Method and apparatus for identifying the components of a signal

Details Method and apparatus for identifying the components of a signal Method and apparatus for identifying the components of a signal

1986-07-03

1988-10-11

Kemeny, Emanuel S.

Boots, shoes, and leggings

364604, 364726, 455205, 358281, G01R 2300

Patent

active

047776056

ABSTRACT:
Fast Fourier Transform methods of analyzing signal frequencies spectra yield results from zero frequencies upwards. Thus, when the frequency band of interest is not at very low frequencies a lot of wasted calculations may be performed, and resolution and computation time have to be traded-off against each other, often falling short of the requirements for both. A technique is described in which the signal to be analyzed is passed through an anti-alias filter and initial transform data is collected by undersampling. In a railway track circuit receiver which is to identify a predetermined carrier frequency or FSK signal, the anti-alias filter is selected to exclude frequencies other than those in a frequency band including the particular track signal so that there is no ambiguity in the calculated transform results.

REFERENCES:
patent: 4726069 (1988-02-01), Stevenson
patent: 4730257 (1988-03-01), Szeto

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