Data transmission apparatus and data transmission method

Details Data transmission apparatus and data transmission method Data transmission apparatus and data transmission method

1998-02-12

1999-12-28

Patel, Ajit

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370476, 370465, H04L 1288, H04L 1256

Patent

active

060090987

ABSTRACT:
A data transmission apparatus suitable for use for a VOD system etc. able to supply program data in response to a request made at any time. In the data transmission apparatus (1) of the present invention, the video data to be supplied is first transferred to a high speed accessible recording apparatus in the transmitter (10.sub.-i). This recording apparatus for example performs high speed access in less than a fraction of the real time of the video data and reproduces several locations predetermined time intervals apart simultaneously. At this time, preferably an error correction code is pre-recorded at the time of recording in the recording apparatus. At the time of reproduction, the apparatus reads data from the recording apparatus at a high speed in units of physical blocks of the transfer data of the recording apparatus, adds header information etc. by the formatter (20.sub.-i) to make the formats match, produces ATM cells, and outputs them through the data exchange (60) to the transmission lines. Due to this, it is possible to provide a data transmission apparatus with a simpler configuration of the format converting device, having a format converting circuit able to perform high speed processing with a simple configuration, able to increase the rate of transmission, and able to easily handle multiple channels.

REFERENCES:
patent: 5260936 (1993-11-01), Bardet et al.
patent: 5550825 (1996-08-01), McMullan, Jr. et al.
patent: 5583574 (1996-12-01), Tanaka et al.

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