Data transmitting device, data receiving device, and data recording device

A data transmitting device which transmits data through a network, comprising:

• reading means for reading out multiplexed data which is recorded in sector units of a prescribed data size in a recording medium, for each sector;
• dividing means for dividing multiplexed data corresponding to each sector read out by the reading means into data units, to generate divided pack data corresponding to divided packs as the data units, the data units having a data size which is determined according to a readout speed at which the data is read out from the recording medium and a frequency band which is used for the transmission of the data;
• packet generating means for adding header information to respective divided pack data, to generate packet data corresponding to packets as data transmission units;
• and
• transmitting means for transmitting the respective packet data to be output toward the network as a multiplexed stream by using the frequency band.

A data transmitting method for obtaining a frequency band having a maximum frequency band width permitted according to a condition of a network, and performs a transmission of data using the obtained frequency band during a transmission cycle period set up repeatedly, comprising:

• multiplexing step for receiving plural kinds of coded data, and multiplexing these coded data to generate a multiplexed coded stream having a predetermined data structure;
• dividing step for dividing the multiplexed coded stream into data units having a data size which is determined according to the frequency band width of the obtained frequency band and the length of transmission cycle period to generate divided pack data corresponding to divided packs as the data units;
• packet generating step for adding header information to respective divided pack data to generate packet data corresponding to packets as data transmission units;
• and
• transmitting step for performing transmitting process in which the respective packet data is output toward the network by using the obtained frequency band,
• wherein the packets as data transmission units have a data size which is smaller than an amount of data that can be transmitted during one transmitting cycle period, the amount of data being determined according to the obtained frequency band.

A data transmitting method for transmitting data toward a network, comprising:

• reading step for reading out multiplexed data which is recorded in sector units of a prescribed data size in a recording medium, for each sector;
• dividing step for dividing data corresponding to each sector read out in the reading step in data units, to generate divided pack data corresponding to divided packs as the data units, the data units having a data size which is determined according to a readout speed at which the data is read out from the recording medium and a frequency band which is used for the transmission of the data;
• packet generating step for adding header information to respective divided pack data, to generate data corresponding to packets as data transmission units;
• and
• transmitting step for transmitting the respective packet data to be output toward the network by using the obtained frequency band.