| 摘要 |
A data output device for use in a VOD system that distributes program data upon requests occurring at any time. In the data output device (1), video data to be distributed are transferred to a recording device in an output unit (10-i). The recording device is accessed at a high speed in a period of time which is a fraction of the real time of the video data, and a plurality of places that are separated from one another by a predetermined period of time are reproduced simultaneously. Desirably, an error correction code has been recorded in advance at a moment of recording the data in the recording device. At the time of reproduction, the data that have been transferred to the recording device are read out in physical blocks at a high speed, are formatted by, for example, adding header data through a formatter (20-i) to form ATM cells, and are output to a transmission line via a data exchanger (60). This makes it possible to simplify the constitution of the format conversion means, and to provide a data output device having a format conversion means that is simply constructed and operates at high speeds enabling the data to be transmitted at high speeds in a multi-channel fashion. |
