An Automatic Music Key Shifting System for Karaoke Machine
Date Issued
2008
Date
2008
Author(s)
Chang, Yuan-Chin
Abstract
Value-added services on multimedia system are becoming popular. The latest multimedia applications are transferring from different platforms to personal computers, including the Karaoke system. Moreover, newest MTV downloaded from internet relieves users from buying expensive and difficult-to-update Karaoke machines and from spending much money in KTV.An value-added service is proposed in the thesis, namely, an automatic key shifting system for Karaoke systems on PC. On all Karaoke platforms, we have to shift keys personally. Most untrained people do not know how to shift keys properly. Hence, we build the automatic key shifting system. Recording the voice and analyzing the pitch, we can shift the pitch of the accompany music to fit users’ gamut.In this thesis, the automatic pitch shifting function is made of two components: pitch tracking and pitch shifting. In general, pitch detectiion is performed efficiently in time domain. However, for this research, for better accuracy, pitch detectiion is implemented in frequency domain. itch shifting can also be carried out in time domain or frequency domain. After considering the acoustics effects and the tolerances of pitch shifting range, we use PV (Phase Vocoder) in frequency domain. We can get a better acoustics performance after shifting pitch within an octave. Besides, the shifting range is sufficient for general usage.
Subjects
Pitch
pitch scaling
pitch shifting
pitch tracking
pitch detecting
phase vocoder
mode
karaoke
Type
thesis
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