What kind of IR detector and converter circuit could be used to down-convert an IR remote signal (in the neighborhood of 35 to 45 kHz) into audio frequency signals (0.1-20 kHz) of the appropriate level and drive to feed the mic input on a mobile phone TRRS headset jack for further analysis and decoding? Would something simply involving a divide-by-4 cascade of two D flops work? Or would decoder/(re)encoder chips or a microcontroller chip be necessary?