Have you ever looked into JP1? Many One For All (and Radio Shack, in the States) universal remotes have a 6-pin connector in the battery compartment. If you build yourself a simple JP1 cable, you can hook these remotes up to your computer and re-program them. If the remote is a learning remote, you can use the learning feature to capture IR signals and see what they look like (without an oscilloscope).

I wasn't able to help you more with what you're trying to do because I don't understand your terminology (ie, what does "determine the BIT of the signals" mean)?

To undertand an IR signal, you need to know...
1) the frequency
2) the timings of the "1" and "0" burst pairs
3) the timings of the header pair and lead-out (if present)
4) the number of bits in the signal

Furthermore, to generate discrete codes, etc, you would need to determine...

5) the number of bits that form the "device code" and the bits that form the "command code"

NOTE: this "device code" is not the item that you call "device code". The code that you use to program a remote, such as VCR/1234 is a "setup code".

Rob