IR remote control coding query

Checking the coding function of the r/c, not something I do very often. Manufacturer's original for controlling amp,tuner and CD but with 3 different receivers, one for each separate, from one IR controller.

The ident "pulse" code for all button presses, was always 101 then one bit that alternated 0 or 1 on each successive keypress , whether the same key or another one, then its inverse as a bit, then 011 then 18 bit function code that was always consistent for the same button. What was this alternating fourth/fifth bit all about? it was normal function by the way

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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N_Cook
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No numeric keypad on this R/C but presumably uses a GP chipset. So avoids say keypresses 123 being misinterpreted as 1123 if the signal is blocked while pressing the 1.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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N_Cook

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