An Experimental Study On The Stop Sound In Linhai Dialect Of Wu Language

According to the pronunciation method,the plosive initials of Linhai dialect are divided into three sets: voiceless unaspirated,voiceless aspirated and voiced plosive.This paper takes the three sets of plosive initials of Linhai dialect as the research object,synchronously recording the speech signal and voice signal,and conducts acoustic experiments and EGG signal analysis on the plosive initials located at the front and back of the speech stream respectively.Acoustic experiments mainly conduct statistical analysis by extracting parameters such as absolute holding time,relative holding time,and voiced start time to find out the classification criteria that have distinguishing meaning in Linhai dialect.While vocalizing,the voice signal is observed through the electronic glottis.By extracting and calculating the open quotient,speed quotient and fundamental frequency parameters,the vocalization types of different stops in Linhai dialect are studied.Combining the acoustic parameters and voice signal parameters of Linhai Dialect’s plosive,the basic overview of Linhai Dialect’s plosive initials is described.This article found through experiments:Acoustic experiment results found that:(1)When the same plosive initials are located at different positions,the duration of the resistance is significantly different,and the first character is obviously longer than the latter;when the plosive initials are located in the latter,the duration of the resistance can distinguish the clearness of the plosive initials.turbidity.(2)The difference between the relative holding duration is the best.First,the relative holding duration of the preceding character is significantly longer than that of the posterior character.Secondly,the relative holding duration can effectively distinguish clear and voiced stoppages regardless of whether the stop consonant is in the preceding character or the posterior character.(3)The VOT value and the relative VOT value cannot distinguish the position before and after the stop and the type of the stop.EGG signal analysis found that:(1)The open quotient value can distinguish the full-voiced and sub-voiced initials at the position of the preceding word,but cannot distinguish the fully voiced stop initials.From the starting point of the open quotient value,the difference between the three types of stopphones is very small whether they are in the front word position or the back word position.(2)The speed quotient is not very useful in distinguishing between the three types of plosive initials,regardless of the position of the preceding or following characters.The velocity quotient of the position of the preceding characters of the same plosive initial is significantly smaller than the latter.From the change trend of the speed quotient of the following vowels,there are slight differences between different stops.(3)The fundamental frequency value distinguishes better.When the three types of stop initials are located in the first word,the fundamental frequency value can effectively distinguish fully voiced stop sounds;when the three types of stop initials are located in the second word,there is no significant difference between the three types of stop initials.There is a significant difference in the positions of the first and last characters of the same stop consonant,and the fundamental frequency of the first characters is relatively low.From the perspective of change trend,the stable full voiced stop of the three types of stops followed by the vowel fundamental frequency are significantly lower than the full-voiced and sub-voiced stops.Based on the above analysis results,this article believes that voiced plosive of Linhai dialect are in the process of clearing,but at the same time they still retain some of the characteristics of voiced plosive,and the phonetic features are closer to the northern Wu dialect.When distinguishing the types of stop sounds in Linhai dialect,the state of oral muscle tension during the pronunciation can be used as a basis,and the relative holding duration can be used for effective distinction,and the fundamental frequency can also be used to assist the distinction.