Asynchronous FIFO Memory for Jitter Removal in Camera Signal Processing
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Solution Overview
Problem
Camera systems with separated imaging units face challenges in maintaining signal stability due to jitter and skew components introduced by cable length and component unevenness, particularly when processing high-speed digital signals like DVI or SDI, which can lead to malfunctions and incorrect video outputs.
Innovation Solution
Incorporating an asynchronous FIFO memory between the serial-to-parallel conversion module and the signal processing unit to remove jitter and skew components before signal processing, and utilizing PLL modules with reset signals to stabilize clock frequencies and handle cable detachment or resolution changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed digital signals are transmitted through cables in separated camera systems, then signal transmission speed increases, but jitter and skew components are introduced causing signal instability
Solution Approach 1:
An asynchronous FIFO memory is introduced as an intermediary component between the serial-to-parallel conversion module and the signal processing unit. This FIFO buffer absorbs the jitter and skew components that occur during high-speed signal transmission through cables, allowing fast transmission while maintaining signal stability through the buffering mechanism.
2Adaptability or versatility
If cable length is increased to provide flexibility in system configuration, then adaptability improves, but jitter and skew components increase causing signal degradation
Solution Approach 1:
The asynchronous FIFO memory serves as a mediator that decouples the signal transmission quality from cable length variations. By buffering the high-speed digital signals, the FIFO allows flexible cable length selection for system configuration while maintaining consistent signal integrity regardless of transmission distance.
3Reliability
If asynchronous FIFO memory is added to remove jitter and skew, then signal stability improves, but device complexity increases
Solution Approach 1:
The patent employs a relatively simple and cost-effective asynchronous FIFO memory structure rather than complex jitter reduction circuits or high-precision clock synchronization systems. This disposable-like approach uses a straightforward buffer mechanism that provides effective jitter and skew removal without requiring elaborate design, keeping the added complexity minimal while achieving the desired signal stability.
4Reliability
If PLL modules with reset signals are used to stabilize clock frequencies, then signal processing reliability improves, but device complexity increases
Solution Approach 1:
Reset signals are generated in advance based on the lock status of PLL modules to proactively clear the FIFO memory when clock frequency instability is detected. This preliminary action prevents signal processing errors before they occur, improving reliability by anticipating and preventing problems rather than reacting to them after they manifest.
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
This approach ensures stable digital signal output by reducing jitter and skew, maintaining signal integrity across varying distances and component configurations, and prevents malfunctions associated with cable detachment or resolution changes, allowing for reliable DVI or SDI signal generation without high-capacity memory.
Implementation Method 1
Incluring an asynchronous FIFO memory between the serial-to-parallel conversion module and the signal processing unit to remove jitter and skew components before signal processing
Implementation Method 2
Incluring an asynchronous FIFO memory between the serial-to-parallel conversion module and the signal processing unit to remove jitter and skew components before signal processing
Implementation Method 3
utilizing PLL modules with reset signals to stabilize clock frequencies and handle cable detachment or resolution changes
Data Source
AI summary
According to one embodiment, a camera apparatus includes, an imaging unit which acquires videos, a cable which connects the imaging unit to a control unit, and the control unit which comprises an asynchronous FIFO memory and a signal processing module and controls the imaging unit, the control unit performing transmitting to the imaging unit a drive signal configured to control an image sensor included in the imaging unit, and receiving a video signal including a clock signal or a synchronous signal output from the image sensor and converting this signal into a video signal standardized via the signal processing module.