[Synchronous analysis of multi-channel spectrum for human resonance cavity]

The synchronous analysis of multichannel spectrum were used to determine the regulars, conditions and characters of the resonance when subjects pronounced. 140 subjects were selected for test and 1040 pieces of sound sample were collected, then the analysis of different parts (mouth, throat, head and chest) was done. The results of the analysis of variance showed that there was much difference among the various professional workers, different places of articulation, and patients with voice disorders in spectrum analysis (P < 0.001). Each part of resonance frequencies was put forward of pronouncing system. High frequency resonance comes from head and pharynx (above 2000 Hz high resonance cavity), and low frequency resonance comes from chest and larynx (less than 2000 Hz resonance cavity). We suggest that there are six degrees of clinical objective classification of the pathologic hoarseness.