JP2019032921A - Music reproduction device - Google Patents

Abstract

To provide a music reproduction device that randomly reproduces music without giving discomfort to a user.SOLUTION: A CPU divides, according to sound quality, a plurality of pieces of music data stored in a storage device into three stages of groups: a high resolution group; a CD specification group; and a low sound quality group. The CPU randomly reproduces the sound data so that the groups different from each other by two or more stages are not reproduced in succession.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a music playback device, a music playback method, a music playback program, and a recording medium storing the music playback program.

  2. Description of the Related Art Conventionally, music playback devices that play back music data recorded on a recording medium at random are known (Patent Documents 1 and 2). The conventional music playback device plays back randomly regardless of the sound quality, so if you play a low-quality music immediately after playing a high-quality music, the difference in sound quality will become too large, and the user will feel uncomfortable The problem is an example.

JP 2006-228373 A JP 2008-243253 A

  An example of a problem to be solved by the present invention is to perform random reproduction without giving the user a sense of incongruity.

  In order to solve the above-described problem, the music playback device described in claim 1 includes an acquisition unit that acquires a plurality of music data and a playback unit that randomly plays back the plurality of music data, and the playback The unit performs random reproduction so that the music whose sound quality is more than a predetermined distance is not continuously reproduced.

It is a block diagram which shows one Example of the music reproduction apparatus of this invention. It is explanatory drawing for demonstrating the grouping in 1st Example. It is explanatory drawing for demonstrating the grouping in 2nd Example. It is explanatory drawing for demonstrating the grouping in a modification. It is explanatory drawing for demonstrating the grouping in 3rd Example. It is explanatory drawing for demonstrating the grouping in 4th Example.

  Hereinafter, a music reproducing apparatus according to an embodiment of the present invention will be described. The acquisition unit acquires a plurality of music data. The reproduction unit randomly reproduces the music pieces whose sound quality is more than a predetermined distance so as not to be continuously reproduced.

  Thereby, random reproduction can be performed without giving the user a sense of incongruity.

  Also, a rank information acquisition unit is provided. The rank information acquisition unit acquires rank information in which a plurality of pieces of music data are distributed into n stages (n is an integer of 3 or more) according to sound quality, and is reproduced. The unit may reproduce the music data of groups separated by m stages (m is an integer of 2 or more) or more at random so as not to be reproduced continuously.

  In addition, the playback unit, based on the rank information, ranks from the top to the pth (p is an integer of 1 or more) or / and from the bottom to the qth (q is an integer of 1 or more). May be excluded from the reproduction target. Thereby, m = n−p, m = n−q, or m = n− (p + q) groups of music data separated by more than steps are not continuously reproduced, and there is less discomfort.

  In addition, the performance information acquisition unit may acquire the performance information of the connected output device, and the reproduction unit may change the value of p or the value of q based on the performance information. As a result, the number of groups excluded from the reproduction target can be varied according to the performance of the output device. For example, the performance of the output device is poor and the reproduction target is not narrowed although there is not much difference in sound quality.

  The environment information acquisition unit may acquire the environment information, and the reproduction unit may change the value of p or the value of q based on the environment information. Thereby, the number of groups excluded from the reproduction target can be changed according to the environment information. For example, the reproduction target is not narrowed even though the surrounding environment is bad and the sound quality difference is not so much.

  In addition, rank information is further divided into s stages (s is an integer of 2 or more) based on genre information, musical tone, or BPM information, and the playback unit is the highest on the basis of rank information. To the p-th group (p is an integer greater than or equal to 1) or / and the t-th group from the bottom to the q-th group (q is an integer greater than or equal to 1) Groups with ranks up to (t is an integer of 1 or more) and / or groups with ranks up to the u-th (u is an integer of 1 or more) from the bottom may be excluded from the reproduction target.

  Also, in the music playback method according to an embodiment of the present invention, rank information in which a plurality of pieces of music data acquired by the acquisition unit are distributed into n stages (n is an integer of 3 or more) according to sound quality. And the music data of groups separated by m stages (m is an integer of 2 or more) or more are randomly played back so as not to be played back continuously. Thereby, random reproduction can be performed without giving the user a sense of incongruity.

  Moreover, it is good also as a music reproduction program which performs the music reproduction method mentioned above by computer. Since the program is executed by a computer, dedicated hardware or the like is not necessary, and can be installed and functioned in a general-purpose music player.

  Further, the music reproduction program may be stored in a computer-readable recording medium. In this way, the program can be distributed as a single unit in addition to being incorporated in the device, and version upgrades can be easily performed.

(First embodiment)
Next, the music reproducing device and the music reproducing method in the first embodiment will be described below with reference to FIG. FIG. 1 is a block diagram showing an embodiment of a music reproducing apparatus of the present invention. In this embodiment, an example in which the music playback device 1 is mounted on a vehicle will be described.

  The music reproducing device 1 includes a display unit 2, an operation unit 3, a CPU 4, a storage device 5, a decoder 6, a DA converter 7, an amplifier 8, and a speaker 9. The display unit 2, the operation The unit 3, the CPU 4, the storage device 5, the decoder 6, the DA converter 7, and the amplifier 8 are accommodated in a case or the like (not shown) and are installed on a vehicle instrument panel or the like.

  The display unit 2 is configured by, for example, a liquid crystal display, and outputs and displays the contents (list) of music stored in the storage device 5 and the results processed by the CPU 4 to the user (user).

  The operation unit 3 includes, for example, a button and a knob, and detects an operation input performed by the user and outputs a corresponding operation signal to the CPU 4.

  The CPU 4 operates in accordance with a control program stored in a built-in ROM or the like and controls the entire music reproducing device 1.

  The storage device 5 as a storage unit is composed of a storage medium such as a hard disk drive, an optical disk drive, or a nonvolatile memory. The storage device 5 stores music data to be played back by the music playback device 1 and related information such as genre information related to the music data and BPM (Beats Per Minute) information indicating the tempo of the music.

  The decoder 6 reads the music data from the storage device 5 and decodes it. The DA converter 7 converts the decoded music data into an analog signal and outputs it to the amplifier 8.

  The amplifier 8 amplifies the analog signal of the music data output from the DA converter 7 and outputs it to the speaker 9 connected to the outside. The speaker 9 is provided below the front door in the passenger compartment, behind the rear seat, and the like, and emits an analog signal output from the amplifier 8.

  Next, the operation of the music playback device 1 described above will be described. First, the CPU 4 functions as a rank division unit, and the CPU 4 performs a grouping process in which a plurality of music data stored in the storage device 5 is distributed into three stages (n = 3) groups according to sound quality in response to a predetermined trigger. In the grouping process, the CPU 4 checks the CODEC, sampling frequency, and quantization bit of the music data. As shown in FIG. 2, the high resolution group (high sound quality group), CD spec group (medium sound quality group), low Divide into three groups of sound quality groups.

  As a trigger for the grouping process, for example, grouping every time new music data is stored in the storage device 5 can be considered.

  Further, the CPU 4 functions as a reproduction unit, and performs a random reproduction process of randomly reproducing a plurality of music data stored in the storage device 5 in response to a predetermined trigger. At this time, the CPU 4 functions as an acquisition unit and rank information acquisition unit, acquires music data stored in the storage device 5 and rank information of the music data, and as shown in FIG. The low sound quality group in the stage up to q = 1) is excluded from the reproduction target, and random reproduction is performed from the high-resolution group and the CD spec group surrounded by the one-dot chain line. That is, the CPU 4 performs random reproduction within the high resolution group and the CD spec group, and performs random reproduction.

  Thus, by removing the low sound quality group from the reproduction target, the music data of the low sound quality group is not reproduced next to the music data of the high resolution group. That is, the music data of groups separated by two or more stages (m = 2) or more are not continuously reproduced during random reproduction. Thereby, random reproduction can be performed without giving the user a sense of incongruity.

  If there is no music data belonging to the high resolution group, the CPU 4 may perform random reproduction within all groups without removing the low sound quality group from the reproduction target.

  In the first embodiment described above, the low sound quality group is excluded from the reproduction target, but the present invention is not limited to this. For example, the high-resolution group from the top to the first (p = 1) may be excluded from the reproduction target without removing the low sound quality group from the reproduction target.

  Also in this case, by removing the high resolution group from the reproduction target, the music data of the high resolution group is not reproduced next to the music data of the low sound quality group. That is, the music data of a group separated by two or more stages is not continuously reproduced during random reproduction. In this case, if there is no music data belonging to the low sound quality group, the CPU 4 may perform random reproduction within all groups without removing the high resolution group from the reproduction target.

  Whether the low sound quality group or the high sound quality group is excluded from the reproduction target may be preset for each music playback device 1 or may be selected by the user by operating the operation unit 3.

(Second embodiment)
Next, a music playback device and a music playback method in the second embodiment will be described. Since the configuration of the music reproducing device 1 is the same as that of the first embodiment, detailed description thereof is omitted here. The difference between the first embodiment and the second embodiment is the grouping process. In the first embodiment, the high resolution group, the CD spec group, and the low sound quality group are grouped into three stages, but the present invention is not limited to this.

  In the second embodiment, in the grouping process, the CPU 4 first performs grouping into three stages, a high resolution group, a CD spec group, and a low sound quality group, as in the first embodiment. Further, as shown in FIG. 3, the CPU 4 further divides into two stages (s = 2): a group in which the difference in sound quality such as dance music is difficult to understand, and a group in which the difference in sound quality such as classic is known. And the group where the difference in low sound quality / sound quality is difficult to understand is less discomfort even if it is played next to the music data of the high resolution group. Group.

  For example, genre information given to music data is used as the grouping of the group in which the difference in sound quality is difficult to understand and the group in which the difference in sound quality is known. In other words, for example, genre information is a group in which the difference in sound quality is known, and genre information is in a group in which the difference in sound quality is difficult to understand, such as dance and disco. In this way, it is conceivable that the genre information is divided into two groups in advance and divided into two groups according to the genre information given to the music data. Further, when genre information is not given to music data, it is divided into groups using existing techniques for estimating genre information from music tone analysis and BPM information.

  In the random reproduction process, the CPU 4 ranks from the bottom to the first (u = 1) in the low sound quality group that is the group from the bottom to the first (q = 1). The group that shows the difference in low sound quality / sound quality is removed from the playback target, and random playback is performed from the high resolution group, the CD spec group, and the group in which the difference in low sound quality / sound quality is difficult to understand.

  As described above, by removing a group that shows a difference in low sound quality / sound quality from a playback target, music data in a group that shows a difference in low sound quality / sound quality next to the music data of the high resolution group is not played back. That is, music data of groups separated by three or more levels during random reproduction are not reproduced continuously. Thereby, random reproduction can be performed without giving the user a sense of incongruity. In addition, as compared with the first embodiment, the number of songs excluded from the reproduction target can be reduced, and the reproduction target is not narrowed.

  In the second embodiment described above, the CPU 4 reproduces a group in which the difference in sound quality is further divided into a group in which the difference in sound quality is further understood and a group in which the difference in sound quality is difficult to understand. Although excluded from the subject, it is not limited to this. For example, as shown in FIG. 4, the high-resolution group and the CD spec group may be divided into two stages: a group in which the difference in sound quality is further understood and a group in which the difference in sound quality is difficult to understand.

  Then, in the random playback process, the CPU 4 selects the first group from the top (t = 1) among the high resolution groups that are the first group from the top (p = 1). The group that understands the difference in high resolution / sound quality is removed from the playback target, and random playback is performed from the high resolution / sound quality difference group, CD spec group, and low sound quality group surrounded by the dashed line in FIG. Also good. Alternatively, both high resolution / sound quality difference group and low sound quality / sound quality group may be excluded from the reproduction target.

(Third embodiment)
Next, a music reproducing device and a music reproducing method in the third embodiment will be described. Since the configuration of the music reproducing device 1 is the same as that of the first and second embodiments, detailed description thereof is omitted here. The grouping process in the third embodiment is the same as that in the second embodiment shown in FIG. The ranks of the groups are, from the top, the high resolution group, the CD spec group, the group that understands the difference in low sound quality / sound quality, and the group that makes it difficult to understand the difference in low sound quality / sound quality. The major difference between the second embodiment and the third embodiment is that the range excluded from the reproduction target varies depending on the performance of the speaker 9 (output device).

  Next, the operation of the music reproducing device 1 in the third embodiment will be described. The CPU 4 functions as a performance information acquisition unit and acquires the performance of the speaker. As a method for acquiring the performance, it is conceivable that the user first inputs information related to the performance. The user operates the operation unit 3 to input an upper limit or a lower limit of a frequency that the speaker 9 can reproduce, whether the speaker 9 is a high-resolution compatible device, and a shape of the speaker 9 (such as a stationary speaker, a headphone, or a car speaker). The CPU 4 acquires performance information based on the input performance information.

  Alternatively, it is also conceivable that the user inputs model number information of the speaker 9 and acquires performance information from the server via a network. Further, the CPU 4 may automatically measure and acquire the performance of the speaker 9 using a sound field measurement technique such as an auto equalizer or MCACC. In this embodiment, the performance information is information indicating whether performance is good or bad.

  In the random reproduction process, if the performance information indicates that the performance is good, the CPU 4 removes all the low-quality groups from the bottom to the second as shown in FIG. , Play randomly. On the other hand, if the performance information indicates that the performance is poor, as shown in FIG. 5B, the CPU 4 excludes only the group that shows the difference in the low sound quality / sound quality from the bottom to the first from the reproduction target. Play randomly.

  The sound quality difference varies depending on the performance of the speaker 9. The high performance speaker 9 tends to lead to a sense of discomfort and discomfort due to the difference in sound quality. On the other hand, the speaker 9 with poor performance is less likely to cause discomfort or discomfort even if there is a difference in sound quality. According to the third embodiment, the number of groups excluded from the reproduction target can be changed according to the performance of the speaker 9, and the performance of the speaker 9 is poor and the reproduction target becomes narrow even though there is not much difference in sound quality. Absent.

  According to the third embodiment described above, the number of groups excluded from the reproduction target is changed according to the performance of the speaker 9, but the present invention is not limited to this. The way of feeling the sound quality changes depending not only on the performance of the speaker 9 but also on the viewing environment of the user. For example, in a quiet viewing room, it can easily lead to discomfort and discomfort due to differences in sound quality. On the other hand, in a vehicle with a large traveling noise such as road noise, even if there is a difference in sound quality, it is difficult to cause discomfort and discomfort.

  Therefore, the CPU 4 may function as an environment information acquisition unit, acquire environment information, and vary the number of groups excluded from the reproduction target according to the environment information. More specifically, the environmental information is acquired from the ambient noise level using a sound collection device such as a microphone. In this embodiment, the environmental information is information indicating whether the noise level is high or not.

  In the random reproduction process, if the environmental information indicates that the noise level is high, the CPU 4 performs random reproduction by excluding all low sound quality groups from the reproduction target as shown in FIG. 5A. On the other hand, if the environmental information indicates that the noise level is not high, the CPU 4 removes only a group in which the difference in low sound quality / sound quality is known from the reproduction target as shown in FIG.

(Fourth embodiment)
Next, a music reproducing device and a music reproducing method in the fourth embodiment will be described. Since the configuration of the music reproducing device 1 is the same as that of the first embodiment, detailed description thereof is omitted here. In the first to third embodiments, a specific group is excluded from the reproduction target, but in the fourth embodiment, all groups are subject to reproduction. A significant difference between the fourth embodiment and the first to third embodiments is a random reproduction process. In the random reproduction process, the CPU 4 performs random reproduction by removing a group that is separated from the group of music data currently being reproduced by m stages or more from a reproduction target to be reproduced next.

  Next, as shown in FIG. 6, the details of the random reproduction process in the case of being divided into a high resolution group, a CD spec group, and a low sound quality group will be described. First, when a random reproduction operation is performed by the user, first, the CPU 4 performs random random lottery within all groups and performs random reproduction. Thereafter, the CPU 4 performs random lottery so that the music data of a group separated by two or more stages (m = 2) or more from the music data group currently being reproduced is not reproduced next time.

  For example, if the group of music data currently being played is a high-resolution group, the CPU 4 performs random number lottery within the high-resolution group and the CD spec group excluding the low-quality group at the lower level as shown in FIG. Next, the music to be played back is determined. If the music data group currently being played is a CD spec, the CPU 4 does not have a group separated by two or more stages as shown in FIG. 6B. Determine the music to play. If the music data group currently being played back is a low sound quality group, the CPU 4 determines a random number within the CD spec group and the low sound quality group, excluding the two-stage high resolution group, as shown in FIG. A lottery is performed and the music to be played next is determined.

  According to the above-described embodiment, the CPU 4 randomly reproduces the music data of a group that is separated from the group of the music data currently being reproduced by two or more stages so as not to be reproduced next. Thereby, it is possible to randomly reproduce the music data of the groups separated by two or more stages without continuously narrowing the reproduction target.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 music playback device 4 CPU (acquisition unit, rank information acquisition unit, playback unit, performance information acquisition unit, environment information acquisition unit)
5 storage devices

Claims (1)

An acquisition unit for acquiring a plurality of song data;
A playback unit that randomly plays back the plurality of music data,
The playback unit performs random playback so that music whose sound quality is more than a predetermined distance is not continuously played back.

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