JPH1132020A - Data transmission system and data broadcasting system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a conventional data broadcasting system, a terminal device includes:
The problem that the communication conditions of the data transmitted by the broadcasting station were selected, and the transmission of data based on the selected conditions could not be requested from the broadcasting station, There was a problem that data based on the data could not be transmitted. A communication management unit includes a transmission line and a transmission device.
In consideration of the information on the usage status of the terminal device, the menu of the candidate of the communication condition of the data that can be transmitted by the transmission device 1 is displayed on the candidate condition display means 8a, 8c of the terminal devices 6a, 6b, and 6c.
b or 8c. Then, the terminal devices 6a, 6b
And 6c select communication conditions from the menu and instruct the transmitting device 1. Thereafter, the data transmitting means 3 of the transmitting device 1 transmits the data based on the communication conditions, and the decoder 9a, 9b or 9c of the terminal device 6a, 6b or 6c obtains and reproduces the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmitting system and a data transmitting system comprising a transmitting device or a broadcasting device for transmitting or broadcasting data such as video and sound under different communication conditions, and a terminal device for receiving the data. It relates to a broadcasting system.

[0002]

2. Description of the Related Art In recent years, when data such as video and sound is transmitted, a technique of transmitting the data using digital signals has become widespread. In addition, the amount of data transmitted tends to be expanded, and, as in digital satellite broadcasting, a plurality of different data such as video and sound are transmitted from a broadcasting station as multi-channel data. Is being sent.

In such a conventional data broadcasting system in which a broadcasting station broadcasts data and a terminal device receives the data, for example, as seen in TV broadcasting, the broadcasting station transmits data at a transmission speed and transmission time. , The quality, that is, the quality when the broadcast data is reproduced on the receiving side, and the communication conditions such as the price are unilaterally determined to broadcast the data.

[0004]

As described above, in the conventional data broadcasting system, since the broadcasting station unilaterally determines the data communication conditions, the terminal device that receives the data receives the data from the broadcasting station. Only data was received.

[0005] In other words, the terminal device selects conditions of transmission speed, transmission time, quality, and / or price of data transmitted by the broadcasting station, and transmits data transmission based on the selected conditions to the broadcasting station. Could not request. Furthermore, the broadcasting station could not transmit data based on the conditions selected by the terminal device.

In a conventional data broadcasting system, a broadcasting station unilaterally determines data communication conditions for broadcasting. For example, a transmission path used for data transmission is determined by the broadcasting station. Even if you can afford to send data of lower quality in a short time,
Even if the broadcast station and the transmission path have room to transmit data, such as the inability to transmit data of lower quality than the determined quality, the broadcast station may not be able to transmit data. .

According to the present invention, in such a conventional data broadcasting system, a terminal device selects conditions of transmission speed, transmission time, quality, and / or price of data transmitted by a broadcasting station, and selects the selected condition. The problem that transmission of data based on the condition could not be requested from the broadcasting station, the problem that the broadcasting station could not transmit data based on the condition selected by the terminal device, and ,
Even if the broadcasting station and the transmission path have room to transmit data, the transmitting apparatus or the broadcasting apparatus transmits the data in consideration of the problem that the broadcasting station may not be able to transmit data. Data transmission speed, transmission time,
A terminal device capable of selecting a condition of quality and / or price and requesting a transmission device to transmit data based on the selected condition, and transmitting data based on a condition selected by the terminal device. A data transmission system and a data transmission device capable of transmitting data, provided that the transmission device has a transmission device capable of transmitting data. It is intended to provide a broadcasting system.

[0008]

According to a first aspect of the present invention, there is provided a transmitting apparatus for transmitting requested data based on a predetermined communication condition, and requesting the transmitting apparatus to transmit the data. A data transmission system comprising: one or more terminal devices that receive data transmitted by the device; wherein the communication condition is determined based on an instruction from the terminal device.

According to a second aspect of the present invention, the communication condition is determined by any two of three conditions of a data transmission time, a data transmission speed and a data quality. 2. The data transmission system according to claim 1, wherein one of the instructions is instructed from the terminal device to the transmission device.

According to a fifth aspect of the present invention, there is provided a broadcast apparatus for broadcasting data having substantially the same contents as a plurality of programs under different communication conditions, and any one of the plurality of programs broadcasted by the broadcast apparatus. And a plurality of terminal devices for selecting and receiving the data broadcast.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, the configuration of a data transmission system according to Embodiment 1 of the present invention will be described.

FIG. 1 shows a block diagram of a data transmission system according to the first embodiment of the present invention.

The data transmission system according to the first embodiment of the present invention includes a transmission device 1, a communication management unit 4, a transmission line 5,
This is a system including terminal devices 6a, 6b and 6c.

The transmitting device 1 comprises a communication condition receiving means 2 and a data transmitting means 3. Communication condition receiving means 2
Has a plurality of candidate menus for the data communication conditions that can be transmitted by the data transmitting means 3 in advance, and each of the terminal devices 6a, 6b, and 6c has a When any of the communication conditions is instructed, this is a means for receiving the communication condition. For those communication conditions and menus,
Details will be described later. The data transmitting means 3 previously holds basic video and sound basic data, such as a two-hour movie, and transmits the data based on the communication conditions received by the communication condition receiving means 2 to the terminal device. 6a, 6b
Or 6c, which can transmit data at a transmission speed of up to 350 Mbps. The basic data will be described later in detail.

The communication management means 4 manages the usage status of the transmission path 5 used for transmitting data from the data transmission means 3 of the transmission device 1 to the terminal device 6a, 6b or 6c, and the usage status of the transmission device 1. In addition, in consideration of the information on the usage status, a menu of communication condition candidates that can be instructed by the terminal devices 6a, 6b and 6c to the transmitting device 1 is selected from the menus provided in the communication condition receiving means 2. It is a means to extract. The usage status of the transmission path 5 and the usage status of the transmission device 1 will be described later. A method for the communication management unit 4 to extract the menu will be described later together with the operation of the data transmission system according to the first embodiment of the present invention.

The transmission path 5 is an information transmission / reception path for mutually transmitting / receiving information between the transmitting apparatus 1, the communication management means 4, and the terminal apparatus 6a, 6b or 6c.
Information can be transmitted and received at transmission speeds up to Mbps. The information includes the data transmitted by the transmitting device 1 to each of the terminal devices 6a, 6b, and 6c, and an instruction from each of the terminal devices 6a, 6b, and 6c to determine the communication condition to the transmitting device 1 or the communication management unit 4. And information on the usage status of the transmission path 5 and the usage status of the transmission device 1 managed by the communication management means 4 and a menu of communication condition candidates that can be instructed by the terminal devices 6a, 6b and 6c to the transmission device 1. , And the above four pieces of information.

The transmission line 5 is used by the transmission device 1, the communication management means 4, and the terminal device 6 a, 6 b or 6 c when transmitting and receiving information to and from each other. Means the amount of information per second.

The status of use of the transmitting device 1 means the amount of data transmitted by the data transmitting means 3 of the transmitting device 1 per second.

The terminal device 6a comprises a transmitting / receiving means 7a, a candidate condition display means 8a, and a decoder 9a.
The transmitting / receiving means 7a includes, among the four pieces of information described above, data that the transmitting device 1 transmits to the terminal device 6a, an instruction from the terminal device 6a for determining communication conditions to the transmitting device 1 or the communication managing unit 4, This is a means for transmitting and receiving the above three pieces of information, including information on a menu of communication condition candidates that can be instructed to the transmitting apparatus 1 by the terminal device 6a. Candidate condition display means 8a
When the user of the terminal device 6a starts using the terminal device 6a, one communication condition is received from the user, and the received communication condition is instructed to the communication management unit 4 via the transmission / reception unit 7a. The terminal device 6a receives information on a menu of communication condition candidates that can be instructed to the transmitting device 1 by the terminal device 6a, displays the menu from the communication management device 4, and displays the menu from the user of the terminal device 6a. It is means for accepting the selection of the communication condition of the data requested to be transmitted to the transmitting device 1 from among the displayed communication condition candidates, and instructing the transmitting device 1 to the received communication condition via the transmitting / receiving means 7a. . The decoder 9a obtains the data transmitted by the transmission device 1 via the transmission / reception means 7a, and based on the data, for example, such as the above-described two-hour movie,
A means for reproducing video and / or sound.

Similarly, the terminal device 6b includes a transmitting / receiving means 7b
, A candidate condition display means 8b, and a decoder 9b. The terminal device 6c includes a transmission / reception means 7c, a candidate condition display means 8c, and a decoder 9c. The transmitting and receiving means 7b and 7c respectively transmit the data transmitted by the transmitting device 1 to the terminal device 6a or 6b and the transmitting device 1 from the terminal device 6b or 6c for determining the communication condition.
Alternatively, it is a means for transmitting and receiving the above three pieces of information, ie, an instruction to the communication management means 4 and information on a menu of communication condition candidates that the terminal device 6b or 6c can instruct the transmitting device 1. When the user of the terminal device 6b or 6c starts using the terminal device 6b or 6c, each of the candidate condition display means 8b and 8c receives one signal from the user.
Two communication conditions are accepted, and the accepted communication conditions are
A means for instructing the transmitting device 1 via the transmitting / receiving means 7b or 7c.
b or 6c receives the information on the menu of the communication condition candidates that can be instructed to the transmitting device 1, displays the menu,
From the user of the terminal device 6b or 6c, selection of a communication condition based on data requested to be transmitted to the transmitting device 1 is received from among the displayed communication condition candidates, and the received communication condition is transmitted and received. This is a means for instructing the transmitting apparatus 1 via the means 7b or 7c. Furthermore, each of the decoders 9b and 9c is a unit that obtains the data transmitted by the transmission device 1 via the transmission / reception unit 7b or 7c, and reproduces video and / or sound based on the data.

The basic data, communication conditions, and menu will be described below.

The basic data is, for example, a two-hour movie such as a movie, in which video and sound are composed of digital signals having an information amount of 720 Gbits. , 5 bit auxiliary component is 1
A 20-bit digital signal unit to be set is 36 × 10
⁹ sets of data. The principal component is a component that is the basis of the data, and the information amount of only the principal component is:
This is the amount of information that can provide video and sound even when reproduced by the decoder 9a, 9b or 9c. As for the sub-component, the quality of the information of the sub-component in addition to the amount of information of the main component is better when reproduced by the decoder 9a, 9b or 9c than when only the information of the main component is reproduced. The amount of information that can provide video and sound. When the auxiliary component is reproduced by the decoder 9a, 9b or 9c in addition to the information amount of the main component and the sub-component, the information amount obtained by adding the sub-component to the main component is reproduced. This is the amount of information that can provide video and sound of higher quality as compared with. The quality of video and sound corresponding to the 720 Gbit information amount of basic data composed of such a main component, a sub component, and an auxiliary component is the best quality.

The communication condition is a condition for deciding a transmission method of data to be transmitted to the terminal device 6a, 6b or 6c based on basic video and sound data previously held by the data transmission means 3 of the transmission device 1. There, terminal device 6
This is a condition determined based on an instruction from the user a, 6b or 6c. The communication conditions include data transmission time,
Of the three conditions of data transmission speed and data quality,
The two conditions are determined by any two conditions. For example, the two conditions are such that the data transmission time is 2 hours and the data transmission speed is 100 Mbps, or the data transmission time is 1 hour and the data quality is A. Is determined.

The data quality is the quality of video and sound corresponding to the data transmitted by the data transmission means 3 of the transmission device 1, and has three levels of A, B and C.
Data quality A is the quality of video and sound corresponding to the basic data. That is, the data quality A is the quality of the video and sound corresponding to the basic data having the information amount of 720 Gbits, and is the best quality. The data quality B is the video and sound quality corresponding to the information amount of 540 Gbits, in which all the auxiliary component bits are deleted from the information amount of 720 Gbits included in the basic data. Data quality C
Is based on the amount of information of 720 Gbits contained in the basic data.
360 with all subcomponent and auxiliary component bits removed
This is the quality of video and sound corresponding to the amount of information of G bits.

As described above, the communication conditions are determined by any two of the three conditions of the data transmission time, the data transmission speed, and the data quality. If the data transmission speed is 100 Mbps, or if the data transmission time is one hour and the data transmission speed is 200 Mbps
In the case of the communication condition described above, the information amount of the data transmitted by the transmitting device 1 is 720 Gbits of information amount, so that the data quality is uniquely determined to be A. Further, for example, in the case where the data transmission time is 2 hours and the data quality is the communication condition of C, the information amount of the data transmitted by the transmission device 1 is an information amount of 360 G bits.
The data transmission rate is uniquely determined to be 50 Mbps. As described above, the communication condition is such that if any two of the three conditions of the data transmission time, the data transmission speed, and the data quality are determined, the remaining one condition is naturally determined.

The menu shows a plurality of candidates for the data communication conditions that can be transmitted by the transmitting apparatus 1. Each of the above-mentioned three candidates for the data transmission time, the data transmission speed, and the data quality is displayed in the menu. It is shown. Each of these candidates has a data transmission time of 1,
There are five candidates for 2, 4, 6, and 8 hours, four candidates for data transmission rates of 25, 50, 100, and 200 Mbps, and three candidates for data quality A, B, and C described above.

Next, the operation of the data transmission system according to the first embodiment of the present invention will be described.

First, the user of the terminal devices 6a, 6b and / or 6c selects one of the three conditions for determining the communication conditions, for example, selecting to receive data in a data transmission time of 4 hours. One of the conditions is selected, and this is instructed to the candidate condition display means 8a, 8b, or 8c. The candidate condition display means 8a, 8b, or 8c accepts the designated one condition, and sets the It instructs the communication management means 4 via the communication management means 4.

Next, the communication management means 4 receives one condition from the candidate condition display means 8a, 8b and / or 8c, and transmits information on the use condition of the transmission line 5 and the use condition of the transmission device 1. With consideration, the terminal devices 6a, 6b and / or 6
c is a menu of communication condition candidates that can be actually instructed to the transmitting device 1, that is, the transmitting device 1
A menu of candidates for communication conditions of data that can be transmitted to b and / or 6c is extracted from the menus that communication condition receiving means 2 has in advance, and presented to terminal devices 6a, 6b and / or 6c. I do. For example,
When the communication management means 4 receives one condition from the candidate condition display means 8a, the data transmission means 3 of the transmission device 1 transmits data at a transmission rate of 300 Mbps together with the terminal devices 6b and 6c. If so, the transmission path 5
Can transmit data at a transmission rate of up to 400 Mbps, and the data transmitting means 3 of the transmitting device 1
Since data can be transmitted at a transmission rate of up to 350 Mbps, the communication management means 4 requires that the amount of information that the transmitting device 1 can transmit to the terminal device 6a per second is 5
It is determined that the information amount is up to 0M bits, and the following (1)
From the four candidates (4). The four candidates are (1) a data transmission time of 4 hours and a data transmission speed of 5 hours.
0 Mbps and data quality A, (2) data transmission time of 4 hours, data transmission speed of 50 Mbps and data quality B, (3) data transmission time of 2 hours, data transmission speed of 50 Mbps and data quality C, (4) The candidates are a data transmission time of 4 hours, a data transmission speed of 25 Mbps, and a data quality C. For example, under the condition of (4), since the data quality is C, the quality of the video and / or sound is inferior to A, but the terminal device 6a reduces the amount of information and realizes 4 hours of real time. There is an advantage that data can be received.

Next, the candidate condition display means 8a, 8b or 8c of the terminal device 6a, 6b and / or 6c receives the information of the candidate such as the above-mentioned four candidates from the communication management means 4, and receives the information. Display a menu of suggestions.

After the candidate condition display means 8a, 8b and / or 8c display the menu, the terminal device 6
a, 6b and / or 6c selects one condition from among the displayed four communication condition candidates, for example, selects the communication condition (1), and selects the candidate condition. An instruction is given to the display means 8a, 8b or 8c, and the candidate condition display means 8a, 8b or 8c accepts the communication condition and gives an instruction to the transmitting device 1 via the transmitting / receiving means 7a, 7b or 7c.

Then, the communication condition receiving means 2 of the transmitting device 1
Receives the communication conditions from the terminal devices 6a, 6b and / or 6c, and the data transmission means 3 of the transmission device 1 converts the basic data held in advance into the terminal devices 6a, 6b and / or Or 6c.

Thereafter, the decoder 9a, 9b or 9c of the terminal device 6a, 6b and / or 6c
Transmits the data transmitted by the transmitting / receiving means 7a, 7b or 7c.
And play the video and / or sound of the movie based on that data, such as a 2 hour movie.

In the first embodiment, the terminal device 6a,
Although the user of 6b and / or 6c selects two of the three conditions for determining the communication conditions and instructs the communication management means 4 through the transmission / reception means 7a, 7b or 7c, One of the three conditions for determining the condition may be selected by the transmitting device 1 in advance. In this case, the communication management unit 4 considers the communication conditions preliminarily selected by the transmission device 1 and displays a menu of communication condition candidates that can be instructed to the transmission device 1 by each of the terminal devices 6a, 6b, and 6c. It may be presented on the device 6a, 6b or 6c. Alternatively, as for the communication condition, the user of each of the terminal devices 6a, 6b and 6c instructs one condition to the communication management means 4 via the transmitting / receiving means 7a, 7b or 7c, and the transmitting device 1
The communication conditions may be determined by selecting the remaining conditions in consideration of the two conditions.

In the first embodiment, the data transmitting means 3 can transmit data at a transmission speed of up to 350 Mbps. However, the transmission speed of the data transmitting means 3 is not limited to 350 Mbps. Although the transmission path 5 can transmit and receive information at a transmission rate of up to 400 Mbps, the transmission rate of the transmission path 5 is 40 Mbps.
It is not limited to 0 Mbps. Furthermore, the number of bits of the digital signal comprising the basic data, the main component, the subcomponent, and the auxiliary component is specified. Can be any number of bits. In short, the communication management means 4 comprises the maximum transmission speed at which the data transmission means 3 of the transmission device 1 can transmit data, the maximum transmission speed at which the transmission line 5 can transmit and receive, and basic data. In consideration of the number of bits of the digital signal being used, a menu of data communication condition candidates that can be received by the terminal devices 6a, 6b and / or 6c is presented to the terminal devices 6a, 6b and / or 6c. And the terminal devices 6a, 6b and / or 6
The user of c may select the communication condition from the menu, and the transmitting device 1 only needs to transmit data based on the communication condition to the terminal devices 6a, 6b and / or 6c.

Embodiment 2 First, the configuration of a data transmission system according to Embodiment 2 of the present invention will be described.

FIG. 2 shows a block diagram of a data transmission system according to the second embodiment of the present invention.

The data transmission system according to the second embodiment of the present invention comprises a broadcasting device 10, a transmission line 5, and terminal devices 6a and 6b.
And 6c.

The broadcasting device 10 is a device that broadcasts data having substantially the same contents, for example, two-hour movie data as described in the first embodiment, as a plurality of programs under different communication conditions. . The communication conditions refer to the first embodiment.
The data transmission time, the data transmission speed, and the data quality are determined by any two of the three conditions described above. That is, the broadcasting device 10 transmits data having substantially the same contents, for example, a data transmission time of 4 hours and a data transmission time of 4 hours, as the communication condition receiving means 2 of the transmission device 1 of the first embodiment has a menu. Speed 50Mb
The device has a menu of a plurality of programs based on different communication conditions such as ps and data quality A, and unidirectionally broadcasts the menu and the plurality of programs.

The transmission path 5 is a transmission / reception path for a plurality of programs broadcast by the broadcasting device 10.

The terminal device 6a comprises a transmitting / receiving means 7a, a candidate condition display means 8a, and a decoder 9a.
The transmission / reception unit 7a is configured such that the broadcasting device 10 broadcasts unilaterally,
A plurality of programs and menus based on different communication conditions are received, an instruction of a program to be actually reproduced by the terminal device 6a among the plurality of programs is received from the candidate condition display means 8a, and data of the received programs is decoded. 9a. The candidate condition display means 8a receives the menu from the broadcasting device 10 via the transmission / reception means 7a, displays the menu, and receives a message from the user of the terminal device 6a from among a plurality of programs of the displayed menu. , Receiving the selection of the program requested by the user, and instructing the transmitting / receiving means 7a of the received program. Decoder 9a
Is a means for receiving data of a program based on an instruction of the candidate condition display means 8a from the transmission / reception means 7a and reproducing the program.

Similarly, the terminal device 6b is connected to the transmitting / receiving means 7b
, A candidate condition display means 8b, and a decoder 9b. The terminal device 6c includes a transmission / reception means 7c, a candidate condition display means 8c, and a decoder 9c. Each of the transmission / reception means 7b and 7c receives a plurality of programs and menus based on different communication conditions unilaterally broadcast by the broadcasting device 10, and displays the candidate condition display means 8b or 8c.
c, the terminal device 6b or 6c of the plurality of programs receives an instruction for a program to be actually reproduced, and transmits data of the received program to the decoder 9b or 9c. In addition, each of the candidate condition display means 8b and 8c receives a menu of a plurality of programs from the broadcasting device 10, displays the menu, and receives from the user of the terminal device 6b or 6c a message of the plurality of displayed programs. Among these, it is means for accepting selection of a program requested by the user and instructing the accepted program to the transmitting / receiving means 7b or 7c. Further, each of the decoders 9b and 9c
From the transmission / reception means 7b or 7c, the candidate condition display means 8b
Or means for receiving program data based on the instruction of 8c and reproducing the program.

Next, the operation of the data transmission system according to the second embodiment of the present invention will be described.

First, the broadcasting device 10 unilaterally broadcasts a plurality of programs and menus having substantially the same contents as described above.

On the other hand, each of the candidate condition display means 8a, 8b or 8c of the terminal device 6a, 6b or 6c receives the broadcast device 1 via the transmission / reception means 7a, 7b or 7c.
Receive and display the menu from 0.

Next, the user of each of the terminal devices 6a, 6b and 6c checks the candidate condition display means 8a, 8b or 8c.
The user selects a requested program from the menu displayed in the above section and instructs the transmitting / receiving means 7a, 7b or 7c via the candidate condition display means 8a, 8b or 8c.

The transmitting / receiving means 7a, 7b and 7c
Each of them converts the data of the designated program into a decoder 9a,
9b or 9c, and each of the decoders 9a, 9b or 9c receives the data of the designated program and reproduces the program.

The broadcasting device 1 according to the second embodiment of the present invention
0 may previously hold a plurality of programs that can broadcast data of substantially the same contents under different communication conditions, or hold only basic data as in the transmission device of the first embodiment. Means may be provided for transmitting the data based on the communication conditions so that the basic data can be broadcast as a plurality of programs under different communication conditions.

An example of a method for reproducing data by the decoders 9a, 9b and 9c of the terminal devices 6a, 6b and 6c of the present invention is as follows. For example, when the data to be reproduced is composed of a plurality of sets of digital signals each including a main component, a sub component, and an auxiliary component as in the basic data of the first embodiment, the decoder 9a, 9b or 9c, when reproducing only the data of the main component, reproduce the image and / or sound with reduced quality, and when reproducing the data of the main component and the sub-component, the data of the main component alone is When the reproduced quality video is enlarged, the quality of the video and / or sound is not good, as shown in FIG. The component data is corrected by the component data, and as shown in FIG.
Play with enhanced video and / or sound quality, such that stairs appear as straight lines,
In addition, when reproducing the data of all of the main component, the sub-component, and the auxiliary component, if the quality of the video in which the data of the main component and the sub-component is reproduced is further enlarged, as shown in FIG. For example, since the quality of video and / or sound is still not good so that one straight line is displayed in a stepped manner, the data of the auxiliary component is corrected to the data of the main component and the sub component, and FIG. As shown in b-2), the video and / or sound quality is further improved and reproduced so that the stair-like display is displayed as a straight line.

Further, the decoders 9a, 9b and 9c of the terminal devices 6a, 6b and 6c of the present invention may temporarily store the received data and decode and reproduce the data later. For example, the decoders 9a, 9b and 9c
When a large amount of data is received in a short time at a high transmission rate, the decoders 9a, 9b, and 9c have an advantage that the data can be reproduced in real time or at a staggered time.

Further, the number of terminal devices of the present invention is not limited to three, and the communication management means 4 of the present invention may be provided in the transmitting device 1.

The data of the present invention is not limited to data relating to video and sound, but may be, for example, data of a program for activating a word processor. However, in the transmission of the program data, the conditions of the transmission time and the transmission speed may be any conditions, but it is not allowed to change the information amount.

In the first embodiment, there are five candidates for data transmission time, four candidates for data transmission speed, and three candidates for data quality. However, the communication conditions of the present invention are determined. The number of candidates for the underlying data transmission time, transmission rate, and quality is not limited to the number described above.

In the first embodiment, the basic data is
Although it is assumed that there are three levels of data quality, which are composed of a main component, a sub component, and an auxiliary component, in the present invention, the basic data is data that can change the screen size, resolution, compression ratio, and the like. Thus, the data quality only needs to be the quality of data having substantially the same contents and composed of different data amounts.

Further, in the data transmission system of the present invention, for example, in the transmission of substantially the same data, the price of data transmitted at data quality A is reduced by the price of data transmitted at data quality B or C. Higher or
In addition, communication conditions and the price of data, such as making the price of data when transmitting at a high transmission rate in a short time higher than the price of data when transmitting at a low transmission rate over a long time at night, are higher. May be related.

[0057]

As is apparent from the above description, the present invention selects a condition of transmission speed, transmission time, quality and / or price of data transmitted by a transmitting device or a broadcasting device, and selects the condition. A terminal device capable of requesting the transmission device to transmit data based on the conditions,
A transmitting device that can transmit data based on the condition selected by the terminal device, and if the transmitting device or the broadcasting device and the transmission path have room to transmit the data, the transmitting device or the broadcasting device , A data transmission system and a data broadcasting system capable of transmitting data.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data transmission system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a data broadcasting system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram when a decoder of the terminal device of the present invention reproduces data.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission device 2 communication condition receiving means 3 data transmission means 4 communication management means 5 transmission path 6 a, 6 b, 6 c terminal device 7 a, 7 b, 7 c transmission / reception means 8 a, 8 b, 8 c candidate condition display means 9 a, 9 b, 9 c decoder 10 broadcast apparatus

Claims (5)

[Claims] 1. A transmitting device for transmitting requested data based on a predetermined communication condition, and one or more transmitting devices for requesting the transmitting device to transmit the data and receiving the data transmitted by the transmitting device. A data transmission system, comprising: a terminal device, wherein the communication condition is determined based on an instruction from the terminal device. 2. The communication condition is determined by any two of three conditions of a data transmission time, a data transmission speed and a data quality, and both or one of the two conditions is determined by the terminal. 2. The data transmission system according to claim 1, wherein an instruction is issued from an apparatus to the transmission apparatus. 3. The method according to claim 1, wherein when only one of the two conditions is instructed from the terminal device, the remaining one condition is predetermined or determined by the transmitting device. Item 3. The data transmission system according to Item 2. And managing a use state of a transmission path used for transmitting the data and / or a use state of the transmission device.
Communication management means for creating a candidate for a condition that can be specified by the terminal device in consideration of the information on the use status; and the terminal device has a candidate condition display means for displaying the candidate for the condition that can be specified. The data transmission system according to any one of claims 1 to 3, wherein: 5. A broadcast apparatus for broadcasting data having substantially the same contents as a plurality of programs under different communication conditions, and selecting and receiving any one of the plurality of programs broadcasted by the broadcast apparatus. A data broadcasting system comprising a plurality of terminal devices.