JP2017168961A - Simultaneous playback program, simultaneous playback system, portable terminal and luminous body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simultaneous playback program that reduces delay time from program start to playback start without requiring an acoustic device having large output and a power supply therefor, and that can play back music data simultaneously even when program execution speed of a portable terminal for each viewer is different.SOLUTION: A simultaneous playback program P in which common data M is played back simultaneously in playback time S being commonly set between a plurality of portable terminals comprises the steps of measuring delay time BD from time when a portable terminal 3A outputs a sound MT for measurement to time when the portable terminal 3A detects the output sound MT, and beginning execution of the playback program before the playback time S based on the delay time BD.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a simultaneous playback program, a simultaneous playback system, a mobile terminal, and a light emitter, and more particularly, a simultaneous playback program and a simultaneous playback system for simultaneously playing back playback data on a plurality of mobile terminals at a set playback time. The present invention relates to a portable terminal and a light emitter.

  There is a way to enjoy music that allows people who gathered on the spot to feel a sense of unity by listening to common music at the same time. This way of enjoying music is different from the way of enjoying music that individual individuals listen to and listen to in their own rooms, so-called live and concerts, etc., have been popular in the past. Yes.

  However, it is necessary to have a venue of a certain scale in order to hold a conventional concert, etc., and since it is necessary to hear music throughout the venue, an audio device with a large output is also required, which is not easy to perform. It was.

  By the way, recently, mobile terminals such as smartphones are widely used, and each person owns one. Therefore, the present inventor has devised a way to enjoy a concert-like feeling by allowing a plurality of people gathered at the same place to simultaneously play the same music from their own mobile terminals. Of course, such a way of enjoyment is meaningless if the music is played apart, and must be played simultaneously on each terminal. As a result of investigation by the present inventor, it was found that the sound deviation that can be accepted by human beings is a very short time of within 0.036 seconds. Therefore, when music is played back simultaneously on a plurality of terminals, the difference in playback at each terminal must be within 0.036 seconds. Feeling uncomfortable.

  Therefore, a method of simultaneously playing music on a mobile terminal owned by each person is known. For example, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-129518), common time information is received based on a synchronization signal such as Japan Standard Time using a cesium atomic clock received from a network, Many portable terminals perform simultaneous playback by matching the time.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-40450) describes a portable terminal that plays back simultaneously with a control signal from a server instead of a control signal of the portable terminal in the concert mode.

  Further, when music is played back by streaming, transmission paths from the transmission terminal to the reception terminal are different from each other. Therefore, an error occurs in the time from reception of reproduction data due to a difference in transmission distance and line state to reproduction. In Patent Document 3 (Japanese Patent Laid-Open No. 2006-212380), the delay time measurement unit measures the transmission time to each receiving terminal, and based on the maximum transmission time, reproduction from the time of data transmission to the time of reproduction at the receiving terminal The delay time is determined, the delay time from reception of data to reproduction by each receiving terminal is calculated, and this is transmitted to each receiving terminal 3. Thus, a technique for correcting an error in time from reception to reproduction is disclosed.

JP 2007-129518 A JP 2004-40450 A JP 2006-2111380 A

  The inventor first creates a program for simultaneously playing music on a plurality of portable terminals, distributes music data and a playback start time of the music data in advance from a server, and plays the music data on a plurality of terminals. When I played back and listened to it, I noticed that there was a slight difference in the timing of starting playback on each terminal. This difference in start of playback has exceeded an allowable 0.036 seconds, and it cannot be used as a simultaneous playback program in which a plurality of people enjoy music played back simultaneously.

  The present inventor has examined the reason why the timing of starting playback is shifted for each terminal, and has found that there is a reason specific to the terminal due to the difference in mobile terminals. In other words, not only various types of mobile terminals are sold by many manufacturers, but also the latest models and the old models exist and are used. For this reason, the CPU, memory, and various designs differ from terminal to terminal, and the processing time for the playback subroutine, AD conversion time, and the time from when the speaker is driven until the sound is emitted differ from terminal to terminal. Noticed that there will be a difference in the timing at which

  Thus, even if the common time information is received as in Patent Document 1 and the times are made coincident with each other in a large number of portable terminals, the time is reached. This problem cannot be solved because the timing at which the sound is actually started to be reproduced is different for each terminal.

  Similarly, even if playback is performed simultaneously with a control signal from a server as in Patent Document 2, the timing at which sound is actually started to be played back at each terminal differs, so this problem cannot be solved.

  Further, just considering only the error due to the difference in the transmission path as in Patent Document 3, it is not only possible to solve the problem due to the deviation of the reproduction timing due to the delay reason specific to the terminal, but the music reproduction method is The technique of Patent Document 3 cannot be applied when playing data that has been downloaded in advance is not limited to streaming and is played back at a predetermined time.

  In order to solve such a problem, the present invention eliminates reproduction delay caused by each terminal, and simultaneously reproduces common reproduction data on a plurality of terminals, a simultaneous reproduction system, a portable terminal, and An object is to provide a light emitter.

  In order to achieve the above object, a simultaneous reproduction program for simultaneously reproducing common reproduction data at a reproduction time set in common for a plurality of portable terminals, which is output after outputting sound for measurement from the portable terminal. Measuring a delay time until the sound is detected by the portable terminal, and starting execution of the reproduction of the common reproduction data before the reproduction time based on the delay time. And

  Due to differences in the load on the CPU, memory and CPU of the mobile terminal, the acoustic circuit, etc., the time for which the sound is output from the speaker differs even when a plurality of mobile terminals start simultaneous playback simultaneously. The present invention is a simultaneous playback program that individually measures its own delay time in each mobile terminal and advances the playback execution time in each mobile terminal based on the delay time. Even if there is a difference in the load status on the memory or CPU, the acoustic circuit, etc., the common reproduction data is reproduced from a plurality of portable terminals at the same time, and a plurality of people can hear the common reproduction data started. Therefore, it is possible to feel a sense of unity like a concert with a large number of people using a plurality of portable terminals.

  In the simultaneous playback program of the present invention, the playback speed is set based on the difference between the standard time intermittently received by the mobile terminal via the network and the time of the clock inside the mobile terminal during playback. It is preferable to include a step of correcting intermittently. As a result, even if a sound shift occurs during reproduction, it can be reduced.

  In the simultaneous reproduction system of the present invention, the common reproduction data and the reproduction start time data are transmitted to a plurality of portable terminals via the network, and the common reproduction data is simultaneously reproduced at the reproduction start times by the plurality of portable terminals. A delay time measuring means for measuring a delay time from when each mobile terminal outputs a sound for measurement from the mobile terminal until the output sound is detected by the mobile terminal; and the delay time Correction delay time holding means for holding the delay time in the portable terminal measured by the measuring means, and the reproduction of the common reproduction data is held in the correction delay time holding means in the portable terminal Further, the reproduction is started before the reproduction start time based on the delay time.

  According to this simultaneous playback system, the delay time measuring means measures the delay time of each mobile terminal, and the playback of the common playback data is started before the playback start time based on the delay time. Therefore, even if there is a difference in the load on the CPU, memory and CPU of the mobile terminal, the common playback data is played back simultaneously from a plurality of mobile terminals, and a plurality of people can listen to the common playback data that has started. it can. Therefore, it is possible to feel a sense of unity like a concert with a large number of people using a plurality of portable terminals.

  In the portable terminal of the present invention, when the reproduction start time acquired via the network is reached, the portable terminal reproduces the common reproduction data until the output sound is detected after the measurement sound is output. A delay time measuring means for measuring a delay time; and a correction delay time holding means for holding the delay time in the portable terminal measured by the delay time measuring means, Based on the delay time held in the correction delay time holding means, the reproduction is started before the reproduction start time.

  According to the portable terminal, the delay time is measured by the delay time measuring means, and the reproduction of the common reproduction data is started before the reproduction start time based on the delay time. Even when there is a difference in the load status on the CPU or the like, when the common reproduction data is reproduced simultaneously using a plurality of portable terminals, the common reproduction data having the same start can be heard. Therefore, it is possible to feel a sense of unity like a concert with a large number of people using a plurality of portable terminals.

  The light emitter of the present invention is characterized in that it is connected to the portable terminal and emits light in synchronization with the common reproduction data reproduced by the portable terminal. According to this light emitter, the user of the light emitter can enhance the sense of unity with the participant at the reproduction location of the common reproduction data.

FIG. 1A is a diagram showing a system configuration of the first embodiment, and FIG. 1B is a diagram showing an example of event notification. It is a block diagram which shows the structure of the principal part of the smart phone of 1st Embodiment. It is a flowchart of the main routine of the simultaneous reproduction program of 1st Embodiment. It is a flowchart of the measurement subroutine in FIG. 5A is a time chart showing the measurement of the delay time in the measurement subroutine in FIG. 4, and FIG. 5B is a time chart showing the time from the start of execution of the reproduction program to the start of speaker output. It is a figure which shows the structure of the system of 2nd Embodiment. It is a block diagram which shows the structure of the principal part of the smart phone of 2nd Embodiment. It is a block diagram which shows the structure of the principal part of the light-emitting body of 2nd Embodiment. It is a flowchart of the main routine of the simultaneous reproduction program of 2nd Embodiment. 10 is a flowchart of a time correction subroutine in FIG. 9. 10 is a flowchart of a reproduction / light emission subroutine in FIG. 9. It is a figure which shows the change of the luminescent color in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the embodiments and drawings. However, the embodiments shown below are not intended to limit the present invention to those described herein, and The invention can be equally applied to various modifications without departing from the technical idea shown in the claims. In addition, in each drawing used for the description in this specification, in order to make each member a size that can be recognized on the drawing, each member is displayed with a different scale, and is not necessarily actual. It is not displayed in proportion to the dimensions.

[First Embodiment]
A simultaneous reproduction system 100 according to a first embodiment of the present invention will be described with reference to FIG. The simultaneous reproduction system 100 is a system for simultaneously reproducing music that is the same common reproduction data from a plurality of smartphones (abbreviated as smartphones).

  The simultaneous playback system 100 includes an application server (abbreviated as AP server) 1 for uploading a simultaneous playback program P to the Internet N, a concert server 2 for uploading music data M including playback start time data S to the Internet N, and a portable terminal. The first, second and third smartphones 3A, 3B and 3C.

  In addition to the simultaneous reproduction program P, the application server 1 exists in the form of an online store that distributes a wide variety of other application software free of charge. The concert server 2 exists in the form of a music distribution site operated by a music company, for example. The application server 1 and the concert server 2 may be the same server.

  The smartphones 3A, 3B, and 3C are smartphones that can download the simultaneous reproduction program P uploaded as application software from the Internet N. In addition, the smartphones 3A, 3B, and 3C can download the music data M including the reproduction start time data S from the concert server 2 by installing the downloaded simultaneous reproduction program P, and intermittently (every 20 seconds). NTP (Network Time Protocol) time information NTP in Japan standard time can be received from Tokyo J.

  Here, a specific usage example using the smartphones 3A, 3B, and 3C installed with the application software of the simultaneous reproduction program P will be described. For example, the owner who owns the smartphones 3A, 3B, 3C is a fan of the same singer A. The company B that operates the concert server 2 guides the event on a dedicated site in the form of the event notification example of FIG. 1B.

  Each person who sees the event guide on this site makes an application to participate in an event he or she is interested in. In this example, the owners of the smartphones 3A, 3B, 3C each apply for advance participation in the event 1. Then, by applying for advance participation, music data M including reproduction start time data S is distributed in advance to the first, second, and third smartphones 3A, 3B, and 3C. Saved on the terminal.

  Then, each person gathers in advance at the venue before the playback start time of event 1. When the playback start time comes, the same music starts to be played from each mobile terminal at once. In this way, by using the simultaneous playback system 100, it is possible to play the same music at the playback start time at a specific location at the same time. Can taste. In the present embodiment, the simultaneous reproduction of music from each portable terminal can be matched with extremely high accuracy. Therefore, the sense of unity of the participants is further increased without feeling unpleasant echoes. Also, if you can set the location, song, and playback start time yourself, people with similar music tastes can gather together to easily feel a sense of unity like a concert or live performance.

  The simultaneous reproduction system 100 according to the first embodiment capable of such use will be described more specifically. First, the configuration of the main part of the smartphone 3A will be described with reference to FIG. The smartphones 3A, 3B, and 3C are different models, but the configuration of the smartphone 3A is basically the same as the smartphones 3B and 3C. However, “A” is appended to the end of the reference numerals for the main components of the smartphone that the present inventor considers as the main cause of the deviation in the reproduction start time.

  The smartphone 3A includes a control circuit 10A that controls each unit, a RAM 11A that temporarily stores data when the control circuit 10A operates, and a simultaneous reproduction program P that includes, for example, a nonvolatile EEPROM and operates the control circuit 10A. ROM 12A for storing music data M necessary for this, and simultaneous playback program P, music data M and time information NTP are received from the Internet N via the antenna 13 and sent to the control circuit 10A, or light is emitted from the control circuit 10A. A communication circuit 14A for transmitting a light emission signal to the body 4, an amplifier circuit 15A for amplifying the audio signal, a speaker 16A for converting the audio signal amplified by the amplifier circuit 15A into sound, and an external sound as an electrical signal From the microphone 17 which converts the sound into a sound signal and outputs it as an audio signal. Amplifying circuit 18 for amplifying a voice signal, a display / input unit 19 for performing information display, light emission and input by integrating a touch panel with a display body such as liquid crystal or organic EL, and a crystal oscillator (not shown). A clock circuit 20A.

  Further, the smartphone 3A is provided with a delay time measuring means including a control circuit 10A, a ROM 12A, an amplifier circuit 15A, a speaker 16A, a microphone 17, and an amplifier circuit 18 by installing the simultaneous reproduction program P. The correction delay time holding means including the circuit 10A and the ROM 12 is provided.

  Here, the control circuit 10A, the RAM 11A, the ROM 12A, the communication circuit 14A, the speaker 16A, and the amplifier circuit 15A for the speaker 16A with reference numerals attached with “A” are related to the operation of generating music by executing a program for reproducing music. It is a major component. There are various types of smartphones, old and new. For this reason, even if a program for playing music on a plurality of models is executed all at once, the time until the music is output from the speaker 16A is different for each model due to the difference in the constituent parts of the reference symbol with “A” attached. Different. Further, in the control circuit 10A, when the load is large, for example, when the CPU is simultaneously executing a plurality of application software, the processing speed of the CPU decreases. In addition, there are mobile terminals other than smartphones such as tablets and personal computers. Therefore, it is inherently very difficult to play music from a plurality of mobile terminals all at once.

  The operation of the control circuit 10A of the smartphone 3A that executes the simultaneous reproduction program P of the first embodiment will be described with reference to FIGS. It is assumed that the smartphone 3A has already downloaded the simultaneous reproduction program P uploaded from the application server 1 from the Internet N and stored it in the ROM 12A. The simultaneous reproduction program P includes a measurement sound MT.

  The smartphones 3B and 3C perform the same operation. In order to make the characteristics of the first embodiment easier to understand, in the first embodiment, the time by the clock circuit 20A of the smartphone 3A is the same as the time by the clock circuit 20A of the smartphones 3B and 3C. . That is, it is assumed that the smartphones 3A, 3B, and 3C have a clock that keeps the exact same time.

  As shown in the main routine of FIG. 3, the control circuit 10A uses a variable S as a playback start time in a register (not shown) in the control circuit 10A, and uses the variable CRY as the clock circuit 20A of the first smartphone 3A. (Step S1). By assigning variables to registers instead of RAM 21A, processing speed is improved. When the variables are assigned, the process proceeds to a measurement subroutine for measuring the delay time during reproduction in the smartphone 3A (step S2).

  As shown in the measurement subroutine of FIG. 4, the control circuit 10A uses the variable T as a timer for counting the elapsed time, the variable BD as the delay time from the start of the measurement subroutine program to the detection of the speaker sound, and the variable as the time to accelerate playback. FG is assigned (step S11). Then, the control circuit 10A resets the variable T to 0 and starts a timer, and executes the statement of the program so as to start outputting the measurement sound MT from the speaker 16A (step S12).

  The sound MT for measurement is included as data in the simultaneous reproduction program P. The measurement sound MT has a rising edge and a falling edge, and is a waveform smoothed at a predetermined volume (a waveform shaped like a ridgeline of a mountain cut from a predetermined height). This smoothing process facilitates detection by the microphone 17. Also, detection failure such as noise is prevented by outputting this waveform a plurality of times.

  When the measurement sound MT is detected by the microphone 17, the time from the start of the timer to the measurement sound MT detection is stored in the ROM 12 constituting the correction delay time holding means as the delay time BD (step S13). Then, the playback time FG is set to the same time as BD (step S14), and the subroutine is finished and the process proceeds to step 3 in FIG. It should be noted that the delay time BD measured by this measurement subroutine is naturally different for different smartphones 3A, 3B, 3B.

  The control circuit 10A checks whether or not the music data M exists in the ROM 12A in step S3 of FIG. 3, and if there is no music data M (No in step S3), the control circuit 10A performs an operation of downloading the music data M (step S4). .

  For example, in the case of the usage example described with reference to FIG. 1B, the music data M is downloaded at the same time as the application for participation in the event, or automatically when the playback start time approaches. The configuration of Further, instead of a configuration in which downloading is automatically performed, a configuration in which a message prompting the user to download is also possible. Therefore, in the present embodiment, an example is shown in which the music data M includes the reproduction start time data S and is distributed. However, the music data M and the reproduction start time data S need to be distributed at the same time. They may be distributed separately.

  The control circuit 10A sets the reproduction time included in the downloaded music data M as a variable S (step S5), and proceeds to step S7. If there is music data M in the ROM 12A in step S3 (Yes in step S3), the playback time included in the music data M is set as a variable S (step S6), and the process proceeds to step S7.

  The control circuit 10A waits until the variable CRY, which is the time of the clock circuit 20A, becomes equal to or greater than S + FG in step S7 (No in step S7). When the variable CRY becomes equal to or greater than S + FG (Yes in Step S7), the control circuit 10A executes a playback subroutine for driving the speaker 16A in the simultaneous playback program P and starts playing music (Step S8). The flowchart of the playback subroutine is not particularly shown, but in this embodiment, playback is performed at a frame rate of 30 per second. When the music has been reproduced, the simultaneous reproduction program P is terminated.

  FIG. 5A is a time chart showing the main part of the operation of the measurement subroutine of FIG. 4 and will be described. A is the time when the execution of the measurement subroutine program is started. B is the time when the program starts to start outputting sound to the speaker 16A. C is when the speaker 16A starts outputting sound. D is when the control circuit 10A detects the measurement sound MT from the speaker 16A via the microphone 17.

  From B to D, the processing time of the control circuit 10A, the processing time of the amplifier circuit 15A for the speaker 16A, the operation time of the speaker 16A, the recognition time of the microphone 17, the processing time of the amplifier circuit 18 for the microphone 17 and the control circuit It takes 10A recognition time. The time from B to D is BD.

  FIG. 5B is a time chart showing the time from the start of playback subroutine execution to the start of speaker output, which will be described. E is the time to start waiting. F is the time when the execution of a reproduction subroutine for driving to output music from the speaker 16A is started. G is when the speaker 16A starts outputting music.

  From F to G, the processing time of the control circuit 10A, the processing time of the amplifier circuit 15A for the speaker 16A, and the operation time of the speaker 16A are required. The time from F to G is FG.

  There are various old and new models in the smartphones 3A, 3B, 3C. For this reason, the time from when the playback subroutine for driving the speaker 16A is started to when the music is actually output from the speaker differs depending on the smartphones 3A, 3B, and 3C. For this reason, even if the time of the three clocks coincides and the three execute the reproduction subroutine at the same time, the sound output from each of the three clocks is shifted.

  Therefore, the simultaneous playback program of the first embodiment measures a delay time from when the sound for measurement is output from the smartphone 3A until the output sound is detected, and before the playback time based on the delay time. The playback subroutine is started. That is, since the timing for starting reproduction is corrected according to the delay time for each smartphone, it is possible to reduce the deviation of the sound emitted from the speaker 16A. In addition, since the reproduction subroutine starts to be executed early in anticipation of the delay time, it is possible to reduce the delay in starting the reproduction time. The smartphone 3A, which is the mobile terminal of the first embodiment, holds a delay time measurement unit that measures a delay time from when a measurement sound is output until the output sound is detected, and holds the delay time. A delay time holding means for correction, and the music playback is started before the playback start time based on the delay time at the start of music playback. Can start.

  Further, in this embodiment, since the smartphones 3A, 3B, and 3C each output sound simultaneously, a large acoustic device and a large-scale venue are unnecessary, and a live performance or a concert can be easily performed. The allowable sound deviation within 0.036 seconds is about 12 m in terms of the speed of sound, but in this embodiment, there is no sound deviation caused by the difference in distance from the sound source. In addition, since a mobile terminal such as a smartphone is used, each player can listen to the music played at the same time through headphones. In this case, there is no need to worry about noise around the meeting place.

In the present embodiment, the delay time FG in FIG. 5B is set equal to the time BD for speeding up reproduction in FIG. 5A, but the present invention is not limited to this. For example, if you obtain a number of BD and FG values in an experiment and obtain an approximate function expression f (x) = C ₁ + C ₂ x + C ₃ x ² + C ₄ x ³ from this value by the least square method Since the storage capacity of the function formula is a simple calculation with only four numbers (constants C _{1 to} C ₄ ), an approximate FG can be obtained from the BD at a very high speed with a small storage capacity.

  Further, in the case of the usage example of the present embodiment as described with reference to FIG. 1B, the events are gathered at the venue before the playback start time of the event 1. However, for example, when it is impossible to go to the place at the time of the event due to an emergency, it may be a problem that the music starts to flow at the playback start time in another place. Therefore, it is preferable that the mobile terminal is configured to start playback only at the venue. As such a configuration, specifically, although not shown, for example, a mobile terminal such as the smartphone 3A generally includes means for specifying the current position using a GPS (Global Positioning System) or the like. . Therefore, this means for specifying the current position can prevent the portable terminal away from the venue from performing the reproduction of the common reproduction data even when the reproduction start time comes.

[Second Embodiment]
Next, the simultaneous reproduction system 100II of the second embodiment will be described with reference to FIGS. In summary, the simultaneous reproduction system 100II of the second embodiment is obtained by adding a time correction function of an internal clock and a light emission function synchronized with sound to the simultaneous reproduction system 100 of the first embodiment. The display / input unit 19II and the separate light emitter 4 are caused to emit light.

  6 corresponds to FIG. 1A in the simultaneous reproduction system 100 of the first embodiment, FIG. 7 corresponds to FIG. 2, and FIG. 9 corresponds to FIG. In the simultaneous playback system 100II of the second embodiment, the same reference numerals are assigned to the same components as those of the simultaneous playback system 100 of the first embodiment, and the configuration is similar to that of the simultaneous playback system 100 of the first embodiment. For the parts to be applied, only the differences are noted by adding the subscript “II” to the reference numerals.

  In the simultaneous reproduction system 100II of the second embodiment shown in FIG. 6, the simultaneous reproduction system 100II includes two light emitters 4 in addition to the simultaneous reproduction system 100 of the first embodiment. The illuminant 4 is similar to a portable lighting fixture often used in concert venues, for example, a portable lighting fixture such as a lighting fixture using a chemical light or an LED. It is used to further increase And this light-emitting body 4 is a rod-shaped thing which is respectively connected to the smartphones 3AII and 3BII and is synchronized with the smartphones 3AII and 3BII, respectively, and is controlled to emit light based on the light emission signals from the smartphones 3AII and 3BII. is there. The light emitter 4 is connected to the smartphone 3AII wirelessly such as Bluetooth (registered trademark) or Wi-Fi (registered trademark), and is connected to the smartphone 3BII via a connection cable 5 by wire.

  A smartphone 3AII of the second embodiment in FIG. 7 is obtained by adding a connection unit 21 for connecting the light emitter 4 with a cable 5 to the smartphone 3A shown in FIG. The simultaneous reproduction program PII of the second embodiment stored in the ROM 12A is obtained by adding a time correction program and a light emission program to the simultaneous reproduction program P of the first embodiment. The display / input unit 19II of the second embodiment displays a star key 20a for turning on / off the light emission of the display / input unit 19II and a # (getter) key 20b for turning on / off the light-emitting body 4, and touches it. Make it work by action.

  FIG. 8 is a block diagram showing a configuration of a main part of the light emitter 4 of the second embodiment. The light emitter 4 is composed of a control circuit 30 for controlling each part, a RAM 31 for temporarily storing data when the control circuit 30 operates, and a program for operating the control circuit 30 which is composed of, for example, a nonvolatile EEPROM. ROM 32 for storing necessary data, a communication circuit 34 for receiving a light emission signal from a smartphone through an antenna 33 by wireless connection with the smartphone, and a light emitting unit 35 for emitting multicolor light having LEDs of three primary colors of light , An input unit 36 having a turn-on key 36a and a turn-off key, and a connection unit 37 used for wired connection with a smartphone.

  9 to 11 are flowcharts showing main operations of the simultaneous reproduction program PII of the second embodiment. The same steps as those of the simultaneous reproduction program P of the first embodiment are denoted by the same step symbols.

  Incidentally, in the first embodiment, the time of the clock circuit 20A of the smartphone 3A is the same as that of the smartphones 3B and 3C. That is, the smartphones 3A, 3B, and 3C are provided with a clock that keeps the exact same time.

  However, in general, the smartphones 3A, 3B, and 3C do not record the exact same time. In the second embodiment, the smartphones 3A, 3B, and 3C all receive time information NTP in Japan standard time from the same NTP Tokyo J. Because the performance of the quartz oscillators of the internal clocks is different, the times are different from each other.

  In FIG. 9, the control circuit 10AII of the smartphone 3AII of the second embodiment uses the variable S as the reproduction time, the time of the NTP that received the variable NTP, the variable CRY as the time of the clock circuit 20A of the smartphone 3A, and the variable ΔW. It is assigned as an initial clock error (step S21). When variables are assigned, the process proceeds to a measurement subroutine (step S2). The measurement subroutine is the same as that in FIG. 4 of the first embodiment.

  When returning from the measurement subroutine, the control circuit 10AII starts a timer for measuring 20 seconds (step S22). Then, the time NTP of NTP Tokyo J is acquired, and the difference in the time CRY of the internal clock is calculated and set to ΔW (step S23).

  Then, the reproduction time is obtained as variable S in the same manner as steps S3 to S6 in FIG. Then, it waits until the time CRY of the internal clock comes before FG of the time when the reproduction time S is corrected by the error ΔW with NTP Tokyo J (No in step S24).

  During this standby, if the deviation of the internal clock is measured every 20 seconds and becomes longer than a predetermined time, the time is corrected by the time correction subroutine (steps S25 and S26). FIG. 10 is a flowchart showing the operation of this time correction subroutine.

  The control circuit 10AII assigns the variable ΔWN as the difference between the time of the NTP Tokyo J before the update and the internal clock (step S31). Then, the time NTP of NTP Tokyo J is acquired, and the difference of the time CRY of the internal clock is calculated and set to ΔWN (step S32).

  Then, the absolute value of the difference between the latest error ΔWN and the conventional ΔW is compared and if it is 0.036 seconds or more (Yes in step S33), the variable ΔW is updated to the value of the variable ΔWN (step S35). In step S35, the 20-second timer is reset. If it is less than 0.036 seconds in step S33, the process proceeds to step S35 as it is. When step S35 is completed, the time correction subroutine ends and returns.

  When the standby ends in step S24 of FIG. 9, the control circuit 10AII proceeds to the reproduction / light emission subroutine of step S27. FIG. 11 is a flowchart showing the operation of the reproduction / light emission subroutine of step S27.

  The control circuit 10AII assigns the variable L1 as ON / OFF of light emission of the display / input unit 19II of the first smartphone 3AII and the variable L2 as ON / OFF of light emission of the light emitting unit 35 of the light emitter 4 (step S41). Light emission is ON when L1 = 1, and light emission is ON when L2 = 1. Then, the control circuit 10AII performs reproduction (step S42). This reproduction is continued until the music ends (Yes in step S58).

  The star key 20a in FIG. 7 is a toggle switch for determining whether or not the display / input unit 19II emits light (S43 to S46). The # key 20b is a toggle switch for determining whether or not the light emitting unit 35 of the light emitter 4 emits light (S48 to S50).

  The control circuit 10AII causes the display / input unit 19II to emit light if the variable L1 is 1 (S51, S52), and causes the light emitting unit 35 of the light emitter 4 to emit light if the variable L2 is 1 (S53, S54). In the second embodiment, as shown in FIG. 6, the smartphone 3AII emits the wirelessly connected light emitter 4, the smartphone 3BII emits the wired emitter 4, and the smartphone 3C includes the display / input unit 19II. Emits light. The user can select ON / OFF of each light emission.

  In the present embodiment, the luminous body 4 connected to the smartphones 3AII and 3BII is caused to emit light in synchronization with the music being played back on the smartphones 3AII and 3BII, so that the participants can feel a sense of unity, fantastic and lyrical. Can be produced. Moreover, even if there is no light emitter 4, the display / input unit 19II of the smartphone 3A can emit light, thereby producing any space such as unity, fantastic and lyrical.

  Further, the control circuit 10AII changes the light emission method in synchronization with music. Although there are various methods, FIG. 12 is an example, and the color is changed in accordance with the volume level and the sound frequency. Conventional portable lighting devices such as chemical lights did not change in light emission in synchronization with music.

  The control circuit 10AII proceeds to the time correction subroutine of FIG. 10 every 20 seconds (step S55) during the reproduction of Yes in step S58 from the reproduction start in step 42 (step S56). If the absolute value of the difference between the latest error ΔWN and the initial ΔW is compared with Yes in step S33 in FIG. 10 and is equal to or greater than 0.036 seconds, the variable ΔW is updated to the value of the variable ΔWN. Then, returning from the time correction subroutine of FIG. 10, the playback time is advanced by ΔW−ΔWN (step S57), thereby correcting the time during playback.

  As described above, the simultaneous playback program PII of this embodiment checks the time lag every 20 seconds even during playback, and corrects the tune playback position if there is a lag above the threshold. Even so, the deviation of music from other smartphones can be reduced.

  That is, the smartphones 3A, 3B, and 3C have slightly different times because the performances of the quartz oscillators of the respective internal clocks are different. Therefore, even if playback is started simultaneously at the playback start time, the playback position of the music gradually shifts during playback due to the difference in the internal clock thereafter. For example, for an accurate 20 seconds, some smartphones have an internal clock that slightly slows down and ticks 20 seconds, and also has an internal clock that ticks down slightly later than 20 seconds. Some are. Therefore, even if there is a 20-second song, even if this song is played with the playback start positions aligned, the end of the song will not be completed.

  In this embodiment, not only at the start of playback but also during playback, time information NTP in Japan standard time is acquired as the standard time, and the deviation between the standard time and the internal clock is checked, and a deviation greater than the threshold is detected. If there is, correction of the playback position of the song (for example, skipping for several frames) is performed, so that it is possible to reduce music deviation from other smartphones even during playback. In the second embodiment, the threshold value of the error between ΔW and ΔWN at step 33 is 0.036 seconds, but the threshold value of the present invention is not limited to 0.036 seconds. The standard time is not necessarily limited to the time information NTP in Japan standard time, and for example, time data from GPS can be used.

  According to the simultaneous playback program PII, the simultaneous playback system 100II, and the mobile terminals 3AII, 3BII, 3CII, and the light emitter 4 according to the present embodiment, the playback delay caused by each mobile terminal is eliminated and the playback start time is shared simultaneously. Playback data can be played back. Further, it is possible to eliminate a playback shift caused by each mobile terminal not only at the start of playback but also during playback.

  Further, by using the light emitter 4 that is connected to the portable terminal and emits light in synchronization with the common reproduction data reproduced by the portable terminal, the user of the light emitter can further enhance the sense of unity.

  Furthermore, in the event of simultaneous music playback for a long time, if the display / input unit 19II of the mobile terminal is caused to emit light, the battery on the mobile terminal side is consumed quickly. However, since the use of the light emitter 4 can suppress battery consumption on the mobile terminal side, this embodiment is also suitable for long-time events.

  In addition, in the simultaneous music playback event, intense movements such as shaking hands violently will be added as it rises, so if you swing around the light emitting mobile device, there is a risk that the mobile device may jump out of your sweaty hand, It is dangerous for people. However, unlike the mobile terminal, the light emitting body 4 is a tool dedicated to light emission, and therefore, it is possible to easily realize the processing and shape of the anti-slip, so that the safety is high.

  In addition, since the portable terminal is usually rectangular, only the rectangular display surface of the display / input unit 19II emits light, so that only a person in a specific direction can confirm the light emission. Therefore, for example, in the case of a stage-type music simultaneous playback event, it is not possible to confirm the mobile terminal emitting light from behind, so the overall excitement is lacking. However, since it becomes possible to confirm the light emission from all directions by using the rod-shaped light emitter 4, this embodiment is more suitable for an event that increases the overall excitement. The light emitter 4 is not limited to a light emitting rod, and may be a wristband or a light emitting pen, for example.

  In addition, although the portable terminal of the above-mentioned embodiment was a smart phone, this invention is not limited to a smart phone or a smart phone. In addition, although the smartphone downloaded the simultaneous playback program and music data from the Internet, the present invention is not limited to the Internet. For example, data may be transferred from a storage medium, and at least one of the simultaneous playback program and music data is stored. The recorded recording medium may be attached to a smartphone.

  In the above-described embodiment, the sound data for measurement is included in the simultaneous playback program. However, it may not be included, and the playback time is included in the music data as well.

  Further, the common reproduction data reproduced by the present invention is not limited to music, and may be, for example, voice data read from a sentence or voice data read from a quiz problem. In other words, since it is possible to start playback of common playback data on each mobile device at the same time, it is easy to use the mobile device for events such as readings, classes and quiz games where it is important to start playback simultaneously. can do. Furthermore, the present invention can be applied to reproduction data such as moving images other than sound.

1: Application server 2: Concert server 3A, 3AII, 3B, 3BII, 3B, 3BII: Smartphone 4: Light emitter 10A: Control circuit 12A: ROM
16A: Speaker 17: Microphone 19: Display / input unit 21A: Clock circuit 100, 100II: Simultaneous playback system

Claims (5)

A simultaneous playback program for simultaneously playing back common playback data at a playback time set in common on a plurality of mobile terminals,
Measuring a delay time from the output of the measurement sound from the portable terminal to the detection of the output sound by the portable terminal;
Starting execution of the reproduction of the common reproduction data before the reproduction time based on the delay time;
A simultaneous playback program characterized by including:   A step of intermittently correcting a playback speed based on a difference between a standard time intermittently received by the mobile terminal via a network and a clock time inside the mobile terminal during playback. The simultaneous reproduction program according to claim 1. A simultaneous reproduction system that transmits common reproduction data and reproduction start time data to a plurality of mobile terminals via a network, and simultaneously reproduces the common reproduction data at a reproduction start time on a plurality of portable terminals,
Each mobile device
A delay time measuring means for measuring a delay time from the output of the measurement sound from the portable terminal to the detection of the output sound by the portable terminal;
A correction delay time holding means for holding the delay time in the portable terminal measured by the delay time measuring means;
With
The simultaneous reproduction system is characterized in that the reproduction of the common reproduction data is started before the reproduction start time based on the delay time held in the correction delay time holding unit in the portable terminal. When the playback start time acquired via the network is reached, the mobile device plays the common playback data,
A delay time measuring means for measuring a delay time from the output of the sound for measurement to the detection of the output sound;
A correction delay time holding means for holding the delay time in the portable terminal measured by the delay time measuring means;
With
The portable terminal is characterized in that the reproduction of the common reproduction data is started before the reproduction start time based on the delay time held in the correction delay time holding means.   A light emitter that is connected to the portable terminal according to claim 4 and emits light in synchronization with common reproduction data reproduced by the portable terminal.