Therapy of advanced cancer of the larynx includes excision of the entire larynx. After the removal of the larynx, the pharyngoesophageal segment (PES) is created by reconstruction of the soft tissue of the pharynx and oesophagus, and its vibration creates a replacement voice. High-speed video endoscopy (HSV) is the only method that visualizes and measures vibration of pharyngoesophageal mucosa (PEM) after laryngectomy. Acoustic characteristics of three forms of the rehabilitated voice of laryngectomized persons (oesophageal voice, tracheoesophageal voice using a speech prosthesis and electrolarynx) have been satisfactorily described but, the interdependence of acoustic and visual representations of the phonatory movement of the PES is still insufficiently investigated. In recent years, the development of biomechanical models is created to analyse the vibration of the PES, but still no uniform results have been achieved that would explain whether the parameters obtained from the analysis of the waveform of the PES can be compared with the parameters obtained from the acoustic analysis of the voice of a laryngectomized patients