Event-Based Video Synchronization via Circular Buffer

The patent divides the video stream into discrete image components and organizes them into a circular file structure. This segmentation allows the host device to read and process images asynchronously at its own pace without requiring the peripheral to maintain a continuous high-speed stream, effectively matching the USB transfer rate to the actual display needs.

The patent implements a look-ahead buffer that pre-loads image components into memory before they are needed for display. This preliminary action ensures that when the host device is ready to display the next image, the data is already available in buffer, eliminating waiting time and ensuring smooth playback without requiring sustained high transfer rates.

The patent implements event-based synchronization where the host device autonomously monitors its own display timing and generates read requests accordingly. The peripheral system simply responds to these requests by providing the next image component from the circular file. This self-service approach eliminates the need for expensive clock-synchronization hardware while maintaining perfect sync between transfer and display events.

The circular file structure acts as an intermediary mechanism that decouples the peripheral and host timing. Instead of requiring both devices to synchronize to a common clock, the circular file serves as a buffer that the host can read from at its own pace while the peripheral writes to it independently, with the file structure itself ensuring proper sequencing without active synchronization.