Video Signal Processing Device Using Multiband Analysis
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Solution Overview
Problem
Conventional video signal processing devices face challenges in optimally executing noise reduction, enhancement, and smoothing due to independently functioning circuits, which results in suboptimal performance and larger circuit sizes.
Innovation Solution
A video signal processing device and method that utilizes an N line buffer to delay input video data, followed by multiband signal generators and analyzers to analyze characteristics and adjust frequency bands and amplitudes, allowing for selective execution of noise reduction, enhancement, and smoothing based on video signal characteristics while reducing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent signal processing circuits (noise reduction, enhancement, smoothing) are provided, then each circuit can perform its specific function, but the circuit size becomes large and it is difficult to optimally process video signals according to their characteristics
Solution Approach 1:
The patent implements a universal signal processing circuit that can perform multiple functions (noise reduction, enhancement, smoothing) through a single integrated architecture. The circuit uses frequency band division and correlation-based analysis to adaptively execute different processing modes based on video signal characteristics, eliminating the need for multiple independent circuits and thereby reducing overall circuit size while maintaining full functional capability.
Solution Approach 2:
The patent employs dynamic adaptation mechanisms where the signal processing circuit adjusts its operation based on real-time analysis of video signal characteristics. The correlation detector and frequency band dividers enable the circuit to dynamically switch between noise reduction, enhancement, and smoothing modes, allowing optimal processing tailored to each video signal's specific properties rather than using fixed independent circuits.
2Object-affected harmful factors
If a noise reduction circuit is placed in the input stage of an enhancement circuit, then noise is reduced, but the useful signal components are also attenuated making enhancement ineffective
Solution Approach 1:
The patent segments the video signal into multiple frequency bands using frequency band dividers before processing. By dividing the signal spectrum into distinct bands, the system can apply different processing strategies to different frequency ranges, preserving useful high-frequency components while reducing noise in appropriate bands, thus avoiding the signal attenuation problem of conventional noise reduction circuits.
Solution Approach 2:
The patent applies different processing characteristics to different frequency bands based on local signal properties. The correlation detector analyzes specific regions in different frequency bands and applies targeted processing only where needed, rather than uniformly attenuating all frequencies. This localized approach preserves useful signal components while effectively reducing noise in specific frequency regions.
Data Source
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AI summary
A multiband signal generator generates multiband signals from 21 lines of input data by using a subset of N lines with each line delayed from 1 line to N lines respectively. M line buffers delay the multiband signals such that each line is delayed from 1 line to M lines respectively. An analyzer detects correlations between video data by selecting regions with a maximum size M x M in the multiband signals, and analyzes characteristics of the video data. Amultiband signal generator generates multiband signals with cutoff frequencies based on an analysis result from the analyzer, by using the data from 1-line through N-line delayed multiband signal. An amplitude adjuster and synthesizer unit adjusts and synthesizes amplitudes of the multiband signals.