Tuner Blind Scanning with Adaptive Center Frequency Detection
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Solution Overview
Problem
In wired communication systems, echo cancelers require large hardware volumes due to the small echo power at tap positions, necessitating a reduction in hardware while maintaining effective echo processing.
Innovation Solution
A blind scan method that adjusts a tuner's center frequency based on rise and drop points within spectrum blocks to determine the presence of valid signals, allowing for efficient echo processing without excessive hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger echo canceler is used to improve echo processing effect, then echo processing capability is improved, but hardware volume increases
Solution Approach 1:
The patent extracts only the necessary echo tap positions (those with significant echo power) from the complete set of tap positions. By identifying and processing only the dominant echo paths rather than all possible taps, the system achieves effective echo cancellation with fewer hardware resources, directly resolving the contradiction between processing capability and hardware volume.
Solution Approach 2:
The patent applies different processing quality to different tap positions based on their echo power characteristics. Instead of uniformly processing all taps with the same hardware resources, it concentrates computational resources on tap positions with significant echo power while ignoring or simplifying processing of taps with negligible echo power, thereby optimizing the balance between capability and volume.
2Reliability
If all tap positions are processed to ensure complete echo cancellation, then echo processing completeness is improved, but hardware complexity increases
Solution Approach 1:
The patent extracts and processes only the subset of tap positions that contribute significantly to echo power. By mathematically identifying dominant echo paths and selectively processing only those, the system achieves complete echo cancellation for the significant components without the hardware complexity of processing all possible tap positions.
Solution Approach 2:
The patent applies partial action by processing only the necessary portion of tap positions (those with significant echo power) rather than all taps. This selective approach achieves sufficient echo cancellation completeness for practical purposes while avoiding the excessive hardware complexity that would result from processing every possible tap position with equal detail.
Data Source
AI summary
A blind scan method includes setting a tuner to scan a first spectrum block with a first center frequency as a center and determining whether the first spectrum block comprises a possible signal; adjusting the tuner to scan a second spectrum block with a second center frequency as the center according to a first rise point and a first drop point when it is determined that the first spectrum block comprises the possible signal; and determining whether the second spectrum block comprises a valid signal.