Digital tone detector
US5274579A · kind A · utility
10Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1993 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Mar 9, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/15
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital tone detector utilizes pseudo sinusoidal quadrature reference signals in combination with a unique summation rule for summing the resultant quadrature accumulations to obtain a substantial improvement in the sidelobe responses of the filter. The digital tone detector also utilizes a "stepped" observation window to further provide a substantial improvement in the third harmonic response of the filter. The digital tone detector can be implemented using a hardware implementation, a combination hardware and microprocessor implementation, and a microprocessor only implementation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.