I'm trying to build a device that is able learn a command from a TV IR Remote and recognise when this command is sent to it. I've see that the most common protocols used are NEC and Philips and that the frequency may vary of some kHz depending on the manufacturer. I need a receiver that is compatible with most of TVs.
The problem is the frequency: I've see modules like the Vishay TSOP48XX series but they only work with a specified frequency (like 36 kHz, 38 kHz, 40 kHz). Is it possible use these receivers out of their frequency range of 1 or 2 kHz with accettable results?
If not, what's the best solution in order to receive commands from all TVs?