Infrared receiver circuit for processing carrier-modulated infrared reception signal, has AND gate, negation unit, amplifier, mixer, filter and threshold element to generate output signal based on infrared and light reception signals

摘要

The receiver circuit (10A) has a demodulator (20) generating a digital pulse train signal from a carrier-modulated infrared reception signal amplified by a control amplifier (14) and filtered by a band pass filter (16). Another control amplifier (34) amplifies an ambient light reception signal. Another band pass filter (36) filters the amplified light reception signal. An AND gate (22), negation unit (24), differential amplifier, mixer, low-pass filter and a threshold element are used as a comparison circuit to generate an output signal (A) based on the infrared and light reception signals.