Peak Suppression Filter Weighting for Long-Duration Signal Peaks
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Solution Overview
Problem
Existing peak suppressing circuits fail to optimally suppress peaks without causing either insufficient or excessive suppression, particularly when input signals exceeding a threshold continue for a long period, due to convolution influences from a wide range of taps in band limiting filters.
Innovation Solution
A peak suppressing device and method that includes a weight coefficient generating unit which performs convolution arithmetic operations using tap coefficients of the band limiting filter to calculate and adjust for convolution influences, thereby reducing excessive peak suppression by generating adaptive weight coefficients for the peak signals processed by the band limiting filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of taps of the band limiting filter is increased to process broader bands and faster signal speeds, then the frequency band coverage and signal processing capability are improved, but the convolution influence from a wide range of taps causes excessive peak suppression
Solution Approach 1:
The patent segments the tap coefficients of the band limiting filter into multiple groups, with each group assigned to a specific peak detection point. This segmentation allows independent weight coefficient calculation for each group, preventing the convolution influence from propagating across the entire wide range of taps. The segmentation resolves the contradiction by localizing the convolution effect within each group rather than allowing it to affect the entire signal bandwidth.
Solution Approach 2:
The patent applies local quality by calculating weight coefficients specifically for each tap coefficient group based on the convolution influence at that local position. Instead of using a uniform weight coefficient across all taps, the system adapts the weight coefficient to the local characteristics of each group, thereby maintaining peak suppression accuracy even when the total number of taps is increased for broader band coverage.
2Ease of operation
If fixed weight coefficients are used to reduce convolution influence from neighboring taps, then implementation simplicity is maintained, but excessive peak suppression cannot be prevented when broad bands and many taps are used
Solution Approach 1:
The patent transitions from static fixed weight coefficients to dynamic weight coefficients that are calculated based on the actual convolution influence at each peak detection point. The weight coefficient becomes a variable that adapts to the local signal conditions and filter characteristics, improving peak suppression effectiveness while maintaining reasonable implementation complexity through the systematic calculation approach.
Solution Approach 2:
The patent changes the parameter of weight coefficient from a fixed constant to a calculated value that varies according to the tap coefficient group and peak detection point. This parameter change allows the system to adapt to different signal conditions and filter configurations, resolving the contradiction between implementation simplicity and peak suppression effectiveness.
Data Source
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AI summary
It is an object of the present invention to provide a peak suppressing device and a peak suppressing method which optimally suppress peaks without causing insufficient suppression or excessive suppression even when input signals exceeding a threshold continue for a long period of time. A peak suppressing device (10) according to the present invention includes: a subtracting unit (11) that subtracts a predetermined threshold from an amplitude value of an input signal and generates a first peak signal; a multiplying unit (12) that multiplies the first peak signal by a weight coefficient and generates a second peak signal; a band limiting filter (13) that limits a band of the second peak signal by using a filter including a plurality of tap coefficients, and generates a third peak signal; a subtracting unit (14) that subtracts the third peak signal from the input signal; and a weight coefficient generating unit (15) that generates the weight coefficient based on a value, the value being an amplitude value of the first peak signal divided by an amplitude value of a fourth peak signal generated when a convolution arithmetic operation is performed on by using at least a tap coefficient used in a center tap of the band limiting filter (13) and tap coefficients used as taps before and after the center tap.