Systems and methods for recovery of a sub-carrier signal from a stereophonic multiplexed signal
US7684774B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2006 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Jul 19, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H40/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed herein are systems and methods for recovering a sub-carrier signal from a multiplexed signal having an embedded pilot tone signal. The recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for generating a frequency-doubled signal from the recovered pilot signal, and for phase-shifting the frequency-doubled signal by a pre-determined phase difference from the embedded pilot tone signal. Another recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for phase-shifting the pilot signal by a pre-determined phase difference from the embedded pilot tone signal, and for generating a frequency-doubled signal from the phase-shifted signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.