Broadcasting Signal Processing Apparatus with FAT File System Data Integrity
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Solution Overview
Problem
Conventional hard disc drive (HDD) systems for personal video recorders (PVRs) face data loss due to abnormal termination during broadcast signal recording, as the file allocation table (FAT) does not properly record 'cluster end data' in case of power loss or other interruptions, leading to unrecognized recorded data.
Innovation Solution
A broadcasting signal processing apparatus and method that includes a control part to update the FAT by adding temporary file termination data and converting it to normal file termination data upon recording stop, ensuring data integrity even during abnormal termination, using a FAT file system to manage video and audio signals on the HDD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional FAT file system is used for recording broadcast signals, then storage capacity and ease of operation are improved, but data integrity is worsened during abnormal termination
Solution Approach 1:
The patent applies preliminary action by pre-defining a specific marker value (0xFFFF) in the FAT structure to indicate abnormal termination. This marker is prepared in advance and automatically written when abnormal termination occurs, ensuring the FAT reflects the actual recording state without requiring complex real-time analysis or user intervention.
Solution Approach 2:
The patent implements feedback by continuously monitoring the recording state and comparing it with the FAT records. When abnormal termination is detected (e.g., power loss during recording), the system provides feedback by updating the FAT with the abnormal termination marker, creating a closed-loop mechanism that ensures data integrity reflects the actual recording status.
2Productivity
If cluster end data is not recorded in FAT during abnormal termination, then recording speed is improved, but data loss occurs
Solution Approach 1:
The patent extracts the essential information needed for data integrity (the abnormal termination fact) and separates it from the complete recording process. By using a simple marker value (0xFFFF) in the FAT rather than recording detailed cluster end data, the system captures the critical state information without the overhead of complete data logging, thus preventing data loss while maintaining recording efficiency.
3Reliability
If FAT is updated continuously during recording, then data integrity is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the FAT structure with specific marker values (0xFFFF for abnormal termination, 0x0000 for normal termination) rather than implementing complex update mechanisms. This parameter-based approach simplifies the FAT update process to basic write operations while maintaining data integrity, avoiding the need for complex transaction management or validation systems.
Data Source
AI summary
A broadcast signal processing apparatus that is capable of recording and reproducing an externally received broadcast signal with respect to a hard disc drive, and which includes a broadcast signal receiving part for receiving a broadcast signal, demodulating and dividing the received broadcast signal into a video and audio signal, a hard disc drive formatted in a file allocation table (FAT) form, and wherein the HDD has a FAT and a data region, and a control part for recording, searching and reproducing the audio and video signals with respect to the HDD based on the FAT file system. When the FAT is updated, the apparatus is further capable of adding a temporary file termination data to an end of the updated data, and converting, corresponding to a recording stop signal, the temporary file termination data into a normal file termination data according to the FAT file system.