Infrared transmitter
First Claim
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1. An infrared transmitter for transmitting a signal via an infrared ray, the infrared transmitter comprising:
- a signal converter for converting the signal into an infrared signal;
an oscillator for oscillating a carrier frequency of the infrared signal;
a controller for adjusting a cutoff frequency of a filter according to the carrier frequency; and
the filter provided between the oscillator and the signal converter, the filter having the cutoff frequency adjusted by the controller,wherein the filter includes a variable capacitance diode so that the cutoff frequency is adjusted in a non-step manner as the controller adjusts a voltage applied to the variable capacitance diode, andthe signal converter comprises an infrared light-emitting diode (IRLED).
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Abstract
An infrared transmitter transmits a signal via an infrared ray. The infrared transmitter includes: a signal converter for converting the signal into an infrared signal; an oscillator for oscillating a carrier frequency of the infrared signal; a controller for adjusting a cutoff frequency of a filter according to the carrier frequency; and the filter provided between the oscillator and the signal converter to reduce a spurious signal of a carrier wave. The cutoff frequency of the filter is adjusted by the controller.
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Citations
4 Claims
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1. An infrared transmitter for transmitting a signal via an infrared ray, the infrared transmitter comprising:
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a signal converter for converting the signal into an infrared signal; an oscillator for oscillating a carrier frequency of the infrared signal; a controller for adjusting a cutoff frequency of a filter according to the carrier frequency; and
the filter provided between the oscillator and the signal converter, the filter having the cutoff frequency adjusted by the controller,wherein the filter includes a variable capacitance diode so that the cutoff frequency is adjusted in a non-step manner as the controller adjusts a voltage applied to the variable capacitance diode, and the signal converter comprises an infrared light-emitting diode (IRLED). - View Dependent Claims (2, 3, 4)
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Specification