Digital TV Receiver Multi-Tuner Frequency Handover
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Solution Overview
Problem
In regions where ATSC 3.0 broadcast signals from multiple stations overlap, existing receivers face challenges in managing signal reception and quality, leading to potential loss or degradation of primary signals, necessitating a method to seamlessly switch between frequencies to maintain uninterrupted service.
Innovation Solution
A digital television receiver system utilizing multiple tuners to scan for duplicate services across different frequencies, allowing for automatic switching to a secondary signal when primary signal quality degrades or is lost, and using secondary non-real-time data to maintain service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single tuner is used to receive broadcast signals, then device complexity is reduced, but signal reliability deteriorates when primary signal is lost or degraded in boundary regions
Solution Approach 1:
The patent applies preliminary action by having the second tuner scan for and acquire secondary NRT data from alternative frequencies before the primary signal is completely lost. This advance preparation ensures that when a frequency change is needed, the receiver can immediately use pre-acquired secondary data, maintaining service continuity without interruption.
Solution Approach 2:
The patent segments the signal reception function into two independent tuners: a first tuner for primary signal reception and a second tuner for scanning and backup signal acquisition. This segmentation allows simultaneous operation of both tuners, enabling the receiver to maintain primary service while preparing backup options, thus improving reliability without requiring complete system redesign.
2Reliability
If the receiver scans for duplicate services on alternative frequencies, then service continuity is improved, but data loss occurs during frequency switching due to NRT data interruption
Solution Approach 1:
The system performs preliminary acquisition of secondary NRT data from alternative frequencies before switching is required. By having the second tuner scan and store backup data in advance, the receiver ensures that when frequency switching occurs, the secondary data is already available to immediately replace any lost primary NRT data, preventing information gaps.
Solution Approach 2:
The second tuner acts as an intermediary that acquires and holds backup NRT data from alternative frequencies. This intermediary data store serves as a buffer that can immediately supply replacement data when the primary frequency switch causes NRT data interruption, thus preventing information loss during transitions.
3Reliability
If multiple tuners are used to scan and switch frequencies, then signal quality is maintained, but device complexity and cost increase
Solution Approach 1:
The reception function is segmented into two independent tuner units with distinct roles: the first tuner handles primary signal reception while the second tuner performs scanning and backup acquisition. This segmentation enables parallel operation without functional conflicts, maintaining signal quality through hot-swappable frequency switching while keeping each tuner module relatively simple and standardized.
Solution Approach 2:
The second tuner is designed with multi-functionality, serving both as a scanner for alternative frequencies and as a backup data source. This universal design allows the same hardware component to perform multiple tasks (scanning, data acquisition, and standby reception), reducing overall system complexity compared to having dedicated separate systems for each function.
4Reliability
If the receiver switches to a second signal when primary signal degrades, then service interruption is reduced, but data retrieval time increases without pre-acquired secondary data
Solution Approach 1:
The system performs preliminary acquisition of secondary NRT data from alternative frequencies before switching is required. By having the second tuner scan and store backup data in advance, the receiver ensures that when frequency switching occurs, the secondary data is already available in memory, enabling immediate replacement of lost primary data without additional retrieval delay.
Data Source
AI summary
Techniques are described for expanding and/or improving the Advanced Television Systems Committee (ATSC) 3.0 television protocol in robustly delivering the next generation broadcast television services. In a boundary region between first and second broadcast stations in which a receiver can pick up signals from both stations, a primary tuner presents a demanded service while a secondary tuner scans for duplicate transmissions of the service and tunes to it if found. When the primary tuner loses signal, it tunes to the frequency of the secondary tuner and acquires any missing NRT data recorded from the secondary tuner prior to the handover.