ISSN(Online): 2319 - 8753 ISSN (Print) :2347 - 6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 2, February 2015 Copyright to IJIRSET DOI: 10.15680/IJIRSET.2015.0402067 571 Effect of Voice Part on the Quality of Children Speech in Dogri Language Varun Sharma 1 , Padmini Rajput 2 , Randhir Singh 3 , Parveen Lehana 4 M.Tech Student, Department of Electronics and Communication, Sri Sai College of Engineering, Punjab, India 1 Associate Professor, Department of Electronics and Communication, Sri Sai College of Engineering, Punjab, India 3 PhD. Scholar, Department of Physics & Electronics, University of Jammu, Jammu, India 2 Associate Professor, Department of Physics & Electronics, University of Jammu, Jammu, India 4 ABSTRACT: Speech is the most innate and fastest means of communication between humans. Computers with the ability to understand speech and speak with a human like voice are expected to contribute to the development of more natural man-machine interface. For the analysis of speech signal we have carried out the recording of six children speakers (3 male and 3 female) in Dogri language between the age group of 3-6 years. Harmonic plus noise model HNM has been employed as the analysis-synthesis platform as it outperforms almost all models of speech production in terms of important characteristics like naturalness, intelligibility, and pleasantness. PESQ method is used for evaluation of the quality of the speech synthesized from HNM. Mean and standard deviation (SD) is estimated for original and synthesized speech. Effect of different proportion of voice part on the quality and intelligibility of speech signal of children has been investigated at different levels of noise keeping noise part constant. Results suggest that the quality is quite poor at lower levels of voice part but increases gradually until the value of voice part is 50%. However as the voice percentage is increased the quality remains constant afterwards (till v100%). Results suggest that the percentage of voice part plays an important part for the quality of speech. With no voice part the quality is quite poor. Further the results prove that HNM is an excellent model for children speech. Also the worst and best speech quality is not same for male and female children speakers. KEYWORDS: Speech processing, HNM, PESQ. I. INTRODUCTION Speech generation is one of the most important areas of research in speech signal processing which is now gaining a serious attention. The attributes of speech signal are so fascinating that we rarely pause to define it. Speech is the most natural kind of communication different forms of information to the listener. Among them, the content of the message is most important nevertheless, other information like the emotion, gender and identity of speaker is also an essential part in the oral swap over of communication [1]. Figure 1 shows the different parts of human articulatory system. The speech signal is generated from human articulatory system and perceived through ears. Speech is a natural form of communication in human beings and seems as natural to humans as walking, and only less so than breathing [2]. Brain arranges thoughts into sequence of words for articulation. The indistinguishable units that constitute words are called phonemes. The pronunciation of phonemes depends upon contextual effects, speaker characteristics and emotions [3]. Human speech is dynamic rather than static, as the articulators keep moving during articulation this fact leads to an assumption that we begin to articulate the next segment before completing the previous one [4]. Speech signal processing has many efficient and intelligent applications, like speech recognition, speaker transformation and text-to- speech (TTS) systems [6].