Digital Broadcasting Reception Apparatus Quick Channel Switching
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Solution Overview
Problem
In digital broadcasting systems using a time division multiplexing scheme, users face long wait times for channel switching due to the need to receive and demodulate data for the next cycle before switching can occur, making immediate channel changes inconvenient.
Innovation Solution
A digital broadcasting reception apparatus and method that includes a receiver, demodulator, storage unit, and controller to store and retrieve digital broadcasting data for unselected channels, allowing for immediate switching by demodulating and outputting stored data when a channel change is requested.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the digital broadcasting reception apparatus waits to receive and demodulate data for the next cycle before switching channels, then channel switching accuracy is maintained, but channel switching speed deteriorates
Solution Approach 1:
The patent applies preliminary action by receiving and storing digital broadcasting data for multiple channels in advance during idle time periods. When a user requests channel switching, the apparatus can immediately retrieve and output the pre-received data from the requested channel without waiting for the next broadcast cycle, thus eliminating user waiting time while maintaining switching accuracy.
2Speed
If the apparatus stores digital broadcasting data for multiple channels, then channel switching speed improves, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the data storage structure to serve multiple purposes: it stores broadcasting data not only for channel switching but also for pause function, rewind, and fast-forward operations. This universal storage mechanism reduces overall system complexity by consolidating multiple functions into a single data management framework.
Solution Approach 2:
The patent introduces a buffer memory as an intermediary component between the data reception unit and the output unit. This buffer temporarily stores incoming broadcasting data, allowing the system to decouple the reception process from the output process, thereby simplifying the control logic for channel switching and other time-shift functions.
3Reliability
If the apparatus receives and processes all channel data cyclically, then data completeness is maintained, but processing time increases
Solution Approach 1:
The patent applies extraction by selectively extracting only the data from the requested channel when a channel switching request is made, rather than processing all channel data cyclically. The buffer memory stores data from multiple channels, and the control unit retrieves only the specific channel data needed, thus maintaining data completeness while significantly reducing processing time.
Data Source
AI summary
Disclosed is a method for switching broadcasting channels in a digital broadcasting reception apparatus employing a time division multiplexing scheme. The method includes receiving and demodulating digital broadcasting data according to at least one broadcasting channel serviced in a frequency band used by the broadcasting station when the broadcasting channel of a predetermined broadcasting station is selected, outputting the digital broadcasting data of the selected broadcasting channel among the demodulated digital broadcasting data according to the broadcasting channels, storing digital broadcasting data according to the broadcasting channels except the selected broadcasting channel, and when there is a request for switching one of the broadcasting channels serviced by the broadcasting station, retrieving and outputting the digital broadcasting data of the requested broadcasting channel among the stored data. Since it is possible to quickly switch broadcasting channels in the apparatus during output of the digital broadcasting, the convenience for users is improved.