Method of verifying preamplifier circuit functions, and magnetic record regeneration apparatus using the same
US7233452B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2005 |
| Grant date | Jun 19, 2007 |
| Priority date | — |
| Expiry date | Dec 14, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a preamplifier circuit of a magnetic record regeneration apparatus with a write system and a read system, certainly verifying a write function in a short period of time. The preamplifier circuit includes, in the write system, a write driver; a current-voltage conversion circuit for converting the write current from the write driver into a corresponding voltage; a waveform shaping circuit for converting the output voltage from the current-voltage conversion circuit into a full-wave rectified waveform; a peak-hold circuit for holding a peak value of the output from the waveform shaping circuit; a filter circuit for outputting an average voltage of the output from the waveform shaping circuit; and a determination circuit for determining that the write driver is abnormal based on each output status of the peak-hold circuit and the filter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.