Patent ID: 11882414
Assignee: NXP B.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The method of claim 1, wherein generating the reference signal includes repeating an N-samples segment, the generation of the N-samples segment comprising the steps of:
defining a set of frequency bins between a first and second ultrasound frequency;
defining a magnitude spectrum of length N/2+1, the magnitude spectrum comprising a plurality of active bins having a magnitude greater than zero and a plurality of zero-bins having a magnitude equal to zero;
converting the magnitude spectrum to a complex-valued spectrum by adding a phase value to each magnitude value of the active bins; and
generating the N-samples segment of the reference signal by applying an N-points inverse fast Fourier transform (iFFT) to the complex-valued spectrum.