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Infrared-communications-scheme

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Infrared communications scheme

Details

Inventors: Martnelli, John K.; Ritchey, Wendell W.; Reading, Leslie J.;
Assignee: Interlink Electronics, Inc. (Camarillo, CA)
Primary Examiner: Negash; Kinfe-Michael
Assistant Examiner:
Attorney, Agent or Firm: Brooks & Kushman P.C.

Infrared communications scheme for an infrared transmitting device having a light emitting diode (LED) ramps up the power of a carrier frequency signal applied to the LED in a given time interval to a given value. The carrier frequency signal is then frequency modulated with a data message for transmission by the LED. The power of a DC signal applied to the LED may then be ramped up in a given time interval to a given value before the carrier frequency signal is modulated with a data message. After transmission of the data message, the power of the carrier frequency signal applied to the LED is ramped down in a given time interval to a given value. The power of the DC signal applied to the LED is then ramped down in a given time interval to a given value.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an infrared communications scheme in which multiple infrared remote control devices can transmit simultaneously without interference from the other devices.
It is another object of the present invention to provide an infrared communications scheme in which multiple infrared remote control devices can transmit simultaneously without interference from other IRC and CIR devices.
It is a further object of the present invention to provide an infrared communications scheme in which data can be transmitted at a data rate of around 50 Kbits per second in addition to transmitting analog audio of FM radio quality.
It is still another object of the present invention to provide an infrared communications scheme in which simultaneous full duplex communication may be accomplished using two channels.
It is still a further object of the present invention to provide an infrared communications scheme suitable for a network configuration (multiple transmitters and receivers).
In carrying out the above objects and other objects, the present invention provides a communications method for an infrared transmitting device having a light emitting diode (LED).
The method includes ramping up the power of a carrier frequency signal applied to the LED in a given time interval to a given value.
The carrier frequency signal is then frequency modulated with a data message for transmission by the LED.
The method may further include ramping up the power of a DC signal applied to the LED in a given time interval to a given value before the carrier frequency signal is modulated with a data message.
After transmission of the data message, the power of the carrier frequency signal applied to the LED is ramped down in a given time interval to a given value.
The power of the DC signal applied to the LED is then ramped down in a given time interval to a given value.
Further, in carrying out the above objects and other objects, the present invention provides a device and system employing the procedure of the above-described method

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