The modulation input (I/P) allows control of whether or not the infrared sender is on, and a digital output (O/P) indicates whether or not a pulse train is detected ... first part of this article how ...

Raytheon Co., Tucson, Ariz., is being awarded an $8,761,875 modification to a previously awarded firm-fixed-price contract for the replacement of the Pulse Code Modulation (PCM) Encoder due to ...