Measurement of noise in a communication channel
US3970795A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jul 16, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J1/16
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
TNR (Traffic Noise Ratio) is defined as the ratio of the portion of the noise representing a multi-channel signal that occurs in a narrow bandwidth (including inherent, and intermodulation) to the noise in the same bandwidth, in the absence of a traffic signal in that bandwidth, under specified traffic conditions. The TNR of a communications link is measured by measuring the noise power level in a predetermined bandwidth in a quiet channel with reference to a signal representative of the power that would be in the quiet channel if it was loaded under peak traffic conditions. The noise power level is measured using a digitally stepped automatic attenuator controlled by a feedback loop which includes filters for isolating the noise in the quiet channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.