Signal processing for media type identification
US8291001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2008 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Aug 3, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J29/393
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for identifying a type of recording medium using a time-varying output signal from a photosensor includes amplifying the time-varying output signal of the photosensor; converting the amplified time-varying output signal of the photosensor to digitized data points using an analog to digital converter thereby creating a first set of digitized data; filtering the first set of digitized data to provide a low pass data set; filtering the first set of digitized data to provide a high pass data set; computing the standard deviation of the low pass data set; computing the standard deviation of the high pass data set; and identifying the recording medium type using values from both the standard deviation of the low pass data set and the standard deviation of the high pass data set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.