Digital sound effects Echo and Reverb based on Non-Exponentially Decaying Comb Filter

This paper presents algorithms of two digital sound effects based on the NEDCF (Non-Exponentially Decaying Comb Filter). The first part of the paper deals with the description of a NEDCF structure and with the algorithm of the digital sound effect of Echo type with easily controllable parameters. The second part describes an extension of the previous algorithm for obtaining a new algorithm of the multi-channel digital reverberation. The reverberation algorithm presented in this paper produces an impulse response with a controllable decay curve, reverberation time and frequency dependent reverberation time. The decay curve can consist of an arbitrary number of increasing or decreasing linear segments which enable the creation of an interesting reverberation effect.