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A Modified Additive Synthesis Method Using Source-Filter Model

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A modified additive synthesis method using a combination of additive synthesis and source filter modeling has been proposed for musical instruments. When applied to a trumpet, the results are perceived as being less synthetic than additive synthesis by itself. Since harmonics as well as inharmonics are important for resynthesized sound quality, the authors segment the frequency range into bands each of which contains a single harmonic with inharmonics. A sinusoidal model is not sufficient to represent both harmonics and inharmonics. A more complex model of a quasipolynomial in each of the frequency bands is proposed. The quasipolynomial can be obtained as the response of a special linear filter to the unit impulse. Thus each harmonic is obtained using a source-filter model. The inputs of this filter are periodic pulses with time-varying amplitudes and slightly varying periods. Two listening tests were performed to evaluate the perceived quality.

JAES Volume 63 Issue 6 pp. 443-450; June 2015
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AES - Audio Engineering Society