Data transmission method and apparatus

摘要

A data transmission method and apparatus that both codes a moving picture and records the coded moving picture data, transmitting the coded moving picture data immediately to a receiving terminal that is not a latecomer terminal from among a plurality of receiving terminals and begins transmission to a latecomer receiving terminal from recorded past moving picture data. This transmission method enables the communication band to be used efficiently, and further, at low cost, in addition to which playback can begin promptly at the receiving terminals.

主权项

1. A data transmission apparatus, comprising:
a storage unit that stores an intra-coded frame obtained by intraframe prediction coding, and an inter-coded frame obtained by interframe prediction coding and following the intra-coded frame stored in the storage unit; a receiver that receives a first transmission request for frames from a first receiving terminal and a second transmission request for frames from a second receiving terminal; a circuit that identifies a transmission time of a frame to be transmitted to the first receiving terminal after the reception of the second transmission request and before a transmission of a next intra-coded frame, wherein the transmission time corresponds to a transmission time interval for transmitting frames to the first receiving terminal and a transmission time of a frame that is transmitted before a reception of the second transmission request; and a transmitter that transmits to the second receiving terminal, by the transmission time identified by the circuit, frames according to the frames stored in the storage unit, if the second transmission request is received while the transmitter is transmitting frames to the first receiving terminal, wherein the transmitter transmits a frame that is transmitted at the transmission time identified by the circuit, to both the first receiving terminal and the second receiving terminal.