Infra-red data communications system for coupling a battery powered data entry device to a microcomputer
Method and device for initializing data, and particularly seismic data, acquisition apparatus
Learning-functionalized remote control receiver
Tuner control apparatus having tune-by-label capability and using alphabetical label storage Patent #: 4914517
ApplicationNo. 615567 filed on 11/19/1990
US Classes:398/106, REMOTE CONTROL398/130Transmitter and receiver
ExaminersPrimary: Coles, Sr., Edward L.
Assistant: Negash, Kinfe-Michael
Attorney, Agent or Firm
International ClassH04B 010/00
AbstractA communication system comprising a wireless keyboard for emitting infra-red signals, a receiving unit for converting the infra-red signals to an electrical signal, a tuning and amplifying circuit coupled to the receiving unit for tuning and amplifying the electrical signals, a carrier filtering circuit for removing the carrier component of the input signal, a single-shot circuit coupled to the carrier filtering circuit for converting its input signal to a known code wave form, and a microprocessor for receiving the code wave. The invention allows multiple users to operate their wireless keyboards without interference.