Language Identification is one of important speech processing techniques to identify the language of unknown utterance of speech. It is used in several applications like multilingual system, IVRS etc systems in which speech utterances play prominent role. In this book, we explained objectives, challenges of the system and the different phases involved in the system. This book clearly explains important feature vectors and extraction techniques to implement LID. It also explains about variuos statistical approaches like vector quantization, Hidden Markov model and Gaussian Mixture models to...