Frequency spectrum measurement apparatus
US6418162B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/309
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A frequency spectrum measurement apparatus sweeps a desired frequency range using multiple scan lines. A controller provides a non-contiguous sequence of input values to a frequency synthesizer operating as a local oscillator for generating a non-contiguous frequency output signal over the desired frequency range with each value offsetting a current frequency output signal from a previous frequency output signal. A mixer receives an input signal and the variable frequency synthesizer signal for generating an intermediate frequency signal that is filtered through a bandpass filter. The power of the intermediate frequency signal output of the bandpass filter is measured and displayed. The frequency spectrum measurement apparatus is usable in measuring out of channel emissions of a terrestrial RF broadcast digital television signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.