TV Receiver Wireless Transmission Channel Switching
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Solution Overview
Problem
TV receivers using the 5 GHz-band for wireless transmission face delays and interruptions due to Dynamic Frequency Selection operations, causing users to miss the start or intermediate portions of programs when channels shared with radar are used, as existing techniques fail to efficiently handle channel changes and radar wave interference.
Innovation Solution
A TV receiver design that includes a tuner unit with a recorder/player to record programs and a wireless transmitter capable of sharing channels with commercial radar, allowing for time-shift playback and seamless channel changes to prevent interruptions, using DFS operations to detect and switch channels while maintaining priority on 5 GHz-band regular-wave channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DFS operations are performed to select channels shared with radar, then wireless transmission can use 5 GHz-band channels, but channel selection takes considerable time causing transmission delays
Solution Approach 1:
The system performs channel selection and radar wave detection in advance before program transmission begins. The wireless receiver pre-selects available channels and detects radar waves during a predetermined period before the program starts, so that when transmission begins, the channel is already prepared and no time loss occurs during actual transmission.
2Reliability
If radar wave detection is performed continuously during transmission, then interference with radar equipment is avoided, but transmission interruptions occur when radar waves are detected
Solution Approach 1:
The system performs radar wave detection in advance during a predetermined period before program transmission begins. Once detection is complete and the channel is confirmed safe, continuous transmission can proceed without interruptions for radar detection during the actual program broadcast.
Solution Approach 2:
The patent extracts the radar wave detection function from the transmission process itself and separates it into a preliminary phase. By taking out detection before transmission, the system avoids the contradiction where detection must occur continuously during transmission, thereby preventing transmission interruptions while maintaining radar interference avoidance.
3Adaptability or versatility
If channel changes are performed during program transmission, then unused channels are selected, but users miss intermediate portions of programs
Solution Approach 1:
The system completes all channel selection and radar detection operations during a predetermined period before program transmission begins. This preliminary action ensures that when the program starts, the optimal channel is already selected and locked in, preventing any channel changes during program broadcast and thus avoiding loss of intermediate program content.
Data Source
AI summary
A TV receiver transmits video data from its tuner unit to its monitor unit via wireless transmission by using a channel shared with radar. When the tuner unit receives a program to be viewed, a recorder/player starts recording of the received program. When wireless transmission of the received program cannot be started on time at the program start time because of detecting an unused channel for wireless transmission, or when a radar wave in the shared channel is detected after starting wireless transmission and then wireless data transmission is interrupted, the recorder/player plays back on a time-shift basis the program recorded on the recording medium, and the program data played back is transmitted to the monitor unit. The TV receiver is capable of preventing the user from missing a program that he wants to view even when wireless data transmission is interrupted.