Method encoder and decoder for transmitter and receiver for transmitting hierarchiclly structured digital signal

Abstract

A layered transmission method of digital television signals. In a structure of layered transmission in multiple sub-channels, the most important information items in a video sub-channel, especially the respective header information items, are transmitted in a sub-channel with higher error protection. transmitted in the channel. In this way, the specific protection of the title information item is achieved, whereby long-term visual errors caused by the loss of the title information item can be eliminated.

Description

technical field [0001] The invention relates to a method, a coder and a decoder for the transmission of digital signals hierarchically organized into parts, in particular for the layered surface transmission of digital television signals. Background technique [0002] Digital transmission methods have an abrupt response, especially in surface channels. In fact, as long as the received field strength allows error-free decoding of the digitized data stream, a stable high-quality digital signal will be produced. However, if the field strength is less than a minimum value, then the result is a sudden increase in the bit error rate, which in the extreme case will result in a complete failure of program reception. In order to avoid this, important signal parts, such as the coarse frame of an image, are provided with higher error protection, ie a data hierarchy is introduced. Video signals containing both important and minor picture components are produced in this way, with the r...

AI Technical Summary

Problems solved by technology

Nevertheless, even if the bit error rate of each subchannel is very low, the loss of particularly important information items in the video signal will still lead to the failure of the picture due to the long-term obvious error caused by the prediction commonly used in video coding

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