Moving Picture Transmission Channel Switching Delay Reduction

Solution Overview

Problem

Existing moving-picture transmission systems fail to swiftly start displaying a new video source when users switch channels or switch video sources, due to delays in error correction and packet dropout issues, particularly in wireless IP networks.

Innovation Solution

A method and system that includes a delivery apparatus and a receiving apparatus connected by a network, where the receiving apparatus sends a source switching command to the delivery apparatus, and uses error correcting means to correct packets while displaying a frozen frame until corrected data is produced, allowing swift switching and display of the new video source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If error correction is applied to moving picture data in wireless IP networks, then packet dropout is prevented and transmission quality is improved, but transmission delay increases and channel switching speed decreases

Engineering Contradiction:

Improvetransmission qualityVSAvoidchannel switching delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-decoding adjacent channel data into images before channel switching is requested. When a user changes channels, the previously decoded images are immediately displayed, eliminating the need to wait for real-time decoding during channel switching. This pre-processing approach resolves the contradiction by preparing data in advance, thus maintaining high transmission quality through error correction while achieving fast channel switching display.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If error correction code amount is increased to compensate for packet dropout, then data transmission quality is improved, but transmission delay increases

Engineering Contradiction:

Improvedata transmission qualityVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-decoding adjacent channel data into images before channel switching is requested. When a user changes channels, the previously decoded images are immediately displayed, eliminating the need to wait for real-time decoding during channel switching. This pre-processing approach resolves the contradiction by preparing data in advance, thus maintaining high transmission quality through error correction while achieving fast channel switching display.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7681224B2Method and system for transmitting data of moving picture, and apparatus for delivering and receiving data of moving picture

Publication Date: 2010.03.16 MAXELL LTD

AI summary

In the transmission of a moving picture, when the user switches video sources (for example, switches channels or starts reproducing a recorded program), the selected video source can be swiftly started to display. Immediately after a delivery apparatus makes a video source be selected by switching, a receiving apparatus causes a selector to select the video packets transmitted not through an error corrector and to supply them to a decoder and it controls the decoder to generate a frozen frame from the video packets and to supply it to a display where it is displayed. The selector is controlled to produce the error-corrected video data after a counter counts a delay time that the video packets undergo in the error corrector. Thus, the moving picture can be seamlessly displayed, and the delay in the error corrector can be apparently eliminated.