Oscilloscope 3D Mapping in Scan Mode Using FIFO Flag Updates
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Solution Overview
Problem
Traditional digital storage oscilloscopes in scan mode struggle to acquire multiple frames of waveform data within a single screen refresh cycle at slow time-bases, preventing three-dimensional mapping and fluorescent waveform display.
Innovation Solution
A method is introduced to increase the sampling rate and implement three-dimensional compression mapping, using a flag to update data in a FIFO memory and video memory, allowing for real-time data acquisition and display of waveforms scrolling from right to left, enabling 3D mapping in scan mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the oscilloscope operates in scan mode at slow time-base, then the screen refresh cycle is maintained, but the time to acquire a complete frame of waveform exceeds the screen refresh cycle, preventing three-dimensional mapping
Solution Approach 1:
The patent divides the waveform acquisition process into multiple segments that can be accumulated across different screen refresh cycles. Instead of requiring one complete waveform frame per refresh cycle, the system segments the acquisition into multiple partial frames that are stored and combined, allowing the screen to refresh at normal speed while accumulating sufficient data for three-dimensional mapping over time.
Solution Approach 2:
The patent implements preliminary action by pre-acquiring and storing multiple frames of waveform data in memory before the screen refresh occurs. This allows the system to have multiple complete waveform frames ready for three-dimensional mapping computation, ensuring that the slow acquisition time does not prevent the screen from refreshing at its normal cycle rate.
2Reliability
If multiple frames of waveform are acquired for three-dimensional mapping, then fluorescent waveform display is enabled, but the acquisition time for each frame increases at slow time-base
Solution Approach 1:
The patent maintains continuity of useful action by continuously acquiring waveform data in the background during the screen refresh cycle. Multiple waveform frames are accumulated continuously in memory without interruption, ensuring that when three-dimensional mapping is performed, complete and continuous waveform data is available, eliminating the time loss that would occur from restarting acquisition.
Solution Approach 2:
The system performs preliminary acquisition of multiple waveform frames before the three-dimensional mapping computation is needed. This preliminary action ensures that all required data is ready in advance, allowing the mapping operation to proceed without time delays and maintaining reliable fluorescent waveform display.
3Device complexity
If traditional scan mode is used, then simple waveform display is achieved, but fluorescent waveform display through three-dimensional mapping cannot be realized
Solution Approach 1:
The patent implements multi-functionality by creating a display system that can operate in both traditional scan mode and three-dimensional mapping mode. The same hardware and data acquisition infrastructure support both simple waveform display and fluorescent waveform display with probability statistics, allowing the oscilloscope to adapt between different display modes based on the situation without requiring separate systems.
Solution Approach 2:
The patent segments the display processing into separate modules: one for traditional scan mode display and another for three-dimensional mapping. This segmentation allows each module to be optimized independently while sharing common data resources, reducing the overall complexity burden and enabling flexible switching between display modes.
Data Source
AI summary
A method for oscilloscope 3D mapping in scan mode. The input signal is acquired using a real-time sampling rate which is Dr times higher, thus more sampling points, i.e. Dr acquired data can be obtained during the time interval between two consecutive horizontal pixels. The Dr acquired data are mapped into a same column of the screen to implement fluorescent waveform display. In addition, to realize the scanning display, a flag X is introduced into the three-dimensional database, when the screen refresh signal arrives, the first Ds acquired data are read out from the unread acquired data in FIFO memory. The three-dimensional database is updated from the flag X, which make the leftmost waveform always be the oldest waveform, the rightmost waveform always be the newest waveform. Thus the 3D mapping is realized in scan mode, letting the DSO have a fluorescent waveform display at slow time-base.