A high-quality real-time pitch-shifting algorithm by a time-varying factor for audio and m usical signals is presented. The pitch-shifting algorithm is based on the resam pling and tim e-scale modification m ethod. A new time-scale modification algorithm has been developed which is called the Normalized Filtered Correlation Time- Scale Modification (NFC-TSM) method. In order to modify the time-scale of the signal, some segments of the signal are repeated or discarded. The best splicing point is searched in the normalized low-pass filtered signal using the Average Magnitude Difference Function (AMDF). The new method is applicable to real-time pitch-shifting of musical signals with high-quality.

A manusript has been sent to the 10th Int. Conference on Digital Audio Effects (DAFx-07), Bordeaux, France, September 10-15, 2007 to be reviewed.

• Original. Original piano sound.
• Shifted + 15% - Cross-correlation. Shifted by 15% upwards. Splicing points searched by using the cross-correlation method.
• Shifted + 15% - Normalized - Cross-correlation. Shifted by 15% upwards. Splicing points searched by using the normalized cross-correlation method.
• Shifted + 15% - Normalized - AMDF. Shifted by 15% upwards. Splicing points searched by using the normalized AMDF (Average Magnitude Difference Function)) method.