Ranging Device Pulse Count Ranking for Storage Accuracy
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Solution Overview
Problem
Existing ranging devices face accuracy issues due to inappropriate reference level comparisons, leading to reduced storage capacity and degraded ranging accuracy when the relationship between incident light and reference levels is not optimal.
Innovation Solution
A ranging device incorporating a time counting circuit, pulse generation circuit, first and second holding circuits, and a comparison circuit to count and rank pulse values over multiple count periods, allowing for efficient storage and comparison of identification information to maintain accuracy without excessive storage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the storage capacity of the storage circuit is reduced by not storing digital signals when incident light intensity exceeds the reference level, then the storage capacity is reduced, but the ranging accuracy may be degraded due to insufficient stored data
Solution Approach 1:
The patent divides the storage strategy into selective storage based on light intensity thresholds. The storage circuit stores digital signals only when incident light intensity is at or below the reference level, segmenting the storage operation into conditional branches that reduce overall storage requirements while maintaining necessary data for ranging accuracy.
Solution Approach 2:
The patent changes the parameter of light intensity threshold comparison to control storage behavior. By using the reference level as a threshold parameter, the system dynamically determines whether to store based on the relationship between incident light intensity and this parameter, optimizing the balance between storage capacity and ranging accuracy.
2Quantity of substance
If the reference level comparison method is used to determine signal storage, then the storage capacity is reduced, but the accuracy of distance measurement decreases when the relationship between incident light and reference level is not appropriate
Solution Approach 1:
The patent implements feedback by continuously monitoring the relationship between incident light intensity and the reference level, and adjusting storage decisions accordingly. The comparison circuit provides feedback signals to the storage circuit based on the light intensity comparison, enabling dynamic control that maintains ranging accuracy while optimizing storage capacity.
Solution Approach 2:
The patent introduces dynamic control of the storage circuit based on real-time light intensity conditions. The system transitions from static storage to dynamic conditional storage, where the storage behavior adapts to the current lighting conditions, allowing the system to maintain optimal performance across varying environmental conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reduced storage capacity while maintaining ranging accuracy by effectively ranking and updating pulse count values, thereby improving the device's ability to accurately measure distances even with limited memory resources.
Implementation Method 1
a pulse generation circuit that generates a signal including a pulse based on light including reflected light from an object
Implementation Method 2
measures a distance to an object based on a time difference between a light projecting timing and a light receiving timing
Data Source
AI summary
A ranging device includes a time counting circuit, a pulse generation circuit, first and second holding circuits, and a comparison circuit. The pulse generation circuit generates a signal including a pulse based on light. The first holding circuit sequentially performs an operation of holding a pulse count value based on the number of pulses in a count period. The second holding circuit holds N sets of identification information indicating one of count periods and a pulse count value corresponding to the identification information. The comparison circuit compares the pulse count value held in the first holding circuit with the N pulse count values held in the second holding circuit and performs an update process of holding, in the second holding circuit, identification information that specifies each of count periods whose rank of pulse count value is up to the N-th, and a pulse count value corresponding to the identification information.