SONG INFORMATION AND DUAL OCTAMONIC FEATURES OF ITS SPECTRA IN THE CICADA Oncotympana maculaticollis Motschulsky
鸣鸣蝉(Oncotympana maculaticollis Motschulsk)自鸣声信息及其频谱的双倍频特征

In this paper, the information combinative structures of the long codes and the short codes and dual-octamonic features of the spectra of the calling songs of the cicada O. maculaticollis in the Lu-Mountain are mentioned.The songs of the cicada are repetitive "MUYING......MUYING MUA" andconsisted of three types of information MU (M), YING (I), and "A". Features of M are similar to those of A. both the durations are more than 170 ms, the periods of the signal waveforms about 6 ms, main peak frequency (MPF) of their spectra about 4 kHz, and the energy of the spectra distributed mainly in the frequency band 2-7 kHz. These are approximately unvarying features of the long codes of the calling songs of the cicada. Long code I differs from M and A on the duration which is more than 300 ms, MPF of long code I is changable between 2.7-7.2 kHz, and the energy well-distributed in frequency band 0-14 kHz. There are several pulse trains (PTS) of different frequencies in approximate 6 ms period, these PTS are called "short codes". It shows that long codes "I" among the calling songs of the cicada O. maculaticollis consist of the short codes of varying frequencies. The part spectra of M and A possess dual-octamonic features, i.e. sub-spectra peaks are both octamonic series. One series of resonant peak is the main peak, and the another is the second peak.