Method and apparatus for spectral analysis in a disk recording system
US5784296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of performing spectral analysis of signals recorded by a magnetic recording or storage system is provided using a modified channel chip of the system. The modified channel chip enables measurement of harmonic components of the recorded signal. The recorded signal is a periodic analog signal having a period N. The method is performed by reading the recorded periodic analog signal and converting the signal into a discrete time periodic signal. The discrete time periodic signal is digitally sampled at predetermined intervals, and the digital samples are selectively accumulated in a register or registers of the channel chip. Incoming digital samples are accumulated by selectively being added to contents of the registers, or alternately being added and substracted to contents of a single register. The accumulated results represent summations used to determine harmonic coefficients of the recorded signal. The harmonic coefficients can then be used to compute a phase and amplitude for a particular harmonic k of the recorded signal. The modified channel chip used to perform the method of spectral analysis includes a simple harmonic sensor for performing the accumulations. The harm…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.