Interval Recording Apparatus Dynamic Writing Unit Selection
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Solution Overview
Problem
Conventional recording apparatuses waste recording space on memory cards when recording moving image data obtained through interval shooting, as the data size is often smaller than the allocation unit, leading to unused areas in the allocation units.
Innovation Solution
A recording apparatus and method that selectively use either a first writing mode for smaller units or a second writing mode for larger units, switching to the first writing mode in interval recording to efficiently utilize the recording medium by writing moving image data in cluster units, thereby minimizing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If moving image data is written in AU units during interval shooting, then writing speed is improved, but recording space is wasted due to unused areas in AU when data size is smaller than AU
Solution Approach 1:
The system dynamically switches between AU unit writing and RU unit writing based on the recording mode. During interval shooting, it uses RU unit writing to minimize space waste, while during normal shooting, it uses AU unit writing to maximize writing speed. This dynamic adaptation resolves the contradiction by selecting the appropriate writing unit according to operational context.
Solution Approach 2:
The invention changes the writing unit parameter from AU to RU when operating in interval recording mode. This parameter change allows the system to write smaller data pieces efficiently without leaving unused areas, thereby resolving the space waste issue while maintaining acceptable writing performance for interval shooting applications.
2Loss of substance
If moving image data is written in RU units during interval shooting, then recording space utilization is improved, but writing speed deteriorates
Solution Approach 1:
The system dynamically adapts the writing unit based on the recording mode. For interval shooting with typically smaller data sizes, it selects RU unit writing to optimize space utilization. For normal continuous shooting with larger data sizes, it switches to AU unit writing to maximize writing speed. This dynamic selection resolves the contradiction by matching the writing method to the specific operational requirements.
Solution Approach 2:
The invention changes the writing unit parameter dynamically based on recording mode. When interval recording is detected, the system switches from AU to RU writing units, optimizing space utilization for the specific use case. This parameter adaptation allows the system to achieve optimal performance for each recording scenario.
3Device complexity
If a fixed writing mode is used for all recording scenarios, then device complexity is reduced, but recording efficiency deteriorates due to inability to adapt to different data sizes
Solution Approach 1:
The system implements dynamic writing mode selection based on recording mode detection. The control unit automatically determines whether to use AU or RU unit writing based on the current recording operation (interval shooting vs. normal shooting). This dynamic adaptation improves recording efficiency without requiring complex manual intervention, resolving the contradiction between simplicity and efficiency.
Solution Approach 2:
The control unit incorporates feedback from the recording mode detection to automatically select the appropriate writing unit. By monitoring whether the current operation is interval shooting or normal shooting, the system adjusts the writing parameters accordingly. This feedback mechanism enables efficient adaptation while maintaining relatively simple control logic.
Data Source
AI summary
There is a first writing mode in which data is written to a recording medium in a first recording unit, and a second writing mode in which data is written in a second recording unit whose size is greater than the first recording unit. In an interval recording mode in which a predetermined recording time worth of moving image data is repeatedly recorded each time a predetermined interval period elapses, moving image data is recorded to the recording medium in the first writing mode having the smaller recording unit. This makes it possible to effectively use the recording area of the recording medium in the case where moving image data obtained by interval shooting is recorded to the recording medium.