Importance

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Abstract

An electronic article surveillance system which is capable of reliably identifying and discriminating between the different signatures of tags and labels which may come to pass in its vicinity, improving the reliability of the system and even permitting the tags and labels to be classified by type, and separately addressed, includes a receiver for detecting signals resulting from such tags or labels which incorporates improvements in its filtering and processing sections. A linear phase (constant group delay) filter is used to more effectively preserve the signal which is received, and thereby improve the signal which is ultimately delivered to the processor which follows. The processor is provided with a 'hysteresis-type' threshold detector which operates to further preserve the original signal by improving the shape (width) of the pulse which is ultimately delivered to the processor following conversion from analog form, and an adaptive processing routine which varies the subsequent processing of detected signals according to changes within the system to improve the system's ability to discriminate between the different signals which are received.

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First Claim