A system, a method and a computer-readable medium are disclosed for generating an infrared code from an envelope waveform of an infrared signal on a computing device. An envelope waveform is created by reflections of the original infrared signal between the emitter of the infrared signal and the receiver of the computing device. The computing device generates an intermediate signal from the received IR signal and then determines a digital envelope waveform from the intermediate signal. The computing device queries a database storing known pairs of digital envelope waveforms and IR codes and receives an IR code.