As you know OpenCV is a big great open-source library for image recognition and machine vision(and may further purposes like computer graphics, etc).
Is there similar library in sound field(Voice recognition/ NLP(Natural Language Processing))?
I know espeak for TTS, also pocketsphinx for voice recognition. Also there is something like ChatScript that I don't know if I can consider as a NLP engine or not? But I like to know did I mentioned the Best libraries for each part of sound/voice field or there are better options to learn and work with them?
Also will happy to hear some suggestions about best book(s) to read to learn the concepts/algorithms of ASR/NLP.