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公开(公告)号：US10481121B2
公开(公告)日：2019-11-19
申请号：US15904737
申请日：2018-02-26
发明人： Paul Wilson , Karthikeya Kodur
摘要： This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (CMEMS) such as a microphones. An amplifier apparatus (300) is arranged to amplify an input signal (VINP) received at a sense node (104) from the MEMS capacitive sensor. An antiphase signal generator (201; 304) generates a second signal (VINN) which is in antiphase with the input signal (VINP) and an amplifier arrangement (105; 305) is configured to receive the input signal (VINP) at a first input and the second signal (VINN) at a second input and to output corresponding amplified first and second output signals. This converts a single ended input signal effectively into a differential input signal.
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公开(公告)号：US20190253810A1
公开(公告)日：2019-08-15
申请号：US16343835
申请日：2017-10-25
CPC分类号： H04R19/04 , G06F13/42 , G06F13/4282 , H04R1/222 , H04R3/06 , Y02D10/14 , Y02D10/151
摘要： A method in a transducer assembly having an external-device interface coupled to a communication protocol interface of the transducer assembly. The transducer assembly is configured to convert an input signal having one physical form to an output signal having a different physical form. At least two electrical signals are received on corresponding contacts of the external-device interface of the transducer assembly. A characteristic of at least one of the electrical signals is determined by evaluating a logic transition of the signal. A unique identity assigned to the transducer assembly is determined based on the characteristic.
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公开(公告)号：US10382852B2
公开(公告)日：2019-08-13
申请号：US16021571
申请日：2018-06-28
发明人： Satoshi Yoshino
摘要： Provided is a condenser microphone circuit that can support variation in power supply voltage of a phantom power supply using a wiring system of two lines. A condenser microphone circuit includes a microphone unit, an FET, a constant current diode, a collector grounding first transistor that generates an operation power supply of the FET, a first resistor that sets base potential of the first transistor, a collector grounding second transistor that amplifies an output signal from the FET, a second resistor that sets base potential of the second transistor, and an output circuit. A base of the first transistor is connected to a source of the FET, an emitter of the first transistor is connected to a drain of the FET, a base of the second transistor is connected to the drain of the FET, an emitter of the second transistor is connected to the output circuit, and the second resistor divides voltage on a cathode side of the constant current diode.
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公开(公告)号：US10356525B2
公开(公告)日：2019-07-16
申请号：US16085052
申请日：2017-03-13
申请人： TDK Corporation
发明人： Gino Rocca
摘要： A method for calibrating a microphone that includes a transducer element and an ASIC. The method includes calibrating the frequency characteristic of the ASIC such that the sensitivity (Smic(fLLF)) of the microphone at a predetermined cutoff frequency (fLLF) shows a predefined reduction (Δ) compared to the sensitivity (Smic(fstandard)) of the microphone at a standard frequency (fstandard). Another aspect of the present invention concerns a microphone.
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公开(公告)号：US10327072B2
公开(公告)日：2019-06-18
申请号：US15816099
申请日：2017-11-17
摘要： A phase correcting system for connection with a transducer. The phase correction may take place before amplifying the output of the transducer. The phase correction system comprises a circuit configured to low-pass filter an input and feed the output to the non-signal terminal of the transducer. This circuit may comprise a transconductance amplifier.
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公开(公告)号：US10244316B2
公开(公告)日：2019-03-26
申请号：US15728045
申请日：2017-10-09
发明人： Stefan Barzen
摘要： According to an embodiment, a method of operating a speaker with an acoustic pump includes generating a carrier signal having a first frequency by exciting the acoustic pump at the first frequency and generating an acoustic signal having a second frequency by adjusting the carrier signal. In such embodiments, the first frequency is outside an audible frequency range and the second frequency is inside the audible frequency range. Adjusting the carrier signal includes performing adjustments to the carrier signal at the second frequency. Other embodiments include corresponding systems and apparatus, each configured to perform corresponding embodiment methods.
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公开(公告)号：US10070222B1
公开(公告)日：2018-09-04
申请号：US15471502
申请日：2017-03-28
申请人： Akustica, Inc. , Robert Bosch GmbH
发明人： Saikrishna Ganta , Chinwuba Ezekwe
摘要： A microphone biasing circuit comprises a first amplifier having an output connected to a first node and an input connected to a second node; and a first feedback path connected from the first node to the second node. The first feedback path comprises a microphone having a first terminal connected to the first node and a second terminal connected to a third node, the microphone being configured to provide a sensed voltage at the first node in response to sound, the third node having a first DC bias voltage; and a first capacitor connected between the third node and the second node.
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18.发明申请公开(公告)号：US20180103326A1
公开(公告)日：2018-04-12
申请号：US15840501
申请日：2017-12-13
发明人： Marco VENERI , Alessandro Morcelli
摘要： Described herein is a MEMS acoustic transducer device provided with a micromechanical detection structure that detects acoustic-pressure waves and supplies a transduced electrical quantity, and with an integrated circuit operatively coupled to the micromechanical detection structure and having a reading module that generates at output an audio signal as a function of the transduced electrical quantity. The integrated circuit is further provided with a recognition module, which recognizes a of sound activity event associated to the transduced electrical quantity. The MEMS acoustic transducer has an output that supplies at output a data signal that carries information regarding recognition of the sound activity event.
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公开(公告)号：US09843867B2
公开(公告)日：2017-12-12
申请号：US15149113
申请日：2016-05-07
CPC分类号： H04R17/10 , H04R1/083 , H04R1/326 , H04R3/06 , H04R2217/03
摘要： The present invention relates to a microphone with a specific audible area using ultrasound wave, which emits an ultrasound wave toward a sound source positioned in a specific area within a desired distance and a desired direction from the microphone, and extracts a sound signal in an audible frequency range, generated by the sound source, from an ultrasound wave reflected and received from the sound source. The microphone with a specific audible area using ultrasound wave can limit the audible area to an area within a specific angle from a half line starting from the microphone and a specific distance from the microphone, such that a user can selectively hear a desired sound in a noisy environment. When the microphone is applied to a hearing aid, the user can hear only the audible sound generated by the sound source located within the specific audible area in front of the user with the surrounding noise removed.
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公开(公告)号：US20170284825A1
公开(公告)日：2017-10-05
申请号：US15628057
申请日：2017-06-20
IPC分类号： H04R3/06 , G01D5/24 , G01D5/244 , G01P15/125 , H03M1/06 , H03M3/00 , H04R19/00 , H04R19/04 , G01D3/02 , G01P15/08 , H03M1/12 , H04R29/00
CPC分类号： H04R3/06 , G01D3/02 , G01D5/24 , G01D5/24476 , G01P15/125 , G01P2015/0865 , H03M1/0609 , H03M1/12 , H03M3/352 , H03M3/458 , H04R19/005 , H04R19/04 , H04R29/004 , H04R2201/003 , H04R2499/11
摘要： This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path. The monitoring may be performed in an analogue or a digital part of the signal path and in either case the modification may be applied in an analogue or a digital part of the signal path.
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