Modified Spectral Modeling Synthesis Algorithm for Digital Piri

Transcription

1 Modified Spectral Modeling Synthesis Algorithm for Digital Piri Myeongsu Kang, Yeonwoo Hong, Sangjin Cho, Uipil Chong

2 6 > Abstract This paper describes a modified spectral modeling synthesis algorithm for digital Piri, which is a Korean woodwind instrument. The standard spectral modeling synthesis (SMS) considers the sound as a combination of deterministic and stochastic components and it usually takes long time to synthesize sounds and needs numerous parameters. In order to improve this drawback, it is necessary to modify the SMS. Thus, a novel approach for analysis, transformation and synthesis of the sound has been proposed. Moreover, it is possible to generate various sound duration flexibly using this modified SMS. Piri was a target to simulate the modified SMS. To synthesize sounds with the proposed method, it is firstly necessary to obtain a trimmed sound in the sustain region from the original Piri sound. Then, two parameter sets are required: a parameter set describing the characteristic of the Piri, such as deterministic frequencies, magnitudes and stochastic, and a parameter set including the window size, hop size and number of peaks. Finally, a flexible time scaling algorithm based on frame reallocation and interpolation technique is applied. Namely, the extracted parameters in the sustain region can be reallocated and interpolated to change the length of the synthesized sound with a real stretching factor. When synthesized sounds are compared with original sounds through their waveforms and spectra, the proposed method well synthesizes sounds which are similar to originals. The method is also applied successfully for other Korean instruments, Taepyeongso. Key words : Sound synthesis ( ), Spectral modeling ( ), Korean traditional woodwind instruments ( ), Time stretching algorithm ( ), Digital Piri ( )

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