Receiver AGC and Slicer Updates at Command Boundaries
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Solution Overview
Problem
Active shutter glasses for 3-D displays face challenges with varying signal strength due to distance from the transmitter, interference from environmental sources, and compatibility issues with different 3-D 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 3-D display types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous automatic gain control is used to maintain signal strength, then signal reception reliability is improved, but interference from environmental sources increases and operational range is limited
Solution Approach 1:
The patent applies periodic action by using discontinuous AGC updates synchronized with command intervals rather than continuous AGC adjustment. The receiver performs AGC updates only at specific periodic moments when commands are received, allowing the system to maintain signal strength reliability while avoiding continuous amplification of environmental interference. This periodic synchronization with command structure enables the receiver to remain dormant during idle periods, reducing interference pickup.
Solution Approach 2:
The patent implements preliminary action by performing AGC adjustment in advance at the beginning of each command interval based on previously detected signal levels. The receiver prepares the gain setting before the actual signal arrival, allowing optimal signal reception from the outset while avoiding the need for continuous gain adjustments that would amplify interference throughout the interval.
2Adaptability or versatility
If AGC is updated continuously to adapt to varying signal strength, then adaptability to different distances is improved, but processing speed and responsiveness deteriorate
Solution Approach 1:
The system uses periodic AGC updates synchronized with command reception intervals rather than continuous updates. This approach maintains adaptability to distance variations by refreshing gain settings with each new command, while preserving processing speed by eliminating unnecessary continuous adjustments. The periodic nature ensures the system adapts to varying signal strengths at optimal intervals without sacrificing responsiveness.
Solution Approach 2:
The receiver employs self-service by automatically detecting signal levels and adjusting its own gain settings at appropriate intervals without external control. This autonomous operation maintains adaptability to distance variations while preserving processing speed, as the system independently manages its own gain control without requiring continuous external intervention or complex control loops.
3Stability of the object's composition
If AGC time constant is increased to reduce voltage droop between commands, then signal stability is improved, but response time to signal changes increases
Solution Approach 1:
The patent resolves this contradiction by using periodic AGC updates synchronized with command intervals rather than relying on a continuously operating AGC circuit with a long time constant. The periodic refresh of gain settings at command boundaries maintains signal stability across command intervals while preserving fast response time to signal changes, as the AGC circuit can use a shorter time constant without causing voltage droop issues.
Solution Approach 2:
The system applies preliminary action by pre-adjusting the gain setting before each command interval based on previously detected signal levels. This advance preparation ensures signal stability is maintained throughout the interval without requiring a long time constant, while the system remains responsive to signal changes because the AGC circuit itself can operate with a shorter time constant.
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.