| 摘要 |
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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