RF Automatic Gain Controller for Fast Channel Search
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Solution Overview
Problem
Broadcast receiving devices require a long time for channel search due to the need to check all frequency bands, and existing methods either require user selection or additional circuits, leading to potential errors or inefficiencies.
Innovation Solution
A broadcast receiving device equipped with an RF automatic gain controller that performs automatic gain control and a controller to detect signal presence or absence in preset frequency bands, allowing channel search only in bands where signals exist, thereby reducing search time and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel search is performed for all frequency bands, then comprehensive channel detection is achieved, but channel search time increases significantly
Solution Approach 1:
The patent applies preliminary action by performing automatic gain control (AGC) before channel search to detect the presence of broadcast signals in different frequency bands. The controller adjusts the gain value according to input signal magnitude and detects signal presence based on whether the gain value changes, allowing the system to identify which frequency bands contain signals before performing actual channel search, thus avoiding unnecessary searches in empty bands
Solution Approach 2:
The patent segments the channel search process into two phases: first detecting signal presence in frequency bands using AGC, then performing channel search only in bands where signals are detected. This segmentation divides the原本 comprehensive but time-consuming full-band search into targeted searches in specific frequency bands, reducing overall search time while maintaining detection completeness
2Loss of time
If user selects broadcast signal frequency band, then channel search time is reduced, but selection errors may occur
Solution Approach 1:
The patent applies self-service by enabling the broadcast receiving device to automatically detect signal presence in frequency bands through AGC without requiring user input. The controller autonomously adjusts gain values, detects changes indicating signal presence, and determines which frequency bands contain broadcast signals, eliminating the need for manual user selection while ensuring accurate detection
Solution Approach 2:
The patent uses feedback mechanisms where the controller monitors changes in gain values produced by the AGC circuit to detect signal presence. The system continuously adjusts gain according to input signal magnitude and uses the resulting gain changes as feedback to determine whether broadcast signals are present in each frequency band, enabling reliable automatic detection
3Productivity
If separate circuit is added to detect signal presence, then channel search efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the existing automatic gain control circuit perform an additional function of signal presence detection. The AGC circuit, originally designed for gain adjustment, is utilized to detect whether broadcast signals are present in frequency bands by monitoring gain value changes, thereby eliminating the need for separate detection circuits while improving channel search efficiency
Solution Approach 2:
The patent merges the signal presence detection function with the existing automatic gain control circuit. Instead of adding a separate detection circuit, the system combines both functions into the AGC circuit, which simultaneously performs gain adjustment and signal presence detection by monitoring whether gain values change when adjusted, reducing device complexity while maintaining efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes channel search time by automatically detecting existing frequency bands and performing searches only in those bands, enhancing search efficiency and accuracy without the need for additional circuits.
Implementation Method 1
an RF automatic gain controller configured to perform automatic gain control to adjust a gain value according to an input magnitude of an RF signal
Implementation Method 2
a controller configured to detect the presence or absence of a signal in a preset frequency band based on whether the gain value is changed
Data Source
AI summary
The present disclosure relates to a broadcast receiving device that minimizes the time required for channel search and a display device including the same, and the broadcast receiving device includes an RF automatic gain controller configured to perform automatic gain control to adjust a gain value according to an input magnitude of an RF signal, and a controller configured to detect the presence or absence of a signal in a preset frequency band based on whether the gain value is changed, and to perform channel search in the preset frequency band according to the presence or absence of a signal in the preset frequency band.