Method of realigning the local oscillators of a receiver and device for implementing the method
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Jul 13, 1992
filing date -
Nov 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method of realigning the local oscillators of a receiver, as well as a device for implementing the method. In a receiver with a high frequency/intermediate frequency translation oscillator, an intermediate frequency/baseband translation oscillator, and a sampling oscillator receiving a signal modulated by at least one circuit for inverse fast Fourier transform FFT.sup.-1 computation according to a multicarrier modulation of OFDM (Orthogonal Frequency Division Multiplexing) type with addition of a transition interval at the start of each transmission interval. The spectrum of the signal has two master lines with a fixed frequency difference between them. The method is characterized by the following steps: (1) determination of the start of a transmission interval; (2) determination of the position of the two master lines; and (3) computation of the variation of the phases of these two lines as a function of time, and exploitation of the result to set the frequency of the sampling oscillator and of the intermediate frequency baseband translation oscillator. The invention will find particular application to digital television.
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