CVBS Formality Standard Detection Using PN Sequence Correlation
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Solution Overview
Problem
Existing systems for identifying the formality standard of Composite Video Broadcast Signals (CVBS) are resource-intensive and inconvenient, as they require manual changes in system configuration when switching between different standards, and current methods such as designing specific PN sequences or wavelet processing are inefficient.
Innovation Solution
A system that synchronizes a signal with a set of equidistant PN sequences and determines the formality standard based on the distance between successive PN sequences, using correlation values to identify the correct standard, thereby automating the process and reducing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual system configuration changes are implemented when switching between formality standards, then the system can adapt to different standards, but the ease of operation deteriorates due to manual intervention requirements
Solution Approach 1:
The system automatically detects the formality standard of the input video signal and switches configurations without user intervention. The detection module identifies NTSC, PAL, or SECAM standards, and the control module automatically adjusts system parameters, making the system self-configuring and eliminating manual operation requirements.
Solution Approach 2:
The system pre-stores multiple system configurations corresponding to different formality standards in memory. When a standard is detected, the control module quickly retrieves and applies the pre-prepared configuration, enabling rapid adaptation without manual setup or complex real-time calculations.
2Measurement precision
If specific PN sequences are designed for each formality standard, then measurement precision improves, but device complexity increases due to multiple sequence designs
Solution Approach 1:
A single universal PN sequence is designed to work across all three formality standards (NTSC, PAL, SECAM). The detection module uses this one sequence to detect synchronization signals in any standard, eliminating the need to design and maintain multiple different PN sequences while maintaining detection accuracy.
Solution Approach 2:
The system detects formality standards by measuring the distance between synchronization signal positions rather than by matching specific PN sequences. This parameter-based detection approach (measuring temporal distance) simplifies the system while maintaining precision, as it relies on a fundamental property that differs between standards rather than complex sequence matching.
3Measurement precision
If wavelet processing is used for formality standard identification, then measurement precision improves, but use of energy increases due to computational intensity
Solution Approach 1:
The system extracts only the essential synchronization signal from the video input and measures its position to determine the formality standard. This extraction approach avoids the heavy computational requirements of wavelet processing while maintaining detection accuracy, as it focuses only on the critical timing information needed for standard identification.
Solution Approach 2:
The patent replaces complex computational methods (wavelet processing) with a simpler measurement-based approach. Instead of performing intensive mathematical transformations, the system directly measures the distance between synchronization signals, substituting mechanical/timing measurement for computational analysis and reducing energy consumption.
4Ease of operation
If automated formality standard identification is implemented, then ease of operation improves, but device complexity increases due to detection mechanisms
Solution Approach 1:
The system uses a standardized synchronization signal as an intermediary carrier to convey formality standard information. Rather than requiring complex direct analysis of the entire video signal, the detection module simply needs to detect the position of this intermediary synchronization signal, simplifying the detection mechanism while enabling automated operation.
Data Source
AI summary
The present disclosure relates to a system and method. The system includes: a storage device storing a set of instructions; and one or more processors in communication with the storage device. When executing the set of instructions, the one or more video processors: synchronize a signal with a first PN sequence, wherein the signal includes a plurality of second PN sequences, marked as 0 PN sequence, 1 PN sequence, . . . , (k−1) PN sequence, k sequence, wherein k is a positive integer number; determine that the signal is synchronized with the first PN sequence; determine a first target distance between the (k−1) PN sequence and the k sequence; and determine a formality standard of the signal based on the first target distance.