Smart antenna interface using only digital I/O supporting both mode A and mode B antenna operation as per CEA 909 standard using a single digital counter

摘要

This invention samples and transmits the CEA-909 standard smart antenna analog pulse train waveforms using only a digital I/O pin for both mode A and mode B operation. This invention implements the smart antenna interface based on a single digital programmable counter. This counter is programmable so that it can tolerate or produce wide variation of symbol width.