Method of demodulation
US5142237A · kind A · utility
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27Claims
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Key dates
| Filing date | May 3, 1990 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | May 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/027
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of demodulation is provided for demodulating a signal in which different data symbols are represented by different frequencies, such as a modem. A set of undelayed and a set of delayed sample values are provided and a frequency transform calculation is performed on the difference between the first N undelayed values and the last N delayed values. An early/late synchronization decision is taken dependent on the difference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.