Fast Adaptive Channel Changing in Digital Broadcast Receivers
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Solution Overview
Problem
Digital broadcast reproducing apparatuses experience a screen blank time of 1.8 to 5 seconds when changing channels, causing user inconvenience and potentially leading to preference for analog TV over digital TV.
Innovation Solution
A fast adaptive channel changing method and apparatus that pre-signal processes adjacent channels using a signal processing unit, channel list managing unit, and main control unit to generate and manage channel data, allowing immediate display of changed channels without screen blank time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the digital broadcast reproducing apparatus performs signal processing operations (tuning, demodulation, decoding) when changing channels, then the channel can be changed accurately, but a screen blank time of 1.8 to 5 seconds occurs causing user inconvenience
Solution Approach 1:
The patent applies preliminary action by pre-signal-processing adjacent channels before the user actually changes channels. The main control unit identifies adjacent channels from the channel list and performs signal processing (tuning, demodulation, decoding) in advance, so that when channel changing is requested, the processed data is already available in the buffer, eliminating screen blank time while maintaining accurate channel changing
2Speed
If the apparatus processes multiple channel signals simultaneously, then channel changing speed improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the channel list into groups based on adjacent channel relationships. Instead of processing all channels simultaneously or sequentially, the system segments channels into manageable groups (current channel and its adjacent channels) and processes them in an organized manner, reducing overall system complexity while improving channel changing speed
Data Source
AI summary
A fast adaptive channel converting method and apparatus, and a computer readable recording medium having recorded thereon a program to execute the fast adaptive channel converting method. The fast adaptive channel converting method includes generating adjacent channel data by pre-signal processing an adjacent channel signal of a reference channel, receiving a channel change request from a user, searching for channel data corresponding to a changed channel in the adjacent channel data, and reproducing the searched channel data. Unlike a conventional technology, the fast adaptive channel changing apparatus and method prevents a screen blank time that may occur while changing a channel in a digital broadcast receiving apparatus, and thus boredom or inconvenience of a user can be removed. Also, when a channel is changed by using a preferred channel list, a channel search time can be remarkably reduced, and the user can easily watch a program of a preferred channel.