Receiver AGC and Slicer Timing for Interference-Resistant 3D Signals
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Solution Overview
Problem
Active shutter glasses for 3D displays face challenges with varying signal strength due to distance from the transmitter, interference from environmental sources, and compatibility issues with different 3D display manufacturers, leading to inefficient automatic gain control and limited operational range.
Innovation Solution
A system with an AGC module and command processor that adjusts the receiver gain and slicer threshold only at the end of each command, using a peak detector and switched-capacitor integrator, allowing for multiple command formats and improved interference rejection, enabling operation across various 3D display types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous automatic gain control is used to maintain signal strength, then signal reception quality is improved, but voltage droop occurs and device complexity increases
Solution Approach 1:
The patent applies periodic action by updating the AGC gain only at specific intervals (e.g., at the end of each command transmission) rather than continuously. The command processor detects command endings and triggers gain updates accordingly, eliminating continuous voltage adjustment and preventing voltage droop while maintaining signal reception quality.
Solution Approach 2:
The patent uses preliminary action by pre-calculating and storing multiple gain values in advance. The AGC circuit selects from these pre-computed gain values based on signal conditions, avoiding complex real-time calculations and reducing circuit complexity while maintaining effective signal control.
2Adaptability or versatility
If the receiver gain is continuously adjusted to adapt to varying signal strength, then operational range is extended, but interference from environmental sources increases
Solution Approach 1:
The system updates gain values periodically at command boundaries rather than continuously, which reduces susceptibility to environmental interference. By synchronizing gain updates with command endings detected by the command processor, the system avoids adjusting gain during intermediate periods when environmental noise may be present.
Solution Approach 2:
The command processor provides feedback about command endings to the AGC circuit, enabling coordinated gain updates. This feedback mechanism ensures that gain adjustments occur only when signal conditions are stable and commands are complete, reducing the impact of environmental interference while maintaining adaptability.
3Speed
If fast response AGC is implemented to handle interactive applications, then response speed is improved, but voltage droop and stability issues occur
Solution Approach 1:
The patent implements periodic gain updates synchronized with command endings, providing fast response to signal changes without continuous adjustment. The command processor detects command boundaries and triggers gain updates at these discrete moments, achieving fast response for interactive applications while preventing voltage droop that occurs with continuous adjustment.
Solution Approach 2:
The AGC system dynamically adapts its response timing to match the command structure. Gain updates occur at optimal moments (command endings) rather than continuously, allowing fast response when needed while maintaining voltage stability. The system's dynamic behavior is synchronized with the external command signal characteristics.
Data Source
AI summary
A system is disclosed that may include an Automatic Gain Control (AGC) module configured to automatically adjust the gain of a receiver, which is configured to receive a signal. The signal includes a number of commands, which have a characteristic command length and a characteristic command interval. The command length may have a substantially shorter duration than the command interval. The system may also include a slicer configured to interface to a command processor. The system includes a command processor communicatively coupled with the AGC module and/or the slicer for providing a notification to the AGC module and/or the slicer associated with the ends of the commands. The AGC module is configured to adjust the gain of the receiver and the slicer threshold voltage is updated when the notification is received from the command processor.