US 12,342,139 B2
Increasing low frequency extension for microspeakers using a volume dependent linkwitz transform and multiband compressor
Eric Middleton, Redmond, WA (US); Kevin Venalainen, Redmond, WA (US); and Christopher Borowski, Seattle, WA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Appl. No. 17/928,303
Filed by Microsoft Technology Licensing, LLC
PCT Filed May 21, 2021, PCT No. PCT/US2021/033591
§ 371(c)(1), (2) Date Nov. 29, 2022,
PCT Pub. No. WO2021/247252, PCT Pub. Date Dec. 9, 2021.
Claims priority of application No. 2025740 (NL), filed on Jun. 3, 2020.
Prior Publication US 2023/0209257 A1, Jun. 29, 2023
Int. Cl. H04R 3/04 (2006.01); H04R 1/02 (2006.01); H04R 29/00 (2006.01)
CPC H04R 3/04 (2013.01) [H04R 1/025 (2013.01); H04R 29/001 (2013.01); H04R 2430/01 (2013.01); H04R 2430/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A data processing system comprising:
a speaker disposed in a sealed enclosure;
a processor; and
a computer-readable medium storing executable instructions for causing the processor to perform operations comprising:
obtaining a first input signal to be output by the speaker;
determining a first volume level associated with the first input signal;
selecting a first Linkwitz Transform and a first multiband compressor from volume-dependent configuration data based on the first volume level;
generating a first intermediate signal by applying the first Linkwitz Transform to the first input signal to increase a low-frequency response of the speaker;
determining that at least a portion of the first intermediate signal exceeds a signal threshold of the speaker;
generating a first output signal by applying the first multiband compressor to the first intermediate signal by compressing the at least a portion of the first intermediate signal that exceeds the signal threshold of the speaker; and
driving the speaker to produce first audio output using the first output signal.