Computer assessment of tremolo feature in the context of evaluation of singing quality

Quality of singing is a subjective description of an impression received while listening to the singer. The features that can be related to the quality of singing are among others: intonation, vibrato, tremolo and timbre. This paper presents the results of the analysis of tremolo feature in the singing. The method presented here is developed to estimate the tremolo over singing samples. At the beginning the term of tremolo is defined and differences and similarities to other music terms, as vibrato and wobble, are described. Then the method developed to estimate the tremolo over singing samples is presented. Finally the authors try to find an answer to the question whether the tremolo feature is useful to evaluate the quality of singing.