Quadrature detection method, quadrature detection device and radio wave timepiece
US7839725B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2006 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Aug 8, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/003
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio wave timepiece A and a quadrature detection device for executing a quadrature detecting method are disclosed including a receiving antenna 14 for receiving a carrier wave of a long wave standard radio wave on which time information is multiplexed, a quadrature detection circuit 18 for performing quadrature detection of the carrier wave in response to a reference clock CK1, commonly used for timekeeping by a time counter 8, to obtain an in-phase component I and a quadrature component Q of the carrier wave for obtaining an amplitude AN,m of the carrier wave, and a time correction means 22, 24, 26 for obtaining time information depending on the amplitude of the carrier wave from the quadrature detection circuit 18. The time counter 8 is responsive to time information delivered from the time correction means to correct current time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.