Frequency analyzing device
US6374189B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1999 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jun 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A frequency analyzing device for detecting a signal component of a predetermined analytic frequency to be analyzed in an input signal includes a multiplication circuit and an integration circuit. The multiplication circuit controls a switched capacitor circuit for discretely storing an input signal using a predetermined pulse signal whose frequency changes according to an amplitude of an orthogonal function system signal having the analytic frequency, and outputs charges representing a multiplication result of the input signal and the orthogonal function system signal. The integration circuit integrates the charges output from the multiplication circuit and outputs integration values as signal components of the analytic frequency contained in the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.