Demodulation apparatus and communication system using the same

Details Demodulation apparatus and communication system using the same Demodulation apparatus and communication system using the same

1995-10-18

1997-08-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313R, 310313B, 364821, H01L 4108

Patent

active

056613580

ABSTRACT:
A demodulation apparatus and a communication system using the same are disclosed. The apparatus comprises code generation means for generating a reference spread code corresponding to a first signal modulated by a spread code, and an elastic surface wave element for receiving the first signal and a second signal output from the code generation means, and outputting a demodulated information signal. The elastic surface wave element comprises a piezoelectric substrate, a first excitation electrode, formed on the piezoelectric substrate, for generating a first elastic surface wave which propagates in a predetermined direction in accordance with the first signal, a second excitation electrode, formed on the piezoelectric substrate, for generating a second elastic surface wave which propagates in a direction opposite to the predetermined direction in accordance with the second signal, and an acousto-electric converter, formed between the first and second excitation electrodes on the piezoelectric substrate, for outputting a convolution signal of the first and second signals on the basis of the first and second elastic surface waves, wherein the acousto-electric converter selectively converts an elastic surface wave having a wave number twice a wave number of the first and second elastic surface waves into an electrical signal.

REFERENCES:
patent: 5003213 (1991-03-01), Mochuzuki et al.
patent: 5164628 (1992-11-01), Egara et al.
patent: 5185548 (1993-02-01), Egara et al.
patent: 5200663 (1993-04-01), Mochizuki et al.

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