In order to evaluate the results of voice and speech rehabilitation after total laryngectomy some acoustic parameters (fundamental frequency, waveform perturbation) were examined in 18 total laryngectomy patients. Eight of these subjects had previously been surgically rehabilitated with a trachealesophageal phonatory valve while 10 had been submitted to esophageal speech rehabilitation. Analysis of results has shown that trachealesophageal voices are more likely to provide a stable fundamental frequency; there is also a tendency toward more clearly defined harmonics; jitter and shimmer are more similar to the values of normal subjects compared with those observed in esophageal speech. Such results seem to depend on a more regular vibration pattern in the pharyngealesophageal segment, due to the more efficient expiratory flow in trachealesophageal speech. Moreover we were able to demonstrate a correlation between the objective parameters evaluated and the subjective score on speech acceptability.