| 摘要 |
PURPOSE: An alternative frequency service confirmation method is provided to surely discriminate whether or not a service at an alternate frequency is the same as a service at a frequency that is being received at present. CONSTITUTION: An alternative frequency of e.g. a digital shortwave signal like a DRM signal can easily and satisfactorily be checked whether or not the same service is transmitted before a fast seamless switching to the alternative frequency can be performed. The inventive method to perform such a checking is characterized by a respective correlation of at least two sets of samples taken from the signal transmitted on the alternative frequency having a predetermined time relationship(DELTA tcorr), and a comparison of the respective correlation results, i.e. comparison of the time(t1) of occurrence of a correlation peak included in a first correlation result with the time(t2) of occurrence of a correlation peak included in a respective further correlation result, to verify that both services are the same when the time relationship(t2-t1) between correlation peaks is the same as the predetermined time relationship(DELTA tcorr) of the at least two sets of samples.
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