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Fast Harmonic Synthesis Method for Sinusoidal Speech-Audio Model  

Kim, Gyu-Jin (Department of Radio Engineering, Chungbuk National University)
Kim, Jong-Hark (Department of Radio Engineering, Chungbuk National University)
Jung, Gyu-Hyeok (Department of Radio Engineering, Chungbuk National University)
Lee, In-Sung (Department of Radio Engineering, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.44, no.4, 2007 , pp. 109-116 More about this Journal
Abstract
Most harmonic synthesis methods using phase information employ a quadratic or cubic phase interpolation. The methods are computationally expensive to implement because every component sinewave must be synthesized on a per sample basis. In this paper, we propose a fast harmonic synthesis method for sinusoidal speech/audio coding based on the quadratic and cubic phase function to overcome the complexity problem. To derive the fast harmonic synthesis method, we define the over-sampling function and phase modulation function by constraining the parameter of phase function to be independent for harmonic index and derive the fast synthesis method using IFFT. Experimental results show that the proposed method significantly reduce the complexity of conventional cosine synthesis method while maintaining the performance.
Keywords
cubic phase; interpolation; inverse fast fourier transform(IFFT);
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