Timing extraction device and data transmission device using the timing extraction device
US5442656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1993 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Jan 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2338
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a timing extraction device coupled to a demodulator which derives a real signal component and an imaginary signal component from a signal received via a transmission line, a band-pass filter extracts a 1/2-Nyquist frequency from either the real signal component or the imaginary signal component. The 1/2-Nyquist frequency includes two symmetrical frequency components. A vector conversion unit processes the 1/2-Nyquist frequency so that a vector signal corresponding to one of the two symmetrical frequency components of the 1/2-Nyquist frequency is output from the vector conversion unit. A square multiplier squares the vector signal received from the vector conversion unit and thereby generates a phase error signal indicating timing information concerning the analog signal. The phase error signal has an angle which is double an angle of the vector signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.