Camera Flash Synchronization via Acknowledgment Feedback
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Solution Overview
Problem
In photography systems, if the transmission of a command packet from the camera to the electronic flash device fails, the camera may perform photometric operations without the flash emission, leading to undesirable results.
Innovation Solution
The system includes a camera and an electronic flash device with communication units that exchange signals for preparatory flash emissions, where the camera starts photometric processing based on received flash emission timing information, and re-transmits signals if not acknowledged within a predetermined time, limiting re-transmissions to prevent unnecessary communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the camera transmits a command packet to the electronic flash device without confirmation, then the photography operation can proceed without delay, but communication failures cause desynchronization between flash emission and photometric operation
Solution Approach 1:
The electronic flash device transmits an acknowledgment packet back to the camera upon receiving the command packet, confirming successful reception. This feedback mechanism ensures the camera knows whether the flash device has received the preparatory flash emission command, preventing desynchronization and ensuring reliable operation.
2Reliability
If the camera waits for acknowledgment before proceeding, then synchronization reliability is improved, but photography operation speed decreases due to waiting time
Solution Approach 1:
The command packet includes preparatory information about the flash emission timing and characteristics in advance. The camera can prepare its photometric operation parameters based on this preliminary information, reducing the need for lengthy waiting and confirmation cycles while maintaining synchronization reliability.
3Reliability
If re-transmission is performed indefinitely upon failure, then communication reliability is improved, but unnecessary communication and energy consumption increase
Solution Approach 1:
The system performs re-transmission of the command packet a limited number of times (e.g., 2-3 times) upon not receiving an acknowledgment, rather than indefinitely. This partial re-transmission strategy balances communication reliability with energy conservation, avoiding excessive communication attempts that would waste energy and time.
Data Source
AI summary
A photography system includes: a camera containing a first communication unit; and a photography illumination device containing a second communication unit, wherein: the camera wirelessly transmits from the first communication unit to the second communication unit a first signal that commands, from the camera side to the photography illumination device side, a preparatory flash emission that precedes a main flash emission during photography; the photography illumination device wirelessly transmits from the second communication unit to the first communication unit a second signal that includes flash emission timing information of the preparatory flash emission, and that carries information, from the photography illumination device side to the camera side, as to the effect that the first signal has been received; and the camera starts photometric processing during the preparatory flash emission based upon the flash emission timing information.