Pseudobipolar signal example - Analog Devices AD7682
A Pseudo Bipolar signal is just a bipolar signal with a non-zero voltage at which the signal is considered to have zero magnitude.  A "true" bipolar signal has 0V as the zero magnitude voltage.

Pseudo Bipolar allows you to use a positive reference voltage and voltage range at the ADC input and generate positive and negative output values, with respect to the reference voltage.  This saves having to use a bipolar power supply. 

You already have a plot of pseudo bipolar in your second reference.  It is just named slightly differently.  In this case, the zero magnitude voltage is 2.5V.