Valid Recording Period Control Unit for Hard Disk Data Encoding
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Solution Overview
Problem
Existing information reproduction and recording systems using a three-line serial peripheral interface record invalid data between music tracks, causing a strange transition when reproducing music on hard disks, due to the lack of information on track intervals and start/end signals in the data transfer process.
Innovation Solution
An information reproduction and recording apparatus with a valid recording period control unit that suspends the transfer of clock signals LRCK and BCK when a SPACE signal is not output, preventing the recording of invalid data by encoding only during valid data transfer periods, using a music data reproducing unit, high speed encoder, and HDD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-line serial peripheral interface is used for data transfer, then the device complexity is reduced, but invalid data is recorded causing strange track transitions
Solution Approach 1:
A valid period signal generation unit is introduced as an intermediary component between the data transfer interface and the recording system. This unit generates valid period signals based on the SPACE signal from the CD, which then control the encoding process to prevent invalid data from being recorded during track intervals, thus resolving the reliability issue without increasing interface complexity
Solution Approach 2:
The system performs preliminary detection of the SPACE signal to determine valid recording periods before actual data recording occurs. By anticipating when valid data will be present and when track intervals will occur, the system can pre-configure the encoding process to only record during valid periods, preventing the strange transition problem
2Productivity
If continuous data transfer is performed without valid period control, then the productivity is improved, but invalid data is encoded and recorded
Solution Approach 1:
The encoding process is converted from continuous to periodic operation, synchronized with the valid period signals generated from the SPACE signal. The encoder operates only during valid periods when music data is present and remains inactive during track intervals, eliminating invalid data recording while maintaining high transfer speeds during active periods
3Loss of information
If track interval data is included in the recording, then the completeness of data transfer is improved, but the music reproduction quality deteriorates
Solution Approach 1:
The system extracts and separates valid music data from invalid track interval data by using the SPACE signal to generate valid period signals. These signals enable the encoder to selectively process only valid music data portions, extracting them from the continuous data stream while excluding track interval data, thus preserving music reproduction quality
Data Source
AI summary
An information reproduction and recording apparatus able to prevent invalid data not required for recording from being recorded on a recording medium when transferring reproduced information by a small number of signal lines such as a three-line serial peripheral interface, wherein a music data reproducing unit outputs a data signal DATA and clock signals LRCK and BCK to a valid recording period control unit and outputs a SPACE signal to the valid recording period control unit while outputting music data containing track interval data, the signals are transferred to a high speed encoder and the data signal DATA is encoded and recorded on a hard disk by an HDD based on the clock signals LRCK and BCK while the SPACE signal is being output, and the valid recording period control unit suspends transfer of the clock signal LRCK and prevents recording of invalid data on the hard disk while the SPACE signal is not being output.