Encoder Input Capture extension

[sjauhri]

Hi,
I'm using the CORE2 Board to control my wheels and have encoders that provide 3 phase signals i.e. each encoder has three signals.

Hence, I need to extend the encoder software to capture three inputs (as opposed to two ICs in the current software)

My queries are:

1. Are Input Capture filters and prescalers currently used? If so, what is their role? (I see IC1Filter = set to 0x0F and IC1Prescaler set to TIM_ICPSC_DIV4)
2. Is it sufficient to update the encoder class and the corresponding structs (TIM_Encoder_InitTypeDef) such that they use three input captures i.e. adding IC3 everywhere?