Demodulating digital video broadcast signals
US6317473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1998 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | May 1, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0087
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to correct for common phase error in demodulated digital video broadcast signals which comprise data modulated on a multiplicity of spaced carrier frequencies, a demodulator includes PA1 analog to digital conversion means (20) for providing a series of digital samples of the broadcast signal, real to complex conversion means (22) for converting each digital sample to a complex number value, Fourier Transform means (24) for analysing the complex number values to provide a series of data signal values in complex number format for each carrier frequency, and signal processing means for processing the series of data signal values including phase error correcting means (30), PA1 the phase error correcting means including means for converting the data signal values from a complex number format to a phase angle format, means for determining a common phase error by assessing the phase of continual pilot signals in the broadcast signals and determining the variation in phase of the continual pilot signals between consecutive symbols in the broadcast signals, and means for subtracting the common phase error from the data signal values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.