Zero Phase Start Calculation Circuit for Array Reader Magnetic Recording Systems
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Solution Overview
Problem
In array reader magnetic recording systems, the separation of read heads causes phase offsets between signals, leading to interference from adjacent tracks and challenges in accurately retrieving data, as existing technologies fail to effectively compensate for both integer and fractional phase differences.
Innovation Solution
An apparatus with an array reader and zero phase start calculation circuit that samples signals from multiple read heads, calculates phase differences, and generates integer and fractional phase adjustment signals to align the signals, using orthogonal preamble patterns to remove adjacent track interference and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple read heads are used in an array reader to read from magnetic storage medium, then data reading capability is improved, but phase offsets between signals from different read heads cause adjacent track interference and reduce measurement precision
Solution Approach 1:
The patent applies parameter changes by calculating phase offset values based on the physical separation distances between read heads and adjusting signal phases accordingly. The system determines integer and fractional phase offsets as parameters and applies compensation to align signals from multiple read heads, resolving the phase misalignment issue while maintaining the productivity benefits of using multiple heads.
2Adaptability or versatility
If read heads are separated to read different tracks, then track access capability is improved, but phase offset between signals increases causing interference
Solution Approach 1:
The patent converts the harmful phase offset effect into a beneficial alignment mechanism. By calculating phase offsets based on known read head separations and applying compensation, the system transforms the potential interference from separated read heads into a controlled parameter that can be corrected. This allows the system to maintain adaptable track access while eliminating the harmful interference through phase alignment.
3Measurement precision
If phase offset compensation is implemented for array reader signals, then signal alignment accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the phase offset compensation into distinct functional components: a phase offset calculation circuit that determines integer and fractional offsets, and separate phase alignment circuits that apply the compensation. This segmentation allows the complex task of phase alignment to be divided into manageable stages, improving signal alignment accuracy while organizing the system complexity into modular, understandable blocks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable data detection by compensating for phase offsets, allowing phase-aligned signals to be combined, thereby enhancing data retrieval accuracy and reducing interference from adjacent tracks.
Implementation Method 1
the previously stored magnetic flux pattern induces a current in the head assembly that can be converted to the previously recorded digital data
Data Source
AI summary
An apparatus includes an array reader with multiple of read heads operable to read a preamble pattern from a magnetic storage medium. A number of analog to digital converters are operable to sample an output of each of the read heads to generate digital data streams for the preamble pattern. A zero phase start calculation circuit is operable to calculate a phase offset between the digital data streams and to generate an integer phase adjustment signal and a fractional phase adjustment signal.