RF Strobe Synchronization for 3D Glasses Over Noisy Channels
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Solution Overview
Problem
Electronic devices communicating over radio frequency links face synchronization issues, particularly in systems like 3D television and glasses, where minor timing differences can cause user discomfort such as headaches or sore eyes due to unsynchronized shutter lens control and image display.
Innovation Solution
A method for synchronizing a remote device with a primary device using a radio frequency link, involving selective broadcasting of data on multiple channels with fixed time frame offsets relative to a strobe signal, noise level threshold checks, and cyclic synchronization of the remote device's strobe signal with the primary device's signal to ensure accurate timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is broadcast over RF link between primary device and remote device, then communication between devices is enabled, but synchronization timing accuracy deteriorates causing user discomfort
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying timing offset compensation values before the actual synchronized display operation. The system determines the timing offset between primary and remote devices in advance, then uses this compensation value to adjust the remote device's timing proactively, preventing synchronization errors before they cause user discomfort.
Solution Approach 2:
The patent implements feedback by continuously monitoring the synchronization status between primary and remote devices. The system measures actual timing differences, calculates compensation values based on this feedback, and adjusts the remote device's timing accordingly. This closed-loop feedback mechanism ensures synchronization accuracy is maintained despite RF link variations.
2Reliability
If fixed time frame offset is applied to multiple channels, then channel interference is reduced, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the RF communication into multiple channels, each with its own fixed time frame offset. This segments the data transmission in time, allowing multiple channels to operate simultaneously without interfering with each other. Each channel is independently timed, which reduces interference while the overall system manages complexity through standardized offset assignment.
Data Source
AI summary
A method for synchronizing a function on a remote device with a function on a primary device includes selectively broadcasting, from a radio frequency (RF) transmitter of the primary device, data broadcast on channels at different times relative to a fixed period strobe signal of the primary device. Only the channels that have a noise level below a specified threshold level selectively broadcast the data and each of the channels have an associated fixed time frame offset relative to the fixed period strobe signal. Each of the channels is broadcast after their associated fixed time frame offset expires. An RF receiver of the remote device receives the data on one of the channels. The data on each of the channels is received at different times, depending on its associated fixed time frame offset, which results in the data on each received channel having an associated received time reference relative to a strobe signal of the remote device. The remote device strobe signal is synchronized to determine a received time reference and the fixed time frame offset. The remote device function is cyclically performed, which results in the remote device function being synchronized with the primary device function. The method may be used to synchronize a 3D video signal broadcast from a transmitter to sets of 3D glasses.