Method for improving die area and power efficiency in high dynamic range digital microphones
AssigneeInvenSense, Inc.
InventorsIgor Mucha, Michael Perrott
Life of this patent
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Abstract
Exemplary multipath digital microphones described herein can comprise exemplary embodiments of automatic gain control and multipath digital audio signal digital signal processing chains, which allow low power and die size to be achieved as described herein, while still providing a high DR digital microphone systems. Further non-limiting embodiments can facilitate switching between multipath digital audio signal digital signal processing chains while minimizing audible artifacts associated with either the change in the gain automatic gain control amplifiers switching between multipath digital audio signal digital signal processing chains.
Claims15
An apparatus, comprising:
- an automatic gain control (AGC) component configured to determine and adjust gain for each of a plurality of amplifiers based in part on a characteristic measurement of an associated input signal to at least one of the plurality of amplifiers;
- a gain and offset estimation component configured to estimate at least one of gain differences or offset differences between a plurality of filtered digital signals associated with the plurality of amplifiers;
- and
- a multipath digital signal combiner component configured to perform gain and offset correction for the plurality of filtered digital signals to provide a plurality of corrected digital signals based at least in part on the gain determined by the AGC component.
An apparatus, comprising:
- a gain and offset estimation component configured to estimate at least one of gain differences or offset differences between a plurality of filtered digital signals associated with a plurality of digital filters;
- a multipath digital signal combiner component configured to perform gain and offset correction for the plurality of filtered digital signals to provide a plurality of corrected digital signals, wherein the multipath digital signal combiner component is further configured to scale the plurality of filtered digital signals via a plurality of attenuation components to provide a plurality of scaled digital signals based at least in part on a gain determined by an automatic gain control (AGC) component and at least one of the plurality of attenuation components;
- and
- a multiplexing component configured to switch from conveying one of the plurality of corrected digital signals to conveying a second one of the plurality of corrected digital signals.
Dependencies are inferred from the claim text.