Wireless Reception Device Frame Synchronization Control
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Solution Overview
Problem
Wireless communication between transmission and reception devices is prone to disturbances, leading to potential frame missing and increased display delays due to frequency and phase differences, which existing solutions like PLL circuits address at a higher cost or with inadequate synchronization processing.
Innovation Solution
A reception device that receives image information via wireless communication, generates and updates display time information, and controls the frame update cycle to approximate the transmission interval, using generation time information and processing time information to minimize delays and frame loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no synchronization processing is performed when wirelessly connected, then device complexity is reduced, but frequency and phase differences cause missing frames and display delay
Solution Approach 1:
The reception device calculates the second interval based on display time information and feeds this back to adjust the frame update cycle. This feedback mechanism allows the system to automatically compensate for frequency and phase differences caused by wireless disturbances, maintaining synchronization without complex hardware circuits.
Solution Approach 2:
The system dynamically changes the frame update cycle parameter by calculating a second interval that approximates the first transmission interval. By adjusting this temporal parameter based on received time information, the system adapts to wireless channel variations and maintains reliable frame transmission.
2Reliability
If PLL circuit is used to remove disturbance influence, then frame transmission reliability is improved, but device cost increases
Solution Approach 1:
The patent replaces the mechanical/electronic PLL circuit with a software-based synchronization method. The control unit calculates intervals and adjusts update cycles using computational algorithms, substituting complex hardware circuitry with simpler software processing that achieves the same synchronization function.
Solution Approach 2:
Instead of using an expensive PLL circuit, the system employs simple time information tracking and interval calculation methods that can be implemented with basic hardware and software, significantly reducing device cost while maintaining reliability.
3Device complexity
If simple synchronization processing is used for wired connection, then device complexity is reduced, but disturbance in wireless path causes frequency and phase differences
Solution Approach 1:
The transmission device transmits time information (generation time, display time) preliminarily with the image data. This preliminary action allows the reception device to pre-calculate intervals and prepare synchronization adjustments before actual frame display, compensating for potential wireless disturbances.
Solution Approach 2:
The system uses received time information to calculate a second interval and feeds this back to adjust the frame update cycle. This feedback loop enables the system to compensate for wireless disturbances by continuously adapting to actual transmission conditions.
Data Source
AI summary
To reduce the possibility of occurrence of problems such as missing frames and an increase in display delay even if a disturbance occurs in a communication path. A reception device includes a reception unit that sequentially receives image information transmitted by a transmission device at a given first interval by wireless communication, a display unit that sequentially displays frame images on the basis of the image information in accordance with a display clock and generates display time information indicating a time corresponding to the update time of the frame image, and a control unit that calculates a second interval indicating an interval at which the frame images are displayed on the basis of plural pieces of the display time information and controls the update cycle of the frame image in accordance with the display clock such that the second interval approximates to the first interval.