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

Claim 0:
1. An audio processing device including a subband processing unit configured to determine a synthesis subband signal from an analysis subband signal; wherein the analysis subband signal comprises a plurality of complex valued analysis samples at different times, each having a phase and a magnitude; wherein the analysis subband signal is associated with a frequency band of an input audio signal; wherein the subband processing unit comprises
a block extractor configured to repeatedly
derive a frame of L input samples from the plurality of complex valued analysis samples; the frame length L being greater than one; and
apply 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 L input samples;

a nonlinear frame processing unit configured to determine 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

an overlap and add unit configured to determine the synthesis subband signal by overlapping and adding the samples of a suite of frames of processed samples; wherein the synthesis subband signal is associated with a frequency band of a signal which is time stretched and/or frequency transposed with respect to the input audio signal.