Ultrasonic and infrared transmitter with tunable carrier...

Details Ultrasonic and infrared transmitter with tunable carrier... Ultrasonic and infrared transmitter with tunable carrier...

2006-10-17

2006-10-17

Vanderpuye, Kenneth (Department: 2613)

Optical communications

Transmitter

C398S183000, C367S137000

Reexamination Certificate

active

07123842

ABSTRACT:
The present invention discloses an ultrasonic and infrared transmitter with tunable carrier frequency, which comprises an oscillation frequency, a frequency divider, a multiplexer and an output buffer on an integrated circuit in association with an infrared light emitting diode or ultrasonic transducer to transmit infrared or ultrasonic carrier signals. The oscillation frequency is divided by the frequency divider and sent to one input of the multiplexer which has the other input connected with a user-controlled data, and finally the output buffer outputs the data. The integrated circuit provides two carrier signal output ports, and the carrier signals from these two output ports are inverted to each other, thus the described apparatus can transmit not only infrared carrier signal but also ultrasonic carrier signal.

REFERENCES:
patent: 5155614 (1992-10-01), Carmen et al.
patent: 6617937 (2003-09-01), Jue et al.
patent: 154758 (1982-04-01), None
patent: 06197149 (1994-07-01), None
“From push-pull circuit to push-pull voltages.” IEEE Standard Dictionary of Electrical and Electronics Terms. 3rd ed. 1984.
“Octal bus buffer with 3 state outputs HC 540: inverted—HC 541 non inverted.” SGS-Thomson Microelectronics (Oct. 1993): 12 pp. Dec. 28, 2004 <http://mc.ict.tuwien.ac.al/uebungsteil/projekte/ED1/Logic/74HC541.PDF>.

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