US 12,114,136 B2
Signal processing methods and systems for beam forming with microphone tolerance compensation
Dietmar Ruwisch, Berlin (DE)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Jan. 8, 2022, as Appl. No. 17/571,466.
Application 17/571,466 is a continuation of application No. PCT/EP2020/069617, filed on Jul. 10, 2020.
Claims priority of application No. 19185513 (EP), filed on Jul. 10, 2019.
Prior Publication US 2022/0132243 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 3/00 (2006.01); H04R 1/40 (2006.01); H04R 29/00 (2006.01)
CPC H04R 3/005 (2013.01) [H04R 1/406 (2013.01); H04R 29/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of microphone tolerance compensation when generating a directional output signal from sound received by at least two microphones arranged as microphone array, said method comprising:
transforming analog-to-digital converted time-domain signals provided by respective ones of said at least two microphones into corresponding complex-valued frequency-domain microphone signals, the analog-to-digital converted time-domain signals representing respective sounds received by said at least two microphones, wherein each one of the corresponding complex-valued frequency-domain microphone signals has a frequency component value for each frequency component of a plurality of frequency components;
calculating, for each frequency component of the plurality of frequency components of the complex-valued frequency-domain microphone signal of at least one microphone of said at least two microphones, a respective tolerance compensated frequency component value by multiplying the frequency component value of the complex-valued frequency-domain microphone signal of said at least one of said at least two microphones with a frequency-specific real-valued correction factor, resulting in tolerance compensated frequency component values, wherein the frequency-specific real-valued correction factor compensates for at least a sensitivity deviation relative to a reference microphone within the microphone array or a combination of reference microphones within the microphone array; and
forming a tolerance compensated complex-valued frequency-domain microphone signal from said tolerance compensated frequency component values for said plurality of frequency components.