Method and device for realizing audio pitch shifting

Abstract

The invention provides a method and a device for realizing audio pitch shifting. The method comprises the following steps of: determining a pitch shifting factor alpha according to a received pitch shifting mode d and a numerator q and a denominator p after the pitch shifting factor alpha is expressed in the form of a fraction; for each audio signal input frame X, performing re-sampling and filtering on time domain on the audio signal input frame X based on q and p; judging an unvoiced sound and a voiced sound for the re-sampled and filtered audio signal input frame X and determining the pitch period of the re-sampled and filtered audio signal input frame X; determining whether the tone needs to be raised or fell according to the pitch shifting mode d; if the tone needs to be raised, performing data replication on the re-sampled and filtered audio signal input frame X with the pitch period as a unit based on the judgment results of the unvoiced sound and the voiced sound; and if the tone needs to be fell, performing data deletion on the re-sampled and filtered audio signal input frame X with the pitch period as a unit based on the judgment results of the unvoiced sound and the voiced sound. By using the scheme of the invention, the raising or falling of the tone can be effectively realized.

Description

technical field

[0001] The present invention relates to the technical field of audio processing, in particular to a method and device for realizing audio modulation. Background technique

[0002] As we all know, the basic elements of sound are: pitch, pitch and timbre. Audio pitch shifting refers to changing the pitch of the sound, raising or lowering the pitch while keeping the playing time of the audio signal unchanged. Audio tone shifting can change the characteristics of the sound. It is a popular technology in audio processing. It has a wide range of applications in many aspects, such as music synthesis, dubbing, online video chat, and confidential phone calls. One of the typical applications is It belongs to a karaoke machine, and its accompaniment system can use audio tone shifting technology to adjust the tone of the accompaniment music to suit the singer's voice. It can be predicted that with the rapid development of Internet and multimedia technology, there will ...

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