鸣鸣蝉(Oncotympana maculaticollis Motschulsk)自鸣声信息及其频谱的双倍频特征

SONG INFORMATION AND DUAL OCTAMONIC FEATURES OF ITS SPECTRA IN THE CICADA Oncotympana maculaticollis Motschulsky

本文报道庐山鸣鸣蝉自鸣声信息的长码与短码结构及其部分频谱的双倍频特征。庐山鸣鸣蝉多次重复的“MUYING……MUYING MU A”叫声,仅由三种信息MU(简称M),YING(I)及“A”重复编排而成。M与A的特征类似:持续时间大于170ms,波形具有约为6ms的周期,频谱主峰频率(MPF)约为4kHz,谱能量主要分布在2—7kHz频带内。这是鸣鸣蝉自鸣声长码的近似不变特征。长码I与M,A的不同点是持续期多在300ms以上,MPF为变频特征,在2.7—7.2kHz之间变化,谱能量较均匀地分布在0—14kHz频带内。约为6ms的准周期内含有几个频率不同的脉冲串(PT),这些不同频率的PT称为短码。这表明鸣鸣蝉自鸣声中长码是由变频短码组成的。M与A部分频谱具有双倍频特征,即构成频谱的子谱峰频率为两个倍频序列,其中一序列的共振峰为主峰,另一序列的共振峰为次峰。

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.