JP2009272014A - Music data playback device, and music data selecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily select a target music data with a simple operation even when the music data to be played back has a complicated hierarchical structure. <P>SOLUTION: In a music data playback device 1 having a rotary encoder 10 to set a playback sound volume of the music data through a rotational operation of a dial, an operational mode changing means 40 to select a layer including the desired one of a plurality of music data stored in a recording medium and having the hierarchical structure, or to select the desired music data from the selected layer through the rotational operation of the rotary encoder 10 is installed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a music data playback device and a music data selection method.

  2. Description of the Related Art Conventionally, a multi-disc disk reproducing device (so-called CD changer player) has been used as a music data reproducing device capable of continuously reproducing a large number of music data. The conventional multi-disc playback device is configured to store a plurality of music CDs in a magazine in advance and to play back desired music in an arbitrary order. It's being used.

  The music CD includes one data session, and a plurality of music data stored in the data area are sequentially stored according to the track number without being hierarchized. For this reason, when selecting arbitrary music data from a plurality of music CDs stored in the magazine of the multi-disc disk playback device, first, an operation of selecting a disk containing the target music data is performed, and then It is necessary to perform an operation of selecting a target track from the selected disc.

  In order to facilitate the music data selection operation as described above, many conventional multi-disc playback apparatuses include a cross key (four-way key) in the operation unit (for example, Patent Document 1). The cross key is an operation input device in which four keys (up key, down key, left key, and right key) that are pressed down with a fingertip are arranged in a cross shape.

  In order to select desired music data using a cross key in a conventional multi-disc player, first select a music CD (disc) containing the desired music data by pressing the up key or the down key. Next, an operation of selecting desired music data (track) stored in the selected CD by pressing the left key or the right key is performed.

JP 2004-296083 A

  By the way, in recent years, MP3 format music data that can be compressed to about 1/10 while maintaining the same sound quality as a music CD has been used, and various MP3 format music data can be reproduced. A music data reproducing apparatus is provided. Since MP3 format music data can be easily edited by a personal computer, the user can store a large number of favorite music data in the music data reproducing apparatus.

  MP3 format music data stored in various recording media such as disc-type recording media such as CD-R and CD-RW and so-called USB memories as well as music CDs in in-vehicle music data playback devices. Is provided that can be played. This is because by compressing the music data and storing it in the recording medium, the number of music data that can be continuously reproduced by the in-vehicle music data reproducing device can be dramatically increased.

  However, unlike music data stored on a music CD, MP3 format music data is usually layered and stored on a recording medium. 5 and 6 show examples of the hierarchical structure of the music data. In any case, the layered music data is the first folder hierarchy that is the highest hierarchy, the second folder hierarchy that is the lower hierarchy of the first hierarchy, and the second hierarchy that is the lower hierarchy of the second folder hierarchy. 3 shows an example composed of three folder hierarchies. Here, the first folder hierarchy includes only folder 1 which is the root folder. The second folder hierarchy includes (M−N + 1) folders including folder 2, folder (N + 1),..., Folder (N + M), and two files including file 11 and file 12. The third folder hierarchy includes (N−2) folders consisting of folder 3, folder 4,. The folder N exemplifies a case where the file N, n files 32,... Here, the number of the root folder is set to 1, and the number of the folder to be moved immediately below is sequentially set to 2, 3,..., N, but the method of assigning the folder number is arbitrary.

  As a method of using the hierarchical structure as described above, it is assumed that a folder with a certain artist name is created, and data files of music pieces performed by the artist are collectively stored therein. Further, in the case of adopting such a data structure, since one music CD storing a plurality of music data files may be regarded as one folder, the music data is a music CD having no hierarchical structure. This is convenient for collectively handling the recording medium storing the layered music data.

  FIG. 7 shows an example of a music data reproducing apparatus that the applicant has studied for reproducing hierarchical music data. The music data playback apparatus 100 is configured as an in-vehicle audio device, and is used to select a rotary encoder 110 for setting the playback volume of music by rotating the dial 111 and music data to be played back. The cross key 120 and music data display means 130 for displaying the selected music data are provided in the operation unit.

  The music data reproducing apparatus 100 also includes an operation mode switching unit 140 for assigning a music data selection function to the cross key 120. When the operation mode switching unit 140 is pressed, the operation mode is switched so that the cross key 120 functions as a music data selection unit. In an in-vehicle music data reproducing apparatus that is required to be compact, the number of keys that can be arranged on the operation unit is severely limited. For this reason, it is desirable to assign a plurality of functions to one key and change the function for the input operation as appropriate by switching the operation mode.

  When the music data is selected by using the cross key 120 from the hierarchical music data shown in FIG. 5 or 6 by the cross key 120 of the music data reproducing apparatus 100 studied by the applicant, First, the operation mode switching means 140 is operated to switch to an operation mode for selecting music data with the cross key 120. Then, the folder hierarchy including the target music data is selected by pressing the up key 120U or the down key 120D, and the folder hierarchy is determined by pressing the confirm key 121. Next, the target music data file included in the selected folder hierarchy is selected by pressing the left key 120L or the right key 120R. Thereafter, the operator confirms that the music data selected by the cross key 120 and displayed on the display unit 130 is the target, and then presses the confirmation key 121 arranged at the center of the cross key 120. By operating, the music data to be reproduced is determined.

  Assume that folder 1 is selected and folder 1 is displayed on the music data display means 130. Here, each time the lower 120D key of the cross key 120 is pressed, the selected folder hierarchy is changed one by one in the order of the first folder hierarchy → the second folder hierarchy → the third folder hierarchy. Then, folder 1, folder 2, and folder 3 are sequentially displayed on the music data display means 130. Conversely, each time the upper key 120U of the cross key 120 is pressed, the selected folder hierarchy is one by one in the order of third folder hierarchy → second folder hierarchy → first folder hierarchy. As a result, folder 3, folder 2, and folder 1 are sequentially displayed on the music data display means 130.

  Further, in a state where the folder 1 of the first folder hierarchy is selected and the folder 1 is displayed on the music data display means 130, the folder hierarchy is confirmed by depressing the confirmation key 121. Next, each time the right key 120R of the cross key 120 is pressed once, two files included in the folder 1 are selected in the order of file 11 → file 12, and sequentially displayed on the music data display means 130. The On the contrary, each time the left key 120L of the cross key 120 is pressed once, these two files are selected in the order of file 12 → file 11, and are sequentially displayed on the music data display means 130.

  Similarly, in the state where the folder (M + N) of the second folder hierarchy is selected and the folder (M + N) is displayed on the music data display means 130, the folder hierarchy is confirmed by pressing the enter key 121. Next, every time the right key 120R of the cross key 120 is pressed once, four files included in the folder (M + N) are selected in the order of file 21 → file 22 → file 23 → file 24, The data are sequentially displayed on the data display means 130. Conversely, each time the left key 120L of the cross key 120 is pressed once, these four files are selected in the order of file 24 → file 23 → file 22 → file 21 and are displayed on the music data display means 130. Displayed sequentially. The operation for the third folder hierarchy is the same.

  By setting the function of the cross key 120 as described above, even if the music data is hierarchized, it can be operated in the same way as a multi-disc playback device for playing a music CD. It becomes like this. The music data is stored regardless of whether the recording medium storing the music data is a music CD or a recording medium such as a CD-R, CD-RW, or USB memory storing MP3 format music data. The playback apparatus 100 can be operated.

  However, in the music data reproducing apparatus 100 that the applicant has been considering, it has been found that it is difficult to select desired music data by operating the cross key 120 from among a large number of hierarchical music data. It was. That is, in the case of selecting the hierarchical music data with the cross key 120, it is necessary to press the key at least once in order to change the music data folder hierarchy or one folder or file in a certain hierarchy. There is. For this reason, when a large number of music data folder hierarchies are formed, or when a large number of folders and files are included in the same hierarchy, the cross key 120 is pressed several times to select desired music data. However, there is a problem that the operation is extremely complicated because it is necessary to repeatedly perform the pressing operation. The problem of complicated operation becomes significant when a large amount of compressed music data such as MP3 format is stored in a hierarchical manner on a recording medium such as a CD-R or USB memory. On the other hand, when the music data reproducing apparatus is used as an in-vehicle audio device, good operability is particularly important from the viewpoint of safe driving.

  In the music data playback device 100, in order to confirm the selected music data and start playback, the cross key is used after visually confirming that the music data displayed on the music data display means 130 is intended. The music data to be reproduced must be confirmed by depressing a confirmation key 121 provided separately from each key 120. For this reason, in order to depress the enter key 121, the finger placed on one of the keys of the cross key 120 must be moved to the enter key 121, resulting in poor operability.

  Further, since the cross key 120 requires a larger area than the other keys, the in-vehicle music data playback apparatus 100 that is compact and requires good operability is There is also a problem that it is difficult to secure a degree of freedom in the design of the part. Furthermore, there is a problem that the cross key 120 is more expensive than other key devices.

  The present invention has been proposed in view of such problems, and even if the music data to be reproduced has a complicated hierarchical structure, the target music data can be easily selected by a simple operation. It is another object of the present invention to provide a music data device and a music data selection method that can be implemented without using a cross key.

  In order to solve the above problems, a music data playback apparatus according to the present invention is a music data playback apparatus having a rotary encoder for setting the playback volume of music data by rotating a dial, and is stored in a recording medium. An operation mode for causing a rotary encoder to perform an operation of selecting a hierarchy including desired music data from a plurality of music data having a hierarchical structure, or an operation of selecting desired music data from the selected hierarchy. It is characterized by comprising switching means.

  According to another aspect of the present invention, there is provided a music data playback apparatus having a rotary encoder for setting a playback volume of music data by rotating a dial, and a plurality of music having a hierarchical structure stored in a recording medium. A first key for selecting a hierarchy including the desired music data from the data, and an operation mode switching means for substituting the operation for selecting the desired music data from the selected hierarchy by a rotary operation of the rotary encoder And music data display means for displaying the selected music data.

  Furthermore, a music data playback device according to another invention is a music data playback device having a rotary encoder for setting a playback volume of music data by rotating a dial, and a plurality of music having a hierarchical structure stored in a recording medium. An operation mode switching means for substituting an operation for selecting a hierarchy including desired music data from the data by a rotary operation of the rotary encoder, and a second key for selecting desired music data from the selected hierarchy; And music data display means for displaying the selected music data.

  According to another aspect of the present invention, there is provided a music data playback apparatus having a rotary encoder for setting a playback volume of music data by rotating a dial, and a plurality of music having a hierarchical structure stored in a recording medium. A first key for selecting a hierarchy including desired music data from the data, a second key for selecting desired music data from the selected hierarchy, and music data for displaying the selected music data It is characterized by comprising display means and operation mode switching means for substituting the operation of the first key or the second key by the rotation operation of the rotary encoder.

  Furthermore, in addition to the above invention, the music data reproducing device of another invention further includes a confirmation key arranged coaxially with the dial of the rotary encoder for confirming the music data displayed on the music data display means. ing.

  In addition, the music data selection method of the present invention for solving the above-mentioned problem is to select desired music data in the music data selection method for selecting desired music data from a plurality of music data having a hierarchical structure. An operation mode switching detection step for detecting that the operation mode switching means is operated to switch the operation to the alternative operation mode to be replaced by the rotation operation of the rotary encoder for setting the reproduction volume of the music data; When it is detected that the operation mode switching means has been operated in the mode switching detection step, an operation mode confirmation step for confirming that the operation mode of the rotary encoder has not been switched to the alternative operation mode, and a rotary operation in the operation mode confirmation step. Encoder is not switched to alternative operation mode When confirming the door and is characterized in that it comprises a rotation operation detecting step of detecting that the rotary encoder is rotating operation.

  Further, the music data selection method of another invention is based on the number of pulses output in accordance with the rotary operation amount of the rotary encoder detected in the rotation operation detection step in addition to the music data selection method described above. The music data display step displays the data folder or file sequentially on the music data display means, and the confirmation data arranged coaxially with the dial of the rotary encoder operates the music data display means. And a song data confirmation step for deterministically selecting a folder or file of the song data.

  According to the present invention, even if the music data to be reproduced is hierarchized, the target music data can be easily obtained without repeatedly operating the key for selecting the music data. Can be selected.

Embodiments of the present invention will be described below with reference to the drawings.
<Music data playback device>

  FIG. 1 shows an operation unit of a music data playback apparatus 1 according to an embodiment of the present invention. This music data reproducing apparatus 1 includes a recording medium storage means (not shown), and is not only a music CD but also a CD-R, CD-RW, USB in which MP3 format music data is recorded in a hierarchical manner. The music data stored in various recording media such as a memory can be read and reproduced. Moreover, although the music data reproducing apparatus 1 is configured as an in-vehicle audio device, it may be used for other purposes such as home audio.

  The music data playback apparatus 1 includes a rotary encoder 10 for setting the playback volume of music by rotating the dial 11, a confirmation key 12, and a first key 20 and a second key for selecting music data to be played back. 21, a music data display unit 30 for displaying the selected music data, and an operation mode switching unit 40 are provided in the operation unit.

  The dial 11 of the rotary encoder 10 is an operation input detecting unit that can detect that an operation input has been made, a rotation direction, and a rotation amount by outputting a pulse in response to the rotation operation. The dial 11 can be rotated endlessly in either the left or right direction by a fingertip, and a click feeling is generated for each rotation of a predetermined angle.

  It should be noted that when one unit pulse is output from the rotary encoder 10, one folder hierarchy or folder / file of music data may be changed, but a folder hierarchy of music data by two or more pulses. Etc. may be changed. It is also possible to change the folder hierarchy and folder / file of music data based on the analog signal output from the rotary encoder 10.

  In the music data reproducing apparatus 1 according to the embodiment of the present invention, a first key (up / down key) 20 and a second key (left / right key) 21 are used in place of the cross key 120 provided in the operation unit of the music data reproducing apparatus 100. Are arranged separately. The first key 20 (hereinafter also referred to as “up / down key”) includes an upper key 20U and a lower key 20D. Each time the key 20 is operated, the music data layer is directed from the current layer to a higher layer or a lower layer. It has a function to change sequentially one by one. The second key 21 (hereinafter also referred to as a left / right key) includes a left key 21L and a right key 21R, and has a function of sequentially changing files and folders in a hierarchy one by one each time it is operated. is doing. The first key 20 and the second key 21 are constituted by, for example, a switch that generates an operation signal in response to a pressing operation or a touch-type switch that generates an operation signal by touching a fingertip or the like.

  The music data selected by operating the first key 20 and / or the second key 21 is displayed on the music data display means 30. The operator selects the target music data by operating the first key 20 and / or the second key 21 while watching the music data display means 30, and further plays the music played by operating the enter key 11. Confirm the data. The music data display means 30 is configured by appropriately using a known display element such as a liquid crystal, a fluorescent display tube, a light emitting diode, a plasma display, or an organic EL element.

  Here, the case where the music data display means 30 can display only one line of information related to the music data is illustrated, but it may be displayed over a plurality of lines. In that case, it is possible to display a hierarchical structure (tree structure) of music data, display folder names and file names, and display them simultaneously. Further, the lyrics and artist names of the music may be displayed together with the folder name and file name.

  When the music data is being reproduced (volume setting mode), the dial 11 of the rotary encoder 10 functions as a means for setting the reproduction volume of the music data by a rotation operation (volume function). On the other hand, the dial 11 of the rotary encoder 10 functions as the second key 21 by a rotating operation when the operation mode switching means 40 is operated when selecting music data to be reproduced (browsing function). That is, it functions as a means for substituting the function of the second key 21 by rotating the dial 11 (alternative operation mode).

  The key whose function is substituted by rotating the dial 11 is not necessarily the second key 21 but may be the first key 20. Moreover, you may enable it to select either according to a user's liking. The operation mode switching means 40 is configured by, for example, a switch that generates an operation signal in response to a pressing operation or a touch-type switch that generates an operation signal by touching a fingertip or the like.

  The rotary encoder 10 includes a confirmation key 12 for confirming the selected folder hierarchy and / or music data, as well as the dial 11 to be rotated. The confirmation key 12 may be disposed inside the dial 11 or may be disposed so as to press the entire dial 11. In any case, it is desirable that the confirmation key 12 be arranged coaxially with the dial 11 so that it can be operated subsequent to the rotation operation of the dial 11. Such a confirmation key 12 can be configured by a switch that generates an operation signal when pressed.

  The above-described operation in the music data reproducing apparatus 1 is realized by a circuit configuration as shown in FIG. That is, when any one of the first key 20, the second key 21, and the operation mode switching means 40 constituting the key matrix is operated, an operation input signal is sent to the microcomputer 60 via the key input processing unit 50. It is done. Further, when the confirmation key 12 provided on the rotary encoder 10 is operated, an operation input signal is also sent to the microcomputer 60 via the key input processing unit 50.

  On the other hand, when the dial 11 of the rotary encoder 10 is rotated, an output pulse corresponding to the rotation amount and the rotation direction is sent to the microcomputer 60. The microcomputer 60 sends information related to the selected music data to the display driver 70 based on the operation input signals from the keys 20, 21, 40, 12 and the dial 11 of the rotary encoder. Then, the display output from the display driver 70 is displayed on the music data display means 30 provided in the operation unit of the music data reproducing apparatus 1.

  As described above, the music data playback device 1 does not include a cross key in the operation unit. Since the first key (up / down key) 20 and the second key (left / right key) 21 instead of the cross key of the music data reproducing apparatus 100 are both formed in an elongated shape, the degree of freedom is large when arranged on the operation unit. The operation unit can be used effectively.

  In the present embodiment, the rotary encoder 10, the first key 20, the second key 21, and the operation mode switching means 40 are arranged on the left side of the operation unit, and the music data display means 30 is arranged on the right side of the operation unit. Is arranged. According to such an arrangement, when the operator operates a plurality of keys, it is not necessary to move the fingertips greatly, and the area of the music data display means 30 is made larger than before and the visibility is improved. Therefore, it contributes to improving the operability of the music data reproducing apparatus 1.

  The second key 21 whose function is replaced by the dial 11 of the rotary encoder 10 may not be provided in the operation unit. Further, when the rotary encoder 10 is to be substituted for one of the functions of the first key 20 and the second key 21 according to the user's preference, the dial 11 of the first key 20 and the second key 21 functions. An alternative key may not be provided on the operation unit. In this way, the area of the music data display means 30 can be further increased, and the operability of the music data playback device 1 can be further improved.

<Music data selection method>
Next, a music data selection method in the music data reproducing apparatus 1 shown in FIG. 1 will be described with reference to FIGS. 1, 3 and 4.

  3 and 4 show a case where the music data selection method according to the embodiment of the present invention is applied to the music data reproducing apparatus 1 to select target music data from a plurality of layered music data. It is a flowchart which shows the procedure of. The process for selecting the music data is a mode switching process (shown in FIG. 3) of the rotary encoder of the music data reproducing apparatus 1 and a process when the dial 11 of the rotary encoder 10 is subsequently rotated (FIG. 3). 4).

  When the music data reproducing apparatus 1 is in the initial state (step S0), the music data reproducing apparatus 1 is in a standby state while constantly confirming whether any of the keys of the operation unit has been operated. When it is detected that any key of the operation unit has been operated, it is determined whether or not the operated key is the operation mode switching means 40 (step S1).

  In step S1, if the operated keys are other than the operation mode switching means 40, the process returns to the initial state and waits for the keys to be operated. On the other hand, when the operation mode switching means 40 is operated, the operation mode of the rotary encoder 10 is the volume setting mode for setting the playback volume of the music data, or the second key for selecting the music data. It is determined whether or not it is an alternative mode for substituting 21 functions (step S2).

  In step S2, if the rotary encoder 10 is switched to the alternative operation mode when the operation mode switching means 40 is operated, the volume setting mode is switched (S10). On the other hand, if the rotary encoder has been switched to the volume setting mode when the operation mode switching means 40 is operated, it is switched to the alternative operation mode (S20).

  After the operation mode is switched, the operation detection flow of the rotary encoder 10 is executed. First, in step 3, it is detected whether or not the dial 11 of the rotary encoder 10 has been rotated. Here, when the dial 11 is not rotated within a certain time, the process returns to the initial state (step S3) and waits for the dial 11 of the rotary encoder 10 to be operated. On the other hand, when the dial 11 of the rotary encoder 10 is rotated in step S3, the operation mode of the rotary encoder 10 is determined (step S4).

  If the rotary encoder 10 has been switched to the volume setting mode in step S4, the volume setting (step S30) is performed by rotating the dial 11, and then the dial 11 is returned to the initial state (step S3). Wait for operation. On the other hand, if the rotary encoder 10 has been switched to the alternative operation mode in step S4, the music data is selected by rotating the dial 11 (step S31), the music data is displayed (step S32), and the music data is confirmed ( After step S33) is executed, the process returns to the initial state (step S3).

  Each step S31, S32, S33 is specifically as follows. That is, a music data selection step (S31) for selecting music data by rotating the dial 11 of the rotary encoder 10, and a music data display step (S32) for displaying the selected music data on the music data display means 30. The music data confirmation step (S33) for confirming the music data displayed on the music data display means 30 by operating the confirmation key 12. When the selected music data is confirmed by operating the confirmation key 12, the process returns to the initial state (step S3).

  As described above, when the operation mode switching means 40 of the music data reproducing apparatus 1 is operated, the operation mode of the rotary encoder 10 is first detected, and the function of the dial 11 is determined based on the detection result. That is, by providing the operation mode confirmation step (S2) for confirming the operation mode of the rotary encoder 10, the function of the rotary encoder 10 is the operation mode of the rotary encoder 10 when the operation mode switching means 40 is operated. It is switched according to.

  The embodiment of the present invention is not limited to the above-described embodiment. For example, in the embodiment, it has been described that each time the up / down key 20 or the left / right key 21 is operated, the folder hierarchy of music data or the folders and files included in the selected hierarchy are changed one by one. By continuing to operate the keys 20 and 21 for a predetermined time or longer (long pressing), the selected folder hierarchy or the like may be continuously changed (fast-forwarded). Further, the folder hierarchy may be cyclically changed by continuously operating the up / down key 20 or the left / right key 21.

  Further, folders and files may be sequentially displayed according to a number assigned in advance. In that case, the music data is determined by operating the confirmation key 12 following the operation of the up / down key 20 or the left / right key 21, or the music data selected by the operation of the up / down key 20 or the left / right key 21 is constant. The music data may be determined when the music data display means 30 continues to be displayed for the above time.

  The music data display means 30 is selected when music data is displayed in units of folders as illustrated in FIG. 5 or when a folder hierarchy is selected with the up and down keys 20 as illustrated in FIG. It is also optional to display the music data in the folder hierarchy in units of files. For example, consider a case where the file 21 included in the folder (N + M) in the second folder hierarchy is selected. When the music data is displayed in folder units as shown in FIG. 5, (N + M), which is the folder in the second folder hierarchy, is confirmed by the confirmation key 12 using the up / down key 20, and each file is further displayed by the up / down key 20. And the operation of selecting the file 21 may be performed. On the other hand, when the music data is displayed in units of files as shown in FIG. 6, after performing the same operation, if the folder (N + M) is confirmed by the confirm key 12, the files 21, 22, and 22 included therein are included. ... the file 24 is displayed, and the left and right keys 21 may be operated to select a desired file.

  Further, the reproduction of the music data may be started simultaneously with the confirmation of the music data. In this case, as shown in FIG. 5, when the music data displayed on the music data display means 30 is in units of folders, the music data files stored in the folder are sequentially stored by the operation of the confirmation key 12. It can be played back. Also, as shown in FIG. 6, when the music data displayed on the music data display means 30 is in units of files, playback is started from the selected file by the operation of the enter key 12, and within the same folder The next file of the music data can be sequentially reproduced subsequently.

  Further, when the rotary encoder 10 is in the alternative operation mode, it is possible to reproduce the music already selected and displayed on the music data display means 30 by operating the operation mode switching means 40. Further, if the operation mode switching means 40 has the function of the confirmation key 12 or conversely the confirmation key 12 has the function of the operation mode switching means, the confirmation key 12 or the operation mode switching means 40 is omitted. It is possible.

It is a figure which shows the structural example of the operation part of the music data reproduction apparatus which concerns on embodiment of this invention. It is a block diagram which shows the principal part of the circuit for selecting the music data in the music data reproduction apparatus shown in FIG. It is a flowchart which shows the main procedures for determining the function of the rotary encoder in the music data reproduction apparatus shown in FIG. It is a flowchart which shows operation | movement of the rotary encoder in the music data reproduction apparatus shown in FIG. It is a figure which shows an example of the hierarchical structure of the music data reproduced | regenerated with the music data reproduction apparatus shown in FIG. 1, and is an example by which music data is displayed per folder. It is a figure which shows an example of the hierarchical structure of music data, and is an example by which the music data in the selected folder are displayed per file. It is a figure which shows the structural example of the operation part of the music data reproduction apparatus which the applicant examined previously.

Explanation of symbols

1 Music Data Playback Device 10 Rotary Encoder 11 Dial 12 Confirmation Key 20 First Key (Up / Down Key)
20U Up key 20D Down key 21 Second key (Left / Right key)
21L Left key 21R Right key 30 Music data display means 40 Operation mode switching means

Claims (7)

In a music data playback apparatus having a rotary encoder for setting the playback volume of music data by rotating the dial,
Rotation operation of the rotary encoder is an operation for selecting a hierarchy including desired music data from a plurality of music data having a hierarchical structure stored in a recording medium, or an operation for selecting desired music data from the selected hierarchy. An operation mode switching means for performing the above operation is provided. In a music data playback apparatus having a rotary encoder for setting the playback volume of music data by rotating the dial,
A first key for selecting a hierarchy including desired music data from a plurality of music data having a hierarchical structure stored in a recording medium;
An operation mode switching means for substituting an operation for selecting the desired music data from the selected hierarchy by a rotation operation of the rotary encoder; and a music data display means for displaying the selected music data. A music data reproducing apparatus characterized by the above. In a music data playback apparatus having a rotary encoder for setting the playback volume of music data by rotating the dial,
An operation mode switching means for substituting an operation for selecting a hierarchy including desired music data from a plurality of music data having a hierarchical structure stored in a recording medium by a rotation operation of the rotary encoder and the selected hierarchy A second key for selecting the desired music data;
A music data reproducing device comprising: music data display means for displaying the selected music data. In a music data playback apparatus having a rotary encoder for setting the playback volume of music data by rotating the dial,
A first key for selecting a hierarchy including desired music data from a plurality of music data having a hierarchical structure stored in a recording medium;
A second key for selecting the desired music data from the selected hierarchy;
Music data display means for displaying the selected music data;
An operation mode switching means for substituting the operation of the first key or the second key by a rotation operation of the rotary encoder.   5. The confirmation key according to claim 1, further comprising a confirmation key arranged on the same axis as the dial of the rotary encoder for confirming the music data displayed on the music data display means. Music data playback device. In a music data selection method for selecting desired music data from a plurality of music data having a hierarchical structure,
An operation mode for detecting the operation of the operation mode switching means for switching to an alternative operation mode in which an operation for selecting desired music data is replaced by a rotation operation of a rotary encoder for setting the playback volume of the music data A switching detection step;
An operation mode confirmation step for confirming that the operation mode of the rotary encoder is not switched to the alternative operation mode when detecting that the operation mode switching means is operated in the operation mode switching detection step;
A rotation operation detecting step for detecting that the rotary encoder has been rotated when it is confirmed in the operation mode confirmation step that the rotary encoder has not been switched to the alternative operation mode. Music data selection method. A music data display step for sequentially displaying the music data folder or file on the music data display means on the basis of the number of pulses output in accordance with the rotational operation amount of the rotary encoder detected in the rotational operation detection step; ,
By operating a confirmation key arranged coaxially with the dial of the rotary encoder, the music data confirmation for definitely selecting a music data folder or file displayed on the music data display means in the music data display step The music data selection method according to claim 6, further comprising:

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