초록 ▼

The universal electronic identification tag is for use with a variety of readers of different designs including a control reader which can be used to control the operations of the universal tag. A reader interrogates a tag by transmitting a carrier. The universal tag comprises a transducer, a modula

The universal electronic identification tag is for use with a variety of readers of different designs including a control reader which can be used to control the operations of the universal tag. A reader interrogates a tag by transmitting a carrier. The universal tag comprises a transducer, a modulator connected across the transducer, and a control means. The control means causes the modulator to drive the transducer with a plurality of different message waveforms after interrogation by a reader, the tag identity being embedded in each of the message waveforms. The message waveforms can be transmitted either simultaneously, sequentially, or both ways. A message waveform is comprised of a sequence of contiguous waveform segments, each waveform segment representing the value of an N-bit group, N being an integer. A waveform segment is a periodic signal characterized by the parameters frequency, phase, and amplitude. The waveform segments which represent the values of an N-bit group are differentiated by the values of at least one parameter.

대표청구항 ▼

[ What is claimed is:] [1.]1. A tag for use with a plurality of readers of different designs, each reader being operable with associated tags, a reader performing an interrogation by transmitting a carrier, an associated tag responding to an interrogation with an associated-tag message waveform that

[ What is claimed is:] [1.]1. A tag for use with a plurality of readers of different designs, each reader being operable with associated tags, a reader performing an interrogation by transmitting a carrier, an associated tag responding to an interrogation with an associated-tag message waveform that can be read by the reader, the tag comprising:a transducer;a modulator connected across the transducer;a control means for causing the modulator to drive the transducer with a plurality of different message waveforms after interrogation by a reader, each of the different message waveforms emulating a different associated-tag message waveform, the tag identity being embedded in each of the different message waveforms.