Patent ID: 7295785

Claim:
A discharge lamp lighting apparatus comprising: a light-receiving portion which receives an infrared remote control signal transmitted using a carrier wave having a carrier wave frequency fc; an A/D converter which converts the infrared remote control signal received by the light-receiving portion into a digital signal by sampling at a frequency fs much higher than the carrier wave frequency fc of the infrared remote control signal; a digital filter having a function of receiving the digital signal output from the A/D converter and of transmitting a component of the carrier wave frequency fc; signal processing means for shaping a waveform of the component signal output from the digital filter; and a lighting control circuit which controls a discharge lamp having a tube diameter of not more than 25.5 mm in accordance with data from the signal processing means, on the condition that a minimum value of a discharge lamp lighting frequency is higher than an upper cutoff frequency of the digital filter.