encoded data

Hi ,

I am not sure if my question is relavent to this forum or not but its an interesting programing prblem that i am facing. I hope someone here would be able to give usefull advice on it.

my microcontroller is receiving a stream of data of 25bits. The stream is 0000011100000001000111000.

These bits are encoded strangely. A zero appears as follows,

(please ignore the dots, they are just there to hang the pattern.)

___
|...|
|...|
|...|
|...|________

The ratio of high-time to low-time is 1:3.

while one appears as follows:
________
|...........|
|...........|
|...........|
|...........|___

The ratio of high-time to low-time is 3:1.

My question is that what is this encoding scheme, and how can i read this in a microcontroller ?? I am receiving this stream on a normal pin which is not an interrupt pin.

I am looking for some neat algorithm to read the stream faithfully.

Any help would be great;

thankz & Bye
.