JP6440565B2 - Music playback apparatus and music playback method - Google Patents

Description

  The present invention relates to a music playback device and a music playback method for playing back music data that can be acquired from a music data source.

  2. Description of the Related Art In recent years, music playback apparatuses that display not only music data but also attributes of the music data (for example, music data song name, artist name, type of music data source from which the music data is supplied) are known. Yes.

  For example, the music playback device disclosed in Patent Document 1 is configured to create a list relating to a song name, an artist name, and the like based on song information indicating an attribute of music data, and display the list. In addition, the music playback device disclosed in Patent Literature 1 uses a sequence of music data sources arranged in the order of sound quality when the same plurality of music data can be acquired from a plurality of music data sources. Music data from the data source can be played.

JP 2007-042169 A

  However, although the sound quality of the music data source may fluctuate in actual operation, the order of the above-described music data source is fixed in the technique of Patent Document 1. For this reason, there was a problem that it was not possible to cope with fluctuations in sound quality.

  Accordingly, the present invention has been made in view of the above-described problems, and provides a technique that can cope with, for example, a change in sound quality of an attribute such as a music data source. With the goal.

A music playback device according to a first aspect of the present invention is a music playback device that plays back music data that can be acquired from a music data source, acquires metadata indicating an attribute of the music data, and evaluates the sound quality of the attribute. When it is determined that it is possible to acquire a plurality of music data having the same music title and artist name based on the metadata, the acquisition unit that acquires the evaluation data indicating as needed, and the metadata of the plurality of music data , And a control unit that selects music data to be reproduced based on the evaluation data. The plurality of music data sources include a wired music data source from which music data is acquired via a wire, and a wireless music data source from which music data is acquired via a radio. The music data of the wired music data source is selected in preference to the music data, and the music data to be reproduced is selected from the selected music data based on the evaluation data.

A music playback method according to a second aspect of the present invention is a music playback method for playing back music data that can be acquired from a music data source, acquiring metadata indicating an attribute of the music data and evaluating the sound quality of the attribute. If it is determined that it is possible to acquire a plurality of music data having the same music title and artist name based on the metadata, the metadata of the plurality of music data , the evaluation data, The music data to be reproduced is selected based on the above. The plurality of music data sources includes a wired music data source from which music data is acquired via a wire and a wireless music data source from which music data is acquired via a radio, and has priority over the music data of the wireless music data source Then, the music data of the wired music data source is selected, and the music data to be reproduced is selected from the selected music data based on the evaluation data.

  According to the present invention, when the sound quality of an attribute changes, the change can be dealt with.

2 is a block diagram showing a hardware configuration of a music playback device according to Embodiment 1. FIG. 1 is a block diagram showing a functional configuration of a music playback device according to Embodiment 1. FIG. 6 is a block diagram illustrating a functional configuration of a music playback device according to Embodiment 2. FIG. It is a figure which shows the order of the wired music data source which concerns on Embodiment 2. FIG. 10 is a diagram illustrating the order of compression formats according to Embodiment 2. FIG. It is a figure which shows the order of the radio | wireless music data source which concerns on Embodiment 2. FIG. 6 is a flowchart showing the operation of the music playback device according to the second embodiment. It is a figure which shows the order of the bit rate which concerns on the modification 1. FIG. It is a block diagram which shows the structure of the server which concerns on another modification. It is a block diagram which shows the structure of the communication terminal which concerns on another modification.

<Embodiment 1>
Hereinafter, a music playback device according to Embodiment 1 of the present invention will be described. Note that this music playback device is applied to a navigation device (or navigation system) or the like as will be described later.

  FIG. 1 is a block diagram showing a hardware configuration of the music playback device 1 according to the first embodiment. The music playback device 1 in FIG. 1 includes a receiving device 91, a processor 92 including a CPU (Central Processing Unit), and a memory 93. The receiving device 91 includes, for example, a communication device and its peripheral devices (for example, an interface device connected thereto). The memory 93 includes, for example, at least one of an HDD (Hard Disk Drive), a DVD (Digital Versatile Disc) and its drive device, and a semiconductor memory.

  The music playback device 1 is connected to a separate display device (for example, a display) and a separate sound output device (for example, a speaker), and can control these devices.

  FIG. 2 is a block diagram showing a functional configuration of the music playback device 1 according to the first embodiment. The music playback device 1 in FIG. 2 includes an acquisition unit 11 and a control unit 12 that comprehensively controls each component of the music playback device 1.

  The music playback device 1 is configured to play back music data that can be acquired from a music data source. Here, the music data source is a supplier of music data. Such a music data source includes, for example, at least one of a storage medium storing music data that can be accessed by the acquisition unit 11 and a wireless signal on which music data can be received that can be received by the acquisition unit 11. One applies.

  Next, each component of the music playback device 1 will be described.

  The acquisition unit 11 corresponds to the reception device 91 in FIG. The acquisition unit 11 acquires metadata (browsing data) indicating attributes of the music data regarding the music data that can be acquired from the music data source. Note that the music data attributes include, for example, a song name, an artist name, a type of music data source, and a compression format.

  In addition, the acquisition unit 11 acquires not only metadata but also evaluation data indicating evaluation on the sound quality of the attribute as needed. For example, the evaluation of evaluation data includes evaluation of sound quality of a music data source, evaluation of sound quality of a compression format, and the like.

  The control unit 12 implements the function of a music data selection unit (not shown) that selects music data. In the first embodiment, when the control unit 12 determines that the same plurality of music data can be acquired, the music data to be reproduced is based on the metadata of the plurality of music data and the evaluation data. Select.

  The control unit 12 is realized as a function of the processor 92 when the processor 92 in FIG. 1 executes a program stored in the memory 93. However, the control unit 12 may be realized in cooperation with a plurality of processors 92.

<Summary of Embodiment 1>
According to the first embodiment as described above, the music data to be reproduced is selected in consideration of the evaluation with respect to the sound quality of the attribute indicated by the evaluation data acquired as needed. Therefore, when the sound quality of the attribute changes, the change can be dealt with.

<Embodiment 2>
FIG. 3 is a block diagram showing a functional configuration of the music playback device 1 according to Embodiment 2 of the present invention. In the music playback device 1 according to the second embodiment, the same or similar components as those described above are denoted by the same reference numerals, and different portions will be mainly described.

  The music playback device 1 in FIG. 3 includes an evaluation data storage unit 13 in addition to the acquisition unit 11 and the control unit 12 described above. Further, the music playback device 1 is connected to a separate audio output unit 46 corresponding to the audio output device of FIG. The control unit 12 can control the audio output control unit 46 a included in the audio output unit 46 to cause the audio output unit 46 to output audio of music data or the like. Similarly, the music playback device 1 is connected to a separate display unit 47 corresponding to the display device of FIG. The control unit 12 can control the display control unit 47 a included in the display unit 47 to display the music name, artist name, and the like of the music data on the display unit 47.

  Next, each component of the music playback device 1 will be described.

  The acquisition unit 11 includes a wireless communication interface 11a, a wired communication interface 11b, and a communication unit 11c.

  The wireless communication interface 11a is configured to receive a wireless signal on which music data or the like is superimposed. For example, the wireless signal is transmitted from the mobile terminal 41a such as a mobile phone, a smartphone, and a tablet using a communication format such as Bluetooth (registered trademark), wireless LAN (Local Area Network), and WiFi (registered trademark). Applied signal is applied. However, the wireless signal transmission source and the communication format are not limited to these.

  The wired communication interface 11b is configured to be accessible to a storage medium storing music data and the like. As the storage medium, for example, a portable terminal and a portable music player that can be connected to the wired communication interface 11b via a CD (Compact Disc), a DVD, and a USB (Universal Serial Bus) are applied. Is done. However, the storage medium is not limited to these.

  The communication unit 11c acquires music data and metadata of the music data from the above-described wireless signal (wireless music data source) through the wireless communication interface 11a, and outputs the data to the control unit 12. Similarly, the communication unit 11c acquires music data and metadata of the music data from the storage medium (wired music data source) described above via the wired communication interface 11b, and outputs the data to the control unit 12. To do.

  The communication unit 11c not only acquires music data and metadata, but also acquires the above-described evaluation data via at least one of the wireless communication interface 11a and the wired communication interface 11b. For example, the communication unit 11c acquires evaluation data from a server (not shown) via the wireless communication interface 11a.

  In the second embodiment, the evaluation data includes subjective evaluation data and objective evaluation data. Subjective evaluation data is data indicating the number of points assigned based on the result of actual hearing of sound by humans, and objective evaluation data is the number of points assigned based on the result of measuring some property of sound. It is the data shown.

  For example, data obtained by using an average opinion score method or a MUSHRA (MUltiple Stimuli with Hidden Reference and Anchor) method is applied to the subjective evaluation data. For example, data obtained by using a PESQ (Perceptual Evaluation of Speech Quality) method is applied to the objective evaluation data. In these subjective evaluation data and objective evaluation data, the higher the sound quality evaluation, the larger the above-mentioned score.

  In the second embodiment, the communication unit 11c acquires the above-described evaluation data as needed. For example, the communication unit 11c (acquiring unit 11) evaluates at least one of the time when the music playback device 1 is turned on and the time when the music playback device 1 tries to select music data. Get the data.

  Based on the evaluation data acquired by the communication unit 11c, the control unit 12 arranges attributes in descending order of evaluation. When the evaluation data includes subjective evaluation data and objective evaluation data as in the second embodiment, the control unit 12 performs an arithmetic average or a weighted average on the scores, and an average obtained thereby Arrange attributes in descending order of value. The control unit 12 stores the obtained attribute order in the evaluation data storage unit 13. Such data processing and storage is performed each time the communication unit 11c acquires evaluation data.

  4-6 is a figure which shows an example of the order of the attribute memorize | stored in the evaluation data storage part 13. FIG. Specifically, FIG. 4 shows an example of the order of wired music data sources arranged in descending order of sound quality evaluation, and FIG. 5 shows compression arranged in descending order of sound quality evaluation. An example of the order of the formats is shown, and FIG. 6 shows an example of the order of the wireless music data sources arranged in order from the highest sound quality evaluation.

  Based on the metadata, the control unit 12 determines, for example, whether or not the same music data can be acquired from one or more music data sources for music (music) to be reproduced from the user. Here, when the song name and artist name in one music data match the song name and artist name in another music data, the control unit 12 determines that the one music data and the other music data are the same. It is determined that Note that this determination is not limited to this. For example, the control unit 12 may perform the determination in consideration of the release date of the music.

  As in the first embodiment, when the control unit 12 determines that the same plurality of music data can be acquired, the music to be played back based on the metadata of the plurality of music data and the evaluation data Select data. However, in the second embodiment, when it is determined that the same plurality of music data can be acquired, the control unit 12 is based on the metadata and the order of the attributes stored in the evaluation data storage unit 13. Among the plurality of attributes indicated by the metadata of the plurality of music data, music data having the highest evaluation in the evaluation data is selected as music data to be reproduced.

  Then, the control unit 12 reproduces the selected music data and causes the audio output unit 46 to output the sound of the music data. At this time, the control unit 12 may cause the display unit 47 to display the attributes of the selected music data (for example, the song name, artist name, music data source type, compression format, etc. of the music data).

<Operation>
FIG. 7 is a flowchart showing the operation of the music playback device 1 according to the second embodiment. The operation shown in FIG. 7 starts when, for example, an input unit (not shown) receives music (music) to be reproduced from the user. Although not shown, the order of attributes stored in the evaluation data storage unit 13 is updated each time the communication unit 11c (acquisition unit 11) acquires evaluation data, separately from the operation of FIG. To do.

  First, in step S1, the communication unit 11c (acquisition unit 11) acquires metadata indicating an attribute of music data from a music data source.

  In step S2, the control unit 12 determines, based on the acquired metadata, whether or not the same music data can be acquired from one or more music data sources for the music received from the user. If it is determined that acquisition is possible, the process proceeds to step S3, and if not, the process proceeds to step S12.

  In step S3, the control unit 12 determines whether or not the music data can be acquired from the wired music data source for the music received from the user based on the metadata of the plurality of music data. Here, the control unit 12 determines that music data can be acquired from the wired music data source when the plurality of music data sources includes at least one wired music data source. For example, not only when a plurality of music data sources include only a plurality of wired music data sources, but also when both a wired music data source (for example, USB) and a wireless music data source (for example, a Bluetooth signal) are included. The unit 12 determines that music data can be acquired from the wired music data source. On the other hand, when the plurality of music data sources include only the plurality of wireless music data sources, the control unit 12 determines that the music data cannot be acquired from the wired music data source. If it is determined that acquisition is possible, the process proceeds to step S4, and if not, the process proceeds to step S8.

  In step S4, the control unit 12 determines whether or not the music data can be acquired from the plurality of wired music data sources for the music received from the user based on the metadata of the plurality of music data. If it is determined that acquisition is possible, the process proceeds to step S5, and if not, the process proceeds to step S6.

  In step S5, the control unit 12 sets, as music data to be reproduced, music data of the wired music data source with the highest evaluation data evaluation among the plurality of wired music data sources indicated by the metadata of the plurality of music data. select.

  For example, when the order of the wired music data sources as shown in FIG. 4 is stored in the evaluation data storage unit 13, the metadata of the plurality of music data acquired in step S1 is a portable type via CD and USB. Assume a case where a plurality of wired music data sources called music playback devices are shown. In such a case, the control unit 12 selects, as music data to be played, music data of the CD having the highest evaluation data evaluation value among portable music playback devices via CD and USB.

  In step S6, the control unit 12 determines whether or not a plurality of compressed music data can be acquired from one wired music data source for the music received from the user based on the metadata of the plurality of music data. judge. If it is determined that acquisition is possible, the process proceeds to step S7, and if not, the process proceeds to step S12.

  In step S7, the control unit 12 selects, as music data to be reproduced, music data in a compression format having the highest evaluation of evaluation data among a plurality of compression formats indicated by metadata of the plurality of music data.

  For example, when the order of the compression formats as shown in FIG. 5 is stored in the evaluation data storage unit 13, the metadata of the plurality of music data acquired in step S1 includes the plurality of compression formats WMA and AAC. Assume the case shown. In such a case, the control unit 12 selects WMA music data having the highest evaluation data among WMA and AAC as music data to be reproduced. Thereafter, the process proceeds to step S12.

  In the foregoing, the operation of selecting music data to be reproduced with respect to the wired music data source and the compression format has been described in steps S4 to S7. In this operation, the operation in which the wired music data source is replaced with the wireless music data source is performed in steps S8 to S11.

  Specifically, in step S8, the control unit 12 determines whether or not music data can be acquired from a plurality of wireless music data sources for the music received from the user based on the metadata of the plurality of music data. judge. If it is determined that acquisition is possible, the process proceeds to step S9, and if not, the process proceeds to step S10.

  In step S9, the control unit 12 sets, as music data to be reproduced, music data of the wireless music data source having the highest evaluation data among the plurality of wireless music data sources indicated by the metadata of the plurality of music data. select.

  In step S10, the control unit 12 determines whether or not music data in a plurality of compressed formats can be acquired from a single wireless music data source for the music received from the user based on the metadata of the plurality of music data. judge. If it is determined that acquisition is possible, the process proceeds to step S11, and if not, the process proceeds to step S12.

  In step S11, the control unit 12 selects, as music data to be reproduced, music data in a compressed format having the highest evaluation of evaluation data among a plurality of compression formats indicated by metadata of the plurality of music data. Thereafter, the process proceeds to step S12.

  When the process proceeds from step S <b> 2 to step S <b> 12, the control unit 12 reproduces one piece of music data and causes the sound output unit 46 to output the sound of the music data. When the process proceeds from step S6, S7, S10, S11 to step S12, the control unit 12 reproduces the selected music data and causes the audio output unit 46 to output the audio of the music data.

<Summary of Embodiment 2>
According to the second embodiment as described above, the music data to be reproduced is selected in consideration of the evaluation with respect to the sound quality of the attribute indicated by the evaluation data acquired as needed, as in the first embodiment. Therefore, when the sound quality of the attribute changes, the change can be dealt with.

  Further, according to the second embodiment, the control unit 12 selects music data having an attribute with the highest evaluation data among a plurality of attributes as music data to be reproduced. Thereby, the user can listen to music data with as good a sound quality as possible.

  Further, according to the second embodiment, the acquisition unit 11 is at least one of the time point when the music playback device 1 is turned on and the time point when the music playback device 1 tries to select music data. At the time, obtain evaluation data. Thereby, music data can be selected using comparatively new comparison data. In addition, it is not restricted to this, The acquisition part 11 may acquire evaluation data at the time of every fixed period.

  Further, according to the second embodiment, in step S3, if the control unit 12 can acquire music data from a wired music data source, the control unit 12 may or may not be able to acquire music data from a wireless music data source. First, select the music data of the wired music data source. That is, the control unit 12 selects the music data of the wired music data source as the music data to be reproduced in preference to the music data of the wireless music data source. According to such a configuration, sound skipping can be reduced, so that the user can listen to music data with as good a sound quality as possible.

<Modification 1>
In the second embodiment, the control unit 12 selects music data to be played back regarding the compression format. However, even if the compression format is the same, the sound quality is generally different if the bit rate is different. Therefore, when the bit rate is included in the attribute, the control unit 12 arranges the bit rates in descending order of the evaluation based on the evaluation data acquired by the communication unit 11c, as in the compression format. The order of bit rates obtained by the above may be stored in the evaluation data storage unit 13. FIG. 8 shows an example of the order of bit rates stored in the evaluation data storage unit 13.

  Further, after step S6, S7, S10 or S11 of FIG. 7, the control unit 12 determines whether or not a plurality of music data having different bit rates can be acquired based on the metadata of the plurality of music data. May be. And when it determines with the control part 12 being acquirable, you may select the music data of the bit rate with the highest evaluation of evaluation data among several bit rates as music data which should be reproduced | regenerated.

<Modification 2>
In the second embodiment, the evaluation data has been described as including both subjective evaluation data and objective evaluation data. However, the present invention is not limited to this. Even if the evaluation data includes any one of subjective evaluation data and objective evaluation data, the same operation and action as described above can be realized.

  In the second embodiment, the subjective evaluation data is data obtained by using the average opinion score method or the MUSHRA method, but is not limited to this. Similarly, the objective evaluation data is data obtained by using the PESQ method, but is not limited to this.

  Further, in the second embodiment, it has been described that the communication unit 11c (acquisition unit 11) acquires music data metadata from a music data source (storage medium, wireless signal). However, the present invention is not limited to this. For example, the communication unit 11c (acquisition unit 11) determines the type of the music data source among the metadata attributes in consideration of the relationship between the wireless communication interface 11a and the wired communication interface 11b. You may judge.

<Other variations>
In the above description, the control unit 12 is realized by the processor 92 of FIG. 1 operating according to the software program stored in the memory 93 or the like. However, instead of this, the control unit 12 may be realized by a signal processing circuit that realizes the operation by a hardware electric circuit. The term “processing circuit” can also be used as a concept combining the software control unit 12 and the hardware control unit 12.

  In addition, the music playback device described above includes an installed navigation device that can be mounted on a vehicle, a portable navigation device, a communication terminal (for example, a mobile terminal such as a mobile phone, a smartphone, and a tablet), and an application installed in these devices. It is also possible to apply the present invention to a music playback system constructed as a system by appropriately combining these functions and a server. In this case, each function or each component of the music playback device described above may be distributed and arranged in each device that constructs the system, or may be concentrated on any device. . In addition, for example, the music playback device may include at least one of the audio output unit 46 and the display unit 47 which are separate in the above description.

  FIG. 9 is a block diagram showing a configuration of the server 51 according to this modification. The server 51 of FIG. 9 includes a communication unit 51a and a control unit 51b, and can perform wireless communication with the communication unit 53a included in the music playback device 53 of the vehicle 52.

  The communication part 51a (acquisition part) receives the metadata which shows the attribute of the music data which the music reproduction apparatus 53 can acquire by performing wireless communication with the communication part 53a, and the evaluation which shows evaluation with respect to the sound quality of the said attribute Receive data from time to time.

  The control unit 51b has a function similar to that of the above-described control unit 12 when a processor (not illustrated) of the server 51 executes a program stored in a storage device (not illustrated) of the server 51. That is, when the control unit 51b determines that the music reproducing device 53 can acquire the same plurality of music data, the music to be reproduced based on the metadata of the plurality of music data and the evaluation data. Select data. Then, the communication unit 51 a transmits the selection result of the control unit 51 b to the music playback device 53.

  According to the server 51 configured as described above, when the sound quality of the attribute changes, as in the music playback device 1 described in the first embodiment, the change can be dealt with.

  FIG. 10 is a block diagram showing the configuration of the communication terminal 56 according to this modification. The communication terminal 56 in FIG. 10 includes a communication unit 56a similar to the communication unit 51a and a control unit 56b similar to the control unit 51b, and performs wireless communication with the communication unit 58a included in the music playback device 58 of the vehicle 57. It is possible to do. As the communication terminal 56, for example, a mobile terminal such as a mobile phone, a smartphone, and a tablet carried by the driver of the vehicle 57 is applied. According to the communication terminal 56 configured in this way, as in the music playback device 1 described in the first embodiment and the server 51 in FIG. it can.

  It should be noted that the present invention can be freely combined with each embodiment and each modification within the scope of the invention, and each embodiment and each modification can be appropriately modified and omitted.

  DESCRIPTION OF SYMBOLS 1 Music playback apparatus, 11 acquisition part, 12 control part.

Claims (6)

A music playback device for playing back music data that can be acquired from a music data source,
An acquisition unit that acquires metadata indicating the attribute of the music data and acquires evaluation data indicating an evaluation of the sound quality of the attribute at any time;
When it is determined that a plurality of music data having the same music title and artist name can be acquired based on the metadata , reproduction is performed based on the metadata of the plurality of music data and the evaluation data. A control unit for selecting music data to be
The plurality of music data sources are:
A wired music data source from which the music data is acquired via a wired line; and a wireless music data source from which the music data is acquired via a wireless line;
The controller is
Prioritize the music data of the wireless music data source, select the music data of the wired music data source, and select from the selected music data as the music data to be played based on the evaluation data A music playback device. The music playback device according to claim 1,
The controller is
A music playback device that selects, as music data to be played, music data having the highest evaluation of the evaluation data among the plurality of attributes indicated by the metadata of the plurality of music data. The music playback device according to claim 1 or 2, wherein
The acquisition unit
A music playback device that acquires the evaluation data at least one time point when a power source of the music playback device is turned on and a time point when the music playback device attempts to select the music data. The music playback device according to any one of claims 1 to 3, wherein
The evaluation data is
A music playback device including at least one of subjective evaluation data and objective evaluation data. The music playback device according to claim 4,
The subjective evaluation data is data obtained by using an average opinion score method or a MUSHRA method,
The objective evaluation data is a music playback device which is data obtained by using the PESQ method. A music playback method for playing back music data that can be acquired from a music data source,
Acquiring metadata indicating the attribute of the music data, and at any time acquiring evaluation data indicating an evaluation of the sound quality of the attribute,
When it is determined that a plurality of music data having the same music title and artist name can be acquired based on the metadata , reproduction is performed based on the metadata of the plurality of music data and the evaluation data. Select the music data to be
The plurality of music data sources are:
A wired music data source from which the music data is acquired via a wired line; and a wireless music data source from which the music data is acquired via a wireless line;
Prioritize the music data of the wireless music data source, select the music data of the wired music data source, and select from the selected music data as the music data to be played based on the evaluation data To play music.

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