based on the request are close to this song R ₄ and song R ₅ are identified and arranged in the rear order in the song group R. Then, for the music groups H ₁ , R ₁ and R ₂ , the order of the music is optimized in the music group. In this way, as shown in FIG. 6B, when the music is played back according to the music group R based on the request, the music group H ₁ and R ₂ are used for the tone and the optimization within the music group is performed for the tempo. Uncomfortable feeling can be reduced without causing a significant change. Note that it is possible to dare to increase the gap between music pieces by selecting the objective function at the time of optimization, and to easily adjust the music order according to the purpose.

Further, in the above example, are inserted insertion music groups H ₁ before only to music groups R based on the request, may be inserted in the back of the order. In that case, the inserted music group H ₁ is inserted before the music group R based on the request as described above, and as shown in FIG. 6C, the average value of the feature values from the request and the feature value of the music G ₃ An intermediate value with the average value of is obtained. Then, it calculates the feature amount of insertion music groups H ₂ on the basis thereof, song C, to extract the song D as the insertion music groups H ₂ that matches the characteristic amount, inserted in the order behind the music groups R based on the request to insert a music group H _2. It is also possible to insert the insertion music groups H ₂ only after the music groups R based on the request.

[Second Embodiment]
In the above embodiment, a network is not used, but a network may be used. FIG. 7 is a block diagram showing a configuration of the playback order determination apparatus 200. The playback order determination device 200 is configured in the same manner as the playback order determination device 100, but includes a distribution unit 206 instead of the playback unit 106.

  The request receiving unit 102 receives a request from the terminal 300 via the network. On the other hand, the distribution unit 206 distributes the music data to the terminal 300 via the network in the reproduction order determined according to the request. The terminal 300 plays the distributed music file. In this way, for example, streaming playback in the playback order according to the request can be performed.

DESCRIPTION OF SYMBOLS 100 Playback order determination apparatus 101 Music database 102 Request reception part 103 Playback order management part 104 Music extraction part 105 Playback order determination part 106 Playback part 200 Playback order determination apparatus 206 Distribution part 300 Terminal

Claims (8)

A playback order determination device that determines the playback order of a series of music pieces,
A playback order management unit that manages the playback order of songs to be played back as a playlist for each song group;
A request reception unit that receives requests from users;
A music extraction unit that extracts a music group according to the request;
When inserting the extracted music group into the playlist, the music corresponding to the desired objective function in the extracted music group while referring to the music played immediately before the extracted music group A playback order determination unit for determining the playback order of the playback order.   The reproduction order determination unit inserts the extracted music group in the order after the music group currently being reproduced in the reproduction list when the music is being reproduced based on the reproduction list. The reproduction order determination apparatus according to claim 1.   The reproduction order determination apparatus according to claim 1 or 2, wherein the music extraction unit extracts music groups having similar music tones based on a feature amount determined by the request.   The music extraction unit extracts a music group based on a feature quantity determined by the request and a feature quantity of a music group scheduled to be played back either before or after the order in which the extracted music group is inserted. The reproduction order determination apparatus according to any one of claims 1 to 3, wherein the reproduction order determination apparatus is characterized.   The said reproduction | regeneration order determination part determines the order of the music in the said added music group to the order with the smallest tempo adjustment amount required. The reproduction order determination device described. A distribution unit that distributes music data via a network in the determined reproduction order;
The request accepting unit accepts a request from a user terminal via a network,
The reproduction order determining apparatus according to claim 1, wherein the distribution unit distributes music data to a user terminal that has received the request. A playback order determination method for determining a playback order of a series of songs,
Managing the playback order of the music to be played for each music group;
Receiving a request from the user;
Extracting a group of music according to the request;
Inserting the extracted music group in the order after the currently playing music group, and referring to the music played immediately before the extracted music group, a desired objective function in the extracted music group And a step of determining the reproduction order of the music according to the method. A playback order determination program for determining the playback order of a series of songs,
A process for managing the playback order of the music to be played for each music group;
Processing to accept requests from users;
A process of extracting a music group according to the request;
Inserting the extracted music group in the order after the currently playing music group, and referring to the music played immediately before the extracted music group, a desired objective function in the extracted music group And a program for determining the reproduction order of the music according to the program.