Infrared communications scheme
First Claim
1. An infrared communications system comprising:
- a transmitter including a light emitting device (LED), an oscillator for applying a carrier frequency signal to the LED, a modulation ramp generator for ramping up the power of a carrier frequency signal applied to the LED in a given time interval to a given value, and a data terminal operable with the oscillator for frequency modulating the carrier frequency signal of the oscillator with a data message for transmission of an optical signal within a given channel having a given carrier frequency by the LED; and
a receiver tuned to the carrier frequency of the optical signal for receiving the optical signal from the transmitter, wherein the transmitter is operable to transmit multiple optical signals within given channels having different carrier frequencies.
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Accused Products
Abstract
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.
24 Citations
3 Claims
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1. An infrared communications system comprising:
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a transmitter including a light emitting device (LED), an oscillator for applying a carrier frequency signal to the LED, a modulation ramp generator for ramping up the power of a carrier frequency signal applied to the LED in a given time interval to a given value, and a data terminal operable with the oscillator for frequency modulating the carrier frequency signal of the oscillator with a data message for transmission of an optical signal within a given channel having a given carrier frequency by the LED; and a receiver tuned to the carrier frequency of the optical signal for receiving the optical signal from the transmitter, wherein the transmitter is operable to transmit multiple optical signals within given channels having different carrier frequencies. - View Dependent Claims (2, 3)
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Specification