Help identifying encoding scheme for RF device
The encoded output from the PT2262 (and clones) has already been documented, including in (at least some versions of) the PT2262 datasheet.
Each PT2262 input can have 3 possible states - low (0), high (1), or floating (F) and each causes a different pair of pulses on the output:

0 = short, short
1 = long, long
F = short, long

A sync bit is a single short pulse followed by a long gap, at the end of the data.
This diagram, taken from page 7 of the datasheet above, shows those three pulse patterns:



You can see that:

short pulse is 4α &quot;on&quot;, 12α &quot;off&quot;
long pulse is 12α &quot;on&quot;, 4α &quot;off&quot;

where &quot;α&quot; is the internal clock cycle length, as set by external components to the encoder.
So your 12 symbol pattern:

is:
F F 0 0 F F F F 0 1 1 0 [sync]
for the pin order (at least on a PT2262):
A0, A1, A2, A3, A4, A5, A6/D5, A7/D4, A8/D3, A9/D2, A10/D1, A11/D0 [sync]
There is additional complexity e.g. if the decoder is a type which outputs &quot;data bits&quot;, then the last 4 or 6 symbols (depending on the decoder) which are sent by the encoder must be either &quot;0&quot; or &quot;1&quot;, so that the decoder can output those bits on its data pins - they must not be sent as &quot;F&quot; from the encoder. Also the encoder sends the full sequence (at least) 4 times.
More information is available at a couple of the sites I have bookmarked from previous work on this (I'm sure there are other useful sites too):
Detect And Zero Rightmost One - Wireless Remote Control PT2272 for Arduino
graznik.de - Reverse Engineering Remote Control Power Sockets - Part 1: Information gathering
(That datasheet also seems to have a mistake: It shows a &quot;0&quot; as just a single short pulse on page 9, but correctly shows it as two short pulses on page 7.)