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公开(公告)号：US11341974B2
公开(公告)日：2022-05-24
申请号：US16880066
申请日：2020-05-21
Inventor： John P. Lesso
Abstract: A speech signal is received by a device comprising first and second transducers, and the first transducer comprises a microphone. A method comprises performing a first voice biometric process on speech contained in a first part of a signal received by the microphone, in order to determine whether the speech is the speech of an enrolled user. A first correlation is determined, between said first part of the signal received by the microphone and a corresponding part of the signal received by the second transducer. A second correlation is determined, between said second part of the signal received by the microphone and the corresponding part of the signal received by the second transducer. It is then determined whether the first correlation and the second correlation satisfy a predetermined condition. If it is determined that the speech contained in the first part of the received signal is the speech of an enrolled user and that the first correlation and the second correlation satisfy the predetermined condition, the received speech signal is authenticated.
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公开(公告)号：US11272293B2
公开(公告)日：2022-03-08
申请号：US17163175
申请日：2021-01-29
Inventor： John P. Lesso
IPC: H04R9/06 , H03H17/06 , H03K5/13 , H03K5/1534 , H03F3/217
Abstract: A system for driving a transducer having a plurality of coils, the system comprising: a modulator for outputting a digital output signal representative of a received analogue input signal at a modulator output; a clock controlled delay element for applying a delay to the digital output signal to generate a first delayed signal at a delay element output; wherein the modulator output is couplable to a first coil of the plurality of the coils of the transducer and the delay element output is couplable to a second coil of the plurality of coils of the transducer.
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公开(公告)号：US20220029533A1
公开(公告)日：2022-01-27
申请号：US17494426
申请日：2021-10-05
Inventor： John P. Lesso , Peter J. Frith , John L. Pennock
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3 VV, +/−VV/5 or +/−VV/6.
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公开(公告)号：US11122350B1
公开(公告)日：2021-09-14
申请号：US16996230
申请日：2020-08-18
Inventor： John P. Lesso
Abstract: A method for on ear detection for a headphone, the method comprising: receiving a first microphone signal derived from an first microphone of the headphone and determining, from the first microphone signal, a first resonance frequency associated with an acoustic port of the first microphone, the first resonance frequency dependent on a first temperature at the first microphone; receiving a second microphone signal derived from an second microphone of the headphone and determining, from the second microphone signal, a second resonance frequency associated with an acoustic port of the second microphone, the second resonance frequency dependent on a second temperature at the second microphone.
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公开(公告)号：US10945069B1
公开(公告)日：2021-03-09
申请号：US16777172
申请日：2020-01-30
Inventor： John P. Lesso
IPC: H04R3/00 , H03F3/217 , H03F3/185 , H03K5/156 , H03K5/13 , H03H17/06 , H04R9/06 , H04R9/04 , H04R1/02 , H03K5/1534
Abstract: A system for driving a loudspeaker having a plurality of coils, the system comprising: a modulator configured to receive an input signal and to output a pulse width modulated (PWM) output signal representative of the received input signal; a delay element for receiving and applying a delay to the PWM output signal to generate a first delayed signal; a first output configured to be coupled to a first coil of the plurality of coils of the loudspeaker, wherein the first output is coupled to the output of the modulator; and a second output configured to be coupled to a second coil of the plurality of coils of the loudspeaker, wherein the second output is coupled to the output of the delay.
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Patent Agency Ranking
公开(公告)号：US10361709B2
公开(公告)日：2019-07-23
申请号：US15983378
申请日：2018-05-18
Inventor： John P. Lesso
Abstract: A clock generator receives first and second clock signals, and input representing a desired frequency ratio. A comparison is made between frequencies of an output clock signal and the first clock signal, and a first error signal represents the difference between the desired frequency ratio and this comparison result. The first error signal is filtered. A comparison is made between frequencies of the output clock signal and the second clock signal, and a second error signal represents the difference between the filtered first error signal and this comparison result. The second error signal is filtered. A numerically controlled oscillator receives the filtered second error signal and generates an output clock signal. As a result, the output clock signal has the jitter characteristics of the first input clock signal over a useful range of jitter frequencies and the frequency accuracy of the second input clock signal.
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公开(公告)号：US10312802B2
公开(公告)日：2019-06-04
申请号：US15628021
申请日：2017-06-20
Inventor： John P. Lesso , Peter J. Frith , John L. Pennock
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3 VV, +/−VV/5 or +/−VV/6.
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公开(公告)号：US10014769B2
公开(公告)日：2018-07-03
申请号：US15597850
申请日：2017-05-17
Inventor： John P. Lesso , Peter J. Frith , John L. Pennock
CPC classification number: H02M3/07 , H02M1/00 , H02M2001/0083 , H02M2001/009 , H03F3/181
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes and a second pair of output nodes, and two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first bipolar output voltage at the first pair of output nodes and a second bipolar output voltage at the second pair of bipolar output nodes.
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公开(公告)号：US20170288534A1
公开(公告)日：2017-10-05
申请号：US15628021
申请日：2017-06-20
Inventor： John P. Lesso , Peter J. Frith , John L. Pennock
CPC classification number: H02M3/07 , H02M2003/071 , H02M2003/072 , H03G3/30
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3 VV, +/−VV/5 or +/−VV/6.
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公开(公告)号：US09673700B2
公开(公告)日：2017-06-06
申请号：US15222095
申请日：2016-07-28
Inventor： John P. Lesso , John L. Pennock , Peter J. Frith
CPC classification number: H02M3/07 , H03F1/025 , H03F3/185 , H03F3/187 , H03F3/68 , H03F2200/507 , H03F2200/511 , H03G1/0017 , H03G1/0029 , H03G1/0088 , H03G1/0094
Abstract: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.
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