Computer controlled transversal equalizer
US5353244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1993 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Sep 13, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G5/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adjustable equalizer network has a series chain of N all pass amplifier stages driving N+1 scaling circuits connected to a final summing circuit that includes circuitry to adjust the frequency response at M+1 frequency control points to obtain a predetermined ripple free minimum phase shift frequency response over a given frequency range. The scaling circuits have scaling coefficients, of magnitude and sign determined by Fourier analysis and an appropriate truncation function, such that the filter has a pass band representative of M+1 contiguous bands conjointly encompassing the frequency range. Calculation of the scaling coefficients and control of the scaling circuits is accomplished through digital computation and manipulation. Some embodiments may use passive circuits or linear analogue circuits as scaling circuits, controlled manually or by a computing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.