Title:
【発明の名称】スペクトル拡散信号復調用遅延検波方式
Document Type and Number:
Japanese Patent JP3379636
Kind Code:
B2
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.
Inventors:
Hiroyasu Ishikawa
Hideyuki Shinonaga
Hideyuki Shinonaga
Application Number:
JP28496198A
Publication Date:
February 24, 2003
Filing Date:
October 07, 1998
Export Citation:
Assignee:
KDDI CORPORATION
International Classes:
H03H9/42; G06G7/195; H04B1/707; H04B1/7093; H04L27/22; (IPC1-7): H03H9/42; H04B1/707; H04L27/22
Domestic Patent References:
| JP7283761A |
Attorney, Agent or Firm:
Manabu Otsuka