JP2007167472A - Reproducing machine and reproducing method of audio signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce music to which a walking tempo does not respond when walking. <P>SOLUTION: A reproducing machine has a storage 121 for storing digital audio data of the music, a reproducing circuit 122 for reproducing the digital audio data, and a detecting means 130 for detecting the walking tempo of a user. The walking tempos detected by the detecting means 130 is classified to a plurality of groups according to the appearing frequency of the same, and the groups few in the appearing frequency of the walking tempos are sorted to other groups. A control circuit 110 determines in which of the plurality of groups the walking tempo detected by the detecting means 130 is contained, selects the play list corresponding to the relevant group according to the determining result, and takes out the digital audio data of the music registered in the selected play list from the storage 121 and supplies the same to the reproducing circuit 122. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an audio signal player and a reproducing method.

  In recent years, an increasing number of people are engaged in walking / running such as walking, jogging or running for the purpose of health maintenance, health promotion, dieting, etc. due to heightened health awareness. In order to obtain a certain effect by this walking / running, it is necessary to continue walking / running for a certain amount of time (in the following, for the sake of simplicity, exercises such as walking, jogging, and running are generically referred to as Called "walking").

  Therefore, an audio player that supports walking has been proposed. The audio player is of a type that can be carried when a pedestrian (user) walks, and stores music of various tempos. Then, during walking, the walking tempo is detected, and a music piece having a tempo corresponding to the detected walking tempo is selected to be heard by a pedestrian. The walking tempo is the number of steps per unit time, for example, per minute, and the tempo of the music is the number of beats per minute.

  For example, when walking with a walking tempo of 120 bpm, a song with a tempo of 120 bpm (this is generally a march) is played. According to such an audio player, the pedestrian can walk on the rhythm according to the tempo of the music, and can continue walking happily.

For example, there are the following prior art documents.
Japanese Patent Laying-Open No. 2005-156641

  By the way, as will be described in detail later, when walking was analyzed in daily life, it was found that walking with an average walking tempo of 140 to 160 bpm hardly appeared (hereinafter, the range 140 in which this walking tempo does not appear). ~ 160bpm is called "blank range").

  And if a blank range is generated in the walking tempo in this way, even if music of various tempos is stored in the audio player, music with a tempo that matches the walking tempo of the blank range is selected when walking. You will not be able to listen.

  The present invention is intended to solve such problems.

In this invention,
Storage to store the digital audio data of the song,
A reproduction circuit for reproducing the digital audio data;
Detecting means for detecting a user's exercise tempo;
A control circuit for extracting the digital audio data from the storage and supplying the digital audio data to the reproduction circuit;
When classifying the tempo of the exercise detected by the detection means into a plurality of groups according to the appearance frequency of the tempo of the exercise, and allocating a group with a low appearance frequency of the exercise tempo to other groups, A playlist in which music of a tempo corresponding to the tempo of exercise included in the group is registered,
The control circuit is
It is determined which of the plurality of groups the tempo of the exercise detected by the detection means is included,
While selecting a playlist corresponding to the group as a result of the discrimination among the plurality of playlists,
The digital audio data of the music registered in the selected playlist is taken out from the storage and supplied to the playback circuit as an audio signal playback machine.

  According to the present invention, the current exercise tempo is included in which group when the exercise tempo is grouped according to the appearance frequency, and the music selection is performed based on the determination result. Even when the player is slow or fast, it is possible to play an appropriate piece of music, and the user can feel the comfort that the player selects music according to his / her own.

  In addition, the user does not need to make fine settings and adjustments, and is less susceptible to the user's physical condition, individual differences, or fluctuation of the walking itself. Furthermore, since the play list is formed by correcting the exercise tempo with a low frequency of appearance, it is possible to play music with a tempo corresponding to the exercise tempo with a low frequency of appearance when walking.

[1] Analysis of walking patterns
14 subjects (8 adult boys and 6 adult girls) were analyzed for walking in daily life. As shown in Fig. 1, the walking was divided into four groups, "low speed walking" and "normal walking". , "Jogging" and "running" can be roughly divided. That is, walking in daily life is included in any of these “low-speed walking” to “running”.

  Further, when the walking tempo of the subject was measured for these four groups, the results shown in FIG. 2 could be obtained. Here, the horizontal axis of FIG. 2 indicates the walking tempo (average walking tempo for several seconds), and the vertical axis indicates the frequency (number of people). In FIG. 2 and the subsequent figures, when the horizontal axis of the graph is the walking tempo, the walking tempo is rounded in units of 10 bpm, that is, divided by 10 bpm, and the horizontal axis is similarly shown.

  According to this measurement result, it can be seen that the walking tempo in daily life is not uniformly distributed and is included in any group. It can also be seen that the walking tempo ranges below 80 bpm, 140-160 bpm, and 230 bpm and above rarely appear in daily life. The range 140 to 160 bpm where the walking tempo does not appear is the above-mentioned “blank range”.

  This blank range is thought to be because humans automatically select a state in which transportation energy consumption is efficient and walk. The walking tempo in the blank range is a tempo located between walking and jogging, and is a so-called “racewalking” state. However, in daily life, there is almost no walking in a state like a racewalk. Therefore, as in the above measurement result, it is considered that the walking tempo included in the blank range usually hardly appears.

  And if a blank range is generated in the walking tempo in this way, as described above, even if music of various tempos is stored in the audio player, the music of the tempo corresponding to the walking tempo of the blank range is stored. Will not be selected.

  FIG. 3 shows the result of measuring the relationship between the walking tempo and the appearance frequency of a subject. According to this measurement result, the walking tempo of the subject can be roughly divided into the above four groups. In addition, there is variation in walking tempo in each group. There is also a blank range. However, an average value, a standard deviation, and a coefficient of variation can be obtained for each group, and the range can be estimated.

[2] Summary of the Invention In the present invention, when music is played back to support walking, the playback is executed as follows based on the matter of [1]. That is,
(1) When learning, group the walking tempo according to the frequency of appearance.
(2) Prepare a playlist of songs for each group in (1).
(3) During playback (walking), a playlist including the current walking tempo is selected in real time from the playlists in section (2).
(4) Play the music selected in (3) and prepared in the playlist.
(5) Allocate music corresponding to the blank range to other playlists.

[3] First embodiment [3-1] Learning of walking tempo In FIG. 4, reference numeral 100 denotes a playback device according to the present invention, and a user (pedestrian) walks with the playback device 100 during learning. . During this walking, the playback device 100 measures an instantaneous walking tempo MT (t) every several milliseconds to several seconds, and from the measured walking tempo MT (t), an average walking tempo m_MT ( t) is calculated. In FIG. 4, the playback device 100 measures the walking tempo MT (t) every second, and calculates the average walking tempo m_MT (t) every 5 seconds from the measurement result.

  The calculated walking tempo m_MT (t) is stored in the storage of the playback device 100 together with the time information. Thus, the playback device 100 learns the user's walking tempo.

  When the walking tempo is learned, the playback device 100 is connected to the personal computer 20 as shown in FIG. 5, and the walking tempo m_MT (t) and time information stored in the playback device 100 are transferred to the personal computer 20.

  In this case, when the past walking tempo m_MT (t) and time information are stored in the personal computer 20, the newly transferred walking tempo m_MT (t) and time information are stored in the stored walking tempo m_MT (t). And the time information may be overwritten or merged.

[3-2] Grouping of walking tempos In the personal computer 20, a histogram is generated for the number of appearances of the walking tempo m_MT (t) from the transferred walking tempo m_MT (t) and time information, and the maximum value is obtained from the histogram. Is detected and the walking tempo is grouped.

  FIG. 6 shows an example of a histogram created from the walking tempo m_MT (t), the horizontal axis shows the walking tempo m_MT (t), and the vertical axis shows the number of appearances. Then, in this histogram, the local maximum value is detected, and the local maximum values are sequentially set as local maximum values MD (1) max, MD (2) max,..., MD (k) max in the horizontal axis direction. In FIG. 6, k = 5.

  Then, the walking tempo distributions having the maximal values MD (1) max to MD (k) max as vertices are classified into groups MD (1) to MD (k). Subsequently, in each of the groups MD (1) to MD (k), a lower limit value MD (n) lower and an upper limit value MD (n) upper (n = 1 to k) of the walking tempo m_MT (t) are obtained. In FIG. 6, lower limit values MD (1) lower to MD (5) lower and upper limit values MD (1) upper to MD (5) upper are obtained.

  In this case, when the group MD (n) does not overlap with other groups, pay attention to both ends of the group MD (n), and set the value on the horizontal axis where the number of appearances is 0 to the lower limit MD (n) lower or upper limit. Let the value MD (n) upper. When two groups MD (n-1) and MD (n) overlap, the maximum value MD (n-1) max of the overlapping group MD (n-1) and the group MD ( The median of the maximum value MD (n) max of n) is set as the upper limit value MD (n-1) upper of the group MD (n-1) and the lower limit value MD (n) lower of the group MD (n).

  Further, when the local maximum value is located at the upper end or the lower end of the histogram as in the local maximum value MD (5) max and the group MD (5) in FIG. 6, the local maximum value and the group are ignored.

  When the group MD (n) is reorganized according to the above, in the case of FIG. 6, as shown in FIG. 7A, four sets of lower limit value MD (1) lower and upper limit value MD (n) upper to lower limit value MD (4) Lower and upper limit MD (4) upper can be obtained.

  Therefore, as shown in FIG. 8, thereafter, these four sets of lower limit value MD (n) lower and upper limit value MD (n) upper are used as the new lower limit value and upper limit value of the walking tempo group MD (n). And At this time, groups MD (1) to MD (4) correspond to “low-speed walking” to “running” of the corresponding pedestrian.

  7B and 8, when the walking tempo m_MT (t) is 80 bpm or less (too slow), 140 to 160 bpm (blank range) and 210 bpm or more (too fast), Group MD (5), MD (6) and MD (7). As shown in the rightmost column of FIG. 7 and FIG. 8, the set of the lower limit value MD (n) lower and the upper limit value MD (n) upper is hereinafter referred to as “walking status MS (n)”.

[3-3] Correction of walking status In order to deal with the blank range, in the example of [3], the walking status MS (n) is corrected as shown in FIG.

  That is, among the group MD (n), the group MD (6) in the blank range is divided into the walking tempo range of 140 to 150 bpm and the range of 150 to 160 bpm, and one range 140 to 150 bpm is divided into the group MD ( Combined with 2), the range indicated by walking status MS (2) is 120-150 bpm, and the other range 150-160 bpm is combined with group MD (3) and the range indicated by walking status MS (3) is 150-180 bpm And

  FIG. 10 illustrates the correction method in this case by way of illustration. That is, FIG. 10A shows the relationship between the walking step and the group MD (n) in FIG. 8 and illustrates the walking status MS (n) before correction shown in FIG.

  FIG. 10B shows the group MD (n) after the correction by [3], and the upper limit value MD (2) upper of the group MD (2) is expanded to the center of the original group MD (6). At the same time, the lower limit MD (3) lower of the group MD (3) is expanded to the center of the original group MD (6).

  When the above correction processing is completed, the corrected walking statuses MS (1) to MS (7) shown in FIG.

[3-4] Creation of playlist and registration of music piece The playback device 100 uses, for example, the playlist shown in FIG. 10C from the walking status MS (1) to MS (7) transferred from the personal computer 20, as shown in FIG. Framework) Create PL (1) to PL (7). The playlists PL (1) to PL (7) are those in which music is classified and registered according to the tempo, and the range of tempos that each plays is determined by the walking status MS (1) to MS (7). The range is shown.

  Then, as shown in FIG. 11, when the tempo of an arbitrary song is included in the tempo of the playlist PL (j) (j = 1-7), the digital audio data of that song is Registered in the list PL (j).

  In FIG. 11, when a music piece is registered in the playlist PL (j), it is registered by the file name of the digital audio data of the music piece. That is, songs in the tempo in the range indicated by the walking status MS (5) are registered in the playlist PL (5) with their file names E1 to Ee,..., The walking status MS is stored in the playlist PL (7). This is a case where music pieces having a tempo in the range indicated by (7) are registered with the file names G1 to Gg.

[3-5] Music Playback When the playback device 100 is used during walking and playback of music is instructed, the walking tempo m_MT (t) at this time is detected. The corrected walking statuses MS (1) to MS (7) in FIG. 9 are referred to by the detected current walking tempo m_MT (t), and the current walking tempo m_MT (t) is determined as the walking status MS (1 ) To MS (7) are determined, and the determination result is a value C (t).

  For example, when the walking tempo m_MT (t) changes as shown in the second column of FIG. 12, the walking tempo m_MT (t) is included in the walking status MS (t) shown in the third column. C (t) is as shown in the fourth column.

  Then, as shown in the fifth column of FIG. 12, the playlist PL (C (t)) is selected from the playlists PL (1) to PL (7) by the discriminant value C (t), and this playlist is selected. Select and play music included in PL (C (t)) (except for the third line).

However, in steady state, that is, during playback of music, the current walking status MS (C (t)) is compared with the previous walking status MS (C (t-1))
(A) When there is a difference between the two and the song being played at that time has already been played for a predetermined time
(B) Other than item (A) above
It is determined whether it is.

  In the case of item (B) (for example, the first to third lines in FIG. 12), the music being reproduced at that time is continuously reproduced. When the music being played ends, the music included in the current playlist PL (C (t)) is selected again and the music is played.

  However, when the item (A) is reached (for example, the fourth line in FIG. 12), the playlist PL (C (t)) is selected based on the discriminant value C (t) at the time when the item (A) is reached. Then, the music included in this playlist PL (C (t)) is selected and reproduced. Therefore, the music played back from this point in time and its tempo are changed corresponding to the walking tempo m_MT (t), and the playback is continued thereafter.

  In this way, the playback device 100 plays back a song with a tempo that matches the walking tempo m_MT (t). At this time, by learning the walking tempo, for example, the walking status MS (n) as shown in FIG. 9 is obtained, and the tempo of the reproduced music is included in the range of the walking status MS (n). Therefore, the music to be played can be appropriately changed even when the walking tempo is slow or fast.

  In addition, since the walking status MS (n) is obtained through learning, it is not necessary for the user (pedestrian) to make detailed settings or adjustments, and is affected by the physical condition of the user, individual differences, or fluctuations in the walking itself. Hateful.

  Further, for example, as shown in FIG. 10, the blank range of the walking status MS (6) is corrected, and the playlist PL (n) is created from the corrected walking status MS (n). You can select and play music that corresponds to the range.

[3-6] Configuration Example of the Playback Device 100 FIG. 13 shows an example of the circuit configuration of the playback device 100 for audio signals according to the present invention. The playback device 100 can be used as a walking support device and can also be used as a general portable player. Although not shown, the playback device 100 is configured in a size and shape that can be carried in a pocket or the like when walking. ing.

  The regenerator 100 has a system control circuit 110 constituted by a microcomputer. The control circuit 110 includes a CPU 111 that executes programs, a ROM 112 in which various programs are written, a work range RAM 113, and a nonvolatile memory 114, and these memories 112 to 114 are connected via a system bus 119. It is connected to the CPU 111.

  In this case, the ROM 112 is provided with a program for the CPU 111 to execute the various processes described above. The non-volatile memory 114 is for storing various information about the player 100 and the user, and is constituted by a flash memory, for example.

  Further, the player 100 has a storage 121. The storage 121 stores or saves various music data (musical digital audio data) reproduced as music. For this reason, the storage 121 is configured by a large-capacity flash memory or a small hard disk device. Note that the music data stored in the storage 121 is digital audio data that is compressed by, for example, the MP3 method.

  The storage 121 is connected to the system bus 119 and is provided with a reproduction circuit 122, which is also connected to the system bus 119. The reproduction circuit 122 includes a decoder circuit that decompresses the compressed music data to the original digital audio data, a D / A converter circuit that D / A converts the digital audio data into an analog audio signal, It consists of an output amplifier.

  Then, when the music data is extracted from the storage 121 and supplied, the playback circuit 122 decompresses the data and performs D / A conversion, and outputs the analog audio signal to the headphone jack 123. The headphone 10 is connected to the jack 123.

  An interface circuit 124 is connected to the system bus 119, and music data from the external personal computer 20 is taken into the control circuit 110 through the input connector 125 and the interface circuit 124 and stored in the storage 121.

  Furthermore, when the user walks with the player 100, a detecting means 130 for detecting the walking tempo is provided. In this example, the detection unit 130 includes a three-dimensional acceleration sensor 131 and an analysis circuit 132 that analyzes the sensor output. Then, the motion of the user's body is detected by the acceleration sensor 131, and the analysis circuit 132 performs spectrum analysis and autocorrelation calculation on the detected output, thereby detecting the walking tempo from the acceleration peak interval. This walking tempo detection output is taken into the control circuit 110 through the system bus 119.

  Various operation keys 141 are connected to the system bus 119, and a display device such as an LCD 143 is connected to the system bus 119 through a display control circuit 142. In this case, the operation key 141 is used to select whether to operate the player 100 as a portable player or a walking support device, to select an operation mode in each operation, to select music, and to make various settings. The LCD 143 is for displaying the operation result of the operation key 141, information on the music being reproduced, and the like.

[3-7] Operation [3-7-1] Storage of Music The music data of the music to be stored in the playback device 100 is compressed in advance and prepared in the personal computer 20. Then, the personal computer 20 is connected to the player 100, and the personal computer 20 executes a predetermined transfer program to instruct the transfer of music data. Then, the music data prepared in the personal computer 20 is supplied to the playback device 100 through the connector 125. In the playback device 100, the supplied music data is taken in by the CPU 21 through the interface circuit 124 and stored. 121 is stored.

[3-7-2] Learning of walking tempo To learn the walking tempo, the playback device 100 is set to the learning mode, and the user (pedestrian) walks with the playback device 100. Then, during this walking, the processing described in [3-1] is executed, and for example, the walking tempo m_MT (t) and time information as shown in FIG. Thus, the user's walking tempo is learned.

  When the walking tempo is learned, the personal computer 20 is connected to the playback device 100, and the walking tempo m_MT (t) and time information stored in the memory 114 are transferred to the personal computer 20.

[3-7-3] Generation of walking status MS (1) to MS (7) In the personal computer 20, as described in [3-2], the transferred walking tempo m_MT (t) and time information are stored. For example, corrected walking statuses MS (1) to MS (7) shown in FIG. 9 are generated, and the walking statuses MS (1) to MS (7) are transferred to the playback device 100. The walking statuses MS (1) to MS (7) are stored in the memory 114 in the playback device 100.

[3-7-4] Creation of playlists PL (1) to PL (7) When the player 100 is instructed to create a playlist, the walking statuses MS (1) to (3) stored in [3-7-3] are stored. The range of the walking tempo that the playlists PL (1) to PL (7) handle according to MS (7) is set as shown in FIG. 10C.

  Subsequently, the tempo of the music stored in the storage 121 is analyzed by [3-7-1], and as shown in FIG. 11, the file name of the music is changed to the playlist PL (1) according to the analyzed tempo. It is registered in the corresponding playlist of ~ PL (7).

  The tempo of the music can be obtained by performing a spectrum analysis of the music data and obtaining an autocorrelation function. Also, when music data is prepared in the personal computer 20, information indicating the music tempo can be added to the music data as meta information.

[3-7-5] Playing music as a general portable player In this case, when the play of music is instructed, the music data stored in the storage 121 is read, and the read music data is The data is supplied to the reproduction circuit 122 and subjected to data expansion and D / A conversion.

  Accordingly, an analog audio signal of the read music data is output from the reproduction circuit 122, and this signal is supplied to the headphones 10. As a result, the user can listen to the music through the headphones 10. At this time, the name of the song being played is displayed on the LCD 143.

  At this time, music data is read from the storage 121 according to a preset playback mode, and playback of only one song, continuous playback of all songs, playback in a random order, repeat playback, and the like are executed. Thus, the playback device 100 can be used as a general portable player.

  When the playlists PL (1) to PL (7) are designated, only the music registered in the designated playlist is selected and reproduced. For example, by specifying the playlist PL (7), uptempo music is played.

[3-7-6] Reproduction of music as walking support device In this case, as described in [3-5], music having a tempo corresponding to the walking tempo is reproduced. In other words, in the playback device 100, when playback is instructed, the walking means tempo m_MT (t) is detected by the detecting means 130, and the detected walking tempo m_MT (t) is stored in [3-7-3] as a memory. The walking statuses MS (1) to MS (7) stored in 114 are referred to. Thus, the current walking tempo m_MT (t) is converted to the value C (t).

  Then, among the playlists PL1 (1) to PL (7), the playlist PL (C (t)) indicated by the value C (t) is selected, and the selected playlist PL (C (t)) ) Is selected from the storage 121, the music data having the selected file name is read from the storage 121, and the read music data is supplied to the reproduction circuit 122 for data expansion and D / A conversion. Is done. Therefore, as in [3-7-5], the music stored in the player 100 can be listened to by the headphones 10.

  In addition, during a steady state, that is, during walking, the current walking status MS (C (t)) is compared with the previous walking status MS (C (t-1)), and the above item (A). Alternatively, the music is played back corresponding to the item (B).

  And also in this case, when selecting the next song, among the playlists PL1 (1) to PL (7), the playlist PL (C (t)) indicated by the value C (t) is selected, The file name of the music data is selected from the selected playlist PL (C (t)), the music data of the selected file name is read from the storage 121, and the read music data is reproduced by the reproduction circuit. 122.

  Thus, during walking, music with a tempo corresponding to the walking tempo m_MT (t) is reproduced. At this time, since the music having the tempo corresponding to the walking tempo in the blank range is registered in the playlist PL (2) or PL (3), the music can be listened to.

[3-7-7] Summary According to the playback device 100 described above, by learning the walking tempo m_MT (t) in advance, for example, playlists PL (1) to PL (1) for each walking tempo as shown in FIG. 7) and the current walking tempo m_MT (t) is determined to which of the playlists PL (1) to PL (7) corresponds to the playlist PL based on the determination result value CT (t). (1) to PL (7) is selected to play the music.

  Therefore, the reproduced music is automatically changed to an appropriate one regardless of whether the walking tempo is slow or fast. Therefore, the user (pedestrian) can feel the comfort that the player 100 selects music according to him / her.

  In addition, since the walking status MS (n) is obtained through learning, it is not necessary for the user (pedestrian) to make detailed settings or adjustments, and is affected by the physical condition of the user, individual differences, or fluctuations in the walking itself. Hateful.

  Further, for example, as shown in FIG. 9, the walking status MS (n) corrects the blank range and forms the playlist PL (n) as shown in FIG. 10B. But you can select and play songs.

[4] Second Example In this example, as shown in FIG. 14, the music included in the blank range group MD (6) is included in the playlist PL (1). That is, FIG. 14A is the same as FIG. 10A and shows the group MD (n) before correction and its walking tempo.

  In the example [4], the uncorrected walking status MS (n) shown in FIG. In addition, in the player 100, as shown in FIG. 14B, a playlist PL (n) corresponding to the walking status MS (n) is created. However, it is not necessary to create the blank range playlist PL (6).

  Then, when the music is registered in the playlist PL (n), as shown in FIGS. 14B and 14C, the walking status MD (5), MD (1), MD (2), MD (3), MD (4) , MD (7) music that contains tempo is registered in the corresponding playlist PL (5), PL (1), PL (2), PL (3), PL (4), PL (7) . However, the music included in the walking status MD (6) in the blank range is registered in the playlist PL (1) instead of the corresponding playlist PL (6).

  Therefore, during playback, when the walking tempo m_MT (t) reaches the tempo included in the walking status MS (1), the playlist PL (1) is selected, so the walking status MS (1) or walking in the blank range is selected. The music of the tempo included in the status MS (6) is selected and played. In other words, it is possible to play a tempo music included in the blank range walking status MS (6).

  In this case, since the tempo of the music and the walking tempo are multiples or close to each other, it is possible to walk on the rhythm of the music.

[5] Third Example In this example, as shown in FIG. 15, the music included in the blank range group MD (6) is included in the playlist PL (2) or PL (3). . That is, FIG. 15A is the same as FIG. 10A and shows the group MD (n) before correction and its walking tempo.

  In the example [5], the uncorrected walking status MS (n) shown in FIG. Further, in the player 100, as shown in FIG. 15B, a playlist PL (n) corresponding to the walking status MS (n) is created. However, it is not necessary to create the blank range playlist PL (6).

  Then, when registering a song in the playlist PL (n), as shown in FIGS. 15B and 15C, the walking status MD (5), MD (1), MD (2), MD (3), MD (4) , MD (7) music that contains tempo is registered in the corresponding playlist PL (5), PL (1), PL (2), PL (3), PL (4), PL (7) .

  However, when the tempo of the music is included in the first range 140 to 150 bpm of the walking status MS (6), as shown in FIGS. 15B and 15C, the music is registered in the playlist PL (2) and shown in FIG. 15D. As shown, this registered music is also registered in the table TBL2.

  In addition, when registering a song in the playlist PL (n), if the tempo of the song is included in the second half range 150 to 160 bpm of the walking status MS (6), as shown in FIGS. While registering in the playlist PL (3), as shown in FIG. 15D, the registered music is also registered in the table TBL3. When music is registered in the tables TBL2 and TBL3, the registration can be performed by the file name of the music data.

  Similarly to the example [3], the playlist PL (n) is selected according to the walking tempo m_MT (t), and the music is selected from the selected playlist PL (n) and reproduced. However, in this case, when the music to be played is included in the table TBL2, the tempo of the music played at a lower speed when reading the music data from the storage 121 is included in the range of the walking status MS (2). Correct the tempo as follows. When the music to be played is included in the table TBL3, the tempo of the music to be played at a higher speed when reading the music data from the storage 121 is included in the range of the walking status MS (2). Correct.

  Therefore, also in this example, at the time of walking, the music of the tempo included in the walking status MS (6) in the blank range can be reproduced.

[6] Others In the above description, when the walking status MS (n) is generated from the walking tempo m_MT (t) and the time information, the generation is executed by the personal computer 20, but it can also be generated by the control circuit 110. . The personal computer 20 can also create playlists PL (1) to PL (7) and transfer them to the playback device 100 together with the digital audio data of the music.

  Furthermore, in the above, the music of the tempo included in the walking status MS (5), MS (7) can also be distributed to playlists corresponding to other walking statuses as in the case of the walking status MS (6). . Also, a standard walking status is prepared in advance in the playback device 100, and each time the user executes walking, the standard walking status prepared according to the walking tempo is corrected or adjusted to a value suitable for the user. You can also go. By doing so, the more the player 100 is used, the more music can be selected that matches the user's walking pattern.

  In the above description, walking in daily life is classified as shown in FIG. 1. In addition to this daily life mode, a race mode, jogging mode, etc. are prepared and these modes are selected. It can also be possible. For example, in the jogging mode, as shown in FIG. 16, it can be configured with four walking statuses of low-speed walking, normal walking, light jogging, and jogging. Alternatively, a fast walking tempo can be provided between normal walking and jogging. Then, for each walking tempo, a walking status and a playlist can be prepared as described above, and music selection can be performed.

  In addition, when jogging is performed at an ideal tempo, a song that matches the tempo is selected, and when it is slightly faster or slower than the ideal tempo, it is slower or faster than the ideal tempo. You can also select songs with tempo so that jogging takes you to the ideal tempo.

  It is also possible to automatically select a song by setting an ideal tempo for the elapsed time of jogging. It is also possible to check the running tempo history after jogging. Furthermore, when the music to be played is changed, the change can be evaluated by operating the operation keys 141, and more appropriate music selection can be performed. Further, the user of the playback device 100 can create a switching condition suitable for himself or the user can set / change the lower limit value MD (n) lower and the upper limit value MD (n) upper himself / herself by looking at the histogram of FIG. You may do it.

  Further, the acceleration sensor 131 may be separated from the playback device 100 and may be attached to the headphones 10, for example. In this case, the detection signal may be supplied to the analysis circuit 132 by wire or wirelessly. Further, instead of the acceleration sensor 131, a speed sensor, a pedometer, a gyro, a GPS, or the like can be used. Furthermore, if the detecting means 130 can detect the walking tempo of the user, the detecting means 130 is carried in, for example, a pocket of clothes worn by the user or a bag carried in addition to what is worn on the user's body. It may be.

  Further, the music data may be integrated with video digital data. Furthermore, in the above, it is a case where walking is supported for walking in daily life, but for the exercises such as racewalking, jogging, cycling, aerobics, etc., an exercise status similar to the walking status is created and the exercise is supported. It can be a regenerator.

[List of abbreviations]
bpm: beats per minute
CPU: Central Processing Unit
D / A: Digital to Analog
LCD: Liquid Crystal Display
MP3: MPEG-1 / Audio Layer 3
MPEG: Motion Picture Experts Group
RAM: Random Access Memory
ROM: Read Only Memory

It is a graph for demonstrating this invention. It is a graph for demonstrating this invention. It is a graph for demonstrating this invention. It is a diagram for explaining the present invention. It is a table | surface figure for demonstrating this invention. It is a graph for demonstrating this invention. It is a table | surface figure for demonstrating this invention. It is a diagram for explaining the present invention. It is a table | surface for demonstrating one form of this invention. It is a diagram for explaining one form of this invention. It is a table | surface figure for demonstrating this invention. It is a table | surface figure for demonstrating this invention. It is a systematic diagram showing one embodiment of the present invention. It is a diagram for demonstrating the other form of this invention. It is a diagram for demonstrating the other form of this invention. It is a diagram for demonstrating the other form of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Headphone, 20 ... Personal computer, 100 ... Audio player, 110 ... Control circuit, 121 ... Storage, 122 ... Playback circuit, 130 ... Detection means, 13 ... Accelerometer, 132 ... Analysis circuit, 143 ... LCD

Claims (5)

Storage to store the digital audio data of the song,
A reproduction circuit for reproducing the digital audio data;
Detecting means for detecting a user's exercise tempo;
A control circuit for extracting the digital audio data from the storage and supplying the digital audio data to the reproduction circuit;
When classifying the tempo of the exercise detected by the detection means into a plurality of groups according to the appearance frequency of the tempo of the exercise, and allocating a group with a low appearance frequency of the exercise tempo to other groups, A playlist in which music of a tempo corresponding to the tempo of exercise included in the group is registered,
The control circuit is
It is determined which of the plurality of groups the tempo of the exercise detected by the detection means is included,
While selecting a playlist corresponding to the group as a result of the discrimination among the plurality of playlists,
An audio signal player that takes out digital audio data of music registered in the selected playlist from the storage and supplies it to the playback circuit. The audio signal player according to claim 1,
An audio signal regenerator in which the above motion is walking (including running, and so on). The audio signal player according to claim 1 or 2,
The detection means is integrated with or separate from the storage, the reproduction circuit, and the control circuit,
An audio signal player adapted to be worn on the user's body, clothes or portable items. Detect the user's exercise tempo,
The detected movement tempo is classified into a plurality of groups according to the appearance frequency of the movement tempo, and the group with the lower appearance frequency of the movement is distributed to other groups.
Create multiple playlists in which songs with tempos corresponding to the tempo of exercise included in the multiple groups are registered,
When the user plays music while exercising, it detects the tempo of the exercise,
It is determined which of the plurality of groups the detected tempo of the exercise is included,
While selecting a playlist corresponding to the group as a result of the discrimination among the plurality of playlists,
A method of reproducing an audio signal in which digital audio data of music registered in the selected playlist is extracted from a storage and supplied to a reproduction circuit. The method of reproducing an audio signal according to claim 4,
An audio signal playback method in which the above movement is walking.

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