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公开(公告)号：US10566992B2
公开(公告)日：2020-02-18
申请号：US16375868
申请日：2019-04-05
Inventor： John Paul Lesso
IPC: H03M3/00 , H03K21/38 , H03K3/0233 , H03M1/50 , H03K7/08
Abstract: This application relates to time-encoding modulators (301,700) having a self-oscillating modulator module configured to receive an input signal and output a pulse-width modulated signal (SPWM) where the pulse-width modulated signal is synchronised to a first clock signal (CLK1). A hysteretic comparator module (302) located in a feedforward path is configured to generate the time encoded signal (SPWM) at a first node (304) based on the input signal (SIN) and a feedback signal (SFB). A feedback path is coupled to the first node to provide the feedback signal, which is either applied to an input of the hysteretic comparator module via a loop filter (701) in the feedback path or applied to the feedforward path prior to a loop filter (701) upstream of the hysteretic comparator module (302). The hysteretic comparator module (302) is configured such that any change in state of the time encoded signal at the first node is synchronised to the first clock signal (CLK1).
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公开(公告)号：US10530303B2
公开(公告)日：2020-01-07
申请号：US15582861
申请日：2017-05-01
Inventor： Jeffrey Allen May , Eric J. King , Firas Azrai
Abstract: In accordance with embodiments of the present disclosure, a system may include a circuit having a power converter and an amplifier, wherein the power converter is configured to generate an intermediate voltage, provide the intermediate voltage as an amplifier supply voltage to the amplifier, and share the intermediate voltage with one or more additional circuits external to the circuit, wherein at least one of the one or more additional circuits is configured to generate the intermediate voltage.
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公开(公告)号：US10509624B2
公开(公告)日：2019-12-17
申请号：US15706215
申请日：2017-09-15
Inventor： Bruce Duewer , Dylan Hester , Shafagh Kamkar
Abstract: Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. In the digital domain, when converting the single-bit audio stream to a plurality of symbols, the plurality of symbols is selected based, at least in part, on audio content of the single-bit audio stream and a desired volume level. In the analog domain, when converting an analog current signal output from a current-steering DAC processing the plurality of symbols to an analog voltage signal, an analog gain value may be selected based, at least in part, on the desired volume level.
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公开(公告)号：US10432151B2
公开(公告)日：2019-10-01
申请号：US15988823
申请日：2018-05-24
Inventor： John Paul Lesso , Toru Ido
IPC: H03F3/68 , H04B15/00 , H04R3/02 , H03F1/32 , H03F3/187 , H04R3/04 , H03F1/02 , H03F3/217 , H04R1/10
Abstract: This application relates to methods and apparatus for amplification of audio signals with improved audio performance. An audio driving circuit has an amplifier module in a forward signal path between an input for receiving an input audio signal (SIN) and an output for outputting an audio driving signal (VOUT). A pre-distortion module is operable to apply a first transfer function to the signal in the forward signal path upstream of the amplifier module, wherein the first transfer function comprises a non-linear distortion function based on at least one distortion setting. An error block is arranged to receive a first signal (SFF) derived from the input signal and a second signal (SFB) indicative of the voltage of the audio driving signal and determine a first error signal (ε1) indicative of a difference between the first and second signals. The pre-distortion module is operable to control the distortion setting(s) based on the first error signal.
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公开(公告)号：US10419851B2
公开(公告)日：2019-09-17
申请号：US15304728
申请日：2015-04-17
Inventor： Henry Chen
Abstract: A method of mixing microphone signals. First and second microphone signals are obtained from respective first and second microphones. In at least one affected subband, the first and second microphone signals are mixed to produce first and second mixed signals. At least one reference subband of the first and second microphone signals is processed in order to identify a binaural cue between the first and second microphone signals, the reference subband being distinct from the or each affected subband. The affected subband in the first and second mixed signals is modified in order to re-emphasize the identified binaural cue.
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Patent Agency Ranking
公开(公告)号：US10375483B2
公开(公告)日：2019-08-06
申请号：US15636019
申请日：2017-06-28
Inventor： Scott Lyall Cargill
Abstract: The application describes MEMS transducers comprising a flexible membrane supported at a supporting edge relative to a substrate and further comprising one or more unbound edges. The shape of the unbound edge is selected so that the flexible membrane tends to bend along more than one bend axis in the region of the supporting edge.
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公开(公告)号：US10338883B2
公开(公告)日：2019-07-02
申请号：US15575244
申请日：2016-05-20
Inventor： Pär Gunnars Risberg , Carl Lennart Stahl , Landy Toth
Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.
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公开(公告)号：US10334339B2
公开(公告)日：2019-06-25
申请号：US15538584
申请日：2015-12-04
Inventor： John Laurence Pennock , Tsjerk Hoekstra , David Talmage Patten
Abstract: A MEMS transducer package (1) comprises a semiconductor die element (3) and a cap element (23). The semiconductor die element (3) and cap element (23) have mating surfaces (9, 21). The semiconductor die element (3) and cap element (23) are configured such that when the semiconductor die element (3) and cap element (4) are conjoined, a first volume (7, 27) is formed through the semiconductor die element (3) and into the semiconductor cap element (23), and an acoustic channel is formed to provide an opening between a non-mating surface (11) of the semiconductor die element (3) and a side surface (10, 12) of the transducer package.
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公开(公告)号：US10319361B2
公开(公告)日：2019-06-11
申请号：US15383839
申请日：2016-12-19
Inventor： Richard Clemow
IPC: H04R1/10 , H04R3/02 , G10K11/16 , G10K11/178
Abstract: A digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible. The arrangement converts the analog signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed forward applications.
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公开(公告)号：US10306387B2
公开(公告)日：2019-05-28
申请号：US15918829
申请日：2018-03-12
Inventor： Jonathan Taylor , ChunFeng Gu
Abstract: A device (10) for connection to an audio accessory (20) comprising: a jack socket (14) for connection to a jack plug (25) of the audio accessory (20), a ground connection to a first socket contact (428) which is positioned to mate with a ground return pole of the plug (25). The jack socket (14) comprises a second contact (432) also positioned to mate with the ground return pole of the plug (25). Driver amplifiers (416, 418) comprise an input coupled to the second contact (432) and are configured to superimpose a signal present at the second contact (432) onto received speaker signal. It may achieve reducing the crosstalk which could distort or blur the stereo image.
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