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...

AI Technical Summary

Problems solved by technology

Such a system can go out of scale, causing e.g. a karaoke singer's vowel to match the wrong part of the guide's target singing

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