Patent ID: 8406632
Filing Date: 2013-03-26
Classification: G08C,H04B

Abstract:
1. An infrared communications receiver for use with a display device including a light source, the receiver comprising: a light-receiving element for receiving an externally transmitted infrared signal and outputting a data signal; a determination portion for receiving a drive control signal including control information for driving the light source, and determining whether or not the light source is being driven by pulse width modulation drive based on the drive control signal; a frequency filter portion for which a threshold can be set, the frequency filter portion reducing an abrupt noise element in the data signal based on the threshold being set, the abrupt noise element being derived from infrared light from the light source, when the light source is determined as being driven by pulse width modulation drive by the determination portion; a control portion for setting the threshold for the frequency filter portion when the light source is determined as being driven by pulse width modulation drive by the determination portion; and a detection portion for detecting an occurrence frequency by counting the number of occurrences of the abrupt noise element included in the data signal outputted by the frequency filter portion, wherein, the control portion changes the threshold upon determination that the data signal is unreceivable based on the detected occurrence frequency for the abrupt noise element.