竹鸡鸣声特征分析

本文用计算机鸣声分析技术，从时域、频域和短时能量等方面对杭州地区竹鸡早春的鸣声特征进行了分析.竹鸡鸣叫一般有5-11声，每声均为3个音节，各声的时域波形和功率谱特性均不相同.开始鸣声短促，往后持续时间逐渐延长，末声是第1声的1. 82倍，主要是各音节之间的间隔时间和第，音节的持续时间逐次延长，而第I和第1音节的持续时间逐渐缩短.同时，相同音节的BS的MPF渐次降低，第I、I音节分别降低了33%和40%.随着声序的增加，各音节的Bw渐次变窄.从各音节的前48ms声段分析可知，三个音节的RA变化各不相同，SS。的RA渐趋升高，SS:的RA在第4,5声最高，}3的RA在第7,8声最高.每声的短时能量分布也不同，前几声各音节都有较高的能量，后来第，音节能量逐渐降低，第，音节能量渐渐后移.整个鸣叫过程中，纯音平均约占7100,频率变化范围约在1500-3120H:之间

Studies on the Characteristics of Calling Sound of Bamboo-Partridge

The characteristics of calling sound of Bumbusicola thoracica in early spring in Hangzhou area was studied on the time-wave,power spectra and EN using computer analysis techniques.The results showed that the song of this bird generally had 5-11 calling sound consisting of 3 sllables,and there were di fferences of the characteristics of the time-wave and power spectra between sounds.At the beginning of the song,the duration of the sound was short,then it gradually became longer as time went on because of the increasing of the intervals between syllables and the duration of the third sound and the decreasing of the duration of the first and second syllables.The duration of the last sound was 1.82 times longer than the first one.In the same syllables,the MPF of BS was gradually reduced 33% in the first syllable and 40% in the second syllable,and the BW became narrower in each syllable.From the analysis of the massage of the first 48ms sound sect(SS) in each syllable,we could know that the variations of RA were different among the three syllables. Taking SS1 (first syllable SS) for example.the RA was increased progressively from the first to the last sound,and the highest RA was in the 4th and the 5th sound in SS2 and in the 7th and the 8th sound in SS3. The distribution of En was also dissimilar in different sounds,the value of En was high in every syllable at the first four sounds.In the other sounds,however,the value of En was decreased in the second syllable and the time occurring highest value of En was gradually delayed in the third syllable.From the whole process of the song,the pure whistles were about 71% in the sound and the range of frequence was about 1055-3120 Hz,so the sound of this bird was a typical sound of birds living in the shrub below the canopy in forest.