Big companies like Apple, Google, Amazon, Microsoft are doing a remarkable job to improve the voice assistants. However, these Intelligent Personal Assistants (IPAs) currently are facing the problem in recognizing whispered speech. This project solves this problem to some extent using ML-based algorithms.
For more, you can read my blog "Machine Learning: Voice assistants can start responding to Whisper"
Also, you can refer my publication in MLSLP 2018 by google on this link.