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고주파 성분의 발생을 목적으로 하는 오디오 신호 디스토션<SUB>Distortion</SUB>에 관하여: 기존 방법들의 체계화와 확장된 방법들의 소개
이상빈(Sangbin Patrick Rhie) 한국전자음악협회 2021 에밀레 Vol.19 No.-
There are variety of ways to distort audio signal which means to create certain system to add massive high-frequency noise to original signal. Well-known distortion methods of distortion include clipping, using transfer function of specific shape(like hyperbolic tangent, rational function, sigmoid function), sample & hold, signal rounding. Each method’s spectral result can be formalized by experiment giving sinewave as input and defined using some mathematic formulas. Then, extended method for distortion is being suggested and they are each called “Chorus with high-frequency modulator”, “Noisy identity transfer function method”, “Random value transfer function method”, “Signal-drilling method”. These methods can be classified into several categories such as making discontinuities in sample value(amplitude), keeping a constant sample value in time-domain for certain duration, ...etc.