JP2003264767A - Data reproduction apparatus and data reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize a moving image distribution service or the like for a long period of time by reducing the consumption of battery power by appropriate operation limitation corresponding to the data structure of multimedia data in a battery-driven portable terminal. <P>SOLUTION: A data reproduction apparatus is provided with a reception part 11 for receiving the encoded data Md of the multimedia data, a decoding part 13 for decoding the received encoded data, and a video/sound output part 14 for displaying images or outputting sound on the basis of the decoded multimedia data. One or more of the operations of the reception part 11, the decoding part 13 and the video/sound output part 14 are limited corresponding to the data structure of the inputted multimedia encoded data and the setting by a user so as to suppress the consumption of the battery power Bp by the respective parts 11, 13 and 14. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reproducing device and a data reproducing method, and more particularly to a process for reproducing encoded data of multimedia data so that power consumption in a battery-powered data reproducing terminal is reduced. is there.

[0002]

2. Description of the Related Art In recent years, with the progress of video / audio data compression technology, it has become possible to distribute moving images on the Internet. In addition, the standard for video distribution to wireless terminals
TS26.234 (Transparent end-to-end packet switched s
It is expected that the information distribution service on mobile terminals will become widespread in the future, such as the provision of "treaming service". The above-mentioned standard TS26.234 is 3GPP (Third Third) which is an international standardization organization that defines the standard of receiving terminals in a wireless communication network.
Generation Partnership Project).
Further, in the information distribution service, so-called multimedia data including data such as moving images, still images, voices and characters is distributed.

FIG. 19 is a block diagram for explaining a conventional data reproducing apparatus. Data reproducing device 10 shown in FIG.
0 denotes a data reproducing unit 110 that receives and reproduces a multimedia data stream (hereinafter, also referred to as multimedia encoded data or encoded data) Md obtained by encoding multimedia data, and a battery as a power source. The mobile terminal includes a power supply unit 105 that is installed and that supplies the battery reproduction power to the data reproduction unit 110.

The data reproducing unit 110 receives the multimedia encoded data Md, a receiving unit 101, a memory 102 for temporarily storing the output (received encoded data) RMd of the receiving unit 101, and A decoding unit 103 that decodes the encoded data RMd read from the memory 102 and outputs the decoded data Dd, and a video that outputs a video (displays an image) or outputs an audio based on the decoded data Dd from the decoding unit 103. The audio output unit 104 is included.

Here, the respective units 101 to 104 constituting the data reproducing unit 110 perform data processing by the electric power supplied from the battery 105. The video / audio output unit 104 includes, for example, an audio output unit (not shown) including a speaker and the like, a display unit (not shown) such as a liquid crystal monitor for displaying an image, and the like.

Next, the operation will be described. In the data reproducing device 100, each of the units 101 to 104 that constitute the data reproducing unit 110 operates by the power of the battery supplied from the power supply unit 105.

When the multimedia encoded data Md transmitted from the server S is input to the data reproducing apparatus 100, the data reproducing unit 110 causes the power supply unit 10 to operate.
A reproduction process for the multimedia coded data Md is performed by the power of the battery supplied from 5.

Specifically, the receiving unit 101 receives the encoded data Md from the server, and the received encoded data RMd is stored in the memory 102. Decoding unit 103
Is the encoded data RM read from the memory 102.
Decode d to output decrypted data Dd. Then, the video / audio output unit 104 performs audio output or image display based on the decoded data, that is, the multimedia data Dd obtained by decoding the encoded data RMd.

However, a reproduction process of encoded multimedia data, that is, a process of receiving and decoding encoded multimedia data and further outputting a sound or displaying an image based on the multimedia data obtained by the decoding Then, compared to displaying only character data,
A large amount of electric power is required, and the above-described battery-driven data reproducing device (portable terminal) has a problem that the battery must be frequently charged when multimedia data reproducing processing is performed.

Therefore, in a battery-driven reproducing terminal or the like, for example, a device for controlling the data reproducing operation in accordance with the output voltage of the battery so as to suppress the consumption of battery power is considered. -1643
Japanese Patent Publication No. 21 discloses an image decoding device for decoding a compressed image signal, which switches the display mode from a color display mode to a monochrome display mode when the power supply voltage drops below a certain level.

[0011]

[Patent Document 1] JP-A-11-164321

[0012]

However, in the method of controlling the data reproducing device according to the output voltage of the battery as described above, when the output voltage of the battery decreases, the display mode is switched so that the power consumption is suppressed. Therefore, even if the data is important to the user, the quality of reproduction deteriorates. Also, if the output voltage of the battery is at a normal level, even if the data is not important,
There is a problem that the high-quality data reproduction process is performed more than necessary, which wastes battery power.

The present invention has been made to solve the above-mentioned problems, and when receiving multimedia encoded data and decoding and reproducing the encoded data, the contents of the reproduced data are changed. Accordingly, it is an object of the present invention to provide a data reproducing apparatus and a data reproducing method that can appropriately reduce power consumption, and thereby can use a moving image distribution service for a long time by supplying power from a battery.

[0014]

A data reproducing device according to the present invention (claim 1) is a data reproducing device which operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data. And a decoding unit that decodes the received encoded data and outputs the decoded data, and a video / audio output unit that outputs video and audio based on the decoded data. When,
And a control unit for restricting the operation of the receiving unit to receive only part of the encoded data according to the data structure of the encoded data.

According to a second aspect of the present invention, in the data reproducing apparatus according to the first aspect, the control unit limits the operation of the receiving unit by encoding the video coded data and the audio code included in the coded data. It is characterized in that only one of the converted data is received.

A data reproducing apparatus according to the present invention (claim 3) is a data reproducing apparatus which operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data. A transmitting unit that transmits a command requesting data to a terminal on the network, a receiving unit that receives encoded data transmitted from the terminal in response to the instruction, and a decoded data that decodes the received encoded data. , A video / audio output unit for outputting video and audio based on the decoded data, and an operation of the transmission unit, according to the attribute of the multimedia data,
And a control unit for controlling to transmit an instruction requesting only a part of the encoded data.

According to a fourth aspect of the present invention, in the data reproducing apparatus according to the third aspect, the transmission section is included in the encoded data under the control of the control section according to the attribute of the multimedia data. It is characterized by transmitting an instruction requesting only one of the encoded video data and the encoded audio data.

A data reproducing apparatus according to the present invention (Claim 5) is a data reproducing apparatus which operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data. A receiver for receiving the data, a decoder for decoding the received encoded data and outputting the decoded data, a video / audio output unit for outputting video and audio based on the decoded data, the receiver, And a control unit for limiting one or more operations of the decoding unit and the video / audio output unit so as to suppress the consumption of the battery power according to the attribute of the multimedia data. is there.

According to the present invention (claim 6), in the data reproducing device according to claim 5, a message exchanging unit for exchanging a message with a terminal on a network for acquiring related data related to the multimedia data. And a related data acquisition unit that acquires related data transmitted from a terminal on the network, and the control unit includes:
The operation is limited based on the attribute of the multimedia data indicated by the related data.

According to a seventh aspect of the present invention, in the data reproducing apparatus according to the sixth aspect, the data reproducing section further comprises a data accumulating section for accumulating the received encoded data.
The data storage unit is controlled to store only a part of the encoded data based on the related data.

According to the present invention (claim 8), in the data reproducing apparatus according to claim 7, the control part controls the data storage part by encoding the video coded data and the audio coded data included in the coded data. It is characterized in that only one of the data is stored.

According to the present invention (claim 9), in the data reproducing apparatus according to claim 5, the related data indicating the attribute of the multimedia data and the preference data indicating the user's preference are exchanged with the terminal on the network. A message exchange unit for exchanging messages to be acquired, a related data acquisition unit for acquiring related data transmitted from the terminal on the network, and a preference data acquisition unit for acquiring preference data transmitted from the terminal on the network And a determination unit that determines the importance of the received encoded data based on the related data and the preference data, and the control unit determines the importance of the encoded data determined by the determination unit. The above-mentioned operation is limited based on the degree.

According to a tenth aspect of the present invention, in the data reproducing apparatus according to the ninth aspect, a data storage unit for storing the received encoded data is further provided, and the control unit includes the data storage unit. Based on the importance of the encoded data determined by the determination unit, control is performed so that only a part of the encoded data is stored.

According to the present invention (claim 11), in the data reproducing apparatus according to claim 5, the control section controls the operation according to the remaining amount of the battery power. is there.

According to a twelfth aspect of the present invention, in the data reproducing apparatus according to the fifth aspect, the video / audio output section displays an image based on the decoded data, and the control section controls the video. The operation of the audio output unit is limited so that the brightness level at the time of displaying the image is limited.

According to the present invention (claim 13), in the data reproducing apparatus according to claim 5, the control section decodes data for a part of frames of the coded video data included in the coded data. It is characterized in that the above operation is restricted so as to output.

According to the present invention (claim 14), in the data reproducing apparatus according to claim 5, the control unit is any one of video coded data and audio coded data included in the coded data. It is characterized in that the above-mentioned operation is restricted so that only the above is received, decoded and output.

According to the present invention (claim 15), in the data reproducing apparatus according to claim 5, the control section decodes only the high-priority data of the encoded data based on the attribute of the multimedia. , Or output is limited.

According to the present invention (claim 16), in the data reproducing apparatus according to claim 5, the encoded data is obtained by hierarchically encoding the multimedia data by dividing the multimedia data into a basic layer and an additional layer. Characterized in that the control section limits the operation so as to receive, decode, or output only the data corresponding to the base layer of the coded data. Is.

According to a seventeenth aspect of the present invention, in the data reproducing apparatus according to the sixteenth aspect, the apparatus further comprises a data storage unit for storing the received encoded data, and the control unit includes the data storage unit. Based on the attribute of the multimedia, the encoding data is controlled so that only the encoded data corresponding to the base layer is stored.

A data reproducing method according to the present invention (claim 18) is a data reproducing method for receiving and reproducing encoded data of multimedia data by electric power supplied from a battery. A receiving step of receiving, a decoding step of decoding the received encoded data to generate decoded data, and an audiovisual output step of outputting video and audio based on the decoded data,
And a control step of limiting one or more operations of the reception, the decoding, and the output according to the attribute of the multimedia data so as to suppress the consumption of the battery power.

According to the present invention (claim 19), in the data reproducing method according to claim 18, the related data indicating the attribute of the multimedia data and the preference data indicating the user's preference are exchanged with the terminal on the network. A message exchange step of exchanging messages to be acquired, a related data acquisition step of acquiring related data transmitted from the terminal on the network, and a preference data acquisition step of acquiring preference data transmitted from the terminal on the network And a determination step of determining the importance of the received encoded data based on the related data and the preference data, and the control step includes the importance of the encoded data determined by the determination step. One or more operations of receiving, decoding, and outputting are limited based on the degree It is intended to.

A program according to the present invention (claim 20) performs a process of receiving and reproducing encoded data of multimedia data by electric power supplied from a battery.
A program executed by a computer, the receiving step of receiving the coded data, the decoding step of decoding the received coded data to generate decoded data, and the output of video and audio based on the decoded data. And a control step of limiting one or more operations of the reception, the decoding, and the output so as to suppress the battery power consumption according to the attribute of the multimedia data. It is a feature.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. (Embodiment 1) FIG. 1 is a block diagram for explaining a data reproducing apparatus according to Embodiment 1 of the present invention.

The data reproducing apparatus 100a according to the first embodiment
Is a data reproduction process for receiving and reproducing a multimedia data stream (hereinafter also referred to as multimedia encoded data or encoded data) Md obtained by encoding multimedia data such as video, audio, and text. The data reproducing apparatus 100a is specifically configured to supply power from a battery.
It is an information terminal such as a PDA (Personal Digital Assistance) or a mobile phone capable of receiving a multimedia data stream. Here, it is assumed that the multimedia encoded data includes various additional information for data transmission such as header information, in addition to encoded data of contents such as video, audio, and text. The multimedia encoded data is composed of, for example, a packet storing encoded data of content and a packet storing the additional information. Further, the multimedia coded data may be multiplexed coded data in which coded data such as video coded data, audio coded data, and text coded data are multiplexed, but in the following,
The case where the multimedia coded data is not multiplex coded data will be mainly described.

That is, the data reproducing apparatus 100a according to the first embodiment is equipped with a data reproducing section 110a for receiving and reproducing the multimedia encoded data Md and a battery as a power source, and the data reproducing section 110a has a battery. And a power supply unit 16 that supplies the electric power Bp. The power supply unit 16 is the same as the power supply unit 105 of the conventional data reproducing device 100. Here, the battery mounted on the power supply unit 16 may not be rechargeable like a normal dry cell, or may be rechargeable.

The data reproducing section 110a of the data reproducing apparatus 100a performs the operation of receiving the encoded data Md from the server SA based on the control signal Ct11.
1 and the output of the receiving unit 11 (received encoded data) R
A memory 12 that temporarily stores Md and a decoding process that decodes the encoded data RMd read from the memory 12 and outputs the decoded data (multimedia data) Dd are performed based on the control signal Ct13. Decoding unit 13 and decoded data (multimedia data) D from the decoding unit 13
In accordance with d, a playback operation for performing video output or audio output such as image display is performed based on the control signal Ct14, and a control message such as a request for transmitting content (multimedia encoded data) to the server SA. The session management unit 26 exchanges Smd and Rmd on the basis of the control signal Ct26. When the receiving unit 11 receives, as the multimedia coded data, multiplex coded data in which audio coded data, video coded data, and text coded data are multiplexed, the multiplex code is received. Audio encoded data, video encoded data, and text encoded data are separated from the encoded data and output.

The data reproducing unit 110a outputs the operation signal Sop by a user operation, and the operation signal Sop from the input unit 24 and the data structure of the input multimedia encoded data Md. A reproduction control unit 1 that restricts at least one operation of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 so as to suppress the power consumption of the battery power supply unit 16.
5a and.

Here, the receiving unit 11 may receive the multimedia coded data Md via a wireless communication path or may receive the multimedia coded data Md via a wired communication path. It may be. Also,
The video / audio output unit 14 is the same as the conventional data reproducing apparatus 10.
Similar to the video / audio output unit 104 of 0, for example, it has an audio output unit (not shown) including a speaker and the like, a display unit (not shown) such as a liquid crystal monitor for displaying an image, and the like.

The operation control section 15a sets a restriction mode for restricting operation and a non-restriction mode for not restricting operation according to the operation signal Sop from the input section 24. In the set state, according to the data structure of the encoded data Md, the input unit 2
The above-mentioned units 11, 13 and 14 are controlled so that various operation restriction processes specified by the operation signal Sop from the control unit 4 are performed. For example, the operation of the receiving unit 11 may not be restricted depending on the structure of the input encoded data.

Specifically, RTP (Real Time Streamin)
When using the g Protocol), it is possible to identify whether the data included in the packet is video data or audio data by the identification information included in the received packet, so that the receiving operation can be limited. On the other hand, HTT
When downloading multiplexed data (file data) in which video and audio data are multiplexed by using P (Hyper Text Transfer Protocol), the receiving unit 11 extracts the video data and the audio data. Since they cannot be separated, the reception operation cannot be restricted.

In this case, the operation control unit 15a limits the operation of one or both of the decoding unit 13 and the video / audio output unit 14 to the operation of the type specified by the operation signal Sop from the input unit 24. Make restrictions.

However, in the reproduction control unit 15a, the data structure of the input encoded data Md is the same as that of the reception unit 11,
Even when the operations of the decoding unit 13 and the video / audio output unit 14 can be limited, the operation signal Sop
One of the parts 11, 13, and 14 depending on
One or two operations may be limited.

Here, whether or not the operation of the receiving unit 11 can be restricted is determined by the reproduction control unit 15a based on the packet identifier in the input encoded data Md. It should be noted that whether or not the operation of the receiving unit 11 can be restricted depends on, for example, when the multimedia encoded data is multiplexed data (file data), header information included in the file data when receiving the multiplexed data. Is determined by. When the file data is downloaded using the HTTP protocol, whether or not the operation of the receiving unit 11 can be restricted may be determined using HTTP header information.

The specific processing of the operation restriction that can be specified by the user operation on the input unit 24 will be described below in detail. Here, in the specific processing of the above-mentioned operation restriction, 4
One limiting process, that is, a process of limiting the brightness level when displaying an image (first action limiting process), a process of limiting a frame to be played (second action limiting process), and playing only one of audio and video. Processing (third operation restriction processing),
A process of reproducing only data corresponding to the base layer (fourth operation restriction process) is used for the multimedia data that has been subjected to the hierarchical encoding process.
The fourth operation restriction process will be briefly described. The hierarchical encoding process for the multimedia data is a process for dividing the multimedia data into data corresponding to the basic layer and data corresponding to the additional layer and hierarchically encoding the data.

(1) First Operation Limiting Process (Limitation of Luminance Level) In the first operation limiting process, the luminance level at the time of image display on the video / audio output unit 14 is lower than the luminance level at the time of non-limitation. It is a level. Specifically, in this process, the reproduction control unit 15a controls the video / audio output unit 14 by the control signal Ct14 so that the brightness level of the image display becomes the limited brightness level. ,
Consumption of battery power supplied from the power supply unit 16 is suppressed.

Here, the limited luminance level is not particularly limited, and may be, for example, the luminance level in the limited mode which is set in advance as a default value of the data reproducing device, or is input by a user operation. Part 2
The brightness level input from 4 may be used. The specific brightness level in the limited mode may be, for example, a half level of the brightness level in the non-limited mode, or a 0 level at which no image is displayed.

(2) Second operation restriction processing (frame restriction) The second operation restriction processing is the decoding processing of the encoded data in the decoding section 13 or the reproduction of the decoded data in the video / audio output section 14. The processing is limited to a predetermined frame. Specifically, when the second operation restriction process is performed, the reproduction control unit 15a controls the decoding unit 13 to perform only the decoding process for a predetermined frame, or the video / audio output unit 14 Is controlled so that only the reproduction operation for a predetermined frame is performed. Here, which operation of the decoding unit 13 and the video / audio output unit 14 the control unit 15a controls is determined according to the user setting. However, which operation of the decoding unit 13 and the video / audio output unit 14 the reproduction control unit 15a controls may be uniquely set in the terminal.

Various cases can be considered as to which frame is selected as the predetermined frame to be reproduced in the restricted mode. For example, MPEG-compliant moving image data includes I frame, B frame, and P frame.
Although the data corresponding to the frame is included, in the restricted mode, only the encoded data corresponding to the I frame is decoded and reproduced, so that the displayed image becomes a little rough, but the power consumption from the battery is suppressed. be able to. The process of limiting the frames to be reproduced to the predetermined frames is not limited to the method of selecting from the I, P, and B frames, and the frame to be reproduced is not limited to the plurality of frames forming the moving image. Other methods of selecting frames to be reproduced may be used as long as they are limited to a part of the frames.

(3) Third operation limiting process (only one of audio and video is output) The third operation limiting process is to receive data in the receiving unit, decode data in the decoding unit 13, or output video / audio. Part 14
The output of the data in 1 is limited to one of audio and video. Specifically, when the third operation restriction process is performed, the reproduction control unit 15 determines whether one of the video coded data and the audio coded data included in the multimedia coded data. The operation of any one of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 is limited so that only the data is reproduced. By limiting the data to be reproduced to either audio data or video data in this way, power consumption from the battery can be suppressed as compared with the case of reproducing both video and audio.

(4) Fourth Operation Limiting Process (Limitation when Multimedia is Hierarchically Coded) Multimedia coded data may be obtained by hierarchical coding of multimedia data. . In such a case, the fourth motion restriction process can be used.

For example, when the multimedia data represents a moving image, the moving image is composed of a plurality of frames. As an example of hierarchical encoding for such multimedia data, data of a selected frame among a plurality of frames forming a moving image is encoded as data corresponding to a base layer, and the rest other than the selected one is encoded. There is one that encodes the frame of as the data corresponding to the additional layer to the base layer. The frame corresponding to the basic layer is, for example, a plurality of frames forming the moving image selected every 9 frames, and the frames other than the selected frame are frames corresponding to the additional layer.

When the multimedia data represents a composite image in which the foreground image is superimposed on the background image, for example, in the hierarchical encoding process for the multimedia data, the data corresponding to the background image is the base layer. And the data corresponding to the foreground image is encoded as the data corresponding to the additional layer with respect to the basic layer. Here, specifically, the background image is a landscape image, and the foreground image is an image of a person moving in front of the background image.

Then, in the fourth operation restriction process, the reproduction controller 15a reproduces only the encoded data corresponding to the basic layer included in the multimedia encoded data.
The operation of any one of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 is restricted. When such an operation restriction is performed, the quality of reproduced video and the like deteriorates, but the power consumption from the battery can be suppressed.

Further, the above-mentioned first to fourth operation restriction processing are
You may carry out combining some. For example, the operation of the data reproducing apparatus in the restriction mode is a combination of the first operation restriction process and the second operation restriction process, that is, I
It is also possible to decode only the frame data and display the image of the I frame at a luminance level that is half the normal luminance level.

The operation of the data reproduction apparatus in the restriction mode is a combination of the second operation restriction processing and the third operation restriction processing, that is, only the I frame data in the video data is decoded and reproduced, The sound may not be reproduced.

The operation of the data reproducing apparatus in the restriction mode is a combination of the first operation restriction processing and the fourth operation restriction processing, that is, only the data corresponding to the background image of the composite image is decoded and the background The image may be displayed at a luminance level that is half the normal luminance level.

The operation of the data reproducing apparatus in the restriction mode is a combination of the first operation restriction processing, the second operation restriction processing, and the fourth operation restriction processing, that is, I of the background image of the composite image. Only the data corresponding to the frame may be decoded and the background image may be displayed at a luminance level that is half the normal luminance level.

Next, the operation will be described. In the data reproducing apparatus 100a according to the first embodiment, each of the units 11 to 14, 15a, 24 and 2 which constitute the data reproducing unit 110a.
6 operates by the electric power Bp of the battery supplied from the power supply unit 16.

Further, in the data reproducing apparatus 100a of the first embodiment, the user sets one of the limited mode and the non-limited mode as the operation mode. When the restriction mode is set, the above 4
The user sets which of the two motion restriction processes should be performed.

Specifically, when the user operates the input section 24 to set the operation mode and the specific operation restriction process, the operation signal Sop corresponding to the user operation is output from the input section 24. The data is output to the reproduction control unit 15a, and the reproduction control unit 15a determines the operation mode of the data reproduction device 100a. That is, the reproduction control unit 15a sets the operation mode of the data reproduction apparatus 100a to one of the limited mode and the non-restricted mode according to the operation signal Sop, and further, when the operation mode of the data reproduction apparatus 100a is set to the limited mode. In accordance with the operation signal Sop, at least one of the above-mentioned four operation restriction processes is executed.
Let's do it.

When the user operates the input unit 24 to obtain the encoded data of the predetermined content (multimedia data), the operation signal Sop corresponding to the operation is input from the input unit 24. Is the playback controller 15
is output to a. Then, the reproduction control unit 15a controls the session management unit 26 to acquire the multimedia encoded data by the control signal Ct26.

That is, the session management unit 26, based on the control signal Ct26, sends the content request message (GE
T http://www.news.net/sport.mp4) Smd server S
It is transmitted to A (time T = ta1). This request message S
When the md is received by the server SA, the server SA receives the response message (HTTP / HTTP /
1.1 200 OK) Rmd playback terminal (data playback device) 10
0a (time T = ta2), and then the multimedia encoded data Md is transmitted to the reproduction terminal (data reproduction device) 100a (time T = ta3).

The data reproducing apparatus 100a is a server SA
When the multimedia coded data Md transmitted from is received, the multimedia coded data Md is reproduced according to the operation mode set by the user.

The data reproducing operation of the data reproducing apparatus 100a will be described in detail below. First, the case where the operation mode of the data reproducing apparatus 100a is the non-restricted mode will be described. In this case, the same operation as that of the conventional data reproducing apparatus 100 is performed.

That is, when the multimedia encoded data Md is transmitted from the server SA to the data reproducing apparatus 100a, the data reproducing section 110a reproduces the multimedia encoded data Md.

Specifically, the receiving unit 11 uses the server S
The multimedia encoded data (hereinafter also referred to as encoded data) Md from A is received, and the received encoded data RMd is stored in the memory 12. The decoding unit 13 decodes the encoded data RMd read from the memory 102 and outputs the decoded data Dd. Then, the video / audio output unit 14 performs audio output or image display based on the decoded data, that is, the decoded multimedia data Dd.

Next, the case where the operation mode of the data reproducing apparatus 100a is the restriction mode will be described. In this case, the server SA outputs the multimedia encoded data M.
When d is transmitted to the data reproducing device 100a, the data reproducing unit 110a causes the multimedia encoded data Md to be transmitted.
The multimedia encoded data Md is reproduced while the operations of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 are restricted according to the data structure of the above and the operation restriction process specified by the user. .

FIG. 2B shows a flow of processing for restricting the operation of each of the above-mentioned units, which is performed by the reproduction controller 15a of the data reproducing unit 110a. That is, the reproduction control unit 15a of the data reproduction unit 110a determines whether or not the operation of the receiving unit 11 can be restricted based on the data structure of the input multimedia encoded data Md and the operation restriction process set by the user. It is determined (step S1).

Specifically, in step S1, the reproduction controller 15a receives the input multimedia encoded data M.
Whether the data structure of d is such that the receiving unit 11 can distinguish the audio data from the video data, and the multimedia encoded data Md is hierarchically encoded. It is determined whether or not the data and the data of the additional layer can be distinguished. Also, in step S1,
The reproduction control unit 15a determines whether the operation restriction process specified by the user can be performed by the reception unit 11.

For example, the third operation restriction process (that is, the operation restriction process of receiving only one of the audio data and the video data) and the fourth operation restriction process (that is, the basic operation included in the hierarchically encoded multimedia data). The operation restriction process of receiving only layer data) can be performed by the receiving unit. On the other hand, the first operation restriction processing (brightness level restriction) and the second operation restriction processing (reproduction frame restriction) cannot be performed by the receiving unit 11.

Therefore, the data structure of the input multimedia encoded data Md is such that the receiving unit 11 can distinguish the audio data and the video data, and the user specifies the third operation restriction process. Or the multimedia encoded data Md is hierarchically encoded, the data of the basic layer and the data of the additional layer can be discriminated, and the fourth operation restriction process is designated by the user. Only in this case, the reproduction control unit 15a is not
It is determined that the operation of can be restricted. Then, the receiving unit 11
Based on the control signal Ct11 from the reproduction controller 15a,
The third motion restriction process or the fourth motion restriction process is performed (step S2).

On the other hand, when the reproduction control unit 15a determines that the operation of the receiving unit 11 cannot be limited, the reproduction control unit 1
5a determines whether or not the operation of the decryption unit 13 can be restricted based on the user's setting contents (step S3). For example, when the first operation restriction process for restricting the brightness level at the time of image display is specified as the specific operation restriction process in the restriction mode, the operation restriction for the decoding unit 13 is impossible. To be judged.

On the other hand, as the concrete operation restriction processing in the restriction mode, the second operation restriction processing for restricting the frame to be reproduced or the third operation restriction processing for reproducing only one of the audio and the video is designated. If so, it is determined that the operation restriction on the decoding unit 13 is possible.

When the fourth operation restriction processing for reproducing only the data corresponding to the basic layer of the hierarchically encoded multimedia data is specified as the specific operation restriction processing in the restriction mode, Whether or not the operation restriction for the decoding unit 13 is possible is determined depending on whether or not the input multimedia encoded data is hierarchically encoded. That is, when the input multimedia encoded data is hierarchically encoded, it is determined that the operation restriction on the decoding unit 13 is possible, and the input multimedia encoded data is the hierarchical encoded data. If not, it is determined that the operation restriction on the decoding unit 13 is impossible.

When the reproduction control unit 15a determines that the operation restriction on the decoding unit 13 is possible,
The decoding unit 13 receives the control signal Ct1 from the reproduction control unit 15a.
Based on 3, the at least one motion limiting process of the second to fourth motion limiting processes is performed (step S
4). On the other hand, when the reproduction control unit 15a determines that the operation of the decoding unit 13 cannot be restricted, the reproduction control unit 15a
Is based on the setting contents of the user.
It is determined whether or not the above operation can be restricted (step S5).

For example, as a concrete operation restriction process in the restriction mode, the first operation of restricting the brightness level at the time of image display
When the motion restriction process of No. 2, the second motion restriction process of restricting a frame to be reproduced, or the third motion restriction process of reproducing only one of audio and video is specified, the video / audio output unit 14 is operated. It is determined that the operation restriction is possible.

When the fourth operation restriction processing for reproducing only the data corresponding to the basic layer of the hierarchically encoded multimedia data is specified as the specific operation restriction processing, when the input multimedia is input. Whether or not the operation restriction on the video / audio output unit 14 is possible is determined depending on whether or not the media encoded data is hierarchically encoded. That is, when the input multimedia encoded data is hierarchically encoded, it is determined that the operation restriction on the video / audio output unit 14 is possible,
If the input multimedia encoded data is not hierarchically encoded, it is determined that the operation restriction on the video / audio output unit 14 is impossible.

Then, the reproduction control section 15a executes the specific operation restriction process designated by the user by the receiving section 1 described above.
When it is determined that neither the decoding unit 13, the decoding unit 13, or the video / audio output unit 14 can perform the process, the reproduction control unit 15a determines that the reception unit 11, the decoding unit 13, and the video / audio output unit 14 normally perform The control is performed so as to perform the operation in the non-restricted mode.

As described above, in the data reproducing apparatus 100a according to the first embodiment, the receiving unit 11 that receives the encoded data Md of the multimedia data, the decoding unit 13 that decodes the received encoded data, and the decoding unit 13 that decodes the received encoded data are decoded. And a video / audio output unit 14 for performing image display or audio output based on the multimedia data, so that the consumption of the battery power Bp in each of the units 11, 13, and 14 is suppressed. The receiving unit 11, the decoding unit 13, and the video / audio output unit 14 according to the data structure and the user setting.
Since one or more of the above operation restrictions are performed, the battery power consumption is reduced by the appropriate operation restriction according to the data structure of the multimedia data in the battery-powered portable terminal, and the reproduction of the multimedia data is performed. Is effective for a long time.

(Second Embodiment) FIG. 3 is a block diagram for explaining a data reproducing apparatus according to a second embodiment of the present invention. The data reproducing apparatus 100b of the second embodiment is similar to the data reproducing section 110a in place of the data reproducing section 110a of the data reproducing apparatus 100a of the first embodiment.
A multimedia data reproduction process is performed in either the restricted mode or the non-restricted mode, and the received multimedia encoded data RMd is provided with a data reproduction unit 110b that accumulates the encoded multimedia data RMd according to the remaining battery power and a user operation. It is a thing.

That is, the data reproducing unit 110b of the data reproducing apparatus 100b includes the receiving unit 11 that receives the encoded data Md from the server SA and the output RM of the receiving unit 11.
A memory 12 that temporarily stores d, and a decoding unit 13 that decodes the encoded data RMd read from the memory 12.
And a video / audio output unit 14 that displays an image or outputs sound according to the decoded data Dd from the decoding unit 13, a session management unit 26 that exchanges control messages Smd and Rmd to the server SA, and an operation according to a user operation. And an input unit 24 that outputs a signal Sop. Here, the receiving unit 11, the video / audio output unit 14, the session management unit 26, and the input unit 24 are exactly the same as those in the first embodiment.

Then, the data reproducing section 110b of the data reproducing apparatus 100b accumulates the coded data RMd temporarily recorded in the memory 12 as the data RMd2 based on the control signal Ct15, and at the same time, the control signal Ct.
A storage unit 25 that outputs the stored encoded data RMd2 as encoded data RMd3 to the decoding unit 13 based on 15, an operation signal Sop from the input unit 24, and a data structure of the input multimedia data stream Md. , And at least one operation of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 based on the battery monitor signal Mbp indicating the remaining amount of the battery power consumption of the power supplied from the battery power supply unit 16. The battery monitor signal Mb.
and a reproduction controller 15b for controlling the operation of accumulating the encoded data RMd2 from the memory 12 based on p and the user operation signal Sop from the input unit 24b.

Next, the operation will be described. In the data reproducing apparatus 100b according to the second embodiment, the process of accumulating the encoded data RMd2 stored in the memory 12 in the accumulating unit 25, and the encoded data RMd from the accumulating unit 25.
Data processing other than the processing of outputting 3 to the decoding unit 13 is performed in the same manner as in the first embodiment.

That is, in the data reproducing apparatus 100b of the second embodiment, the user sets one of the limited mode and the non-limited mode as the operation mode. When the restriction mode is set, the user further sets which of the four operation restriction processes shown in the first embodiment is to be executed.

When the content request message Smd is transmitted to the server SA in response to a user operation, the server SA outputs the encoded multimedia data Md following the response message Rmd to the request message Smd. (Data reproduction device) 100b.

The data reproducing apparatus 100b is the server SA
When the multimedia coded data Md transmitted from is received, the multimedia coded data Md is reproduced according to the operation mode set by the user.

First, when the operation mode of the data reproducing apparatus 100b is the non-restricted mode, the data reproducing apparatus 100b performs exactly the same operation as the conventional data reproducing apparatus 100.

If the operation mode of the data reproducing apparatus 100b is the restriction mode, the data reproducing section 110b
Is a storage unit based on the process of limiting the operations of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 as in the data reproducing unit 110a of the first embodiment, and the battery monitor signal Mbp and the user operation. 25 is the encoded data R
The multimedia encoded data Md is reproduced while performing the process of accumulating Md2.

FIG. 4 shows the flow of processing for restricting the operation of each of the above-mentioned units, which is performed by the reproduction control unit 15b of the data reproducing unit 110b. That is, the reproduction control unit 15b of the data reproduction unit 110b is the same as the data reproduction unit 110a of the first embodiment.
Similarly to the reproduction control unit 15a of the receiving unit 1, the receiving unit 1 based on the data structure of the input multimedia encoded data Md and the type of the operation restriction process set by the user.
It is determined whether the operation restriction for 1 is possible (step S1). When the reproduction control unit 15b determines that the operation of the reception unit 11 can be limited, the reproduction control unit 15b
Based on the control signal Ct11 from b, the receiving unit 11 performs the third motion limiting process or the fourth motion limiting process (step S2).

On the other hand, when the reproduction controller 15b determines that the operation of the receiver 11 cannot be limited, the reproduction controller 1b
5b determines whether or not the operation of the decoding unit 13 can be restricted based on the type of operation restriction processing designated by the user (step S3). The steps S1 to S performed in the data reproducing unit 110b of the second embodiment are performed.
The process of 3 is exactly the same as that of the first embodiment.

When the reproduction control unit 15b determines that the operation restriction on the decoding unit 13 is possible,
The reproduction control unit 15a performs at least one operation restriction process of the second to fourth operation restriction processes as the operation restriction process for the decoding unit 13 according to the control signal Ct13, and at the same time, stores the data stored in the memory 12. Is stored in the storage unit 25 according to the battery monitor signal Mbp and the user operation (step S4b).

Here, the operation of the decoding unit 13 includes not only the operation signal Sop from the input unit 24 and the data structure of the input multimedia encoded data Md but also the battery monitor signal Mbp indicating the remaining battery power. Is also based on. The operation of accumulating the data stored in the memory 12 in the accumulating section 25 is performed by the battery monitor signal M
bp and user operation.

That is, when the remaining amount of battery power is sufficient, the data decoding process in the decoding 13 is performed as in the first embodiment, and the operation limiting process for the decoding unit 13 is performed according to the operation mode. Be seen.

On the other hand, when the battery power is low and the encoded data of the received multimedia data (here, the audio data and the video data) cannot be reproduced to the end, the pop-up message shown in FIG. I) Mpu1 is displayed on the display unit (not shown) of the data reproduction device 100b, and the decoding unit 13 does not perform the decoding process of the encoded data, but the operation of accumulating the data in the accumulation unit 25 is performed.

When the remaining battery power is low and all the encoded data of the received multimedia data (here, audio data and video data) cannot be stored to the end, the pop-up message shown in FIG. I
I) Mpu2 is displayed on the display unit (not shown) of the data reproducing device 100b. Then, of the three storage methods indicated by the popup message (II) Mpu2,
The storage process for multimedia data is performed according to the storage method selected by the user.

That is, the first accumulation method by the user (1. Accumulate received video and audio data halfway)
When is selected, the received video and audio data is accumulated until the remaining amount of battery power reaches the limit value for battery driving.

When the user selects the second storage method (2. store the received video and audio data by reducing the bit rate until the end), the data size of the received encoded data and the time After the received encoded data is re-encoded at the bit rate according to the remaining battery level, the re-encoded data is accumulated.

Here, the bit rate at the time of storing the multimedia data is calculated by the following method. First,
The storable data size Sds is determined based on the remaining battery power.

Next, from the determined storable data size Sds and the reproduction time length Tply of the received content (multimedia data), the bit rate Brt at the time of storing the multimedia data is calculated by the following equation. Calculated in (1). Brt = Sds / Tply (1)

Here, since the bit rate Brt is for both video data and audio data, when the stream for audio data and the stream for video data are separately stored, this bit rate Brt is used.
Based on rt, the bit rate for audio data and the bit rate for video data are determined.

Also, when the multimedia data is MP4 file format data, the playback time length Tply is
It can be obtained by referring to the header area of the encoded data corresponding to the multimedia data.

When the user selects the third storage method (3. Do not store), the operation of storing data in the storage unit 25 is not performed. The storage method options are not limited to the above-mentioned three methods, and the storage method options include a method of storing only video data (related to sports) to the end and a method of storing only audio data to the end. May be included.

On the other hand, when the reproduction control unit 15b determines that the operation of the decoding unit 13 cannot be restricted, the reproduction control unit 1
5b determines whether or not the operation of the video / audio output unit 14 can be restricted based on the user's setting content (type of operation restriction processing) (step S5).

When the reproduction control unit 15b determines that the operation restriction on the video / audio output unit 14 is possible, the reproduction control unit 15b uses the control signal Ct14 to
As the operation restriction processing for the video / audio output unit 14, the operation restriction processing specified by the user is performed, and
The operation of storing the data stored in the memory 12 in the storage unit 25 is controlled according to the battery monitor signal Mbp and the user operation (step S6b).

Here, the operation of the video / audio output unit 14 is as follows.
The operation signal Sop from the input unit 24 and not only the data structure of the input multimedia data stream Md but also the battery monitor signal M indicating the remaining battery power.
It is also performed based on bp. The operation of accumulating the data stored in the memory 12 in the accumulating unit 25 is performed in the same manner as in step 4b according to the battery monitor signal Mbp and the user operation.

That is, when the remaining amount of battery power is sufficient, the data processing processing is performed in the video / audio output unit 1 as in the first embodiment, and the operation for the video / audio output unit 14 is performed according to the operation mode. Restriction processing is performed.

On the other hand, when the remaining battery power is low and the received multimedia coded data (here, audio coded data and video coded data) cannot be reproduced to the end, the pop-up shown in FIG. The message (I) Mpu1 is displayed on the display unit (not shown) of the data reproducing apparatus 100b, and the video / audio output unit 14 does not perform image display or audio output, and stores the encoded data in the storage unit 25. Is done.

If the remaining battery power is low and all the encoded data of the received multimedia encoded data (here, audio encoded data and video encoded data) cannot be stored up to the end, FIG. ) Popup message (II) Mpu2 shown in FIG.
0b is displayed on the display unit (not shown).

Then, the pop-up message (II) M
The multimedia coded data is accumulated by the accumulation method selected by the user among the three accumulation methods indicated by pu2.

When the reproduction control section 15b determines that the operation of the video / audio output section 14 cannot be restricted, that is, the specific operation restriction process designated by the user is executed.
The receiving unit 11, the decoding unit 13, and the video / audio output unit 14
If it is determined that it cannot be performed by any of the above, the reproduction control unit 15b determines that the receiving unit 11, the decoding unit 13,
Also, the video / audio output unit 14 controls to perform a normal operation, that is, an operation in the operation-unrestricted mode.

In this case, the reproduction controller 15b limits the operation of accumulating the data stored in the memory 12 in the accumulator 25 according to the battery monitor signal Mbp and the user operation (step S7b). This step S7
The operation restriction on the storage unit in step b is performed in step S4b
The same as in.

The coded data RMd2 accumulated in the accumulating section 25 is read out as the accumulated data RMd3 from the accumulating section 25 by the user operation after the battery is charged, and the read data is read by the decoding section 13. Decrypted,
The decoded data is reproduced by the video / audio output unit 14.

As described above, in the data reproducing apparatus 100b according to the second embodiment, the receiving unit 11 that receives the multimedia encoded data Md, the decoding unit 13 that decodes the received encoded data RMd, and the decoded data are decoded. A video / audio output unit 14 that performs image display or audio output based on the multimedia data, and a storage unit 25 that stores the received multimedia encoded data according to the remaining battery power and user operation, As in the first embodiment, one or more operations of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 are restricted, and the operation of accumulating the received data in the accumulating unit 25 is performed by using the battery power. Since it is controlled according to the remaining amount and user operation, power consumption can be effectively suppressed and battery distribution service etc. In addition to the effects it is possible to use time, in accordance with the remaining amount of battery power, the accumulation method desired by the user, leave accumulates the received data in the storage unit,
After the battery is charged, the accumulated data can be reproduced.

(Third Embodiment) FIG. 6 is a block diagram illustrating a data reproducing apparatus according to a third embodiment of the present invention.

Data reproducing apparatus 100 according to the third embodiment
In place of the data reproducing unit 110a of the data reproducing apparatus 100a according to the first embodiment, c is a data reproducing unit 110c that restricts an operation of reproducing multimedia encoded data based on related data related to the multimedia data. It is equipped with.

This data reproducing unit 110c, like the data reproducing unit 110a of the first embodiment, has a receiving unit 11, a memory 12, a decoding unit 13, a video / audio output unit 14, a session management unit 26, a reproduction control unit 15c, The input section 24 is provided, and the receiving section 11, the memory 12, the decoding section 13, the video / audio output section 14, the input section 24, and the session management section 2 are provided.
6 is the same as that of the first embodiment.

Further, the data reproducing unit 110c receives the related data receiving unit 17 which receives the related data Dre indicating the attribute of the multimedia data transmitted from the server SA, and the output RDre of the related data receiving unit 17. And an associated data memory 18 for temporary storage.

Here, the reproduction control section 15c responds to the operation signal Sop from the input section 24 with the related data Dre.
And messages Smd and Rmd for obtaining the multimedia data Md are exchanged with the server SA, and the receiving unit according to the data structure of the multimedia encoded data based on the related data Dre. 11, the operation of the decoding unit 13 and the video / audio output unit 14 is restricted.

The operation restriction in the data reproducing apparatus 100c of the third embodiment is similar to that of the first embodiment so that the receiving unit 11, the decoding unit 13, and the video / audio output unit are controlled so that the battery power consumption is suppressed. At least one of the fourteen operations is restricted, and more specifically, the processing specified by the user among the first to fourth operation restriction processing shown in the first embodiment is performed by the multimedia code. This is performed according to the data structure of the digitized data.

FIG. 7 shows the server SA according to the third embodiment.
FIG. 7 is a diagram showing a flow of data to the data reproducing device 100c. The server SA includes a multimedia encoded data storage unit D storing encoded data of multimedia data.
Bm and a related data storage unit DBr that stores the related data Dre. When a request message for the related data is transmitted from the data reproducing device 100c as the reproducing terminal, the related data Dre is read from the related data storage DBr of the server SA and transmitted to the data reproducing device 100c via the network N. It When a request message for multimedia encoded data is transmitted from the data reproduction device 100c, the multimedia encoded data Md is read from the multimedia encoded data storage unit DBm of the server SA, and the multimedia encoded data Md is read via the network N. It is transmitted to the data reproducing device 100c. Here, HTTP / TCP / IP is used as the transmission protocol, but the transmission protocol may be any other protocol as long as the data reproducing apparatus 100c can acquire data from the server SA.

FIG. 9 shows the description Dr of the related data Dre.
It is a figure for demonstrating an example of ec. The related data Dre is expressed by a combination of a unique character string representing an attribute and an attribute value for the attribute. For example, in FIG.
The character string Iaf on the first line in the description Drec of the related data Dre shown in FIG. 11 is information indicating the attribute of the file (file attribute information), and indicates that this description Drec is a description regarding the contents of the multimedia data. .
The character string on the second line in the above description Drec is information (data attribute information) Iad indicating the attribute of the data, and the related data Dre is “www.news.net/” on the network.
It is related to the multimedia coded data "sport.mp4" accumulated at the location. Further, it is possible to cope with a time series change of the related data Dre corresponding to the multimedia encoded data by using the time attribute.

For example, the character string Iat1 on the third line in the description Drec shown in FIG. 9 is information indicating the time attribute (time attribute information). This time attribute information Iat1 uses the character string [time], and the reproduction time of the multimedia data is 0 in the portion surrounded by the symbol string [<time] and the symbol string [>].
It indicates that the information corresponding to the portion from the second to the 30 seconds is described. The character string Iac1 on the fourth line in the above description Drec is information indicating the content attribute (content attribute information), and indicates that the value related to the content indicated by the character string [priority] is a high level [high]. . In the description Drec shown in FIG. 9, the time attribute information Iat1 and the content attribute information Iac1 indicate that the importance of the portion of the multimedia data from the reproduction time 0 seconds to 30 seconds is high. .

Similarly, it can be seen from the time attribute information Iat2 and the content attribute information Iac2 in the description Drec shown in FIG. 9 that the importance of the portion of the multimedia data from 30 seconds to 60 seconds is low.

When it is necessary to update the related data stored in the related data memory 18 as the contents of the multimedia data change, the related data receiving unit 1
7, new related data is acquired from the server SA, and the related data stored in the related data memory 18 is rewritten with the newly acquired related data.

Next, the operation will be described. First, the operation of the data reproducing device 100c for acquiring multimedia data and related data will be described. For example, when the multimedia data “sport.mp4” in the MP4 file format including the video data and the audio data and the related data “sport.meta” corresponding to the MP4 file format are acquired by using HTTP, first, the data The reproduction device 100c transmits a command (request message) for acquiring the related data “sport.meta” to the server SA, and the data reproduction device 10
0c receives the related data “sport.meta” transmitted from the server in response to the request message. Note that the data acquired by the data reproducing device is encoded data of the multimedia data “sport.meta”, but for convenience of description, it is also simply referred to as multimedia data “sport.meta”.

Next, the data reproducing device 100c transmits a command (request message) for acquiring the multimedia data "sport.mp4" to the server SA, and the data reproducing device 100c responds to the request message. Multimedia data “sport.mp” sent from server SA
Receive 4 ”.

From the server SA to the data reproducing device 10
The transmission of the related data and the multimedia data to 0c is not limited to the case where they are separately performed as described above, but the related data and the multimedia data may be collectively transmitted as data corresponding to one file. .

FIG. 8 shows message exchange and data transmission / reception performed between the data reproducing device 100c and the server SA according to the passage of time. Hereinafter, details of the operation of acquiring related data and multimedia data will be described. explain.

[0130] By the user, a predetermined content (multimedia data) and related data Dre corresponding to the predetermined content
When the operation of the input unit 24 for obtaining is performed and the operation signal Sop corresponding to the operation is output from the input unit 24 to the reproduction control unit 15c, the reproduction control unit 15c receives the control signal Ct26. , And instructs the session management unit 26 to sequentially acquire the related data and the multimedia data.

Then, the session management unit 26 causes the related data request message (GET http://www.news.net/sp
ort.meta) Smr is transmitted to the server SA (time T = t
c1). When the request message Smr is received by the server SA, the server SA transmits a response message (HTTP / 1.1 200 OK) Rmr to the request message Smr to the reproduction terminal (data reproduction device) 100c (time T = tc2), and thereafter, the related data Dre is transmitted to the reproduction terminal (data reproduction device) 100c (time T).
= Tc3). The transmitted related data Dre is received by the related data receiving unit 17 of the reproduction terminal 100c.

Then, the session management section 26 sends the content request message (GET http://www.news.net/sp
ort.mp4) Smd is transmitted to the server SA (time T = t
c4). When the request message Smd is received by the server SA, the server SA transmits a response message (HTTP / 1.1 200 OK) Rmd to the request message Smd to the reproducing terminal (data reproducing device) 100c (time T = tc5), and thereafter, the encoded data (multimedia encoded data) Md of the multimedia data is transmitted to the reproduction terminal (data reproduction device) 100c (time T = tc6).

Next, the operation of the data reproducing apparatus 100c for reproducing the multimedia encoded data based on the related data will be described. Hereinafter, this data reproducing device 100
The operation when the restriction mode is set for c will be described.

The related data receiving unit 17 receives the related data Dre transmitted from the server SA, and the received related data Rre is stored in the related data memory 18.
The reproduction control unit 15c, based on the related data Rre stored in the related data memory 18, receives the receiving unit 11 and the decoding unit 1.
3. At least one operation of the video / audio output unit 14 is restricted.

As specific processing for the operation restriction at this time, among the four operation restriction processing described in the first embodiment, the processing specified by the user setting or the default setting of the data reproducing apparatus is performed. The receiving unit 1
Since the operation restriction of 1 may or may not be possible depending on the data structure of the input multimedia encoded data, in the third embodiment, a process of reproducing only one of audio and video ( When the reproduction process is restricted by restricting the operation of the reception unit 11 as in the case of performing the third operation restriction process), the reception unit is previously based on the data structure of the multimedia encoded data. It is determined whether or not the operation restriction of is possible.

The following will describe the operation restriction when the first operation restriction processing (processing for restricting the brightness level at the time of image display) is set. In this case, as described in the first embodiment, only the operation of the video / audio output unit 14 can be restricted. Therefore, the operation of the video / audio output unit 14 is restricted based on the related data Dre.

For example, in the case where the related data Dre is as shown in FIG. 9, the reproduction control section 15c determines that the reproduction time of the multimedia data from 0 second to 30 seconds is of high importance. The video / audio output unit 14 is controlled so that image display is performed at a normal brightness level until 30 seconds have elapsed from the start of. Also, since the portion of the multimedia data between the reproduction time of 30 seconds and 60 seconds is low in importance, the reproduction control unit 15c controls the reproduction control section 15c from the time when 30 seconds elapse to the time when 60 seconds elapse. In the meantime, the video / audio output unit 14 controls the image display to be performed at a level lower than the normal brightness level.

In the data reproducing apparatus 100c according to the third embodiment, when the operation mode is set to the non-restricted mode by the user, the operation restriction based on the related data is not performed. The same operation as the operation of the first data reproducing apparatus 100a in the non-restricted mode is performed.

As described above, in the data reproducing apparatus 100c of the third embodiment, the receiving unit 11 that receives the encoded data Md of the multimedia data and the received encoded data R are received.
In addition to a decoding unit 13 for decoding Md and a video / audio output unit 14 for image display or audio output based on the decoded multimedia data Dd, related data for receiving related data Dre related to multimedia data. The receiving unit 17 is provided, and as the related data Dre, the one indicating the degree of importance set for each part of the multimedia data divided according to the reproduction time is acquired, and the multimedia is calculated based on the related data Dre. Reproduction processing is performed on important parts of the encoded data so that the reproduction quality is kept high, and for less important parts of the multimedia encoded data, the operation limit of the video / audio output unit 14 is applied. Since the playback quality is reduced to some extent and the playback processing is performed, the playback of multimedia data can be performed while suppressing power consumption. For the main part it can be carried out so that the reproduction quality is high.

That is, in addition to the effect that it is possible to effectively reduce power consumption and use a moving image distribution service for a long time in a battery-powered portable terminal, the reproduction terminal reproduces multimedia data. Operations can be restricted depending on their content.

Therefore, the reproduction of multimedia data is
This can be performed without lowering the reproduction quality of the video data or audio data included in the multimedia data, which is important for the user, and suppressing power consumption.

In the third embodiment, the case where the first operation limiting process (the process of limiting the brightness at the time of displaying an image) is performed is shown as the specific process of the operation limiting. The target process is not limited to this, and may be a combination of some of the first to fourth operation restriction processes described in the first embodiment.

For example, when reproducing a highly important portion of multimedia data, image display is performed without restricting the operation of the video / audio output unit 14 of the data reproducing unit 110c, and the importance of the multimedia data is medium. When reproducing a part, the image display by the video / audio output unit 14 is performed at a brightness level lower than the normal level, and when reproducing a part where the importance of multimedia data is low, the image by the video / audio output unit 14 is reproduced. The display may be performed without outputting the sound.

In the third embodiment, the case where the related data Dre indicates the importance set for each part of the multimedia data divided according to the reproduction time has been described. The related data may include content attribute information indicating related items other than the importance regarding the multimedia data.

For example, when the related data includes the content attribute information indicating the "category" of the multimedia data, the reproduction control section 15c, based on the related data,
When it is determined that the multimedia data has a low degree of importance and the category is news, the receiving unit 11 performs the reproduction of the multimedia data.
Due to the operation restriction, only audio output of video output (image display) and audio output is performed, and based on the related data, the multimedia data has a low importance and the category is sports. When it is determined that the image output (image display) and the audio output, only the image display may be performed due to the operation restriction of the receiving unit 11.

In the third embodiment, when the reproduction processing of multimedia encoded data is restricted by the operation restriction of the receiving unit 11 as the data reproducing apparatus, it is based on the data structure of the multimedia encoded data in advance. hand,
Although it has been shown what determines whether or not the operation of the receiver can be restricted, the related data indicates whether or not the multimedia encoded data can be subjected to the operation of the receiver. If so, the data reproducing device may limit the operation of the receiving unit or the operation of the other decoding unit and the video / audio output unit based on only the related data.

In the third embodiment, the case where the data reproducing apparatus acquires the multimedia encoded data and the related data corresponding thereto from the same server SA has been described. If the related data corresponding to is stored in a different server, the data reproducing device will acquire the respective data from a different server.

(Fourth Embodiment) FIG. 10 is a block diagram illustrating a data reproducing apparatus according to a fourth embodiment of the present invention. The data reproducing apparatus 100d according to the fourth embodiment is
Instead of the data reproducing unit 110a of the data reproducing apparatus 100a of the first embodiment, the operation of reproducing multimedia data is performed by using the related data D related to the multimedia data.
re and the data reproducing device 100d are recorded in advance,
The data reproducing unit 110d for limiting is provided based on the degree of importance determined from the preference data D indicating the user's preference.

The data reproducing unit 110d is similar to the data reproducing unit 110c in the third embodiment, and the receiving unit 11, the memory 12, the decoding unit 13, the video / audio output unit 14, the session management unit 26, and the related data receiving unit 17 are included. , The related data memory 18d, the reproduction control unit 15d, and the input unit 24d, and the receiving unit 11, the memory 12, the decoding unit 13, the video / audio output unit 14, the related data receiving unit 17, and the session management unit 26. , Which is the same as that of the third embodiment.

Further, the data reproducing section 110d includes the preference data memory 20 for recording the preference data Dfv indicating the user's preference and the content acquired by the user contained in the relevant data stored in the relevant data memory 18d. The information Rre2 regarding the type of data and the number of times the same content has been acquired is generated to generate the preference data Dfv indicating the user's preference, and the information Di regarding the user's preference input by the user operation from the input unit 24d.
The registration unit 23 generates the preference data Dfv indicating the user's preference from p and outputs the generated preference data Dfv to the preference data memory 20.

Further, the data reproducing unit 110d is provided with the attribute information Dre1 of the multimedia data included in the related data Dre related to the multimedia data and the preference data D stored in the preference data memory 20.
Determine the importance of multimedia data from fv,
It has a determination unit 21 that outputs information (importance information) Is indicating the importance to the reproduction control unit 15d.

The reproduction control unit 15d exchanges the messages Smd and Rmd for obtaining the related data Dre and the multimedia encoded data Md with the server SA in response to the operation signal Sop from the input unit 24d. In addition, the operation of the receiving unit 11, the decoding unit 13, and the video / audio output unit 14 is restricted based on the importance information Is.

In the data reproducing apparatus 100d according to the fourth embodiment, the operation restriction for suppressing the battery power consumption is the same as in the first embodiment.
3, and the operation of at least one of the video / audio output unit 14 is limited. Specifically, the first embodiment is described.
The processing designated by the user among the first to fourth operation restriction processings shown by is performed based on the importance information Is.

FIG. 11 is a diagram for explaining an example of a description of related data. Related data D shown in FIG.
The character string Iaf on the first line in the description Dred of re is
This is the same as the file attribute information shown in FIG. 9, and indicates that this description Dred is a description regarding the contents of the multimedia data. Further, the character string Iad on the second line in the above description Dred is the same as the data attribute information shown in FIG. 9, and the related data Dre is stored in the location "www.news.net/" on the network. "Spo
rt.mp4 ”related to multimedia data. Furthermore, the description Dre shown in FIG.
Character strings Iat1 and Ia on the third and seventh lines in d
t2 is the same as the time attribute information shown in FIG.

There are many possible methods for classifying the content of multimedia data in related data. Here, the character string [category] Iac1 on the fourth line in the description Dred shown in FIG. Attribute information), and the value of the content attribute is sports [sports]
Accordingly, the content attribute information Iac1 indicates that the multimedia data is sports-related information.

The character string [data] Iac2 on the fifth line in the description Dred shown in FIG. 11 is information (content attribute information) indicating the content attribute, and the value of the content attribute is [latest]. By this, the content attribute information Ia
c2 indicates that this multimedia data is the latest information.

Therefore, from the time attribute information Iat1 and the content attribute information Iac1 and Iac2, it can be seen that the portion of the multimedia data from the reproduction time 0 second to 30 seconds is the information about the recent sports.

Similarly, the description Dr shown in FIG.
Time attribute information Iat2 and content attribute information Ia in ed
From c3 and Iac4, it can be seen that the portion of the multimedia data from 30 seconds to 60 seconds is information regarding the recent weather. In the related data, it is possible to classify and represent the multimedia data based on the priority, the target age, the popularity, the region, the characters, and the like.

FIG. 12 is a diagram showing an example of the preference data stored in the preference data memory 20. Similar to the data related to multimedia data (related data), data related to user's taste (preference data) is also described by a combination of a unique character string representing an attribute and an attribute value for the attribute.

Description Df of preference data Dfv shown in FIG.
The character string <UserPreference> Iafu in the first line of vd is
The description Dfvd is information indicating file attributes (file attribute information), and indicates that the description Dfvd is a description relating to user preference. In this preference data, the user's preference is classified according to the attribute (type) of the preference, and the preference information value FV (y) indicating the priority order of the user's preference is set for each attribute value AV (x) of each attribute. ing. Here, the specific attribute value AV (x) is AV (1) to AV (7), and the specific preference information value FV (y) is FV (1) to FV (7).
Is.

For example, the attribute values AV (1), AV (2), AV of the preference attribute <category> indicated by the preference attribute information Iafv1.
(3) and AV (4) include "sports" and "financ", respectively.
“E”, “politics”, and “weather” are assigned, and the attribute values AV (5), AV (6), and AV (7) of the preference attribute <date> indicated by the preference attribute information Iafv2 are “lat”, respectively.
"est", "new", and "old" are assigned.

Then, the priority of the user's preference for each of the attribute values AV (1) to AV (7) is set by an index called the preference information value FV (y). In the preference data description Dfvd shown in FIG. 12, attribute values AV (1), AV (2), AV
In (3), AV (4), AV (5), AV (6), and AV (7), preference information value FV (1) (=
3), FV (2) (= 3), FV (3) (= 2), FV (4)
(= 1), FV (5) (= 3), FV (6) (= 2), FV
(7) (= 1) is set. Here, the preference information value F
V (y) indicates that the larger the numerical value, the higher the priority.

As a method for registering the user's preference corresponding to the description Dfvd shown in FIG. 12, (i) the user directly inputs the user's preference information in advance, and the preference data indicating the user's preference is selected. Method of storing in data memory 20 (first registration method), (ii) Data reproducing device 10
0d estimates the user's preference based on the related data and stores the preference data corresponding to the estimated preference in the preference data memory 20 (second registration method), (iii) the preference data indicating the user's preference Is acquired from a predetermined server on the network, and the acquired preference data is stored in the preference data memory 20 (third registration method).

However, in the data reproducing apparatus 100d of the fourth embodiment, the first registration method and the second registration method are used as the method of registering the user's preference. This will be specifically described.

(I) Concrete explanation of the first registration method When the user performs an input operation of information relating to the user's preference using the keyboard or the like at the input unit 24d, the user's preference is input from the input unit 24d. Information Dip regarding the information is output to the registration unit 23. Then, the registration unit 23 uses the input unit 2
Preference data Dfv indicating the information Dip output from 4d
To the preference data memory 20, and the preference data memory 2
0 stores the preference data Dfv from the registration unit 23.

The preference data memory section 20 is not limited to the one constituted by the memory chip incorporated in the data reproducing apparatus 100d, but may be the data reproducing apparatus 100.
It may be a data recording unit that writes or reads the preference data Dip to or from a recording medium detachably attached to d. In this case, the user may write the preference data into the recording medium using a personal computer or the like. For example, when the recording medium is attached to a personal computer and information about a user's preference is input by operating a data input unit of the personal computer, the preference data is written to the recording medium by the process of the personal computer. Then, when the recording medium on which the preference data is recorded is attached to the data reproducing device,
In the data reproducing device, the preference data recorded in the recording medium is used in a predetermined processing unit of the data reproducing device.

(Ii) Specific Description of Second Registration Method The registration unit 23 uses the related data Rre stored in the related data memory 18 to obtain information about the type and number of times the content (multimedia data) viewed by the user. R
Re2 is acquired and output to the preference data memory 20. Then, the preference data Dfv indicating the user's preference is updated in the preference data memory 20 according to the type and the number of times. That is, the preference data Dfv stored in the preference data memory 20 is automatically updated by the registration unit 23 as the related data stored in the related data memory 18d is updated.

Next, the operation will be described. Here, in the data reproducing apparatus 100d of the fourth embodiment, the information Dip indicating the user's preference is already registered by the user, and this information Dip is stored in the preference data memory 20 as the preference data Dfv. The operation of will be described.

The registration of the information regarding the user's taste is performed by the user performing the input operation of the information regarding the user's taste using the keyboard or the like in the input unit 24d, as described above.

Data reproducing apparatus 100 according to the fourth embodiment
In d, the operations of the receiving unit 11, the memory 12, the decoding unit 13, the video / audio output unit 14, the related data receiving unit 17, and the session management unit 26 are the same as those of the data reproducing apparatus 1 according to the third embodiment.
The same as that of 00c.

That is, in the data reproducing apparatus 100d,
When the session management unit 26 transmits the request message Smr for the related data to the server SA, the related data Dre is transmitted from the server SA. Further, when the session management unit 26 transmits the multimedia data request message Smd to the server SA, the server SA transmits the multimedia encoded data Md.

In the data reproducing apparatus 100d, the reproducing process for the multimedia encoded data Md from the server SA is performed based on the related data Dre and the preference data Dfv stored in the preference data memory 20.

The operation when the restriction mode is set for this data reproducing apparatus 100d will be described below. The related data receiving unit 17 receives the related data Dre transmitted from the server SA, and the received related data Rre is stored in the related data memory 18.

The reproduction control unit 15d is connected to the related data memory 1
8 based on the multimedia attribute information Rre1 of the related data Rre stored in 8 and the importance Is of the multimedia data obtained from the preference data Dfv stored in the preference data memory 20.
At least one operation of the video / audio output unit 14 is restricted.

Here, as a concrete operation restriction process,
Depending on the importance of the multimedia data, either the second operation restriction processing (processing for restricting the frame to be reproduced) or the third operation restriction processing (processing for reproducing only audio or video) is performed. Is set by the user. Specifically, as shown in FIG. 15, during reproduction of the highly important portion Vac1 of the multimedia data,
Normal decoding process Ocon for decoding all frame data
When t1 is performed and the part Vac2 of medium importance is reproduced, the second operation restriction process Ocont2 for decoding only the data of the I frame is executed, and the part Vac of low importance is performed.
At the time of reproduction of No. 3, a third operation restriction process Ocont3 for decoding only audio data is performed.

The operation restriction process by the reproduction control unit 15d will be specifically described below. FIG. 13 shows a flow of processing in the determination unit 21 and the reproduction control unit 15d. First, the determination unit 2
1 acquires the content attribute information Iac1 to Iac4 which is the attribute information Rre1 included in the related data Rre stored in the related data memory 18, and the preference attribute indicating the attribute that matches the attribute indicated by the acquired content attribute information. Information
Preference data Df stored in the preference data memory 20
Whether or not it is included in v is determined for each attribute indicated by the acquired content attribute information.

When the preference data Dfv includes the preference attribute information whose attributes match the content attribute information of the related data Rre, the determination section 21 determines the preference information value FV (for the attribute to be determined). y) is acquired, and in other cases, the value FV (fix) prepared in advance is used as the preference information value FV (y). Further, the related data Dre includes a plurality of content attribute information Iac, and it is determined whether or not the content attribute information included in the related data and the preference attribute information included in the preference data match the attributes. When the above is performed, the sum total of the preference information values FV (y) for all the attributes that are the objects of determination is calculated (step S101).

Next, the judging section 21 determines the preference information value FV (y).
Of the multimedia data is compared with a threshold value set in advance according to the number of attributes to be determined to determine the importance of the multimedia data and information (importance information) Is indicating the importance.
Is output (step S102).

FIG. 14 shows an example of thresholds used in the determination of the degree of importance in the determination section 21. In the example shown in FIG. 14, when the number Nac of the content attribute information Iac included in the related data Dre is 2, the sum ΣFV (y) of the preference information values FV (y).
Is 5 or more (5 ≦ ΣFV (y)) and 3 or more and less than 5 (3 ≦ ΣF
When V (y) <5) and less than 3 (ΣFV (y) <3), the importance is [high] level HIs, [medium] level MIs, respectively.
[Low] level LIs.

For example, in the description Dred of the related data Dre shown in FIG. 11, from the time attribute information Iat1, the content attribute information Iac1 and the content attribute information Iat2, the portion of the multimedia data from the reproduction time 0 seconds to 30 seconds However, it is shown that the information is about recent sports.
In the description Dfvd of the preference data Dfv, the attribute value AV (1) [sports] and the preference attribute information Iafv2 of the preference attribute <category> indicated by the preference attribute information Iafv1 corresponding to the content attribute information Iac1 and the content attribute information Iac2. The attribute value AV (5) [latest] indicated by indicates the preference information value FV (1)
(= 3) and the preference information value FV (5) (= 3) are assigned. Therefore, the sum ΣFV (y) (= FV (1) + FV (5)) of the preference information values calculated in step S101 is
6 (= 3 + 3).

In this case, the number of attributes to be determined is two, that is, the attribute indicated by the content attribute information Iac1 and the attribute indicated by the content attribute information Iat2.
Determines that the importance of the portion of the multimedia data from the reproduction time 0 seconds to 30 seconds is [high] level Hls.

Then, the reproduction control section 15d has the determination section 21.
Based on the importance information Is output from
Are controlled so that the data of all frames are decoded (step S105).

If the determination unit 21 determines that the importance of the portion of the multimedia data from the reproduction time 0 seconds to 30 seconds is the [medium] level, the reproduction control unit 15d.
Controls the decoding unit 13 based on the importance information Is output from the determination unit 21 so that the data of only the I frame is decoded (step S104).
However, if the importance of the portion of the multimedia data from the reproduction time of 0 seconds to 30 seconds is determined to be the [low] level, the reproduction control unit 15d outputs the importance degree information output from the determination unit 21. Based on Is, the decoding unit 13 is controlled so that only audio data is decoded (step S103).

The operation restrictions in steps S104 and S103 are not limited to decoding only specific data, and as described in the first embodiment, (1) change of brightness and (2) restriction of frame. , (3) restrictions on audio or video, and (4) restrictions when hierarchically encoded, and these may be used in combination.

Further, FIG. 15 shows an example of switching of operation limitation by the reproduction control unit 15d in the fourth embodiment. In this example, the attribute value of the content attribute information Iac of the multimedia data is changed every 30 seconds to the attribute value [spor
ts] Vat (1), attribute value [weather] Vat (2), attribute value [mus
ic] Vat (3). In addition, the judgment result of the importance for each of the content attribute values is [High].
Level HIs, [Medium] level MIs, [Low] level LI
s, the operation limiting process for each determined importance is the decoding process O for all frames, as shown in FIG.
cont1, decoding processing Ocont2 for I frame only,
The decoding process Ocont3 for only audio data is set. In this case, the reproduction control unit 15d performs an operation restriction process on the decoding unit 13 every 30 seconds from the start of the reproduction by performing the all-frame decoding process Ocont1, the I-frame only decoding process Ocont2, and the audio-only decoding process. The processing is switched in the order of Ocont3.

As described above, in the data reproducing apparatus 100d of the fourth embodiment, the related data receiving section 17 for receiving the related data Dre which is the data related to the multimedia data, and the taste data Dfv concerning the user's taste are stored. A preference data memory 20, a determination unit 21 for determining the importance of the received multimedia encoded data based on the related data and the preference data, and the multimedia encoded data according to the importance. Since the reproduction control unit 15d for limiting the reproduction operation is provided, in addition to the effect that the power consumption from the battery 16 is suppressed, the data reproduction can be performed for a long time as in the first embodiment.
The reproduction operation of multimedia data can be restricted according to the content of the multimedia data and the preference of the user.

When the importance changes with the passage of time from the start of reproduction of multimedia data, the reproduction limit for one piece of multimedia data changes finely with the passage of time. Therefore, it is not necessary for the user to set operation restrictions on the portions of the multimedia data corresponding to different contents such as sports, weather forecasts, and news.

In the fourth embodiment, the sum of the information values of the content attribute information included in the related data and the preference attribute information having the same attribute is used as the index for determining the importance of the multimedia data. The index may be the average value of the information values of the preference attribute information whose attributes match the content attribute information of the related data, or for each content attribute information, with respect to the information value of the corresponding preference attribute information. Weighting may be performed and the weighted value of the preference attribute information may be used.

Further, in the fourth embodiment, the threshold value used in the determination of the importance is a fixed value determined in advance according to the number of attributes to be determined, as shown in FIG. The threshold value used for determining the importance of each multimedia data may be a value calculated according to a predetermined rule.

Further, in the fourth embodiment, three levels, that is, high level Hls, are set as the levels of importance.
Although the case where the middle level MIs and the low level LIs are set is shown, the level of importance is not limited to these three levels, but may be set to 5 or more levels, for example.

In the fourth embodiment, the threshold value used for the determination of the importance is determined as the threshold of the determination target attribute when the number of attributes for the importance determination is one (the number of determination target attributes). If the number is 2, the number of attributes to be judged is 3
Although the values are set separately for the three cases, the threshold value for determining the importance may be the value set for the cases other than the above three cases.

(Fifth Embodiment) FIG. 16 is a block diagram illustrating a data reproducing apparatus according to a fifth embodiment of the present invention. The data reproducing apparatus 100e according to the fifth embodiment is
Instead of the data reproducing unit 110d of the data reproducing apparatus 100d of the fourth embodiment, the operation of reproducing multimedia data is performed by using the related data D related to the multimedia data.
based on the degree of importance determined from re and the preference data Dfv indicating the user's preference stored in the data reproduction device 100d, and the preference data Dfa is set.
Is provided from the server SB on the network.

The data reproducing unit 110e, like the data reproducing unit 110d of the fourth embodiment, has a receiving unit 11, a memory 12, a decoding unit 13, a video / audio output unit 14, a reproduction control unit 15e, and a related data receiving unit 17. , Related data memory 1
8d, preference data memory 20, registration unit 23e, input unit 2
4d and a session management unit 26, the receiving unit 11, the memory 12, the decoding unit 13, the video and audio output unit 1
4, related data receiving unit 17, related data memory 18d,
The preference data memory 20, the determination unit 21, the input unit 24d, and the session management unit 26 are the same as those in the fourth embodiment.

Further, the data reproducing section 110e has a preference data acquiring section 25 for acquiring the preference data Dfa from the server SB on the network. Here, the registration unit 23e of the data reproduction unit 110e acquires information Rre2 regarding the type of content acquired by the user and the number of times the same content is acquired, of the related data stored in the related data memory 18d. , The preference data Dfv indicating the user's preference is generated, and the preference data Dfv indicating the user's preference is generated from the information Dip regarding the user's preference input by the user operation from the input unit 24d, and the generated preference data The Dfv is output to the taste data memory 20, and the taste data Gfa acquired by the taste data acquisition unit 25 is output to the taste data memory 20.

The reproduction control section 15e responds to the operation signal Sop from the input section 24d, and the session management section 26.
, Messages Smr, Smd and Rmr for obtaining the related data Dre and the multimedia data Md,
It controls to exchange the Rmd with the server SA. The reproduction control unit 15e causes the session management unit 26 to exchange messages for acquiring the preference data Dfa in response to the operation signal Sop from the input unit 24d.
The control is performed so as to be performed with another server SB.
Further, the reproduction control unit 15e, based on the importance degree information Is, the receiving unit 11, the decoding unit 13, the video / audio output unit 1
The operation restriction of No. 4 is performed. The other configuration of the data reproducing device 100e according to the fifth embodiment is as follows.
It is the same as that of the fourth embodiment.

Next, the operation will be described. The operation of the data reproducing apparatus 100e of the fifth embodiment is performed by adding the preference data to the server SB on the network in addition to the first and second registration processes shown in the fourth embodiment, as the process of registering the preference data. Acquired from the above preference data memory 20
The operation is different from that of the above-described fourth embodiment only in that the third registration processing for storing the data in the third embodiment is performed. That is, the other operations of the data reproducing apparatus 100e of the fifth embodiment are exactly the same as those of the data reproducing apparatus 100d of the fourth embodiment, and hereinafter, the data reproducing apparatus 10 of the fifth embodiment will be described.
The operation of the 0e performing the third registration processing will be briefly described.

That is, the reproduction control unit 15e of the data reproducing apparatus 100e of the fifth embodiment causes the session management unit 26 to send a message for acquiring the preference data Dfa in response to the operation signal Sop from the input unit 24d. Exchange
Control is performed so as to be performed with another server SB. Then, the preference data Dfa is transmitted from the server SB by message exchange between the session management unit 26 and the server SB. Preference data Dfa transmitted from server SB
Is acquired by the preference data acquisition unit 25, and the acquired preference data Gfa is supplied to the registration unit 23e.

The registration unit 23e receives the preference information Dip supplied from the input unit 24d and the preference information Rr obtained from the related data Dre stored in the related data memory 18.
The e2 is supplied to the preference data memory 20 as the preference data Dfv, and the preference data Gfa supplied from the preference data acquisition unit 25 is supplied to the preference data memory 20 as the preference data Dfv.

As described above, in the fifth embodiment, instead of the data reproducing section 110d of the fourth embodiment, in addition to the data reproducing processing in the data reproducing section 110d, the data is stored in a predetermined server SB. The preference data Dfa regarding the user's preference is acquired, the preference information Dip supplied from the input unit 24d, and the preference information Rr obtained from the related data Dre.
e2, preference data Gfa acquired from the server SB
Based on the above, since the data reproduction unit 110e for restricting the operation of reproducing the multimedia encoded data is provided,
Similar to the fourth embodiment, in addition to the effect that it is possible to reproduce the data for a long time by suppressing the power consumption from the battery 16, the restriction of the reproduction operation of the multimedia data is performed.
This can be performed in accordance with the user preference data acquired from the server on the network, which makes it possible to limit the reproduction operation of the multimedia data to be more suitable for the user's preference.

[0200] In each of the above-mentioned embodiments, as the data reproducing device, the reproduction control units 15a to 15e restrict the reproduction process for multimedia data, and the receiving unit 11, the decoding unit 13, and the audio / video of the data reproducing unit. Although what is performed by limiting at least one operation of the output unit 14 is shown, in the above data reproducing apparatus, the multimedia encoded data supplied from the server is the audio encoded data included in the encoded data, The data request may be made so as to be limited to one of the video coded data.

For example, the data reproducing apparatus 1 according to the third embodiment
At 00c, based on the attributes of multimedia data,
When the data request is made so that the multimedia coded data supplied from the server is limited to one of the audio coded data and the video coded data included in the coded data as described above, FIG. As shown, after the related data Rre is acquired and before the messages Smd and Rmd for acquiring the multimedia encoded data are exchanged, the video encoding included in the multimedia encoded data is transmitted to the server SA. Restriction command S so that only one of the data and the voice coded data is transmitted
Need to send mc.

Further, in each of the above-described embodiments, the case where the reproduction process for multimedia data is restricted only when the operation mode of the data reproduction device is set by the user has been described. , Playback processing for multimedia data (hereinafter,
Also called data reproduction processing. ) Is restricted regardless of the setting of the operation mode by the user.
It may be determined according to the remaining battery power of the.

That is, in such a data reproducing device,
Even if the user sets the operation mode of the data reproducing device to the power saving mode (limit mode), if the remaining amount of the battery power of the power supply unit 16 is equal to or more than a certain standard, the operation is not limited, Even if the user sets the operation mode of the data reproducing device to the normal power mode (non-limit mode), if the remaining battery power of the power supply unit 16 is less than a certain reference value, the operation is restricted. Done.

In the data reproducing apparatus according to the third or fourth embodiment, the battery of the power supply unit 16 can be used even when the determination unit 21 determines that the importance of multimedia data is at the [low] level. When the remaining amount of electric power is equal to or greater than the reference value, the operation may be limited when the importance is determined to be the [medium] level.

Further, in the above embodiment, the judgment unit 21
The threshold value used in the determination of is a preset fixed value, but this threshold value is higher in importance depending on the remaining battery power of the power supply unit, for example, [high] level or [medium]. ] The rate determined as the level may be increased, or conversely, the degree of importance may be changed to increase the rate determined as the [medium] level or the [low] level.

Furthermore, in the above-described first to fifth embodiments, the data reproducing device is realized by hardware, but these devices may be realized by software. In this case, by recording the program for performing the data reproduction processing shown in each of the above embodiments in a data storage medium such as a flexible disk, the data reproduction processing can be constructed in an independent computer system. It will be possible.

In this case, the processing by the circuit elements other than the memory, which constitute the data reproducing apparatus of the first to fifth embodiments, may be executed by software.

FIG. 18 is a view for explaining a recording medium storing a program for performing data reproduction processing by software in the data reproducing apparatus of the first to fifth embodiments and a computer system including the recording medium. It is a figure.

[0209] Fig. 18 (a) shows the external appearance of the flexible disk as viewed from the front, the sectional structure, and the flexible disk body, and Fig. 18 (b) shows an example of the physical format of the flexible disk body.

The flexible disk FD has a structure in which the flexible disk body D is housed in a flexible disk case FC, and a plurality of flexible disk bodies D are concentrically formed from the outer circumference to the inner circumference. Tracks Tr are formed, and each track T
r is divided into 16 sectors Se in the circumferential direction. Therefore, in the flexible disk FD storing the program, the data as the program is recorded in the area (sector) Se allocated on the flexible disk body D.

Further, FIG. 18C shows a structure for recording the above program on the flexible disk FD and a structure for performing data processing by software using the program stored in the flexible disk FD. .

The above program is executed on the flexible disk F.
In the case of recording on D, the data as the program is written from the computer system Cs to the flexible disk FD via the flexible disk drive FDD. Further, when the data reproducing apparatus of the above-mentioned first to fifth embodiments is constructed in the computer system Cs by the program recorded on the flexible disk FD,
The program is read from the flexible disk FD by the flexible disk drive FDD and loaded into the computer system Cs.

In the above description, the flexible disk is shown as the data recording medium, but an optical disk may be used as the data recording medium, and in this case, the data reproducing process by software is performed as in the case of the flexible disk. You can Further, the data recording medium is not limited to the optical disc and the flexible disc, and may be any one such as an IC card and a ROM cassette as long as the program can be recorded. Even when these data recording media are used, Similar to the case of using the flexible disk or the like, the data reproducing process by software can be performed.

[0214]

As described above, according to the data reproducing apparatus of the present invention (Claim 1), the data which is operated by the power supplied from the battery and receives and reproduces the encoded data of the multimedia data is reproduced. A reproducing apparatus, which is a receiving unit that receives the encoded data, a decoding unit that decodes the received encoded data and outputs the decoded data, and a video that outputs video and audio based on the decoded data. Since the audio output unit and the control unit that restricts the operation of the receiving unit to receive only a part of the encoded data according to the data structure of the encoded data, In a battery-powered playback terminal, the reduction of battery power consumption will be performed by appropriately limiting the operation according to the data structure of the multimedia data, so that the playback of the multimedia data can be performed for a long time. Effect that can take place over can be obtained.

[0215] According to the present invention (claim 2), in the data reproducing apparatus according to claim 1, the control section limits the operation of the receiving section to video coded data included in the coded data. Since it is characterized in that only one of the audio encoded data is received, it is possible to improve the image display or audio output depending on the content of the multimedia data while suppressing the battery power consumption. It can be carried out.

According to the data reproducing apparatus of the present invention (Claim 3), the data reproducing apparatus operates by the power supplied from the battery and receives and reproduces the encoded data of the multimedia data. A transmitting unit that transmits an instruction requesting encoded data to a terminal on a network, a receiving unit that receives the encoded data transmitted from the terminal according to the instruction, and decodes the received encoded data. The operation of the decoding unit that outputs the decoded data, the video / audio output unit that outputs video and audio based on the decoded data, and the operation of the transmission unit is performed according to the attribute of the multimedia data. Since it is provided with a control unit for controlling so as to transmit a command requesting only a part of data, the receiving unit, the decoding unit and the video / audio output unit are equipped with a multimedia data unit. Depending on the attributes, will be only a portion of the coded data is processed, wasteful consumption of battery power is avoided.

According to the present invention (Claim 4), in the data reproducing apparatus according to Claim 3, the transmitting unit is controlled by the control unit according to the attribute of the multimedia data, and the encoded data is transmitted. Of the video coded data and the audio coded data included in the above, a command requesting only one of the coded data is transmitted. Therefore, only the necessary data of the voice coded data is processed, and wasteful consumption of battery power is avoided.

According to the data reproducing apparatus of the present invention (Claim 5), the data reproducing apparatus operates by the power supplied from the battery and receives and reproduces the encoded data of the multimedia data. A receiving unit for receiving the encoded data, a decoding unit for decoding the received encoded data and outputting the decoded data, a video / audio output unit for outputting video and audio based on the decoded data, and the receiving unit And a decoding unit, and a control unit that restricts one or more operations of the audio / video output unit according to the attribute of the multimedia data so as to suppress the consumption of the battery power. Therefore, in a battery-powered playback terminal, the reduction of battery power consumption is performed by appropriate operation restrictions according to the attributes of multimedia data. The reproduction of the media data, the effect can be performed over a long period of time while maintaining a high reproduction quality of the important data is obtained.

According to the present invention (Claim 6), in the data reproducing apparatus according to Claim 5, a message for exchanging a message with a terminal on the network for acquiring the related data related to the multimedia data. The control unit further includes an exchange unit and a related data acquisition unit that acquires related data transmitted from a terminal on the network, and the control unit limits the operation based on an attribute of the multimedia data indicated by the related data. Since it is characterized in that, in battery-operated mobile terminals, reduction of battery power consumption will be performed by appropriate operation restriction according to related data. It becomes possible to use it for a long time depending on the situation.

According to the present invention (Claim 7), the data reproducing apparatus according to Claim 6 further comprises a data accumulating section for accumulating the received encoded data, and the control section comprises the data accumulating section. Is controlled so that only a part of the encoded data is stored based on the related data. For example, the encoded data is controlled so that battery power consumption is suppressed when the encoded data is received. Even when the reproduction operation is restricted, it is possible to reproduce the encoded data without restricting the operation in a state where there is sufficient battery power such as after charging the battery.

[0221] According to the present invention (claim 8), in the data reproducing apparatus according to claim 7, the control section controls the data storage section by means of video coded data and audio included in the coded data. Since one of the encoded data is stored, only one of the video encoded data and the audio encoded data is stored so that the battery power consumption can be suppressed when receiving the encoded data. Even when only the data is reproduced, it is possible to reproduce the data that was not reproduced at the time of reception in a state where the battery power has a margin such as after charging the battery.

According to the present invention (Claim 9), in the data reproducing apparatus according to Claim 5, the related data indicating the attribute of the multimedia data and the preference indicating the user's preference are communicated with the terminal on the network. A message exchange unit for exchanging messages for acquiring data, a related data acquisition unit for acquiring related data transmitted from the terminal on the network, and preference data for acquiring preference data transmitted from the terminal on the network An acquisition unit and a determination unit that determines the importance of the received encoded data based on the related data and the preference data,
Since the control unit is characterized by limiting the operation based on the importance of the encoded data determined by the determination unit, it is possible to reduce battery power consumption in a battery-powered reproduction terminal. The operation is controlled by an appropriate operation restriction according to the importance of the multimedia data, and it becomes possible to use the moving image distribution service or the like for a long time according to the importance of the multimedia data.

According to the present invention (claim 10), claim 9
In the data reproducing apparatus described above, further comprising a data storage unit that stores the received encoded data, the control unit, the data storage unit, in the importance of the encoded data determined by the determination unit. On the basis of the above, the control is performed so that only a part of the encoded data is stored, so that when the encoded data is received, the encoded data is decoded and output so as to reduce the battery power consumption. Even if it does not exist, the encoded data having a high degree of importance can be reproduced in a state where the battery power has a margin such as after charging the battery.

According to the present invention (claim 11), claim 5
In the data reproducing apparatus described above, the control unit controls the operation according to the remaining amount of the battery power, so that, for example, the reception is performed in a state where the remaining amount of the battery power is small. It is possible to prevent the data reproducing apparatus from becoming unusable due to the reduction of the battery voltage due to the reproduction of the encoded data. Further, when the remaining amount of battery power is sufficient, it is possible to relax the restriction on the operation and provide high quality reproduced video and reproduced sound.

According to the present invention (claim 12), claim 5
In the data reproducing apparatus described above, the video / audio output unit performs image display based on the decoded data, and the control unit limits the operation of the video / audio output unit when the image is displayed. Since the brightness level is limited, it is possible to display an image while suppressing battery power consumption.

According to the present invention (claim 13), claim 5
In the data reproducing apparatus described, the control unit decodes or outputs data for a part of frames of the video encoded data included in the encoded data,
Since the above-mentioned operation is limited, by performing data reproduction processing such as an image with little motion every few frames, it is possible to display favorably at a normal brightness level while suppressing battery power consumption. it can.

According to the present invention (claim 14), claim 5
In the data reproducing apparatus described above, the control unit limits the operation so as to receive, decode, and output only one of the video coded data and the audio coded data included in the coded data. Since this is performed, it is possible to favorably perform either image display or audio output according to the content of the multimedia data while suppressing battery power consumption.

According to the present invention (claim 15), claim 5
In the data reproducing apparatus described, the control unit, based on the attribute of the multimedia, of the encoded data,
Since the above-mentioned operation is limited so that only high-priority data is decoded or output, reproduction of encoded data of multimedia data can be performed while suppressing battery power consumption, Moreover, the reproduction quality of the important part can be kept high.

According to the present invention (claim 16), claim 5
In the described data reproducing device, the encoded data is
The multimedia data is hierarchically encoded data obtained by dividing the multimedia data into a basic layer and an additional layer and encoding the layers hierarchically. The control unit only includes data corresponding to the basic layer of the encoded data. Since the above-mentioned operation is limited so as to receive, decode, or output, the encoded data of multimedia data can be reproduced over the whole while suppressing consumption of battery power.

According to the present invention (claim 17), claim 1
6. The data reproducing device according to 6, further comprising a data storage unit that stores the received encoded data, wherein the control unit controls the data storage unit to store the encoded data based on the attributes of the multimedia. Since the control is performed so that only the encoded data corresponding to the base layer is stored, when the encoded data is received, decoding or output of the encoded data is performed so that battery power consumption is suppressed. Even if the error is not given, it is possible to reproduce the encoded data while maintaining an appropriate reproduction quality in a state where the battery power has a margin such as after charging the battery.

According to the data reproducing method of the present invention (claim 18), there is provided a data reproducing method for receiving and reproducing encoded data of multimedia data by the electric power supplied from the battery. A receiving step of receiving data, a decoding step of decoding the received encoded data to generate decoded data, a video / audio output step of outputting video and audio based on the decoded data, and the receiving and decoding , And one or more operations of output according to the attribute of the multimedia data, and a control step of limiting the consumption of the battery power to be suppressed. The reduction of battery power consumption is achieved by appropriate operation restrictions according to the attributes of multimedia data. Reproduction of-media data, while maintaining a high reproduction quality of the important data, the effect can be performed over a long period of time is obtained.

According to the present invention (Claim 19), Claim 1
8. In the data reproducing method according to 8, the message exchange step of exchanging a message for acquiring the related data indicating the attribute of the multimedia data and the preference data indicating the preference of the user with a terminal on the network, and the network. Based on the related data acquisition step of acquiring the related data transmitted from the terminal above, the taste data acquisition step of acquiring the taste data transmitted from the terminal on the network, based on the related data and the taste data, And a step of determining the importance of the received encoded data, wherein the control step determines whether the reception, the decoding, and the output are 1 based on the importance of the encoded data determined by the determination step. It is characterized by limiting the above operation, so it is possible to reduce the consumption of battery power. Will be performed by appropriate operation restriction according to the importance of the media data, and video transmission services, it is possible to use a long time in accordance with the preferences of the contents and the user of the multimedia data.

According to the program of the present invention (Claim 20), the program causes a computer to execute the process of receiving and reproducing the encoded data of the multimedia data by the power supplied from the battery, A receiving step of receiving the coded data, a decoding step of decoding the received coded data to generate decoded data, an audiovisual output step of outputting video and audio based on the decoded data, And a control step of limiting one or more operations of reception, decoding, and output so as to suppress the consumption of the battery power according to the attribute of the multimedia data. In the terminal, reduction of battery power consumption is performed by appropriate operation restriction according to the attribute of multimedia data, The reproduction of Ruchi media data, long data reproduction process can be performed over while maintaining a high reproduction quality of the important data, may be implemented by software.

[Brief description of drawings]

FIG. 1 is a data reproducing device 1 according to a first embodiment of the present invention.
It is a block diagram explaining 00a.

FIG. 2 is a data reproducing device 100a according to the first embodiment.
It is a figure explaining operation | movement of (playback terminal), and the flow of the data between server SA and this playback terminal 100a (FIG. (A)),
And the flow of processing that limits the operation of the playback terminal (Fig. (B))
Is shown.

FIG. 3 is a data reproducing device 1 according to a second embodiment of the present invention.
It is a block diagram explaining 00b.

FIG. 4 shows a flow of processing for limiting operations in the data reproducing apparatus 100b according to the second embodiment.

5 is a diagram showing a message displayed when the remaining amount of battery power is low in the data reproducing apparatus 100b according to the second embodiment, and FIG. 5 (a) is a guide message (I) and FIG. Indicates a selection message (II).

FIG. 6 is a data reproducing device 1 according to a third embodiment of the present invention.
It is a block diagram explaining 00c.

FIG. 7 is a data reproducing device 100c according to the third embodiment.
FIG. 3 is a diagram showing a server SA that supplies relevant data and multimedia data to the device.

FIG. 8 is a data reproducing device 100c according to the third embodiment.
It is a figure explaining operation | movement of (playback terminal), and has shown the flow of the data between server SA and this playback terminal 100c.

FIG. 9 is a diagram illustrating an example of a description Drec of related data supplied to the data reproducing device 100c according to the third embodiment.

FIG. 10 is a block diagram illustrating a data reproducing device 100d according to a fourth embodiment of the present invention.

FIG. 11 is a data reproducing device 100d according to the fourth embodiment.
It is a figure explaining an example of description Dred of the relevant data supplied to.

FIG. 12 is a data reproduction device 100d according to the fourth embodiment.
It is a figure explaining an example of description Dfvd of the preference data used by.

FIG. 13 is a diagram for explaining the operation of the data reproducing apparatus (reproducing terminal) 100d according to the fourth embodiment, showing the flow of processing for limiting the operation of the reproducing terminal.

FIG. 14 is a data reproducing device 100d according to the fourth embodiment.
FIG. 6 is a diagram illustrating a process of determining importance of multimedia data in FIG.

FIG. 15 is a data reproducing device 100d according to the fourth embodiment.
3 is a diagram showing an example of a pattern for switching processing for limiting the operation in accordance with the elapsed time from the start of reproduction of multimedia data.

FIG. 16 is a block diagram illustrating a data reproducing device 100e according to a fifth embodiment of the present invention.

FIG. 17 is a data reproducing device 100c according to the third embodiment.
3 is a diagram showing message exchange for acquiring only one of video data and audio data as multimedia data. FIG.

FIG. 18 illustrates a data storage medium (FIGS. (A) and (b)) storing a program for executing the data reproducing apparatus of each of the embodiments by a computer system, and the computer system (FIG. (C)). FIG.

FIG. 19 is a block diagram illustrating a conventional data reproducing device.

[Explanation of symbols]

11 receiving unit 12 memory 13 decoding unit 14 display units 15a, 15b, 15c, 15d, 15e reproduction control unit 16 power supply unit (battery) 17 related data receiving unit 18, 18d related data memory 20 preference data memory 21 judgment unit 23, 23e registration unit 24, 24d input unit 25 storage unit 26 session management unit 100a, 100b, 100c, 100d, 100e
Data reproducing device 110a, 110b, 110c, 110d, 110e
Data playback unit Cs Computer system F frame FD flexible disk FDD flexible disk drive N network SA, SB server

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Claims (20)

[Claims] 1. A data reproducing apparatus that operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data, the receiving unit receiving the encoded data, and the received code. A decoding unit that decodes the encoded data and outputs the decoded data, a video / audio output unit that outputs video and audio based on the decoded data, and an operation of the receiving unit according to the data structure of the encoded data. And a control unit for restricting reception of only a part of the encoded data. 2. The data reproducing apparatus according to claim 1, wherein the control section limits the operation of the receiving section by selecting one of video coded data and audio coded data included in the coded data. A data reproducing device, characterized in that only the data of the above is received. 3. A data reproducing device which operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data, and transmits a command requesting the encoded data to a terminal on a network. A transmitting unit for receiving the encoded data transmitted from the terminal according to the command, a decoding unit for decoding the received encoded data and outputting the decoded data, and a decoding unit based on the decoded data Control of the operation of the video / audio output unit for outputting video and audio and the operation of the transmission unit so as to transmit an instruction requesting only a part of the encoded data according to the attribute of the multimedia data. And a control section for controlling the data reproduction apparatus. 4. The data reproducing apparatus according to claim 3, wherein the transmitting unit is controlled by the control unit according to the attribute of the multimedia data, and the encoded video data and audio data included in the encoded data are included. A data reproducing apparatus, which transmits an instruction requesting only one of encoded data. 5. A data reproducing apparatus which operates by electric power supplied from a battery and receives and reproduces encoded data of multimedia data, the receiving unit receiving the encoded data, and the received code. A decoding unit that decodes the encoded data and outputs the decoded data; a video / audio output unit that outputs video and audio based on the decoded data; and one or more of the receiving unit, the decoding unit, and the video / audio output unit. A data reproducing apparatus, comprising: a control unit that limits the operation so as to suppress the consumption of the battery power according to the attribute of the multimedia data. 6. The data reproducing apparatus according to claim 5, wherein a message exchanging unit for exchanging a message with a terminal on a network to obtain related data related to the multimedia data, and a terminal on the network. And a related data acquisition unit for acquiring related data transmitted from the control unit, wherein the control unit limits the operation based on an attribute of the multimedia data indicated by the related data. apparatus. 7. The data reproducing apparatus according to claim 6, further comprising a data storage unit that stores the received encoded data, wherein the control unit controls the data storage unit based on the related data. A data reproducing apparatus characterized by controlling so as to accumulate only a part of encoded data. 8. The data reproducing apparatus according to claim 7, wherein the control unit controls the data storage unit by selecting one of video coded data and audio coded data included in the coded data. A data reproducing device characterized in that only data is accumulated. 9. The data reproducing apparatus according to claim 5, wherein a message for obtaining related data indicating an attribute of the multimedia data and preference data indicating a user's preference is exchanged with a terminal on a network. A message exchange unit, a related data acquisition unit that acquires related data transmitted from the terminal on the network, a preference data acquisition unit that acquires preference data transmitted from the terminal on the network, the related data and the preference And a determination unit that determines the importance of the received encoded data based on the data, and the control unit performs the operation based on the importance of the encoded data determined by the determination unit. A data reproducing device characterized by limiting the above. 10. The data reproducing apparatus according to claim 9, further comprising a data storage unit that stores the received encoded data, wherein the control unit determines the data storage unit by the determination unit. A data reproducing apparatus which controls so as to store only a part of the encoded data based on the importance of the encoded data. 11. The data reproducing apparatus according to claim 5, wherein the control unit controls the operation according to the remaining amount of the battery power. 12. The data reproducing apparatus according to claim 5, wherein the video / audio output unit displays an image based on the decoded data, and the control unit limits the operation of the video / audio output unit. Is performed so that the luminance level at the time of displaying the image is limited. 13. The data reproducing apparatus according to claim 5, wherein the control unit performs the operation so as to decode or output data for a part of frames of the video coded data included in the coded data. A data reproducing device characterized by limiting. 14. The data reproducing apparatus according to claim 5, wherein the control unit receives, decodes, and outputs only any one of video coded data and audio coded data included in the coded data. As described above, the data reproducing apparatus is characterized in that the above operation is restricted. 15. The data reproducing apparatus according to claim 5, wherein the control unit is based on an attribute of the multimedia.
Decode only high-priority data of the above coded data,
Alternatively, the data reproducing apparatus is characterized in that the above operation is restricted so that the data is output. 16. The data reproducing apparatus according to claim 5, wherein the encoded data is hierarchical encoded data obtained by hierarchically encoding the multimedia data into a basic layer and an additional layer. Yes, the control unit receives, decodes, or outputs only the data corresponding to the base layer of the encoded data,
A data reproducing device characterized by limiting the above-mentioned operation. 17. The data reproducing apparatus according to claim 16, further comprising a data storage unit that stores the received encoded data, wherein the control unit controls the data storage unit based on an attribute of the multimedia. Then, the data reproducing apparatus is characterized in that only the encoded data of the encoded data corresponding to the basic layer is stored. 18. A data reproducing method for receiving and reproducing encoded data of multimedia data by power supplied from a battery, the receiving step of receiving the encoded data, and the received encoded data. A decoding step of decoding the data to generate decoded data, a video / audio output step of outputting video and audio based on the decoded data, and one or more operations of receiving, decoding, and outputting the multimedia data. And a control step of limiting the consumption of the battery power so as to be suppressed according to the attribute of the data reproduction method. 19. The data reproducing method according to claim 18, wherein a message for obtaining related data indicating an attribute of the multimedia data and preference data indicating a user's preference is exchanged with a terminal on a network. A message exchange step, a related data acquisition step of acquiring related data transmitted from the terminal on the network, a preference data acquisition step of acquiring preference data transmitted from the terminal on the network, the related data and taste And a determination step of determining the importance of the received encoded data based on the data, the control step, based on the importance of the encoded data determined by the determination step, the reception , Decryption,
And a method of reproducing data, wherein one or more operations of output are restricted. 20. A program for causing a computer to execute a process of receiving and reproducing encoded data of multimedia data by power supplied from a battery, the receiving step of receiving the encoded data, and the receiving step. A decoding step of decoding the encoded data thus generated to generate decoded data; a video / audio output step of outputting video and audio based on the decoded data; and one or more operations of reception, decoding and output described above. , A control step of limiting the battery power consumption so as to be suppressed according to the attribute of the multimedia data.