SPL MRPP PhaVoRIT Traktor Pitch'n Time MPEX-2 mean score 5,5573 5,7704 6,4262 6,2622 6,4590 2,3278 std. deviation 3,0029 2,6101 1,8926 2,5684 2,5597 2,1191 per-song mean values comments Lovesong 1,7 2 7,7 8,2 7 5,1 rapid transients Smooth Sailing 4,3 4,8 4,8 9 8,1 1,6 sharp transients Radetzky March 8,4545 8,3636 6,1818 4,7272 4,1818 1,7272 dense arrangement Narcotic 6 6,1 6,7 6 7,2 1,3 duet vocals Poison 4,2 5,2 6,6 6,2 7,4 3 noisy characteristic Kl. Nachtmusik 8,4 7,9 6,6 3,6 5,1 1,3 no transients Table 2: List of the mean grades for each algorithm. Grades are from 1 (worst) to 10 (best). Maestro! interactive conducting exhibit. The audio quality of PhaVoRIT was assessed in a formal user listening test and has been found to be comparable to some of the best commercially available time-stretching systems. References Auger, F. and P. Flandrin (1995, May). Improving the readablility of time-frequency and time-scale representations by the reassignment method. In IEEE Transactions on Signal Processing, Volume 43, pp. 1068-89. Bernsee, S. M. (2005, June). The DSP dimension. Bonada, J. (2000). Automatic technique in frequency domain for near-lossless time-scale modification of audio. In Proceedings of International Computer Music Conference. Borchers, J., E. Lee, W. Samminger, and M. Mtihlhduser (2004, March). Personal orchestra: A real-time audio/video system for interactive conducting. ACM Multimedia Systems Journal Special Issue on Multimedia Software Engineering 9(5), 458-465. Dolson, M. (1986). The phase vocoder: A tutorial. Computer Music Journal 1(4), 14-27. Duxbury, C., M. Davies, and M. Sandler (2001, December). Separation of transient information in musical audio using multiresolution analysis techniques. In Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-01), Limerick, Ireland. Flanagan, J. L. and R. M. Golden (1966, November). Phase vocoder. The Bell System Technical Journal 45, 1493-1509. Garas, J. and P. C. Sommen (1998). Time/pitch scaling using the constant-Q phase vocoder. In Proceedings of STW's 1998 workshops CSSP98 and SAFE98, pp. 173-176. Hammer, F. (2001). Time-scale modification using the phase vocoder. Master's thesis, Institute for Electronic Music and Acoustics (JEM), Graz University of Music and Dramatic Arts. Karrer, T. (2005). Phavorit - a phase vocoder for real-time interactive time-stretching. Master's thesis, RWTH Aachen University. Laroche, J. and M. Dolson (1997). Phase vocoder: About this phasiness business. In Proceedings of IEEE ASSP Workshop on application of signal processing to audio and acoustics, New Paltz, NY. Laroche, J. and M. Dolson (1999, May). Improved phase vocoder time-scale modification of audio. In IEEE Transactions on Speech and Audio Processing, Volume 7, pp. 323-332. Lee, E., T. Karrer, and J. Borchers (2006). Towards a framework for interactive systems to conduct digital audio and video streams. Computer Music Journal 30(1). To appear. Lee, E., H. Kiel, S. Dedenbach, I. Gruell, T. Karrer, M. Wolf, and J. Borchers (2006, April). iSymphony: An adaptive interactive orchestral conducting system for conducting digital audio and video streams. In Extended Abstracts of CHI 2006 Conference on Human Factors in Computing Systems, Montr6al, Canada. ACM Press. Lee, E., T. M. Nakra, and J. Borchers (2004, June). You're the conductor: A realistic interactive conducting system for children. In NIME 2004 International Conference on New Interfaces for Musical Expression, Hamamatsu, Japan, pp. 68-73. Levine, S. N. and J. 0. Smith III(1998). A sines+transients+noise audio representation for data compression and time/pitch scale modications. In 105th Audio Engineering Society Convention, San Francisco. Masri, P. (1996). Computer Modelling of Sound for Transformation and Synthesis of Musical Signals. Ph. D. thesis, University of Bristol. Masri, P. and A. Bateman (1996). Improved modelling of attack transients in music analysis-resynthesis. In Proceedings of the International Computer Music Conference. McAulay, R. J. and T. F. Quatieri (1986, August). Speech analysis/synthesis based on a sinusoidal representation. In IEEE Transactions on Acoustics, Speech, and Signal Processing, Volume 34, pp. 744-754. Puckette, M. (1995). Phase-locked vocoder. In IEEE ASSP Conference on Applications of Signal Processing to Audio and Acoustics, Mohonk, New York. Ribel, A. (2003). Transient detection and preservation in the phase vocoder. In Proceedings of the Int. Computer Music Conference (ICMC'03), Singapore, pp. 247-250. 715
Top of page Top of page