Data transmission system, receiving terminal and data packet recovery method thereof

Abstract

The present invention provides a data transmission system used for transmitting television signal, a receiving end and a data package recovering method thereof, wherein the data package recovering method comprises the steps of: dividing the television signal to be transmitted to a plurality of data blocks by the transmitting end, and adding characteristic serial numbers into the data blocks for forming a plurality of data packages; detecting the received data package by the receiving end, and confirming the lost data package according to the characteristic serial numbers in the data package; and substituting the lost data package by the data package adjacent with the characteristic serial number of lost data package by the receiving end according to the relativity between the data packages, wherein the characteristic serial number comprises the data style of data package, the affiliated frame and / or field, and the position information of corresponding data block in the affiliated frame and / or field. Therefore the invention can recover the lost data with a simple substitution mode. Furthermore the complexity of system can be relatively reduced and the load of transmission channel is alleviated.

Description

technical field [0001] The invention relates to data packet restoration technology, in particular to a data transmission system applied to television signals, a receiving end thereof, and a data packet restoration method. Background technique [0002] In the analog TV transmission system, a frame of image is divided into odd and even fields for scanning. When transmitting TV signals, each frame of image is divided into several blocks, such as 16×16 or 25×25, and a sequence number is inserted into each block to form a data packet. The sequence number is formed according to the time axis Sequence number. During transmission, the data packets with sequence numbers are sequentially transmitted to a receiving end, such as a television receiver, through a sending end, such as a television transmission tower. After receiving the data packets, the receiving end sorts and reorders them to restore the TV signal. [0003] However, since the TV signal is restricted by a transmission ...

AI Technical Summary

Problems solved by technology

Redundant data generally requires the use of certain algorithms, such as interleaving technology, which puts forward higher requirements on the system integration and processing capabilities of the sending end and receiving end, increasing the complexity and cost of the sending end and receiving end

In addition, the bandwidth of the transmission channel of the analog TV signal is limited. If in the transmission process, in addition to its own TV signal (including video signal and audio signal), the sending end also needs to transmit redundant data (packet ), which invisibly increases the burden on the transmission channel, which will inevitably affect the transmission capacity of the transmission channel

Furthermore, the size of the redundant data (package) is actually directly proportional to its error correction capability, the stronger the required error correction capability, the better the restoration of the TV signal, and the more data in the redundant data (package). The larger its proportion in the entire transmission data (relatively, the smaller the proportion of TV signals), the lower the efficiency of data transmission, the heavier the burden on the transmission channel, and the transmission of a certain amount of TV signals. Signal takes longer

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