Patent ID: 7457534

Claim:
An infrared communication system, comprising: a transmitter including, a modulator configured to modulate a first electric signal and configured to generate a second signal as a modulated signal, a first converter configured to convert the second signal into an infrared signal, and an infrared transmission section configured to transmit the infrared signal to the receiver; and a receiver including, a filter configured to restrain a plurality of rays having a spectrum whose peak is present at a predetermined wavelength emitted by a plasma display panel, a second converter configured to detect a received infrared signal in accordance with a sensitivity, said sensitivity corresponding to a bias voltage, and configured to convert the received infrared signal into a third electric signal, a demodulator configured to demodulate the third electric signal, and a light-reception-sensitivity controller configured to supply the second converter with said bias voltage, said bias voltage being a predetermined value that is lower than a maximum bias voltage corresponding to a maximum second converter sensitivity, and said bias voltage being set independently of the received infrared signal.