Reliable and automatic estimation of the Glottal Closure Instant (GCI), also referred to as epoch or pitch-event, has increasingly become an essential requirement in many speech processing applications, such as high-quality speech synthesis  and speech coding . Although several methods exist , GCI detection still remains a difficult task. In this paper a robust pitch-event detection algorithm based on the sinusoidal modelling of speech is proposed. The improvement in performance over other well-known epoch detectors demonstrates the powerfulness of the sinusoidal technique for GCI determination.
Bibliographic reference. Larreategui, M. L. / Ancin, F. J. / Carrasco, R. A. (1995): "An improved epoch detection algorithm based on sinusoidal modelling of speech", In EUROSPEECH-1995, 409-412.