A Subtractive Synthesis of Khlui Sound using Asymmetrical Triangle Waveform Excitation Signal and Multi-Factor Warped Filters

Abstract

This article provides an approach to determine synthesis parameters to be used to synthesize khlui-phiang-aw sound. An alternative excitation signal, namely the asymmetrical triangle waveform was proposed. The subtractive filter was designed in the warped frequency domain and was dewarped before use. The warping factors used were depended on the pitch frequencies. Subtractive filters for different pitches requires different warping factors. An amount of wind noise was added to the filtered signal. The synthesis process ended with a lowpass filter that removed the high frequency content from the synthesis signal. The tasks described were implemented using Python and is available on a public repository.