Digital Tuner Channel List Formation with Frequency Offset Alignment
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Solution Overview
Problem
Conventional digital terrestrial broadcast receiving apparatuses fail to accurately recognize and tune digital broadcasting signals from adjacent countries due to differences in channel arrangements, leading to incorrect frequency band alignment with tuner filters and inadequate analog interference elimination.
Innovation Solution
A method and apparatus that select a physical channel number and country/region, verify the center frequency alignment, judge frequency errors, and acquire program allocation information to form a channel list based on the received digital broadcasting signal, ensuring correct frequency offset and filter settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional digital terrestrial broadcast receiving apparatuses use fixed channel arrangements based on their own country's standards, then they can operate correctly within their domestic broadcasting system, but they fail to accurately recognize and tune digital broadcasting signals from adjacent countries with different channel arrangements
Solution Approach 1:
The receiving apparatus dynamically adjusts the channel arrangement parameters based on the detected signal source country. The controller automatically selects different center frequencies and frequency offsets from stored channel arrangement data corresponding to different countries, enabling the system to adapt its tuning parameters in real-time rather than using fixed domestic standards
Solution Approach 2:
The system changes key frequency parameters (center frequency and frequency offset) based on the identified broadcasting country. By storing multiple sets of channel arrangement parameters for different countries and selecting the appropriate set based on signal detection, the apparatus can accurately align with signals from various countries despite their different frequency standards
2Reliability
If the receiving apparatus uses incorrect frequency offsets for adjacent country signals, then the tuning operation may capture some signal range, but the frequency band does not align properly with the tuner's filter characteristics, degrading demodulation output
Solution Approach 1:
The system pre-stores accurate channel arrangement data including center frequencies and frequency offsets for multiple countries before actual signal reception. This preliminary preparation of frequency parameters allows the apparatus to quickly and accurately configure the correct frequency offset when a foreign signal is detected, avoiding the need for trial-and-error tuning and ensuring proper alignment with filter characteristics from the start
3Ease of operation
If the receiving apparatus cannot identify the broadcasting country, then it cannot select the appropriate channel arrangement, leading to inability to form accurate channel lists and set proper analog interference eliminating filters
Solution Approach 1:
The system employs feedback mechanisms where the detected signal characteristics (frequency, modulation type, signaling data) are continuously monitored and compared against known patterns for different countries. The controller uses this feedback to identify the broadcasting country and automatically select the corresponding channel arrangement, enabling automatic channel list formation and proper filter settings without user intervention
Data Source
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AI summary
Even under such an environment that countries are located adjacent to each other in which channel arrangements of digital broadcasting systems thereof are different from each other, a channel list is formed by employing suitable center frequencies of the digital broadcasting signals and frequency offsets. A channel list forming method is provided with: a physical channel number selecting step (S103) for selecting a physical channel number (M); an operation region selecting step (S104) for selecting an operation region of a physical channel; an operation confirming step for judging whether or not a selected physical channel number (M) has been operated in the selected region; a step (S105) for receiving a digital broadcasting signal; a broadcasting signal judging step (S107) for judging whether or not the digital broadcasting signal has been contained in the physical channel; a frequency error judging step (S112) for judging whether or not a frequency of the received digital broadcasting signal is located within a defined range of a frequency error; a step (S113) for acquiring program allocation information of the received broadcasting signal; and a channel list forming step (S117) for forming a channel list based upon the acquired program allocation information.