Patent ID: 11935555
Assignee: DOLBY INTERNATIONAL AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A method, performed by an audio processing device, for generating a synthesis subband signal that is associated with a frequency band of a signal which is time stretched and/or frequency transposed with respect to an input audio signal, the method comprising:
providing an analysis subband signal which is associated with a frequency band of the input audio signal; wherein the analysis subband signal comprises a plurality of complex valued analysis samples at different times, each having a phase and a magnitude;
deriving a frame of L input samples from the plurality of complex valued analysis samples; the frame length L being greater than one;
applying a block hop size of p samples to the plurality of complex valued analysis samples, prior to deriving a next frame of L input samples; thereby generating a suite of frames of input samples;
determining a frame of processed samples from a frame of input samples, by determining for each processed sample of the frame:
the phase of the processed sample based on a sum of the phase of the corresponding input sample and the phase of a predetermined input sample scaled by an integer phase modification factor; and
the magnitude of the processed sample based on the magnitude of the corresponding input sample and the magnitude of the predetermined input sample; and

determining the synthesis subband signal by overlapping and adding the samples of a suite of frames of processed samples, wherein one or more of providing an analysis subband signal, deriving a frame, applying a block hop size, determining a frame of processed sample, and determining the synthesis subband signal is implemented, at least in part, by one or more hardware devices.