US 11,837,246 B2
Harmonic transposition in an audio coding method and system
Per Ekstrand, Saltsjobaden (SE); and Lars Villemoes, Järfälla (SE)
Assigned to DOLBY INTERNATIONAL AB, Dublin (IE)
Filed by DOLBY INTERNATIONAL AB, Dublin (IE)
Filed on Feb. 3, 2023, as Appl. No. 18/164,357.
Application 18/164,357 is a continuation of application No. 17/954,179, filed on Sep. 27, 2022, granted, now 11,594,234.
Application 17/954,179 is a continuation of application No. 17/409,592, filed on Aug. 23, 2021, granted, now 11,562,755, issued on Jan. 24, 2023.
Application 17/409,592 is a continuation of application No. 16/827,541, filed on Mar. 23, 2020, granted, now 11,100,937, issued on Aug. 24, 2021.
Application 16/827,541 is a continuation of application No. 16/027,519, filed on Jul. 5, 2018, granted, now 10,600,427, issued on Mar. 24, 2020.
Application 16/027,519 is a continuation of application No. 14/881,250, filed on Oct. 13, 2015, granted, now 10,043,526, issued on Aug. 7, 2018.
Application 14/881,250 is a continuation of application No. 12/881,821, filed on Sep. 14, 2010, granted, now 9,236,061, issued on Jan. 12, 2016.
Claims priority of provisional application 61/243,624, filed on Sep. 18, 2009.
Claims priority of application No. PCT/EP2010/053222 (WO), filed on Mar. 12, 2010.
Prior Publication US 2023/0197089 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/022 (2013.01); G10L 19/24 (2013.01); G10L 21/038 (2013.01); G10L 21/04 (2013.01); G10L 19/02 (2013.01)
CPC G10L 19/022 (2013.01) [G10L 19/0212 (2013.01); G10L 19/24 (2013.01); G10L 21/038 (2013.01); G10L 21/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An audio signal processing device for transposing an input audio signal by a transposition factor T to generate an output audio signal, the audio signal processing device comprising one or more components that:
extract a frame of L time-domain samples of the input audio signal using an analysis window of length L having the function

OG Complex Work Unit Math
convert the L time-domain samples into M complex frequency-domain coefficients;
alter a phase of the complex frequency-domain coefficients using the transposition factor T;
convert the altered frequency-domain coefficients into M altered time-domain samples; and
create a frame of L time-domain output samples of the output audio signal from the M altered time-domain samples using a synthesis window;
wherein M=F*L, with F being a frequency domain oversampling factor determined in response to frequency domain oversampling information received in an encoded bitstream; and
wherein the frame of L time-domain output samples of the output audio signal comprises a plurality of high frequency components not present in the frame of L time-domain samples of the input audio signal, at least one of the high frequency components is generated using the transposition factor T, and at least one other of the high frequency components is generated using a second transposition factor T2, wherein T is not equal to T2.