Video Recording Apparatus Pre-Event Circulation Recording HDD
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Solution Overview
Problem
Existing video recording technologies are inefficient in utilizing storage space, as they do not effectively manage pre-event video recording without buffers, limiting memory capacity and leading to incomplete storage of videos before significant events.
Innovation Solution
A video recording apparatus with a pre-event circulation recording function that directly records pre-event videos on a nonvolatile storage medium like a hard disk drive, using a circulation recording method without buffers, and allocates separate storage regions for pre-event and post-event videos, with adjustable storage space based on video quality and resolution, and includes a spare region to maintain the set storage period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pre-event videos are recorded using a buffer, then recording speed is improved, but storage space efficiency deteriorates and memory capacity is limited
Solution Approach 1:
The patent extracts the buffer component from the recording system and replaces it with direct writing to nonvolatile storage medium. The circulation recording method operates directly on the storage medium without requiring a buffer, thereby eliminating the storage space limitation imposed by buffers while maintaining continuous recording capability.
Solution Approach 2:
The storage medium is segmented into circulation recording regions where pre-event videos are stored in a circular buffer manner directly on the nonvolatile storage. This segmentation allows efficient space utilization by overwriting old pre-event recordings when the region is full, achieving both speed and storage efficiency.
2Reliability
If storage space is allocated for pre-event videos, then completeness of pre-event recording is improved, but storage space for post-event videos is reduced
Solution Approach 1:
The storage medium is divided into distinct circulation recording regions for pre-event videos and separate regions for post-event videos. This segmentation ensures that pre-event recording completeness is maintained through dedicated circulation regions while post-event videos have sufficient allocated space, resolving the storage space allocation conflict.
Solution Approach 2:
The circulation recording method automatically discards old pre-event video data when the circulation region is full and recovers the storage space for new pre-event recordings. This dynamic space management ensures pre-event recording completeness while freeing up space that can be allocated to post-event video storage.
3Device complexity
If fixed storage space is allocated for pre-event videos, then storage management is simplified, but adaptability to different video qualities is reduced
Solution Approach 1:
The circulation recording regions are designed with dynamic space allocation capabilities. The storage space for pre-event videos can be dynamically adjusted based on video quality, resolution, and recording duration requirements. This dynamic approach maintains simple management through automated circulation while adapting to different video parameters.
Solution Approach 2:
The system allows parameter changes in video quality and resolution while maintaining effective storage management. The circulation recording method adapts to different video parameters by adjusting the circulation region size and overwrite timing, achieving both simplified management and high adaptability through parameter-driven dynamic allocation.
Data Source
AI summary
A video recording apparatus with a pre-event circulation recording function is provided. A limitation on memory capacity may be removed by recording a pre-event video directly on a nonvolatile storage medium, such as a hard disk drive (HDD), without using a buffer according to a circulation recording method during pre-event recording performed to record videos before and after an event occurs.