US 12,218,643 B2
Low latency audio filterbank having improved frequency resolution
David S. McGrath, San Francisco, CA (US)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 17/617,262
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Jun. 25, 2020, PCT No. PCT/US2020/039472
§ 371(c)(1), (2) Date Dec. 7, 2021,
PCT Pub. No. WO2020/264064, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 63/028,966, filed on May 22, 2020.
Claims priority of provisional application 62/866,823, filed on Jun. 26, 2019.
Prior Publication US 2022/0231669 A1, Jul. 21, 2022
Int. Cl. H03H 17/02 (2006.01); G10L 19/008 (2013.01)
CPC H03H 17/0267 (2013.01) [G10L 19/008 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of audio processing, the method comprising:
generating a plurality of modified impulse responses from a plurality of original impulse responses, wherein the plurality of original impulse responses respectively correspond to a plurality of frequencies, wherein generating the plurality of modified impulse responses includes:
performing a fade operation and a time reverse operation on at least one of the plurality of original impulse responses;
generating a pre-ripple response based on a first original impulse response;
generating a post-ripple response based on the pre-ripple response; and
adding the post-ripple response to the first original impulse response, and subtracting the pre-ripple response from the first original impulse response, to generate a first modified impulse response; and
filtering an input signal with the plurality of modified impulse responses to generate an output signal.