Surface acoustic wave-matched filter and differential detector for demodulating spread spectrum signals
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United States of America Patent
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Sep 30, 2003
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N/A
app pub date -
Oct 7, 1999
filing date -
Oct 7, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surface acoustic wave-matched filter is disclosed which comprises: an input transducer provided on a piezoelectric substrate surface; a first output transducer, that is, a forward output transducer encoded in correspondence to a pseudo-noise code sequence for spectrum spreading and provided on the substrate surface; and a second output transducer, that is, a backward output transducer encoded in correspondence to the pseudo-noise sequence code and provided on the substrate surface at the succeeding to the forward output transducer by the length of the pseudo-noise code sequence as viewed from the input transducer. With the use of the surface acoustic wave-matched filter, it is possible to realize a differential detector for demodulating spread spectrum signals.
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