Facsimile module self-diagnostic system for digital circuit multiplication equipment
US6384938B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1999 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Jun 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A facsimile module self-diagnostic system is provided that can detect a failure occurring in the transmission-side demodulation circuit or in the reception-side re-modulation circuit in a facsimile module. A test facsimle signal generation circuit (10) is provided on the transmission side of the facsimile module. A test facsimile signal judgement circuit (25) is provided on the reception side of the facsimile module. In a test facsimile signal judgement zone, the test facsimile signal judgement circuit (25) inspects a test DCS (Digital Command Signal) signal at the first stage and inspects a test TCF (Training Check) signal at the second stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.