Application of linear prediction coding and additive synthesis in computer music

Abstract

The contemporary computer technique gives a composer quite new possibilities for sound creation. The interference into the sound structure and modification of it, through the mediation of computer, allows one to obtain a new aesthetic value. The paper presents involvement of two methods of signal processing: additive synthesis and linear prediction coding, to obtain an amazing musical effect. Both of the methods were used in two stages: analysis and resynthesis. The stage of analysis allows for the description of a sound by a certain group of information about its structure. Modification of these parameters allows the changes to be made to the sound structure. Employing the analysis methods to the sounds they are not dedicated to may also give an effect of far sound structure modification. It may be given as an example analyzing nonharmonic sounds with a heterodyne filter, or lpc analysis of fast changing sounds. In these cases the sound structure modification results from loss of data during analysis. A wide range of possibilities of sound creation, made accessible by the contemporary computer technique, is a difficult challenge for imagination and a unique aesthetic of a composer.