Knowles has been granted a patent for a microphone device with an interface circuit that manages sensitivity differences in environmental stimuli detection. The circuit balances multiple electrical signals to produce a more accurate output. This innovation improves microphone performance and signal quality. GlobalData’s report on Knowles gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Knowles, was a key innovation area identified from patents. Knowles's grant share as of January 2024 was 47%. Grant share is based on the ratio of number of grants to total number of patents.

Balanced microphone device for managing sensitivity differences

Source: United States Patent and Trademark Office (USPTO). Credit: Knowles Corp

A recently granted patent (Publication Number: US11889252B2) discloses a microphone device with a unique sensor configuration and interface circuit. The sensor includes transduction elements that produce electrical signals 180 degrees out of phase, each with a different sensitivity to detected stimuli. An interface circuit with a bias voltage generator, amplifier circuit, and compensation circuit balances the difference in signal amplitudes. The compensation circuit includes a signal balancing amplifier to equalize sensitivity in the electrical signals produced by the sensor, ensuring accurate sound capture.

Furthermore, the patent also covers an interface circuit for sensors with transduction elements producing out-of-phase electrical signals. The interface circuit includes a bias voltage generator, amplifier circuit, and compensation circuit to balance signal amplitudes. The compensation circuit, which includes a signal balancing amplifier and a proportional integrating controller, detects and corrects any asymmetries in the differential output signal produced by the amplifier circuit. The interface circuit is designed to be part of a microphone device, with the sensor housed in a structure with a port for receiving stimuli. Additionally, the patent covers methods for producing and applying DC bias voltages to the sensor, detecting stimuli, producing a differential output signal, and applying a balance signal to the sensor to ensure accurate signal processing and sound capture.

To know more about GlobalData’s detailed insights on Knowles, buy the report here.

Premium Insights


The gold standard of business intelligence.

Blending expert knowledge with cutting-edge technology, GlobalData’s unrivalled proprietary data will enable you to decode what’s happening in your market. You can make better informed decisions and gain a future-proof advantage over your competitors.


GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.