Multimedia-data transmission system, apparatus and method
First Claim
1. A multimedia-data transmission system for transmitting multimedia data via a network, said system comprising:
- client for assigning multimedia data to be transmitted;
at least one server for storing multimedia data in a distributed state;
at least one receiver corresponding to said at least one server, each for acquiring multimedia data stored in corresponding ones of said at least one server in accordance with the assignment;
multiplexer for multiplexing the acquired multimedia data based on time-management information added to the media data; and
transmission means for transmitting the multiplexed multimedia data obtained as a result of the multiplexing to said client, serving as a source of the assignment.
1 Assignment
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Accused Products
Abstract
In a system for transmitting multimedia data including video data, audio data, graphic data, text data and the like via a network, sets of media data are stored in a plurality of servers in a distributed state. When requested multimedia data is assigned from a transmitter, necessary sets of data from among media data stored in the servers in a distributed state are acquired by corresponding receivers in accordance with the assignment. A synchronization control unit and a multiplexer multiplex the acquired media data based on time stamps of the data, and transmit multimedia data after the multiplexing to a client which has assigned the multimedia data. According to such a configuration, distributed multimedia servers can be constructed without taking into consideration of influence by the effective rates of transmission channels from the respective servers.
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Citations
10 Claims
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1. A multimedia-data transmission system for transmitting multimedia data via a network, said system comprising:
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client for assigning multimedia data to be transmitted;
at least one server for storing multimedia data in a distributed state;
at least one receiver corresponding to said at least one server, each for acquiring multimedia data stored in corresponding ones of said at least one server in accordance with the assignment;
multiplexer for multiplexing the acquired multimedia data based on time-management information added to the media data; and
transmission means for transmitting the multiplexed multimedia data obtained as a result of the multiplexing to said client, serving as a source of the assignment. - View Dependent Claims (2, 3, 4)
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5. A transmission method for acquiring multimedia data from at least one server storing multimedia data in a distributed state, and for transmitting multimedia data to client, via a network, said method comprising:
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an acquisition step of acquiring the multimedia data from the at least one server in accordance with assignment of multimedia data from the client;
a multiplexing step of obtaining multiplexed multimedia data by multiplexing the acquired multimedia data based on time management information added to the acquired multimedia data; and
a transmission step of transmitting the multiplexed multimedia data obtained as a result of the multiplexing to the client, serving as a source of the assignment. - View Dependent Claims (6, 7, 8)
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9. A control program for realizing transmission control for acquiring multimedia data from at least one server storing media data in a distributed state, and for transmitting multimedia data to client, via a network by a computer, said control program comprising:
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code for acquiring the multimedia data from the at least one server in accordance with assignment of multimedia data from the client means;
code for multiplexing to obtain multimedia data by multiplexing the acquired multimedia data based on time-management information added to the acquired multimedia data; and
code for transmitting the multiplexed multimedia data obtained as a result of the multiplexing to the client, serving as a source of the assignment.
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10. A transmission apparatus for acquiring multimedia data from at least one server storing media data in a distributed state, and for transmitting multimedia data to client, via a network, said apparatus comprising:
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acquisition means for acquiring the multimedia data from said at least one server in accordance with assignment of multimedia data from said client;
multiplexer means for obtaining multimedia data by multiplexing the acquired multimedia data based on time-management information added to the acquired multimedia data; and
transmission means for transmitting the multiplexed multimedia data obtained as a result of the multiplexing to said client, serving as a source of the assignment.
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Specification