$ sudo apt-get update
$ sudo apt-get install pocketsphinx-hmm-en-tidigits 

pocketsphinx-hmm-en-tidigits is installed in your system.

Make ensure the pocketsphinx-hmm-en-tidigits package were installed using the commands given below,

$ sudo dpkg-query -l | grep pocketsphinx-hmm-en-tidigits *

You will get with pocketsphinx-hmm-en-tidigits package name, version, architecture and description in a table

pocketsphinx-hmm-en-tidigits package basic information: