Patent ID: 11875814
Assignee: BIGO TECHNOLOGY PTE. LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The method of claim 3, wherein determining the phase shift amount of the current audio frame according to the variable-speed rate of the previous audio frame, the original phase signal of the previous audio frame and the target phase signal of the previous audio frame comprises:
determining a phase difference between the current audio frame and the previous audio
frame according to a phase difference calculation formula Δi=ζ+[φi−φi−1−ζ]2π, the original phase signal of the current audio frame and the original phase signal of the previous audio frame; and
determining the phase shift amount of the current audio frame according to a phase shift amount calculation formula θi=[ψi−1+ri−1Δi−φi]2π, the target phase signal of the previous audio frame, the variable-speed rate of the previous audio frame, the original phase signal of the current audio frame and the phase difference;
wherein θi denotes a phase shift amount of an i-th audio frame, Δi denotes a phase difference between the i-th audio frame and an (i−1)-th audio frame, φi denotes an original phase signal of the i-th audio frame, φi−1 denotes an original phase signal of the (i−1)-th audio frame, ζ denotes a set phase compensation constant, ψi−1 denotes a target phase signal of the (i−1)-th audio frame, ri−1 denotes a variable-speed rate of the (i−1)-th audio frame, and [.]2π denotes a modulo of 2π.