JPH1049177A - Terminal equipment and data transmission system with the equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently acquire data from a one directional drop flow type data transmission. SOLUTION: A CPU 61 compares a music ID of a music data successively transmitted from a center through the prescribed channel of a coaxial cable 7 and the music ID in which an acquisition complete flag among a request. new music table 65a in a RAM 65 is set to '0'. When the Ids agree to each other, the music data are acquired, the data are stored in a music data memory 65b in the RAM 65 for a karaoke performance and the acquisition complete flag is set to '1'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device for executing predetermined data processing based on data transmitted from a central control device via a transmission line, and a central control device for transmitting data to the terminal device. And a data transmission system comprising the same.

[0002]

2. Description of the Related Art Conventionally, for example, cable television (CA)
Like a karaoke system using a TV (TV) system, a center (central control unit) and a plurality of terminal devices are connected via a transmission line, and various data (for example, karaoke performance data, text data) are sent from the center to the terminal device side. A data transmission system of a so-called one-way flow-through system for sequentially transmitting image service data) is known. In such a data transmission system, each terminal device does not need to have a large storage device or the like that previously stores data such as karaoke software and movie software, so that the configuration of the terminal device becomes very simple. There are advantages such as.

[0003]

However, in the data transmission system of the above-mentioned conventional one-way flow-through system, there are the following problems when it is desired to acquire certain data. Here, to facilitate understanding of the problem,
A system is considered in which music data of a group is repeatedly and sequentially transmitted from the center, and the terminal device obtains desired data when it arrives while monitoring the music data transmitted through the transmission path.

[0004] Assuming that there is a total of K pieces of music data that are sequentially and repeatedly transmitted from the center, in the worst case, desired data cannot be obtained without waiting for K pieces of data. For example, when about 5,000 songs are transmitted, it is good if the desired song arrives at a good timing when the access is started, or if it is coming soon, but the access is started immediately after the desired song has passed. In this case, since it is not possible to acquire the music until the user has waited for about 5000 songs, the waiting time becomes longer, which is inconvenient when urgently desired.

[0005] From the viewpoint of urgently acquiring data, a request-type data transmission device is better. However, in that case, a transmission system capable of bidirectional transmission must be constructed. In addition, other control processing (for example, control related to traffic management) that takes into consideration various inconveniences such as a communication inability due to a concentrated request becomes necessary, so that the advantage of the one-way flow-through method remains. While standing
There is a need for faster data acquisition.

Accordingly, the present invention has been made to solve the above-mentioned problem, and a terminal device capable of efficiently obtaining data as a whole while presuming so-called one-way flow data transmission, and a terminal device therefor. It is an object to provide a data transmission system including a terminal device.

[0007]

According to the first aspect of the present invention, there is provided a central control apparatus and a transmission line for cyclically transmitting a plurality of data in a predetermined order. A request storage unit that stores up to a predetermined number of requests received by the request reception unit based on the reception order, in a terminal device that is connected at and can acquire data transmitted from the central control device; If data corresponding to the request stored in the request storage means and not yet obtained is transmitted on the transmission path, regardless of the order in which the requests are received, data that can be obtained early is Data acquisition means for preferentially acquiring, data storage means for storing data acquired by the data acquisition means,
A data processing unit capable of performing predetermined data processing based on the data stored in the data storage unit.

The terminal device of the present invention is connected via a transmission path to a central control device that cyclically transmits a plurality of data in a predetermined order, and acquires data transmitted from the central control device. There is a characteristic in the acquisition method. That is, the terminal device stores the received requests up to a predetermined number based on the reception order, and data corresponding to the stored requests that have not been acquired have been transmitted on the transmission path. In this case, regardless of the order in which requests are received, data is acquired preferentially from data that can be acquired early. The data processing means executes predetermined data processing based on the obtained data.

In accordance with the order in which requests are received, for example, if data corresponding to the second request cannot be obtained unless data corresponding to the first request is obtained,
As pointed out as a problem in the prior art, it is good when data corresponding to the first request arrives at a good timing when access is started, or when data comes soon, but it is better to respond to the first request. If the access is started immediately after the data has passed, the data cannot be obtained without waiting until the data corresponding to the first request transmitted cyclically comes again, and the waiting time becomes longer. However, before data corresponding to the first request is transmitted again, 2
It is conceivable that data corresponding to a request received in lower order, such as data corresponding to the number request or data corresponding to the number 3 request, may come. for that reason,
According to the present invention, when data corresponding to a request but not yet obtained is transmitted on the transmission path, regardless of the order in which the requests are received, the data is obtained preferentially from "early obtainable" data. I am trying to do it.

[0010] By doing so, it is possible to realize efficient data acquisition as a whole while premising so-called one-way flow-through data transmission. Even if the data acquisition order is not related to the request reception order, it is preferable that the predetermined data processing by the data processing means is basically executed in accordance with the request reception order.

According to a second aspect of the present invention, there is provided a designated identification information storage means for storing up to a predetermined number of pieces of identification information of data designated in advance to be acquired in addition to the request accepted by the request accepting means. The obtaining means is data corresponding to the request stored in the request storage means or data corresponding to the identification information stored in the designated identification information storage means, and the data not yet obtained has been transmitted on the transmission path. In such a case, data may be acquired preferentially from data that can be acquired earlier, regardless of the order in which requests are received or the order in which identification information is stored in the designated identification information storage means.

The "data specified to be acquired in addition to the request accepted by the request accepting means" here means, for example, data that is likely to be executed by the data processing means, It is data that seems to be high. Specific examples include new music data when applied to karaoke and music data with a higher request ranking. In other words, in the present invention, the designated data is also acquired in addition to the data in response to the request. By doing so, when those songs are requested, it is possible to respond immediately. This is based on the premise that a predetermined number of songs that are likely to be used frequently are stored in the terminal device, and the songs are also appropriately acquired.

In the case where not only the request-corresponding data but also the specified data is obtained, a third aspect of the present invention is provided.
It is also conceivable to make a contrivance as shown in (1). In other words, when there is data corresponding to the request stored in the request storage means and there is unacquired data, the data acquisition means gives priority to data that can be acquired early, regardless of the order in which the requests are received. The data corresponding to the identification information stored in the designated identification information storage means and the unacquired data are identified only when the data corresponding to the request and there is no unacquired data are obtained. Irrespective of the order in which the information is stored, data is acquired preferentially from data that can be acquired early.

This is because it is basically assumed that the data corresponding to the request is obtained after the request is made and then the data is processed by the data processing means. Is not preferred. On the other hand, since the designated data is not required immediately, it may be obtained in a situation where there is no other disadvantage. Therefore, if the designated data is acquired only when there is no unacquired data corresponding to the request, the acquisition of the request corresponding data or the subsequent processing is not affected.

There are various types of data transmitted in this manner, and one of the representative data is karaoke performance data. And in this case, the data processing means
A predetermined karaoke performance process is executed based on the karaoke performance data.

According to a fifth aspect of the present invention, there is provided a data transmission means for storing a plurality of data and a data transmission for transmitting a series of data groups stored in the data storage means cyclically in a predetermined order. A central control device provided with means and a plurality of terminal devices according to any one of claims 1 to 4 are connected by a transmission line, and are data transmission systems capable of transmitting data from the central control device to the terminal devices. .

In this case, the data transmission means of the central control unit cyclically transmits a series of data groups stored in the data storage means in a predetermined order, so that the series of data groups is transmitted via the transmission path. This is transmitted to the terminal device side. Since the operation in the terminal device or the effect thereof has been described above, it will not be repeated here.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, an example of application to a karaoke system 1 configured by connecting a center 3 as a central control device and a number of karaoke terminal devices 5 as terminal devices via a transmission path will be described. Here, FIG. 1 is a block diagram showing a schematic configuration of the entire karaoke system 1 and a configuration of a center 3, and FIG. 2 is a block diagram showing a configuration of a karaoke terminal device 5.

As shown in FIG. 1, the present karaoke system 1
Is configured such that a center 3 and a plurality of karaoke terminal devices 5 are connected by a coaxial cable 7 which is a transmission path. Here, the karaoke terminal devices 5 may be provided separately in different buildings, or may be provided for individual stores or boxes in one building.

Next, the configuration of the center 3 will be described with reference to FIG. The center 3 includes a polling control unit 11,
Polling modem 13, data transmission control unit 15, data transmission modem 17, and storage device 1 storing music data
9, a background video output device (VDP) 21a, 21b,
BS (Satellite Broadcasting) receiving system 23 and headend 2
5 and the like.

The polling control unit 11 includes a well-known CPU,
A polling modem 1 provided with a ROM, a RAM (not shown) and the like via an input / output interface (I / O) 27;
3 is connected. The polling modem 13 modulates the polling signal output from the polling controller 11 into a high-frequency signal of a predetermined channel (that is, a predetermined frequency band), outputs the modulated signal to the headend 25, and transmits the modulated signal to the karaoke terminal device 5. I do. Polling modem 1
3 receives and demodulates the response signal transmitted from the karaoke terminal device 5.

The data transmission control unit 15 includes a CPU, a ROM, and a RAM (not shown), like the polling control unit 11.
And an input / output interface 31 via a bus line 29, and a storage device 1 as a "data storage means".
9. Connected to background image output devices 21a and 21b. The data transmission control unit 15 is connected to the above-described polling control unit 11 via the input / output interfaces 27 and 31 and the transmission line 33, and can transfer data to each other.

The data transmission modem 17 modulates the music data read from the storage device 19 into a high-frequency signal of a channel different from the above-mentioned polling signal transmission channel, and outputs the modulated music data signal to the head end 25. And transmits it to the karaoke terminal device 5. The data transmission control unit 15 and the data transmission modem 17 constitute a “data transmission unit”.

As the storage device 19, a large-capacity storage device such as a hard disk or a magneto-optical disk is used, and music data of about several thousand songs is stored. The song data for one song includes a synchronization signal, song ID data indicating a song number,
The data includes performance data and data indicating the end (delimiter) of data for one music. The performance data includes MIDI standard data which is data of accompaniment music, lyrics data displayed on a monitor television of the karaoke terminal device 5 described later, and the like.

The background image output devices (video disc players) 21a and 21b are karaoke terminal devices 5 described later.
Output the background image information projected on the monitor television of the desired music. For example, one output device 21a outputs an image for enka, and the other output device 21b outputs an image for pop music. Genre). Each of the background image output devices 21a and 21b is connected to a modulator 35, and image data (a standard NTSC (United States Television System Committee) video signal) is transmitted to different channels by the modulator 35. Modulated to a high-frequency signal of
Output to the head end 25.

The BS receiving system 23 includes a receiving antenna 36, a BS tuner 37, and a modulator 39.
The modulator 39 is connected to the head end 25. The head end 25 is provided with various devices (not shown) such as a mixer for transmitting a signal to the coaxial cable 7. The head end 25 includes the polling modem 13 described above.
, A song data signal from the data transmission modem 17, a background image signal from the background image output devices 21a and 21b, and a BS broadcast signal from the BS reception system 23, and a plurality of signals having different channels. Are multiplexed, output to the coaxial cable 7, and transmitted to each karaoke terminal device 5.

Next, the configuration of the karaoke terminal device 5 is shown in FIG.
It will be described based on. The karaoke terminal device 5 includes a control unit 41 that performs overall control, an input device 43, a sound source 45,
An amplifier 47, a speaker 49, and a video compositing circuit 51
, A monitor television 53, a terminal modem 57 and a video tuner 59 which receive and process signals from the center 3.
And so on.

The control section 41 controls the entire karaoke terminal device 5, and includes a CPU 61, a ROM 63,
It includes a RAM 65 and the like, and is connected to the input device 43, the sound source 45, the input / output interface 69, the video synthesizing circuit 51, and the like via the bus line 67. And RAM
In the area 65, a request / new music table 65a and a music data memory 65b are set.

This request / new score table 65a is
As shown in FIG. 3, in the present embodiment, a table for setting a song ID and an acquired flag is prepared for ten songs. 1 to
No. 5 is the area for the requested song, 6-
No. 10 is set as an area for a new music piece.
The acquired flag is “1” when the corresponding song data is acquired from the song data group transmitted from the center 3 by a process described below, and is “0” in a non-acquired state. The request area of the request / new record table 65a corresponds to “request storage means”, and the new music area corresponds to “designated identification information storage means”.

On the other hand, the music data memory 65b corresponds to "data storage means",
When the music data corresponding to the music ID stored in a is acquired, the memory is used to store the music data. As shown in FIG. A data storage area (NA) is prepared.

The input device 43 is provided with various switches for the user to operate the karaoke terminal device 5, such as a numeric keypad for inputting the song number of the requested song, and whether to perform karaoke or BS broadcast. Are provided with various mode switches (not shown) for selecting. In addition,
The input device 43, the control unit 41, and the like constitute a “request receiving unit”.

The sound source (synthesizer sound source) 45 includes:
The MIDI data included in the music data is converted into a karaoke accompaniment audio signal.
Is input to The amplifier 47 mixes and amplifies the karaoke accompaniment audio signal from the singer and the singing audio signal from the microphone 71, and outputs it to the speaker 49. The sound source 45, the amplifier 47, and the speaker 4
9 and the control unit 41 constitute a “data processing means”.

The video synthesizing circuit 51 converts the lyric data contained in the music data into a lyric video signal, and synthesizes (superimposes) the lyric data with the background image signal input from the video tuner 59, and the monitor television 53. Output to The terminal modem 57 receives and demodulates a polling signal and a music data signal transmitted from the center 3 via the coaxial cable 7, modulates a response signal output from the control unit 41, and transmits the modulated signal to the center 3. Is what you do. Here, the response signal is a signal for returning to the center 3 in response to a polling signal transmitted from the center 3. In addition,
The terminal modem 57, the control unit 41, and the like constitute a “data acquisition unit”.

The video tuner 59 receives the background image signal transmitted from the center 3 and the BS broadcast signal from the BS receiving system, and selects a channel to obtain a desired video signal. Next, the operation of the karaoke system 1 according to the present embodiment having the above-described configuration will be described.

First, the operation of the center 3 will be described. When music data is transmitted from the center 3, the data transmission control unit 15 controls the data transmission control unit 15 for a certain period of time (the time set as the allowable time from when the user requests the music and the performance is started). Then, the music data stored in the storage device 19 is transmitted to the karaoke terminal device 5 via the coaxial cable 7 through a predetermined channel. In this case, the music data is transmitted cyclically in a predetermined order. In other words, when transmitting a song whose song ID is No. 1 to 5000, the data transmission control unit 15 sends the song data group to the data transmission modem 17 via the input / output interface 31, and the head end 25 and the Through the coaxial cable 7,
The data is sequentially transmitted to the karaoke terminal device 5. And 5000
When all the songs have been transmitted, the song ID is sequentially transmitted again from the song data with the first song ID.

Next, the operation of each karaoke terminal device 5 will be described. FIG. 5 is a flowchart showing the request receiving process, FIG. 6 is a flowchart showing the song data obtaining process, and FIG. These processes are executed in parallel by a so-called multitask.

In the request accepting process (FIG. 5), in the first step S110, it is determined whether or not the request area (see FIG. 3) of the request / new record table 65a is empty. If there is a vacancy (S1
10: YES), the process proceeds to S120, and the input device 4
From 3, it is determined whether or not the music number of the requested music has been input. When a song number is input (S120: YE
S), proceed to S130, request / new music table 6
5a is newly registered in the request area, and then S11
Return to 0.

Next, the music data acquisition processing (FIG. 6) will be described. In the first step S10, it is determined whether there is any unacquired music in the request / new music table 65a (FIG. 3). This can be determined based on whether or not there is a piece of music whose acquired flag remains “0”. If there is no unacquired song, this process is temporarily terminated. If there is an unacquired song (S10: YES), the process proceeds to S20.

At S20, the request / new score table 6
5a (FIG. 3), the song ID of which the acquired flag remains "0" is compared with the song ID of the song data sequentially transmitted from the center 3 through a predetermined channel of the coaxial cable 7. Then, in subsequent S30, it is determined whether or not both match. The process of S20 is repeated until they match, and if they match (S30: YES), the process proceeds to S40.

In S40, the music data whose music ID matches is acquired and stored in the music data memory 65b of the RAM 65. When the acquisition and storage in S40 is completed (S40)
50: YES), and proceeds to S60 to set the acquired flag in the request / new record table 65a of FIG. 3 to "1". Thereafter, the process returns to S10 to determine whether or not there is any unacquired music.

The music data acquired in the music data acquisition processing is not limited to the music ID stored in the request area in the request / new music table 65a of FIG. 3, but is also stored in the new music area. Includes the song ID of the song. The music ID stored in the new music area is set in advance by the administrator of the karaoke terminal device 5 manually setting the desired new music, or automatically updated and set by the karaoke terminal device 5 at predetermined intervals. It is something that goes. Therefore, in S10 of FIG. 6, it is determined whether or not there is a song that has not been acquired, regardless of the request area and the new music area. In S40, the music corresponding to the music ID set in the new music area is, of course. Data may be acquired and stored, and the same applies to S60.

Next, the music performance processing (FIG. 7) will be described. First, in the first step S210, FIG.
The song ID stored at the head of the request area in the request / new score table 65a is extracted. Then, in S220, it is determined whether or not the music data corresponding to the music ID is in the storage area (NA) of the new music corresponding data in the music data memory 65b of FIG. 4, and if it is in the storage area (NA). (S220: YES), the process proceeds to S240, and the corresponding music data is taken out and played. On the other hand, if it is not in the storage area (NA) of the new music corresponding data (S220: NO), the process proceeds to S230 to determine whether it is in the storage area (RA) of the request corresponding data, and the storage area (RA) is determined. (S230: Y
ES), and proceeds to S240.

If a negative determination is also made at S230,
It returns to S220. That is, the music data memory 6 shown in FIG.
5b until the data is stored in one of the two storage areas (NA) and (RA). The above-described music data acquisition processing in FIG. 6 is performed in parallel with the music performance processing in FIG. 7, and if music data is acquired and stored in S40 in FIG. 6, S220 or S230 in FIG. There is a possibility that a positive determination may be made. The possibility was that
The song data corresponding to the song ID extracted in S210 is shown in FIG.
Is not necessarily obtained in S40.

The performance process in S240 will be briefly described. The lyric data of the extracted tune data is input to the video synthesizing circuit 51 and converted into a lyric video signal. The background image signal whose channel has been selected by the video tuner 59 is also input to the video synthesizing circuit 51. And
The background image information and the lyric video signal are synthesized (superimposed) by the video synthesizing circuit 51, and the character string of the lyric is superimposed on the background image and displayed on the monitor television 53. On the other hand, M included in the retrieved music data
The IDI data is converted into an accompaniment audio signal by the sound source 45 and input to the amplifier 47. This accompaniment voice signal is mixed with a singing voice signal from the microphone 71 by the singer, amplified as appropriate, and output from the speaker 49. This allows the user to enjoy karaoke.

After S240, it is determined in S250 whether or not the performance has been completed.
250: YES), the process proceeds to S260, and the request area in the request / new score table 65a of FIG. 3 is updated. In other words, the data for the requested song whose performance has been completed, that is, the data at the beginning, is deleted, and the subsequent data are moved up one by one. As a result, if the first request is processed in the next process of S210, the performance according to the request order is realized.

After the updating process in S260, the process proceeds to S2
Move to 70. In S270, if the music data played in S240 is in the request corresponding data storage area (RA) of the music data memory 65b (FIG. 4), the music data is deleted. This is because only the music data corresponding to the request which has not been played at that time is stored in the storage area (RA) of the request corresponding data. In other words, if there is unnecessary song data, if there is a new request after that, the song data corresponding to the request cannot be stored, and the song data for which the performance has been completed is deleted.

As described in detail above, in the karaoke system 1 of the present embodiment, a predetermined music data group is sequentially transmitted cyclically from the center 3 to the karaoke terminal device 5 side. The apparatus stores the received requests up to a predetermined number based on the order in which the requests have been received. If data corresponding to the stored requests but not yet obtained is transmitted on the coaxial cable 7, Is obtained with priority over data that can be obtained early, regardless of the order in which requests are received.

According to the order in which requests are received, for example, if data corresponding to the second request cannot be obtained unless data corresponding to the first request is obtained,
As pointed out as a problem in the prior art, it is good when data corresponding to the first request arrives at a good timing when access is started, or when data comes soon, but it is better to respond to the first request. If the access is started immediately after the data has passed, the data cannot be obtained without waiting until the data corresponding to the first request transmitted cyclically comes again, and the waiting time becomes longer. However, before data corresponding to the first request is transmitted again, 2
It is conceivable that data corresponding to a request received in lower order, such as data corresponding to the number request or data corresponding to the number 3 request, may come. for that reason,
In the karaoke terminal device 5 according to the present embodiment, when data corresponding to the request but not yet acquired is transmitted on the coaxial cable 7, regardless of the order in which the requests are received, the data can be acquired early. Nana ”data is acquired with priority.

By doing so, it is possible to realize efficient data acquisition as a whole while assuming data transmission in a so-called one-way flow-through system. In the present embodiment, the music data of the new music piece is acquired as “data specified to be acquired in addition to the request”. This is data that is likely to be executed in a karaoke performance. By acquiring this data in advance and storing it in the music data memory 65b, when those music are requested, it is immediately performed. Can be supported. This is based on the premise that a predetermined number of songs that are likely to be used frequently are stored in the terminal device, and the songs are also appropriately acquired. Although the music data of the new music piece has been described as a specific example, other music data having a higher request ranking may be used.

Although the embodiment has been described above, the present invention is not limited to the above embodiment, and can be implemented in various modes. For example, in the case of the above embodiment, FIG.
If any of the song IDs stored in the request / new song table 65a shown in (1) are not yet acquired, regardless of whether the song is a request-adaptive song or a new song, the song ID is acquired from a song that can be acquired early. The following measures may be taken. In other words, in the case of a request-compatible song, regardless of the order in which requests are received, priority is given to the song data that can be acquired earlier, but in the case of a new song, unacquired songs that have not been requested Get it only if you don't have it. In the case of a song corresponding to a request, it is assumed that song data is acquired after a request is made, and then karaoke is performed immediately thereafter. Therefore, it is not preferable to delay the song due to other factors. On the other hand, since the music data of the new music piece is not required immediately, it may be obtained in a situation where there is no other disadvantage. Therefore,
Only when there is no unacquired song data corresponding to the request, if the song data of the new song is acquired, it will affect the acquisition of the song data of the requested song or subsequent karaoke performance processing. I will not give.

In the above-described embodiment, the music data used for the karaoke performance in the karaoke terminal device 5 is taken as an example, but various other data may be considered. For example,
It may be normal song data other than karaoke, or data for character image service.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of the entire karaoke system and a configuration of a center according to the present embodiment.

FIG. 2 is a block diagram illustrating a configuration of a karaoke terminal device of the present embodiment.

FIG. 3 shows a request in the RAM of the karaoke terminal device.
It is an explanatory view showing a new musical score table.

FIG. 4 is an explanatory diagram showing a music data memory in a RAM of the karaoke terminal device.

FIG. 5 is a flowchart showing a request receiving process in the karaoke terminal device.

FIG. 6 is a flowchart showing a music data acquisition process in the karaoke terminal device.

FIG. 7 is a flowchart showing a music playing process in the karaoke terminal device.

[Explanation of symbols]

Reference Signs List 1 Karaoke system 3 Center 5 Karaoke terminal device 7 Coaxial cable 15 Data transmission control unit 17 Data transmission modem 19 Storage device 25 Head end 35 Modulator 36 Antenna 41 Control unit 43 Input device 45 sound source 47 amplifier 49 speaker 51 video synthesizing circuit 53 monitor television 59 video tuner 61 CPU 65 RAM 65a request / new music table 65b music data memory

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04M 11/08 H04N 7/16 Z // H04N 7/16 9744-5K H04L 11/18

Claims (5)

[Claims] 1. A terminal device connected via a transmission line to a central control device for cyclically transmitting a plurality of data in a predetermined order and capable of acquiring data transmitted from the central control device, The received request,
Request storage means for storing up to a predetermined number based on the reception order; and data corresponding to the request stored in the request storage means, wherein unacquired data is transmitted on the transmission path. Irrespective of the order in which the requests are received, data acquisition means for preferentially acquiring data that can be acquired early, data storage means for storing data acquired by the data acquisition means, And a data processing means capable of performing predetermined data processing based on the data stored in the means. 2. The apparatus according to claim 1, further comprising: a specified identification information storage unit configured to store up to a predetermined number of pieces of identification information of data specified in advance to be obtained in addition to the request received by the request receiving unit. If data corresponding to the request stored in the storage means or data corresponding to the identification information stored in the specified identification information storage means and not yet obtained has been transmitted on the transmission path, Irrespective of the order in which the requests are accepted or the order in which the identification information is stored in the specified identification information storage means, the data is acquired preferentially from data that can be acquired earlier. Item 2. The terminal device according to item 1. 3. The data acquisition unit, if there is data corresponding to the request stored in the request storage unit and there is unacquired data, early regardless of the order in which the requests are received. The data corresponding to the identification information stored in the designated identification information storage means, as long as the data corresponding to the request is obtained preferentially from the obtainable data and is not obtained yet. 3. The terminal device according to claim 2, wherein the terminal device is configured to acquire an unacquired data preferentially from data that can be acquired early, regardless of the storage order of the identification information. 4. The data processing apparatus according to claim 1, wherein the data is karaoke performance data, and the data processing means is configured to perform a predetermined karaoke performance process based on the karaoke performance data. A terminal device according to item 1. 5. A central control device comprising: data storage means for storing a plurality of data; and data transmission means for cyclically transmitting a series of data groups stored in the data storage means in a predetermined order; A data transmission system which is connected to the plurality of terminal devices according to any one of claims 1 to 4 by a transmission line and is capable of transmitting data from the central control device to the terminal devices.