Automatic aerial attenuator
US4039953A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Nov 6, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transmission system receiver compares the received signal power in a relatively narrow frequency band with the received signal power in a relatively wide frequency band, which embraces the narrow frequency band, to obtain an indication of the "SINAD ratio" which refers to the signal plus noise plus distortion to noise plus distortion ratio. The receiver also includes an automatic control system for comparing the indication with a reference and for adjusting an attenuator in response to disparity between the indication and the reference in a sense to increase the SINAD ratio above a predetermined level, or to adjust the SINAD ratio to an optimum value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.