Signal spectrum display apparatus
US4380732A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1980 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Aug 22, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/408
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal spectrum display apparatus comprises a plurality of band-pass filters respectively having filtering bands of different center frequencies and operating to filter an input signal thereby to band-divide the input signal fed through an input terminal a plurality of rectification and charging circuits connected respectively to said band-pass filters, a display section having displaying systems of the same number as the band-pass filters respectively corresponding to the band-pass filters and for displaying the outputs of the rectification and charging circuits, and a switch connected between a point between the rectification and charging circuit and the display section, and the ground. A capacitor of the rectification and charging circuit charges and discharges during said switch is closed, whereby the input signal level is displayed in real-time in the display section, and stops charging and discharging during the switch is opened, whereby the maximum input signal level is successively displayed in the display section in response to the output voltage held in response to successive higher input signal voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.