Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-02-11
1999-04-27
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359142, 359146, 359172, 34082572, 348734, H04B 1006, H04B 1000
Patent
active
058985131
ABSTRACT:
A circuit and method for detecting an edge of the carrier frequency of received data from a remote IR communications device by an Infrared Communications Controller is disclosed. During the receiving of IR signals from a remote IR communications device such as, for example, a TV, VCR or stereo, a frequency window of frequencies above and below a predetermined carrier frequency is opened. If the edge of the carrier frequency of the received data falls within the frequency window, communications are established between the IrCC and the remote IR communications device. If the negative edge of the carrier frequency of the received data does not fall in the frequency window of frequencies, then the system aborts communications. Provisions are made for a ten percent (10%), a twenty percent (20%) frequency window, and a forty percent (40%) frequency window. Other configurations combining various percentage frequency windows are also disclosed as well as methods for generating the frequency windows.
REFERENCES:
patent: 5436853 (1995-07-01), Shimohara
patent: 5617236 (1997-04-01), Wang et al.
Multi-Standard Infrared Transeiver--Crystal Semiconductor Corporation -1994 .
Gist Ronald V.
Popper Jay D.
Negash Kinfe-Michael
Standard Microsystems Corp.
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