JP2021085952A - Music playback device, music playback method and music playback program - Google Patents

Abstract

To play back music without any sense of incompatibility even if a playback position is changed during a playback of the music.SOLUTION: A DAP 1 comprises a CPU 2. The CPU 2 finds a playback closest beat which is closest to a current playback position. The CPU 2 finds a change closest beat which is closest to a playback position whose change is accepted. The CPU 2 finds a change candidate beat which is closest to the change closest beat and at a position within the same measure with the playback closest beat. The CPU 2 finds a distance from the current playback position to the playback closest beat, and determines a position obtained by subtracting the found distance from the change candidate beat as a playback position after change. The CPU 2 restarts the playback at the playback position after the change.SELECTED DRAWING: Figure 2

Description

The present invention relates to a music playback device for playing music and the like, a music playback method, and a music playback program.

Some music playback devices (audio players) that play music or the like have a seek function that allows the user to move the playback point of the music to a desired point. The user generally can use this seek function even during playback. However, when the user seeks during playback, the playback suddenly jumps to a point desired by the user, so that the music being played is cut off, in other words, there is a problem that the connection is lost. In addition, Patent Document 1 describes seek reproduction of contents.

JP-A-2010-146602

As described above, if the playback position is changed during the playback of the music, there is a problem that the music playback is not connected.

An object of the present invention is to enable a comfortable reproduction even if the reproduction position is changed during the reproduction of the music.

The music playback device of the first invention finds the nearest beat to be played, which is the closest beat from the current playback position, finds the nearest beat to be played, which is the closest beat to the playback position where the change is accepted, and finds the nearest beat to be changed. Find the change candidate beat, which is the beat closest to the beat and located in the same bar as the playback nearest beat, find the distance from the current playback position to the playback nearest beat, and set the found distance as the change candidate. The feature is that the position subtracted from the beat is used as the changed playback position.

In the present invention, a change candidate beat that is closest to the change nearest beat and is located in the same bar as the reproduction nearest beat is required. Then, the distance from the current reproduction position to the nearest reproduction beat is obtained, and the position where the obtained distance is subtracted from the change candidate beat is defined as the change position. Therefore, the current playback position and the changed playback position are aligned. As a result, even if the reproduction position is changed during the reproduction of the music, the reproduction can be performed without a sense of discomfort.

The music playback device of the second invention is characterized in that the music playback device of the first invention further accepts a change in the playback position during the playback of a musical piece.

The music playback device of the third invention is characterized in that, in the music playback device of the second invention, when a change in the playback position is received during the playback of a musical piece, the nearest playback beat is obtained.

The music playback device of the fourth invention is characterized in that, in the music playback device of any one of the first to third inventions, the position of a beat existing in the music is further determined.

The music playback device of the fifth invention further determines, in the music playback device of any one of the first to fourth inventions, which beat the nearest playback beat is from the file start position. It is a feature.

The music playback device of the sixth invention is characterized in that, in the music playback device of the fifth invention, the remainder calculation is further performed at an arbitrary number of beats to estimate the position of the nearest beat to be played in the bar. ..

The music playback device of the seventh invention further determines, in the music playback device of any one of the first to sixth inventions, which beat the change nearest beat is from the file start position. It is a feature.

The music playback device of the eighth invention is characterized in that, in the music playback device of the seventh invention, the remainder calculation is further performed at an arbitrary number of beats to estimate the position of the changed nearest beat in the bar. ..

The music playback device of the ninth invention is characterized in that, in the music playback device of any one of the first to eighth inventions, playback is restarted from the changed playback position.

In the music reproduction method of the tenth invention, the nearest beat to be reproduced, which is the closest beat from the current reproduction position, is obtained, and the nearest beat to be changed, which is the nearest beat from the reproduction position where the change is accepted, is obtained, and the most modified beat is obtained. Find the change candidate beat, which is the beat closest to the beat and located in the same bar as the playback nearest beat, find the distance from the current playback position to the playback nearest beat, and set the found distance as the change candidate. The feature is that the position subtracted from the beat is used as the changed playback position.

The music playback program of the eleventh invention finds the nearest beat to be played, which is the closest beat from the current playback position, finds the nearest beat to be played, which is the closest beat to the playback position where the change is accepted, and finds the nearest beat to be changed. Find the change candidate beat, which is the beat closest to the beat and located in the same bar as the playback nearest beat, find the distance from the current playback position to the playback nearest beat, and set the found distance as the change candidate. The position subtracted from the beat is set as the changed playback position.

According to the present invention, even if the reproduction position is changed during the reproduction of the music, the reproduction can be performed without a sense of discomfort.

It is a block diagram which shows the structure of the digital audio player which concerns on embodiment of this invention. It is a figure for demonstrating the processing operation at the time of seek of DAP. It is a flowchart which shows the processing operation at the time of seek of DAP.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a block diagram showing a configuration of a digital audio player (hereinafter, referred to as “DAP”) 1 according to the present embodiment. As shown in FIG. 1, the DAP 1 (music playback device) includes a CPU 2, a storage unit 3, a display unit 4, an operation unit 5, a DSP 6, a D / A converter (hereinafter referred to as “DAC”) 7, an amplifier circuit 8, and an amplifier circuit 8. It includes a wireless module 9 and a USB interface (hereinafter referred to as "USB I / F") 10. Headphones 101 are connected to DAP1.

The CPU (Central Processing Unit) 2 (control unit) controls each unit constituting the DAP 1 according to an application program including a control program, an OS program, and a music playback program P. The storage unit 3 includes a RAM (Random Access Memory) that functions as the main memory of the CPU 2, a ROM (Read Only Memory) that stores a control program, an OS program, a program such as an application program including a music playback program P, digital audio data, and the like. It consists of a flash memory that stores various types of data. The storage unit 3 is not limited to the configuration illustrated, and may include an HDD (Hard Disk Drive) or the like.

The display unit 4 is composed of an LED for displaying power on / off and the like, a liquid crystal panel for displaying various images (including still images and moving images), and the like. The operation unit 5 includes operation keys for performing various settings and a touch panel linked with the display unit 4. The user can perform various character inputs, settings, seek instructions, and the like via the operation unit 5. The DSP (Digital Signal Processor) 6 performs signal processing such as equalizer processing on digital audio data. The DAC 7 D / A-converts digital audio data into analog audio data. The amplifier circuit 8 amplifies the analog audio data D / A-converted by the DAC 7 and outputs the analog audio data to the headphones 101. The headphone 101 outputs audio based on the analog audio data output by the amplifier circuit 8.

The wireless module 9 is for performing wireless communication in accordance with the Bluetooth (registered trademark) standard and the Wi-Fi standard. The digital audio data for reproducing the sound may be data stored in the storage unit 3 or may be data transmitted from an external device via the wireless module 9. The USB I / F10 is for performing communication in accordance with the USB standard.

The DAP1 has a seek function of accepting a change (designation) of the reproduction position of the music during the reproduction of the music and restarting the reproduction from the accepted reproduction position. The user can change (designate) the playback position from the operation unit 5.

In the present embodiment, even if the playback position is changed during the playback of the music, the CPU 2 analyzes the music, calculates the beat position information, and during the playback of the music. , When a change (seek) in the playback position of the music is accepted, the playback start position (seek destination point) is corrected based on the calculated beat position information.

FIG. 2 is a diagram for explaining a processing operation at the time of seeking of DAP1.
(1) The CPU 2 obtains the position of a beat existing in the music. It should be noted that finding the beat position is an existing technique.
(2) When the CPU 2 accepts a change (seek) in the playback position of a musical piece, it obtains the nearest (nearest) beat (nearest playback beat) from the current playback position (playback point) and positions it in the bar. To estimate. Here, "closest" means the closest in time.
(3) The CPU 2 obtains the nearest (nearest) beat (change nearest beat) from the playback position (designated (preceding) point) that has received the change, and estimates the position in the bar.
(4) The CPU 2 searches for the same beat (change candidate beat) as the nearest (2) from the beat (change nearest beat) obtained in (3). That is, the CPU 2 obtains a change candidate beat, which is a beat closest to the change nearest beat and located in the same bar as the reproduction nearest beat.
(5) The CPU 2 obtains the distance between the playback position (playback point) before accepting the change and the nearest beat (playback nearest beat) used in (2), and the position subtracted from (3) is used for playback. The restart position (seek point). That is, the CPU 2 obtains the distance from the current playback position to the nearest playback beat, and the position obtained by subtracting the obtained distance from the change candidate beat is set as the changed playback position.

The CPU 2 resumes playback from the changed playback position.

Hereinafter, the processing operation at the time of seeking of DAP1 will be described with reference to the flowchart shown in FIG. The CPU 2 executes an existing beat position detection algorithm for the reproduced music and obtains the beat position (S1). Next, the user operates a play button or the like in order to start the music playback on the DAP 1, and the CPU 2 accepts the operation of the play button or the like by the user and starts the music playback (S2). Next, the user designates an arbitrary seek point with a seek bar or the like in order to cause DAP1 to perform the seek, and the CPU 2 accepts the designation of the seek point by the movement of the seek bar by the user (S3).

Next, the CPU 2 obtains the nearest beat (reproduction nearest beat) from the current reproduction point (S4). Next, the CPU 2 obtains the number of the beat obtained in S4 from the start position of the file, and performs a remainder calculation with an arbitrary number of beats in order to estimate the position in the bar ( S5). For example, assuming a song with 4 beats, the number of beats may be 8 beats, 16 beats, etc., or by using an existing beat detection algorithm, a multiple of the beat number may be dynamically used for each song. .. Next, the CPU 2 obtains the nearest beat (changed nearest beat) from the destination point designated in S3 (S6). Next, the CPU 2 obtains the number of the beat obtained in S6 from the start position of the file, and performs a remainder calculation with an arbitrary number of beats in order to estimate the position in the bar (S7). ..

Next, the CPU 2 searches for a point (change candidate beat) of the number of beats obtained in S5, which is the closest to the beat obtained in S7 (S8). Next, the CPU 2 obtains the distance between the reproduction point and the nearest beat (reproduction nearest beat) obtained in S4 (S9). Next, the CPU 2 sets a point obtained by subtracting the distance obtained in S9 from the point of the number of beats obtained in S8 (change candidate beat) as a seek point (reproduction position after the change) (S10).

As described above, in the present embodiment, a change candidate beat that is closest to the further nearest beat and is located in the same bar as the reproduction nearest beat is required. Then, the distance from the current reproduction position to the nearest reproduction beat is obtained, and the position where the obtained distance is subtracted from the change candidate beat is defined as the change position. Therefore, the current playback position and the changed playback position are aligned. As a result, even if the reproduction position is changed during the reproduction of the music, the reproduction can be performed without a sense of discomfort. In other words, it is possible to alleviate the discomfort that occurs when the seek is performed during playback, which causes the music to be chopped.

Although the embodiments of the present invention have been described above, the embodiments to which the present invention can be applied are not limited to the above-described embodiments, and as illustrated below, appropriate as long as the gist of the present invention is not deviated. It is possible to make changes.

In the above-described embodiment, the case where the music playback program P is installed in DAP1 has been described. Not limited to this, the device that functions as a music playback device may be a smartphone, a tablet PC, a feature phone, a portable media player, a portable game machine, a speaker device, or the like.

The present invention can be suitably adopted in a music reproduction device for reproducing music or the like, a music reproduction method, and a music reproduction program.

1 DAP (Music Player)
2 CPU (control unit)
3 Storage unit 4 Display unit 5 Operation unit P Music playback program

Claims (11)

Find the closest beat to the playback position, which is the closest beat to the current playback position.
Find the closest beat to the change, which is the closest beat to the playback position where the change was accepted.
Find the change candidate beat, which is the beat closest to the change nearest beat and located in the same bar as the playback nearest beat.
A music playback device characterized in that the distance from the current playback position to the nearest playback beat is obtained, and the position obtained by subtracting the obtained distance from the change candidate beat is used as the changed playback position. The music playback device according to claim 1, further comprising accepting a change in the playback position during music playback. The music playback device according to claim 2, wherein when a change in the playback position is accepted during playback of a musical piece, the nearest beat for playback is obtained. The musical device according to any one of claims 1 to 3, further comprising finding the position of a beat existing in the music. The music playback device according to any one of claims 1 to 4, further comprising finding the number of the nearest beat to be played from the file start position. The music playback device according to claim 5, further comprising performing a remainder calculation at an arbitrary number of beats to estimate the position of the nearest beat to be played within a bar. The music playback device according to any one of claims 1 to 6, further comprising finding which beat the nearest changed beat is from the file start position. The music playback device according to claim 7, further comprising performing a remainder calculation with an arbitrary number of beats to estimate the position of the nearest changed beat in a bar. The music playback device according to any one of claims 1 to 8, wherein playback is restarted from the changed playback position. Find the closest beat to the playback position, which is the closest beat to the current playback position.
Find the closest beat to the change, which is the closest beat to the playback position where the change was accepted.
Find the change candidate beat, which is the beat closest to the change nearest beat and located in the same bar as the playback nearest beat.
A music playback method characterized in that the distance from the current playback position to the nearest playback beat is obtained, and the position obtained by subtracting the obtained distance from the change candidate beat is used as the changed playback position. Find the closest beat to the playback position, which is the closest beat to the current playback position.
Find the closest beat to the change, which is the closest beat to the playback position where the change was accepted.
Find the change candidate beat, which is the beat closest to the change nearest beat and located in the same bar as the playback nearest beat.
A music playback program for finding the distance from the current playback position to the nearest beat to play, and setting the position obtained by subtracting the found distance from the change candidate beat as the changed playback position.

Images