Video Recording Apparatus Free Run Mode Time Code Error Reduction
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Solution Overview
Problem
The auto-power-off function in video recording devices causes significant clocking errors when power is turned off, leading to deviations in time codes, which disrupt the synchronization of video images captured by multiple devices during editing.
Innovation Solution
A video recording apparatus with a setting unit that allows selection of a 'free run mode' for time code counting, where power is not turned off even when no user operation is detected within a predetermined period, and a control unit that manages auto-power-off based on this setting to prevent clocking errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If auto-power-off function is activated to save battery, then battery consumption is reduced, but time code accuracy deteriorates due to clocking errors when power is turned off
Solution Approach 1:
The system dynamically adjusts the auto-power-off behavior based on the time code counting mode. When free run mode is detected, the system disables auto-power-off to maintain continuous time code generation. When other modes are active, auto-power-off remains enabled to conserve battery. This dynamic adaptation resolves the contradiction by making the power management strategy contingent on the operational requirements.
Solution Approach 2:
The system changes the operational parameter of the power management function based on the time code mode. By detecting whether free run mode is set, the system alters the power-off threshold parameter - either disabling it entirely (free run mode) or maintaining normal operation (other modes). This parameter change allows the system to optimize for either time code accuracy or battery conservation depending on the active mode.
2Loss of energy
If power is turned off during free run mode, then battery is conserved, but time code synchronization deteriorates across multiple devices
Solution Approach 1:
The system dynamically responds to mode changes by adjusting power management behavior. When free run mode is detected, the system automatically disables auto-power-off to ensure continuous time code generation and maintain synchronization across multiple devices. This dynamic adjustment ensures that the reliability of time code synchronization is preserved when continuous operation is required.
Solution Approach 2:
The system performs preliminary detection of the time code mode before executing power management decisions. By checking whether free run mode is set beforehand, the system proactively prevents power-off actions that would compromise time code synchronization. This preliminary action ensures that the correct power management strategy is applied before the actual power state change occurs.
3Duration of action of moving object
If auto-power-off is enabled to extend battery life, then drive time is extended, but clocking error increases when power cycles occur
Solution Approach 1:
The system changes the power management parameter based on the detected mode. When free run mode is active, the system sets the auto-power-off threshold to infinity (effectively disabling it) to prevent power cycling and maintain continuous clock operation. This parameter change eliminates clocking errors while the system is in free run mode, addressing the precision issue without permanently sacrificing battery life extension capabilities.
Data Source
AI summary
A video recording apparatus that is capable of reducing generation of error in a time code due to an auto-power-off function. A setting unit sets a count method by which a time code given to a video image is counted by selecting from among a plurality of count methods including a free run mode in which the time code is counted regardless of whether a video image is recording. A control unit controls so as to perform auto power off to turn off power when a predetermined condition, which includes a condition where there is no user's operation within a predetermined period, is satisfied in a mode other than the free run mode. The control unit controls so as not to turn off the power even when the predetermined condition is satisfied in the free run mode.