公开(公告)号：WO2020186265A1

公开(公告)日：2020-09-17

申请号：PCT/US2020/022973

申请日：2020-03-16

Applicant: VESPER TECHNOLOGIES INC.

Inventor： LITTRELL, Robert J.

IPC: G10L21/0216 ,  G10L15/28 ,  G10L15/22 ,  G10L25/51 ,  G10L21/0224 ,  G10L21/0208 ,  H04W52/02 ,  H04R17/02 ,  H04R3/00

Abstract: An acoustic device is described and includes an acoustic sensor element configured to sense acoustic energy and produce an output signal and a threshold detector circuit including a switch having an input coupled to the output of the acoustic sensor element to receive the output signal, a control port that receives a control signal, and first and second output ports, a first channel including an analog-to-digital converter that operates at a first power level a second analog-to-digital converter that operates at a second higher power level, relative to the first power level and a threshold level detector that receives an output from the first analog-to-digital converter to produce the control signal having a first state that causes the switch feed the output signal from the acoustic sensor element to the second analog-to-digital converter when the first digitized output signal meets a threshold criteria.

公开(公告)号：WO2016172431A1

公开(公告)日：2016-10-27

申请号：PCT/US2016/028770

申请日：2016-04-22

Applicant: VESPER TECHNOLOGIES INC.

Inventor： LITTRELL, Robert J.

IPC: H03H9/17 ,  G11B9/00 ,  H01L41/08

CPC classification number: H01L41/0838 ,  B81B3/0072 ,  B81B2201/0257 ,  B81B2203/0118 ,  B81C1/00666 ,  B81C2201/017 ,  C23C14/0641 ,  C23C14/14 ,  C23C14/34 ,  C23C14/542 ,  H01L41/04 ,  H01L41/083 ,  H01L41/1136 ,  H01L41/27 ,  H01L41/316 ,  H04R7/06 ,  H04R17/02 ,  H04R31/003

Abstract: A transducer includes a first piezoelectric layer; and a second piezoelectric layer that is above the first piezoelectric layer; wherein the second piezoelectric layer is a more compressive layer with an average stress that is less than or more compressive than an average stress of the first piezoelectric layer.

Abstract translation: 换能器包括第一压电层; 以及位于所述第一压电层上方的第二压电层; 其中所述第二压电层是平均应力小于或大于所述第一压电层的平均应力的压缩比的压缩层。

公开(公告)号：WO2021231642A1

公开(公告)日：2021-11-18

申请号：PCT/US2021/032081

申请日：2021-05-12

Applicant: VESPER TECHNOLOGIES, INC.

Inventor： ASCHIERI, Julian

IPC: H04R3/04 ,  H04R1/00 ,  H04R3/00 ,  H04R3/06 ,  H03F2200/03 ,  H03F3/183 ,  H04R17/02 ,  H04R19/04 ,  H04R2201/003 ,  H04R3/02

Abstract: A transducer system has a transducer configured to receive an incident signal and produce an output signal as a function of the incident signal. As known in the art, the output signal has a -3dB point. The transducer system also has circuitry operatively coupled with the transducer. The circuitry includes an amplifier with an output configured to produce an amplified signal as a function of the output signal. In addition, the circuitry further has a positive feedback loop and a negative feedback loop that both are electrically coupled between the transducer and the amplifier. The positive feedback loop is configured to move the -3dB point in a first frequency direction. Conversely, the negative feedback loop is configured to move the -3dB point in a second frequency direction. Preferably, the first and second frequency directions are different.

公开(公告)号：WO2020186260A1

公开(公告)日：2020-09-17

申请号：PCT/US2020/022932

申请日：2020-03-16

Applicant: VESPER TECHNOLOGIES INC.

Inventor： LITTRELL, Robert J. ,  CARFORE, Michael ,  XUE, Shuwan

IPC: H04R17/02 ,  H03G3/20 ,  H03G3/24 ,  H03G3/32 ,  H04R17/00 ,  H04R3/00

Abstract: A device that includes an adaptive acoustic detection circuit and an acoustic sensor device such as a microphone is described. The device includes in addition to the sensor a circuit configured to detect when an input stimulus to the sensor satisfies an adaptive threshold, and further configured to produce a signal upon detection that causes adjustment of performance of the device, wherein the adaptive threshold is a threshold value that varies over time in accordance with detected changes to sound of an environment in which the device is located.