Acoustic logic circuits

Details Acoustic logic circuits Acoustic logic circuits

1991-05-29

1992-08-11

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367903, 367 87, G01S 1500

Patent

active

051385864

ABSTRACT:
An acoustic sensor functioning as a digital logic device comprises a resonant chamber, at least one port establishing a first resonant frequency therein when the port is closed and establishing a second resonant frequency therein when the port is open, a transmitter in communication with the chamber and tuned to either of the first or second resonant frequencies and a receiver in communication with the chamber for providing a digital logic output. When the port is closed or open and when the transmitter is tuned to the second or first resonant frequencies, respectively, the device functions as an inverter.
In another form an acoustic logic device comprises a resonant chamber, at least two ports establishing a plurality of resonant frequencies therein depending upon whether the ports are all open, all closed or some open and the rest closed, a receiver in communication with the chamber for providing a digital logic output, and a transmitter in communication with the chamber and tuned to one of the resonant frequencies. When the device includes two ports and the transmitter is tuned to the resonant frequency corresponding to both of the ports being closed, or both of the ports being open or one of the ports being open and the other port being closed, the device functions as an AND gate or a NOR gate or an EXCLUSIVE OR gate, respectively. Also provided are acoustic logic devices having three or more ports.

REFERENCES:
patent: 3665211 (1972-05-01), Owens et al.
patent: 3694800 (1972-09-01), Frank
patent: 4494841 (1985-01-01), Marcus
patent: 4850232 (1989-07-01), Markis

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