Comparison of the Vocal Calls of Alexandrine and African Grey Species of Parrots using LPC Based Analysis Approach
Kamaljit Singh Arora1, Randhir Singh2, Parveen Lehana3
1Kamaljit Singh Arora, M. Tech student, Department, of Electronics And Communication Engineering, Sri Sai College of Engineering And Technology, Badhani, Pathankot, Punjab, India.
2Randhir Singh,  Assistant Professor & Head, Department, of Electronics and Communication Engineering, Sri Sai College Of Engineering And Technology, Badhani, Pathankot, Punjab, India.
3Parveen Lehana,  Associate Professor, Department, of Physics And Electronics, Jammu University, J&K, India.
Manuscript received on September 23, 2012. | Revised Manuscript received on October 16, 2012. | Manuscript published on October 30, 2012. | PP: 133-139 | Volume-2 Issue-1, October 2012.  | Retrieval Number: A0748102112/2012©BEIESP

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Abstract: Speech analysis is one of the interesting analytical approaches in the areas of digital signal processing and it has been explored for various research applications including modeling of speech signals, phonetics research, understanding the speech production mechanism, speech coding and speech recognition processes, etc. Birds are completely dependent on their vocal signals in order to fulfill their survival requirements like nesting, food, protection from any threat or danger and other mutual communicating activities, etc. Birds communicate with their vocal signals because they have a greater range of sounds than humans. Moreover, bird’s calls contain a lot of useful information, but it cannot be easily recognized by human ear as time and frequency resolution of our auditory system is limited. The basic mechanism of sound production in birds is almost similar to that of humans in many contexts. LPC model has been used as an efficient speech model for the analysis of human voice. So, it may be used for the analysis of bird’s vocal calls. This paper examines an investigating method for exploring the application of phonetics research on parrot’s vocal calls. LPC based analysis approach has been applied on the vocal calls of Alexandrine Parakeet Psittacula Eupatria and African Grey Psittacus Erithacus species of parrots and investigations have been successfully carried out for comparing the number of phonemes in the calls of both the species using line spectral frequencies (LSF) vectors and Euclidean distances. Line spectral frequencies can be used to encode speech spectral information more efficiently than other transmission parameters. A classical method, known as vector quantization has also used for performing efficient speech analysis.
Keywords: Speech analysis, Vocal calls, Linear predictive coding (LPC), Line spectral frequencies (LSF).