Inventor
JOHANNINGSMEIER NATHAN A
US17 patents
Patents
17 patentsUS9654863B2May 16, 2017
Main logic board with mounted speaker and integrated acoustic cavity
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US9967664B1May 8, 2018
Sensor assembly for measuring diaphragm displacement and temperature in a micro speaker
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US10283989B1May 7, 2019
Electrical power converter and detachable energy storage reservoir
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US8942410B2Jan 27, 2015
Magnetically biased electromagnet for audio applications
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US9263992B1Feb 16, 2016
Class D amplifier with variable switching frequency
APPLE INC9 citations79
US9231543B2Jan 5, 2016
Audio power amplification with reduced input power supply crest factor
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US9847713B2Dec 19, 2017
Charge pump-based split-rail supply generation
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US10254134B2Apr 9, 2019
Interference-insensitive capacitive displacement sensing
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US11455265B2Sep 27, 2022
Data bus driver with electrical energy dump
APPLE INC0 citations59
US10963410B2Mar 30, 2021
Data bus driver with electrical energy dump
APPLE INC0 citations59
US9332343B2May 3, 2016
Multi-channel audio system having a shared current sense element for estimating individual speaker impedances using test signals
APPLE INC0 citations51
US9247345B2Jan 26, 2016
Multi-channel audio system having a shared current sense element for estimating individual speaker impedances
APPLE INC1 citations51
US10212500B2Feb 19, 2019
Digital transducer circuit
APPLE INC0 citations50
US9729964B2Aug 8, 2017
Audio apparatus having dynamic ground break resistance
APPLE INC1 citations50
US10666209B2May 26, 2020
Increased output impedance switching amplifier and low-side recycle mode
APPLE INC0 citations45
US9699558B2Jul 4, 2017
Creation of sub-sample delays in digital audio
APPLE INC0 citations40
US10146732B2Dec 4, 2018
Time-division multiplexed data bus interface
APPLE INC0 citations36