Methods and apparatus for use in sound modification

Abstract

A digitised audio signal 310, such as an amateur's singing, and a digital guide audio signal 312 are supplied to a time alignment process 320 that produces a time-aligned new signal 330, time-aligned to the guide signal. Pitch along the time-aligned new signal 330 and along the guide signal 312 is measure in processes 340 and 345 which supply these measurement to a pitch adjustment calculator 370 which calculates a pitch correction factor C'(Fps) from these measurements and the nearest octave ratio of the signals. A pitch changing process 380 modulates the pitch of the time-aligned new signal 330 to produce a time-aligned and pitch adjusted new signal 390.

Description

technical field

[0001] The present invention relates to signal modification. More particularly, but not exclusively, the invention relates to problems arising in modifying a digitized sound signal based on features in other digitized sound signals, wherein corresponding features of a first sound signal and a second sound signal are in each Signals do not appear at the same relative position in time. Background technique

[0002] It is notoriously difficult to speak or sing along with audio or audio / video segments such that the new performance is exactly synchronized repetition of the original actor or singer's words. Therefore, it is very unlikely that the recording of a new performance will have its beginnings and details of the acoustic properties synchronized with the original audio track. Similarly, features such as a new singer's pitch may not change as precisely or as intricately as the original singer. There are many situations in the professional audio recording i...

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