Patent ID: 6611198
Filing Date: 2003-08-26
Classification: G06K

Abstract:
An identification system including a reader for reading an object and providing a first output signal if said object has certain predetermined characteristics readable by said reader, said system comprising:a detector detecting the presence of the object in a field of inspection of said detector; a timer responsive to said detector and started by the detection of the object in said field of inspection; and a processor responsive to said detector and said timer, said processor generating a second output signal if the object is disposed within said field of inspection at least a predetermined period of time, wherein said detector includes an antenna, a PSK receive path disposed between said antenna and a first circuit node, an FSK receive path disposed between said antenna and said first circuit node, and a first filter for attenuating a first RF frequency disposed between said first circuit node and a second circuit node, said PSK receive path includes a second filter for attenuating said first RF frequency and passing frequencies approximately one-half of said first RF frequency, and said FSK receive path includes a discriminator and a third filter, said third filter for attenuating frequencies approximately one-half of said first RF frequency and above and passing RF frequencies less than one-fourth of said first RF frequency.