US Patent 7295785 Receiver, electronic apparatus, and discharge lamp lighting apparatus

A receiver includes a light-receiving portion which receives an infrared remote control signal from a transmitter, an A/D converter which converts a signal received by the light-receiving portion into a digital signal at a frequency much higher than a carrier wave, and a digital filter having the band-pass function of a pass band containing the carrier band of the infrared remote control signal for the digital signal output from the A/D converter. The digital filter reduces the influence of variations in argon spectrum intensity over time.