Narrowband parameter estimator
US4947361A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Sep 28, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0012
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A narrowband parameter estimator circuit is described which can be used to estimate the frequency and the relative power of narrowband interference tones which reside in a wideband information signal. A two-weight adaptive filter with a phase/frequency-lock loop circuit works in conjunction with a stepped synthesizer to lock onto the individual narrowband interference tones. A lock-detect circuit signals a digital logic unit to record the frequency of the stepped synthesizer and to measure the power in the adaptive filter output signal. This same output signal is used to cancel the unwanted tone in the wideband information signal being transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.