Broadcast Channel Search Using Signal Strength and AGC Skipping
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Solution Overview
Problem
Existing broadcast signal receiving apparatuses require demodulation and decoding of all channels, including those without signal presence, leading to prolonged channel searching times.
Innovation Solution
A method and apparatus that determine signal strength and automatic gain control signals to skip demodulation of channels with insufficient signal strength and excessive automatic gain control, thereby reducing unnecessary demodulation and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If demodulation and decoding are performed for all channels, then reliable channel identification is achieved, but channel searching time is prolonged
Solution Approach 1:
The patent applies preliminary action by performing preliminary channel evaluation using signal strength measurement and automatic gain control (AGC) value analysis before committing to full demodulation and decoding. This preliminary assessment allows the system to identify and skip channels that are unlikely to contain valid broadcast signals, thereby reducing overall searching time while maintaining reliable channel identification for channels that pass the preliminary criteria.
Solution Approach 2:
The patent implements skipping by enabling the receiver to rapidly bypass channels that fail the preliminary signal strength and AGC threshold checks without performing full demodulation and decoding. This skipping mechanism allows the system to rush through obviously invalid channels, significantly reducing channel searching time while preserving the ability to thoroughly process channels that meet the preliminary requirements.
2Measurement precision
If demodulation is performed for all channels, then accurate signal detection is achieved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the channel processing workflow into distinct stages: a preliminary evaluation stage using signal strength and AGC measurements, and a detailed processing stage involving full demodulation and decoding. This segmentation allows the system to apply simpler, less complex operations to most channels while reserving complex processing only for channels that pass the preliminary filter, thereby reducing overall processing complexity while maintaining accurate signal detection.
Solution Approach 2:
The patent implements partial action by performing only partial processing (signal strength measurement and AGC analysis) on channels that are unlikely to contain valid signals, rather than applying full demodulation and decoding to all channels. This partial processing approach reduces processing complexity while maintaining sufficient accuracy for filtering out invalid channels, with full processing applied only where necessary.
Data Source
AI summary
A channel searching method may include setting a first channel in a broadcast signal, determining signal strength of the broadcast signal and generating an automatic gain control signal for the first channel, and when the signal strength satisfies a preset first requirement and the automatic gain control signal satisfies a preset second requirement, skipping demodulation of the first channel.