JP4289228B2 - Playback apparatus and playback method - Google Patents

Description

  The present invention relates to a data reproducing apparatus and method having a function of randomly reproducing (shuffle) data such as music and video.

    As a technique for shuffle playback of music, for example, as disclosed in Patent Document 1, there is a technique in which the order of shuffle playback is first determined and stored in a RAM, and the music is played back according to the order. This can prevent duplicate music from being generated during shuffle playback.

  However, in the technique disclosed in Patent Document 1 described above, when switching from the normal playback mode to the shuffle mode, music that has already been played back in the normal mode is also played back redundantly. is there.

Therefore, in Patent Document 1, it is also possible to avoid such overlapping reproduction by performing a shuffle by limiting the selection target.
JP 2002-268542 A

  However, as in Patent Document 1, in order to limit the selection target in order to avoid duplicate reproduction, the user must memorize the songs that have been heard so far, and the operation for that is very troublesome. It will be a thing.

  Further, in Patent Document 1, since the order of shuffle playback is determined and stored in the RAM, the order is lost when the apparatus is turned off, and it is necessary to shuffle again. This cannot avoid duplicate reproduction. Therefore, it is conceivable to use RAM as a battery backup or non-developable memory, but there is a problem that the memory capacity for that purpose becomes very large.

  An object of the present invention is to provide a reproducing apparatus and a reproducing method capable of performing reproduction of random data by a simple operation so as not to overlap. An object of the present invention is to provide a playback device and a playback method that can perform random data playback without reducing the memory capacity.

  In order to achieve the above object, a playback device according to the present invention is a playback device capable of continuously playing back data from a data group including a plurality of data, and the data from the data group in a predetermined order. Means for switching between a first mode for reproducing and a second mode for reproducing data from the data group in a random order; and when reproducing data in the first mode, wherein the second mode When the second mode is reset or when the second mode is reset, means for removing the data already reproduced from the data group and reproducing the remaining data from the removed data group in a random order; It is characterized by comprising.

  A reproduction method according to another aspect of the present invention is a reproduction method for continuously reproducing data from a data group including a plurality of data, wherein the data is reproduced from the data group in a predetermined order. When data is switched from the data group to be played back in a random order, or when playback in the random order is reset, the data group is excluded except for data that has already been played back. The remaining data is reproduced from the data group in a random order.

  Here, the data is, for example, music data, video data, and the like.

  For example, when the data is music data, the data group may be a collection of a plurality of albums including a plurality of songs, or a single album.

  In the present invention, since the remaining data is reproduced in a random order from the data group from which the already reproduced data is removed, it is possible to prevent the data from being reproduced repeatedly when the data is reproduced randomly. it can. In other words, taking music reproduction as an example, the same song is not repeatedly heard in the random reproduction mode. Therefore, in the present invention, it is possible to perform reproduction of random data with a simple operation so as not to overlap.

  In the present invention, when the data is switched from the first mode to the second mode during the data reproduction in the first mode, or when the second mode is reset, It is preferable to start reproduction from the data and then reproduce the remaining data in a random order.

  As a result, the data being reproduced at the time of switching the random reproduction is not reproduced repeatedly or missing and reproduced.

  In the present invention, means for generating a random number, means for storing the generated random number, means for storing a first value indicating a position of data when switching to the second mode, the random number and Means for generating a sequence of numerical values uniquely determined by the first value and determining reproduction in a random order; and second data indicating a position of data at the time of stopping when the reproduction in the second mode is stopped Means for storing a value, and the reproduction means generates the sequence of numerical values based on the stored random number and the first value when restarting after stopping the reproduction in the second mode. The reproduction of data may be restarted from the data corresponding to the second value in the order based on the generated numerical value sequence.

  As these storage means, it can be said that it is preferable to keep the memory even when the reproduction apparatus is turned off. For example, a flash memory, a volatile memory with a battery backup, a hard disk, or the like can be used as the storage means.

  Thus, in order to resume random playback with reproducibility, instead of storing a sequence of numerical values generated based on random numbers, it is only necessary to store random numbers as corresponding data, Therefore, the memory capacity used can be reduced. In addition, it is possible to prevent duplication of data by restarting reproducible random reproduction.

  In the present invention, the stop position (for example, time) may be stored when the reproduction of the data is stopped, and the reproduction may be started from the stop position when the data is resumed.

  As a result, the data immediately before the stop is not duplicated or lost and reproduced. Further, when viewed from the user, the reproduction can be resumed as if the pause was cancelled.

  As described above, according to the present invention, reproduction of random data can be performed with a simple operation so as not to overlap. Also, random data reproduction can be performed without duplication while reducing the memory capacity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing the appearance of a playback apparatus according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a left side view thereof.

  The playback device 1 shown in this figure is of a size called a handheld type like a PDA, for example, and can be viewed with a single hand while holding a video or still image, or placed in a pocket for music via headphones. You can listen to. Further, the playback device 1 functions as an external hard disk device viewed from the personal computer side when connected to the personal computer via a USB cable.

  As shown in FIG. 1, a display unit 2 made of a liquid crystal device having a size of about 3.5 inches, for example, is disposed on the front surface of the playback device 1. An operation panel 3 is provided on the right side of the display unit in the figure.

  The operation panel 3 includes a ← button 3a, a button 3b for performing operations such as switching of tabs on the title list screen, fast-forwarding of playback content on the content playback screen, and fast-rewinding, canceling operation and the previous screen. BACK button 3d used when stopping the playback of the file, executing item selection and function, ENTER button 3c used when playing / displaying the file, and moving the selection item up and down on the title list screen ↑ / ↓ buttons 3e used for sending are provided. These buttons have a built-in touch sensor that operates only by lightly touching them, and the surface of the button is recessed to prevent malfunction due to erroneous contact.

  As shown in FIG. 2, the upper surface of the playback device 1 has an operation state depending on the lighting pattern (for example, green lighting indicates that the power is on, orange lighting indicates that the built-in battery is being charged, and green blinking is built-in from the connected personal computer. While accessing the hard disk, blinking orange indicates that the capacity of the built-in battery is low.) The access lamp 4a can be confirmed. When turning off the power, press and hold on the "POWER" side for more than 1 second, and on the "HOLD" side Power switch 4b that can disable the operation buttons if set, -Volume button 4c, + volume button 4d for adjusting the volume during playback of a video file or music file, currently displayed screen A TOOLS button 4e for displaying a menu of operations (tools) that can be executed on the display unit 2 is provided.

  As shown in FIG. 3, a headphone connector 5a and an openable / closable cap 5b are provided on the left side surface of the playback apparatus 1. FIG. 4 shows a state in which the cap 5b is opened. In the portion where the cap 5b is opened, a DC IN connector 5c for connecting an AC adapter, a USB connector 5d for connecting a USB cable, and a video image to be played back by the playback device 1 are displayed on a TV or the like. An AV OUT connector 5e to which a cable is connected is provided.

  FIG. 5 is a block diagram showing a schematic configuration of the reproducing apparatus 1.

  In the figure, 6 has a storage capacity of about 20 GB, a hard disk for storing music data, video data, photo data, etc., 7 a USB interface unit, 8 controls the operation of each unit and functions as an MPEG decoder. CPU / DSP unit. The analog switch 9 is an analog switch for allowing only the hard disk 6 to be seen from the personal computer when the personal computer is connected to the USB connector 5d via the USB cable.

  A flash memory 10 and an SDRAM 11 are connected to the CPU / DSP unit 8. The display unit 2 is connected to the CPU / DSP unit 8, and a backlight 12 is provided on the back surface or side surface of the display unit 2. The power supply unit 13 supplies power to the display unit 2, the backlight 12, and the access lamp 4a.

  The CPU / DSP unit 8 is connected to an AV OUT connector 5e via a driver 14 for impedance matching of about 75Ω, and to a headphone connector 5a via a digital / analog converter 15.

  Reference numeral 16 denotes a sub-CPU of a battery backup type (power is supplied and operates when the power is turned off), and has a built-in battery backup type memory 16a. The sub CPU 16 performs management of the battery and the access lamp 4a associated therewith, management of the resume function, and the like. The sub CPU 16 is connected to a key unit 17 such as an operation button of the CPU / DSP unit 8 and the operation panel 3.

  Reference numeral 18 denotes a lithium ion battery, which is connected to the DC IN connector 5 c via the battery charging unit 19. The DC / DC converter 20 converts the DC power of the lithium ion battery 18 into a 3.3V or 1.5V DC power and supplies it to each part.

  Next, the relationship between the screen displayed on the display unit 1 and operation buttons will be described.

  In the reproducing apparatus 1, when the power switch 4b is turned on, the latest end state is reproduced based on the data stored in the sub CPU 16 (resume function).

  Assume that the title list screen of “Video” is displayed as shown in FIG. When the button 3b is pressed (touched) in this state, the “Music” title list screen shown in FIG. 7 is displayed. When the button → 3b is pressed further, the “Photo” title list screen shown in FIG. 8 is displayed. When the → button 3b is further pressed, a title list screen of “Setup” shown in FIG. 9 is displayed. When the ← button 3a is pressed, the title list screen is switched on the contrary. That is, by pressing the → button 3b, the title list screen is switched in the order of “Video”, “Music”, “Photo”, “Setup”, and by pressing the ← button 3a, the title list screen is “Setup”, It is switched in the order of “Photo”, “Music”, and “Video”.

  In the title list screen of “Music” shown in FIG. 7, the selected item can be sent in the vertical direction by sliding the up / down button 3e up or down, or touching the top or bottom. When the ENTER button 3c is pressed with a predetermined selection item, the selection item (in this case, a predetermined music file) is played back, and when the BACK button 3d is pressed, the playback of the file is stopped. Return to the list screen. The same applies to “Video” and “Photo”.

  Here, when “Play all” is selected on the title list screen of “Music” and the ENTER button 3c is pressed, all the music files are played in a predetermined order. At this time, if the TOOLS button 4e is pressed, reproduction settings such as “repeat” and “shuffle” can be set as shown in FIG. Here, when the “shuffle” mode is selected and the ENTER button 3c is pressed, “ON” and “OFF” are selected, and all music is played in a predetermined order according to the selection of “ON” and “OFF”. Switching between the mode to perform and the mode of “shuffle” is performed.

  Next, such a reproduction operation will be described in more detail based on the flowcharts shown in FIGS.

When the BACK button 3d is pressed from the “Music” title list screen shown in FIG. 7, it is possible to specify a song search method and a sort pattern. For example, artist-album-genre-age-playlist-title can be designated as the search method and sort pattern. For example, when “album” is selected, “play all” and album titles are displayed in alphabetical order.
(1) Here, when the user designates a song search method and a sort pattern (step 1101), a start song is designated by the user and an instruction to start performance is received (step 1102), a performance list is created (step 110). 1103). The performance list is created by searching for songs and sorting the song order.
(2) It is determined whether or not the resume mode is set (step 1104). The determination as to whether or not the resume mode is set is performed by using the same song search method and sort pattern ID stored in the memory 16a, which will be described later, as the previous song, and the same song as the previous song as the start song. Depending on whether specified or not.
(3) If the resume mode is not set, the performance is started from the 0th song in the performance list (step 1105).

And during the performance,
(A) Was shuffle mode (random playback mode) instructed during the performance? (Step 1106)
(B) Did the user stop during the performance? (Step 1107)
(C) Have you finished playing the song? (Step 1108)
(D) Did you play the performance list to the end? (Step 1109)
Judging.
(4) If the shuffle mode is instructed in the middle of the performance (n-th song) in step 1106, it is determined whether the mode has changed from the normal mode to the shuffle mode or the remaining all shuffle mode with the first song designation (step 1110). ).
(A) When transitioning from the normal mode to the shuffle mode, as shown in FIG. 15, the (n + 1) th music is shuffled to the last music as the shuffle start position (step 1111). At this time, the n music currently being played continues to be played.

  Here, the sub CPU 16 generates a random number for the shuffle mode, and generates a sequence of numerical values uniquely determined by the random number. This generation is performed by a random function, for example. This random function is also provided in, for example, a C language standard library. The reproduction in the shuffle mode is performed based on this numeric value sequence. Here, rseed is newly generated, and st_tr = n + 1 and tr0 = 0.

As a specific example of shuffle, for example, as shown in FIG. 16, assuming that the shuffle mode is set during the performance of the second song among the five songs, rseed = C value and rand = {4, 5, 3}, Assuming that tr0 = 0 and st_tr = 3, the data (3-5) are switched according to the order of the rand values for the music (3-5) to be shuffled. Since the first value of rand (first) is 4, it is replaced with 3 and 4 out of 3, 4 and 5, and since the next value of rand (second) is 5, 3 and 5 out of 4, 3, 5 are replaced. Since the next value (third) of rand is 3, the tune order is 3, 5 and 4 by exchanging 3 and 4 out of 4, 5, and 3.
(B) In the case of the remaining all shuffle mode with the start song designation, as shown in FIG. 17, first, the nth song and the 0th song are exchanged (step 1112), and the first song is the last song as the shuffle start position. Step 1113 is shuffled. Here, rseed is newly generated, and st_tr = 1 and tr0 = n.

Since the song being played is the 0th song, the currently playing song is the 0th song (track = 0) (step 1114).
(C) In any of the cases (a) and (b), the shuffle information (rseed, st_tr, tr0) is stored in the memory 16a for resumption (step 1115).
(5) When the user stops reproduction in step 1107, the memory 16a stores, as data for restoring the performance state, a value (track) indicating the performance song at the time of stoppage, a performance time at the time of performance stop, and a performance list. As the data for restoring, an ID that can determine the song search method and sort pattern is stored (step 1116).
(6) When the performance of one song is completed in step 1108, it is determined in step 1109 whether it is the last song, and if it is not the last song, the performance of the next song is started with track = track + 1 ( Step 1117).
(7) If it is determined in step 1109 that the song that has been played is the last song, it is determined whether or not the repeat mode is set (step 1118).

If the repeat mode is not set, the process of step 1116 is performed. In this case, the value (track) indicating the performance music at the time of stop and the performance time at the time of stop of the performance are each 0.
(8) If it is determined in step 1118 that the repeat mode is set, it is first determined whether or not the shuffle mode is set (step 1119).

  If it is set to the shuffle mode, all songs are shuffled from the 0th song to the last song in the performance list (step 1120). Here, rseed is newly generated, and st_tr = 0 and tr0 = 0.

  Then, the shuffle information (rseed, st_tr, tr0) is stored in the memory 16a for resumption (step 1121). Returning to step 1105, playback starts from the 0th track.

On the other hand, if it is determined in step 1119 that the shuffle mode is not set,
Returning to step 1105, playback starts from the 0th track.
(9) If it is determined in step 1104 that the resume mode is set, it is first determined whether or not the shuffle mode is set (step 1122).
(A) When the shuffle mode is set, the shuffle information (tr0) is read from the memory 16a and exchanged with the first song (0th) in the performance list (step 1123).

Next, shuffle information (rseed and st_tr) is read from the memory 16a, and shuffled from the st_tr-th song to the last song in the performance list using the rand generated based on the rseed (step 1124).
(B) When the shuffle mode is not set or after step 1124, the value (track) indicating the performance music at the time of stop is read from the memory 16a (step 1125), and the performance time when the performance is stopped is read The performance is started from (Step 1126). Then, the process returns to step 1106.

  As described above, in the present embodiment, a search is performed using the same search condition as the previous time, and the list is arranged using the same sort rule as the previous time, and the three pieces of shuffle information (rsed, st_tr, tr0) stored last time are used. By shuffling according to the above procedure, the same performance order list as before can be created. Therefore, if the performance is started from the stored performance time of the stored track number, the pause is canceled as if all the continuations were stopped when the previous performance was stopped. , Playback can be resumed. Further, since it is not necessary to store the previous rand data, the amount of memory used can be made very small.

  In addition, this invention is not limited to said embodiment.

  In the above embodiment, music data has been described as an example. However, it is of course possible to use video data, photo data, or other data.

  In the above embodiment, the case where the normal mode playback is switched to the shuffle mode has been described as an example. However, the present invention can also be applied to a case where the shuffle mode is reset again during the shuffle mode.

It is a front view which shows the external appearance of the reproducing | regenerating apparatus which concerns on one Embodiment of this invention. It is a top view of the reproducing | regenerating apparatus shown in FIG. It is a left view of the reproducing | regenerating apparatus shown in FIG. It is a figure which shows the state which opened the side surface of FIG. It is a block diagram which shows schematic structure of the reproducing | regenerating apparatus shown in FIG. 3 is a title list screen of “Video” displayed on the display unit of the playback apparatus shown in FIG. FIG. 3 is a diagram showing a “Music” title list screen displayed on the display unit of the playback apparatus shown in FIG. 1. FIG. 3 is a diagram showing a “Photo” title list screen displayed on the display unit of the playback apparatus shown in FIG. 1. FIG. 3 is a diagram showing a title list screen of “Setup” displayed on the display unit of the playback apparatus shown in FIG. 1. FIG. 3 is a diagram showing a screen when a TOOLS button is pressed on the “Music” title list screen displayed on the display unit of the playback apparatus shown in FIG. 1. FIG. 3 is a flowchart for explaining a reproducing operation in the reproducing apparatus shown in FIG. 1 (No. 1). 6 is a flowchart for explaining a reproduction operation in the reproduction apparatus shown in FIG. 1 (No. 2). FIG. 7 is a flowchart for explaining a reproducing operation in the reproducing apparatus shown in FIG. 1 (No. 3). FIG. 6 is a flowchart for explaining a reproducing operation in the reproducing apparatus shown in FIG. 1 (No. 4). It is explanatory drawing at the time of changing from normal mode to shuffle mode. It is a figure for demonstrating the specific example of a shuffle. It is a figure for demonstrating the remaining all shuffle modes with a head music designation | designated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Playback apparatus 2 Display part 3 Operation panel 3a ← button 3b → button 3c ENTER button 3d BACK button 3e ↑ / ↓ button 4e TOOLS button 6 Hard disk 8 CPU / DSP part 16 Sub CPU
16a memory

Claims (2)

Continuous reproduction means for continuously reproducing one or more data stored in the first storage unit in the first reproduction order;
When switching to the mode for shuffle playback is instructed during the playback of the one or more data by the continuous playback means, the playback of the data being played back is continued, while a random number is generated, A sequence of numerical values is generated using a function, and the order of the n + 1th and subsequent data is calculated using the numerical sequence and the value of n + 1 where n is the order of the data being reproduced in the first reproduction order. A second reproduction order in which the second reproduction order is changed, and after the reproduction of the nth data is finished, the shuffle reproduction means for continuously reproducing the n + 1st and subsequent data in the second reproduction order;
A second storage unit for storing the random number and the n + 1 value;
When playback stop is instructed during playback of the data by the shuffle playback means, information for specifying the data for which playback stop is instructed in the first storage unit, and the position when playback of the data is stopped And a third storage unit for storing the information of
When the resumption of data reproduction is instructed, the shuffle reproduction means resumes the reproduction of the data instructed to stop the reproduction from the position at the time of the reproduction stop based on the information stored in the third storage unit Then, the second reproduction order of the (n + 1) th and subsequent data is regenerated based on the information stored in the second storage unit, and the reproduction stop is instructed in the second reproduction order. Play subsequent data continuously
A reproducing apparatus characterized by that. Continuously reproducing one or more data stored in the first storage unit in a first reproduction order;
When switching to the mode for shuffle playback is instructed during playback of the one or more data, the playback of the data being played continues while generating a random number, and using this random number and a predetermined function, a numerical value is generated. A second column in which the order of the (n + 1) th and subsequent data is changed by using this numerical column and the value of n + 1, where n is the order of the data being reproduced in the first reproduction order and n is the value. Generates the playback order of
Storing the random number and the value of n + 1 in a second storage unit;
After the reproduction of the nth data is finished, the n + 1st and subsequent data are continuously reproduced in the second reproduction order,
When playback stop is instructed during playback of the data in the second playback order, information for specifying the data for which playback stop is instructed in the first storage unit, and playback stop of the data The time position is stored in the third storage unit,
When the resumption of the data reproduction instructed to stop the reproduction is instructed, the information for specifying the data instructed to stop the reproduction stored in the third storage unit and the position when the reproduction of the data is stopped Based on the above, the reproduction of the data instructed to stop the reproduction is resumed from the position where the reproduction was stopped,
Regenerating the second reproduction order of the (n + 1) th and subsequent data based on the random number and the n + 1 value stored in the second storage unit;
A reproduction method comprising: continuously reproducing data after the data instructed to stop reproduction in the second reproduction order .

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