  It is well known that speaker identification yields very high performance in
a neutral talking environment, on the other hand, the performance has been
sharply declined in a shouted talking environment. This work aims at proposing,
implementing, and evaluating novel Third-Order Circular Suprasegmental Hidden
Markov Models (CSPHMM3s) to improve the low performance of text-independent
speaker identification in a shouted talking environment. CSPHMM3s possess
combined characteristics of: Circular Hidden Markov Models (CHMMs), Third-Order
Hidden Markov Models (HMM3s), and Suprasegmental Hidden Markov Models (SPHMMs).
Our results show that CSPHMM3s are superior to each of: First-Order
Left-to-Right Suprasegmental Hidden Markov Models (LTRSPHMM1s), Second-Order
Left-to-Right Suprasegmental Hidden Markov Models (LTRSPHMM2s), Third-Order
Left-to-Right Suprasegmental Hidden Markov Models (LTRSPHMM3s), First-Order
Circular Suprasegmental Hidden Markov Models (CSPHMM1s), and Second-Order
Circular Suprasegmental Hidden Markov Models (CSPHMM2s) in a shouted talking
environment. Using our collected speech database, average speaker
identification performance in a shouted talking environment based on
LTRSPHMM1s, LTRSPHMM2s, LTRSPHMM3s, CSPHMM1s, CSPHMM2s, and CSPHMM3s is 74.6%,
78.4%, 81.7%, 78.7%, 83.4%, and 85.8%, respectively. Speaker identification
performance that has been achieved based on CSPHMM3s is close to that attained
based on subjective assessment by human listeners.
