Filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 11, 2019
Grant Date -
Jun 7, 2018
app pub date -
Jan 22, 2018
filing date -
Mar 21, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Frequency domain (FDTF) and time domain (TDTF) trans-filters compress in-band AWGN, demodulate input signals and have no threshold due to applied noise. Two parallel frequency selective networks with opposite amplitude vs frequency slopes are designed to remain 180 degrees out of phase over the signal band in the FDTF whereas two parallel delay networks are used in the TDTF. Output amplitudes are equal at band center and are summed producing a monotonic amplitude vs frequency characteristic going thru zero at center frequency with abrupt phase reversal. This produces the parabolic output noise density and differentiates applied signals. Absence of nonlinear circuit components and product devices prevents generation of noise×noise products, avoiding the threshold phenomenon. Exponentially modulated digital signals produce output impulses due to the slope and abrupt phase reversal. The impulses have strong fundamental frequency components and may be recovered at baseband without frequency conversion. Cascading trans-filters increases noise reduction and impulse amplitude. The trans-filter algorithm may be used separately or in conjunction with one or more hardware trans-filters.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- H04B Class
- 28.17 % this patent is cited more than
- 6 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Dec 11, 2026 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 11, 2030 |
