No guys,

I can't change my hardware.

BRUCE:
"From the bit timing you indicate, I would guess this is a Sony IR transmitter? PULSIN should
be all you need to decode this type. It's one of the easiest around to encode & decode."

It is a VISHAY TSOP4840 receiver (see mouser for the datasheet) and the emiter is a VISHAY TSAL6100 led. I'm using pic's PWM output to encode and I need to decode on the other side but do it quickly and acurately. I'm not using pulsin, I'm polling the input pin, what's wrong with that?