Receiving Apparatus Pulse Noise Removal Threshold Control
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Solution Overview
Problem
Existing receiving apparatuses struggle to accurately remove pulse noise due to the extension of pulse noise in time and reduction of instantaneous amplitude after passing the bandwidth limiting filter, affecting the noise blanker's ability to detect and remove pulse noise with high accuracy.
Innovation Solution
Incorporating a first pulse noise determining unit, a first pulse noise removing unit, a bandwidth limiting filter, a second pulse noise determining unit, and a threshold controller to adjust the threshold based on the detection of remaining pulse noise after the bandwidth limiting filter, enhancing the detection sensitivity and accuracy of pulse noise removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the noise blanker is placed after the bandwidth limiting filter to detect and remove pulse noise, then the non-target signal is removed before noise detection, but the pulse noise is extended in time and its instantaneous amplitude is reduced, making detection inaccurate
Solution Approach 1:
The patent divides the pulse noise removal process into two separate stages: first removing pulse noise before the bandwidth limiting filter, then removing remaining pulse noise after the filter. This segmentation allows each stage to operate optimally - the first stage handles strong pulse noise when the signal bandwidth is wide, while the second stage handles residual noise after bandwidth limitation, resolving the contradiction between noise removal effectiveness and detection accuracy
Solution Approach 2:
The patent performs preliminary pulse noise removal before the bandwidth limiting filter is applied. By removing pulse noise in advance when the signal still has wide bandwidth and higher instantaneous amplitude, the system avoids the detection accuracy problems that would occur if noise removal were performed after bandwidth limitation, when pulse noise characteristics have deteriorated
2Measurement precision
If the first threshold is set low to detect weak pulse noise, then detection sensitivity increases, but false detection of transmission signals increases; if set high, false detection decreases but pulse noise detection sensitivity reduces
Solution Approach 1:
The patent segments the threshold-based detection into two distinct thresholds: a first threshold for initial pulse noise detection before bandwidth limiting, and a second threshold for detecting remaining pulse noise after bandwidth limiting. This allows each threshold to be optimized for its specific stage - the first threshold can be more sensitive since strong pulse noise is present, while the second threshold can be adjusted to avoid false detection of transmission signals
Solution Approach 2:
The patent dynamically adjusts the first threshold based on the output characteristics of the bandwidth limiting filter. By making the threshold adaptive rather than fixed, the system can maintain high detection sensitivity for actual pulse noise while avoiding false detection of transmission signals, resolving the contradiction between sensitivity and reliability
Data Source
AI summary
A receiving apparatus includes: a first pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal based on a first threshold; a first pulse noise removing circuit configured to remove pulse noise in the receiving signal based on the result of the determination made by the first pulse noise determining circuit; a bandwidth limiting filter configured to limit a receiving signal whose pulse noise has been removed by the first pulse noise removing circuit to a predetermined bandwidth; a second pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal whose bandwidth has been limited by the bandwidth limiting filter based on a second threshold; and a threshold control circuit configured to adjust a first threshold based on the result of the determination made by the second pulse noise determining circuit.