A new approach is presented for the digital sound analysis-synthesis of musical tones. Based on the Source-Filter principle, the Extended Subtractive Synthesis roughly consists of the real-time filtering of a source signal by a digital filter. Starting from the recorded notes of a given instrument, the time-varying fundamental frequency and the digital filters are jointly analyzed. First, one key point of this work is the use of new advanced tools for the filter identification, which allow a relative low-order approximation of the spectral envelopes with a perceptually based criterion. Second, we propose a particular filter chain, for the separated sine and noise parts, which significantly reduces the simulation cost in the case of polyphonic synthesis and facilitates the time-varying filtering.
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