Methods and apparatus for use in sound modification...

Music – Instruments – Electrical musical tone generation

Reexamination Certificate

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Reexamination Certificate

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07825321

ABSTRACT:
A digitised audio signal, such as an amateur's singing, and a digital guide audio signal are supplied to a time alignment process that produces a time-aligned new signal, time-aligned to the guide signal. Pitch along the time-aligned new signal and along the guide signal is measured in processes and which supply these measurement to a pitch adjustment calculator which calculates a pitch correction factor C's(Fps) from these measurements and the nearest octave ratio of the signals. A pitch changing process modulates the pitch of the time-aligned new signal to produce a time-aligned and pitch adjusted new signal.

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D.T. Chappell et al., “Speaker-Specific Pitch Contour Modeling and Modification,”Acoustics, Speech and Signal Processing—Proceedings of the 1998 IEEE International Conference on Seattle, WA, vol. 2, May 12-15, 1998, pp. 885-888.

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