Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1998-06-18
2001-12-11
Olms, Douglas (Department: 2661)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S390000
Reexamination Certificate
active
06330252
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the broadcasting of data through a transmission path, and, more particularly, to the broadcasting of a large volume of data in a short time.
In general, high speed transmission of data using a digital transmission path can be performed by increasing the transmission capacity of the transmission path, or by compressing the data to be transmitted. On the other hand, high speed transmission of data using an analog access line has been performed by improving the transmitting speed of a modem.
On the other hand, in regard to a system for broadcasting data from a broadcasting station to a plurality of receiving apparatus, a technology for transmitting motion picture data from the beginning in response to the demand of a viewer, called video-on-demand, also has been used. In addition to this, there is also a broadcasting service called near-on-demand, which shortens the waiting time of a viewer by using a plurality of transmitting paths and by transmitting motion picture data to each transmitting path by shifting the transmitting time so as to capture the motion picture data by selection in the receiving apparatus of one of the transmitting lines through which the motion picture data is transmitted in a sequential order.
For example, regarding video-on-demand systems, Japanese Patent Laid-open No. 1-279645 (1989) discloses a method for improving transmission delay when obtaining decomposed data in respective channels. Japanese Patent Laid-open Nos. 7-143086(1995), 5-35624(1993), 7-273805(1995) disclose a transmission of decomposed data and a method of recovering the data in respective channels, and Japanese Patent Laid-open No. 7-154448 (1995) discloses a method of adding a number representing an order in a sequence of decomposed data when decomposing the data for transmission in respective channels.
SUMMARY OF THE INVENTION
In general, in the conventional technology of high speed data transmission, the receiving apparatus finds a first code attached to a data block on the transmitting path and captures the objective data based on the first code. Therefore, if the first code is missed, the objective data cannot be received until the next retransmitting time when the data block with the first code is transmitted again. Accordingly, the waiting time until receipt of the objective data sometimes becomes long.
According to the technologies of the video-on-demand and the near-on-demand, shortening of the waiting time can be expected, but the transmitting speed is limited by the transmission capacity of each transmitting path being used.
An object of the present invention is to provide a data broadcasting system which is capable of shortening the waiting time until objective data is received in a receiving apparatus and for transmitting the objective data at a faster transmitting speed.
The object of the present invention can be attained by providing a data broadcasting system comprising data broadcasting equipment for broadcasting data through a plurality of transmission paths and at least one data receiving equipment for receiving the data from the plurality of transmission paths, wherein the data broadcasting equipment comprises a data transmitting means for transmitting the data to be broadcast by shifting the data in time respectively through the plurality of transmission paths; and the data receiving equipment comprises a data receiving means for reconstituting the data to be broadcast by receiving parts of the data to be broadcast which appear on each of the transmission paths in parallel from the plurality of transmission paths until at least all parts composing the data to be broadcast are received, and by rearranging the parts of the data to be broadcast as received from each of the transmission paths.
Further, the object of the present invention also can be attained by providing a data broadcasting system comprising data broadcasting equipment for broadcasting data through a plurality of transmission paths and at least one data receiving equipment for receiving the data from the plurality of transmission paths, wherein the data broadcasting equipment comprises a data transmitting means for decomposing the data to be broadcast into a plurality of blocks and for transmitting each of the decomposed blocks through each of the plurality of transmission paths in parallel; and the data receiving equipment comprises a data receiving means for reconstituting the data to be broadcast by receiving the block transmitted on each of the transmission paths in parallel from the plurality of transmission paths until at least all blocks composing the data to be broadcast are received, and by rearranging each of the blocks as received from each of the transmission paths.
In both of the data broadcasting systems, the receiving equipment can receive data broadcast at a high speed using a plurality of transmission paths. Further, the waiting time required to receive data can be shortened compared to a conventional system by repeating transmission of data by the data transmitting equipment.
REFERENCES:
patent: 3726990 (1973-04-01), Adler et al.
patent: 5357276 (1994-10-01), Banker et al.
patent: 5675509 (1997-10-01), Ikami et al.
patent: 5926206 (1999-07-01), Mihara et al.
patent: 5949472 (1999-09-01), Dang et al.
patent: 6088455 (2000-07-01), Logan et al.
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Nguyen Brian
Olms Douglas
LandOfFree
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