Study on semiotics has a hot topic around the world, but it hesitates to be applied into computer-field, which would be a wonder if it has access to the speech recognition. Language is usually described as speech signal, which involves punctuation in sound with silence and speech. All these silence and speech sounds have characteristics in significant and signifié. The study on punctuation in China has been focused on word-based text, lacking in precise explanation of sound punctuation, which leading to our study on recognition in sound-based text. In this paper, we discuss the definition and characteristics of punctuation in script and sound with parameter analysis of wavelet transform, and therefore defines the critical nature of punctuation: stop in silence, trying to realize the recognition of punctuation in sound-text.