Future studies should investigate RNN or other neural network-based language modeling techniques that are known to perform better than word n-gram LMs. Also, advanced acoustic modeling, through the use of timedelayed neural nets (TDNNs), long short-term memory neural nets (LSTMs), and the <cite>VGG nets</cite>, should also be explored as their performance has been mostly reported using MFB features, and the use of multi-view features can help further improve their performance.