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公开(公告)号：US09813812B2
公开(公告)日：2017-11-07
申请号：US14569182
申请日：2014-12-12
Applicant: Analog Devices Global
CPC classification number: H04R3/007 , H03G9/005 , H03G9/025 , H04R29/001 , H04R2430/03
Abstract: The present application relates in one aspect to a method of controlling diaphragm excursion of an electrodynamic loudspeaker. The method comprises dividing the audio input signal into at least a low-frequency band signal and a high-frequency band signal by a band-splitting network and applying the low-frequency band signal to a diaphragm excursion estimator. The instantaneous diaphragm excursion is determined based on the low-frequency band signal. The determined instantaneous diaphragm excursion is compared with an excursion limit criterion. The low-frequency band signal is limited based on a result of the comparison between the instantaneous diaphragm excursion and the excursion limit criterion to produce a limited low-frequency band signal which is combined with the high-frequency band signal to produce an excursion limited audio signal.
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公开(公告)号：US09648432B2
公开(公告)日：2017-05-09
申请号：US14059153
申请日：2013-10-21
Applicant: Analog Devices Global
Inventor： Yang Pan , Fanjiong Zhang , Kim Spetzler Berthelsen , Michael W. Determan
CPC classification number: H04R29/001 , H04R3/007 , H04R3/08
Abstract: A method of controlling sound reproduction may include applying an audio signal to a voice coil of the electrodynamic loudspeaker to produce sound, detecting one of an impedance and admittance of the loudspeaker across a predetermined audio frequency range based on a detected voice coil current and voice coil voltage and determining a fundamental resonance frequency of the loudspeaker based on the detected impedance or admittance. The fundamental resonance frequency of the loudspeaker may be compared with a nominal fundamental resonance frequency of the loudspeaker representing a nominal acoustic operating condition of the loudspeaker. A change of operating condition of the loudspeaker may be detected based on a frequency deviation between the determined fundamental resonance frequency and a nominal fundamental resonance frequency of the loudspeaker. The level of the audio signal may be attenuated in response to the frequency deviation meets a predetermined frequency error criterion.
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公开(公告)号：US09258659B2
公开(公告)日：2016-02-09
申请号：US13948663
申请日：2013-07-23
Applicant: ANALOG DEVICES GLOBAL
Inventor： Yang Pan , Fanjiong Zhang , Kim Spetzler Berthelsen , Michael W. Determan
CPC classification number: H04R29/001 , H04R3/007 , H04R3/08
Abstract: A method of detecting enclosure leakage of an electrodynamic loudspeaker mounted in an enclosure or box may include applying an audio signal to a voice coil of the electrodynamic loudspeaker through an output amplifier and detecting a voice coil current flowing into the voice coil. A voltage across the voice coil may be detected and an impedance or admittance of the loudspeaker across a predetermined audio frequency range may be detected based on the detected voice coil current and voice coil voltage. A fundamental resonance frequency of the loudspeaker may be determined based on the detected impedance or admittance and compared with a nominal fundamental resonance frequency of the loudspeaker representing a sealed state of the enclosure. Acoustic leakage of the enclosure may be detected based on a deviation between the determined the fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker.
Abstract translation: 检测安装在外壳或盒中的电动扬声器的机壳泄漏的方法可以包括通过输出放大器将音频信号施加到电动扬声器的音圈并检测流入音圈的音圈电流。 可以检测音圈两端的电压，并且可以基于检测到的音圈电流和音圈电压来检测扬声器在预定音频范围内的阻抗或导纳。 扬声器的基本共振频率可以基于检测到的阻抗或导纳来确定，并与表示封装的密封状态的扬声器的标称基本共振频率进行比较。 可以基于确定的基本共振频率和电动扬声器的标称基本共振频率之间的偏差来检测外壳的声学泄漏。
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公开(公告)号：US09980068B2
公开(公告)日：2018-05-22
申请号：US14073324
申请日：2013-11-06
Applicant: Analog Devices Global
Inventor： Kim Spetzler Berthelsen , Kasper Strange
CPC classification number: H04R29/001 , H03F1/52 , H03F2200/462 , H03F2200/471 , H03G7/08 , H03G9/005 , H03G11/04 , H04R1/00 , H04R3/002 , H04R3/007 , H04R29/00 , H04R29/003
Abstract: A method of estimating diaphragm excursion of an electrodynamic loudspeaker may be performed using audio signals. An audio output signal may be applied to a voice coil of the electrodynamic loudspeaker through an output amplifier to produce sound. A detected voice coil current and a determined voice coil voltage may be applied to a linear adaptive digital loudspeaker model that has a plurality of adaptive loudspeaker parameters. The parameter values of the adaptive loudspeaker parameters may be computed based on the linear adaptive digital loudspeaker model and applied to a non-linear state-space model of the electrodynamic loudspeaker. For the non-linear state-space model, a predetermined non-linear function may be applied to at least one of the plurality of received parameter values to compute at least one non-linearity compensated parameter value of the adaptive loudspeaker parameters, to determine an instantaneous excursion of the diaphragm.
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Patent Agency Ranking
公开(公告)号：US10360926B2
公开(公告)日：2019-07-23
申请号：US15321743
申请日：2015-07-07
Applicant: Analog Devices Global Unlimited Company
Inventor： Mikael M. Mortensen , Kim Spetzler Berthelsen , Robert Adams , Andrew Milia
Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.
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公开(公告)号：US10219090B2
公开(公告)日：2019-02-26
申请号：US13779314
申请日：2013-02-27
Applicant: Analog Devices Global
Inventor： Robert Adams , Kim Spetzler Berthelsen
Abstract: The present invention relates in one aspect to a method of detecting diaphragm excursion of an electrodynamic loudspeaker. The method comprises steps of generating an audio signal for application to a voice coil of the electrodynamic loudspeaker and adding a high-frequency probe signal to the audio signal to generate a composite drive signal. The method further comprises a step of applying the composite drive signal to the voice coil through an output amplifier and detecting a modulation level of a probe signal current flowing through the voice coil.
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7.发明授权公开(公告)号：US09531433B2
公开(公告)日：2016-12-27
申请号：US14175480
申请日：2014-02-07
Applicant: Analog Devices Global
Inventor： Kim Spetzler Berthelsen , Robert Adams , Kasper Strange
Abstract: A feedback cancellation assembly for an electroacoustic communication apparatus may include a signal transmission path for generation and emission of an outgoing sound signal to an external environment through an electrodynamic loudspeaker and a signal reception path comprising a microphone for generation of a microphone input signal corresponding to sound received from the external environment. The signal reception path may generate a digital microphone signal. The outgoing sound signal may be acoustically coupled to the microphone. An electronic feedback cancellation path may be coupled between a tapping node and a summing node to produce a feedback cancellation signal to the summing node.
Abstract translation: 用于电声通信设备的反馈消除组件可以包括用于通过电动扬声器产生和发射到外部环境的输出声音信号的信号传输路径，以及包括用于产生对应于声音的麦克风输入信号的麦克风的信号接收路径 从外部环境收到。 信号接收路径可以产生数字麦克风信号。 输出声音信号可以声学耦合到麦克风。 电子反馈消除路径可以耦合在轻敲节点和求和节点之间以产生到求和节点的反馈消除信号。
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8.发明授权公开(公告)号：US09525939B2
公开(公告)日：2016-12-20
申请号：US14511955
申请日：2014-10-10
Applicant: ANALOG DEVICES GLOBAL
Inventor： Kim Spetzler Berthelsen , Kasper Strange
Abstract: The present invention relates in one aspect to a voice coil temperature protector for electrodynamic loudspeakers. The voice coil temperature protector comprises an audio signal input for receipt of an audio signal supplied by an audio signal source and a probe signal source for generation of a low-frequency probe signal. A signal combiner is configured to combine the audio signal with the low-frequency probe signal to provide a composite loudspeaker drive signal comprising an audio signal component and a probe signal component. The voice coil temperature protector comprises a current detector configured for detecting a level of a probe current component flowing through the voice coil in response to the composite loudspeaker drive signal and a current comparator which is configured to comparing the detected level of the probe current component with a predetermined probe current threshold. The predetermined probe current threshold corresponds to a predetermined voice coil temperature via a known temperature dependency of a voice coil resistance. The voice coil temperature protector further comprises a signal controller configured for attenuating a level of the audio signal in response to the probe current component falls below the predetermined probe current threshold.
Abstract translation: 本发明在一个方面涉及一种用于电动扬声器的音圈温度保护器。 音圈温度保护器包括用于接收由音频信号源提供的音频信号的音频信号输入端和用于产生低频探测信号的探测信号源。 信号组合器被配置为将音频信号与低频探测信号组合以提供包括音频信号分量和探测信号分量的复合扬声器驱动信号。 音圈温度保护器包括电流检测器，其被配置为响应于复合扬声器驱动信号检测流过音圈的探头电流分量的电平;以及电流比较器，其被配置为将探测电流分量的检测电平与 预定的探针电流阈值。 预定的探针电流阈值通过音圈电阻的已知温度依赖性对应于预定的音圈温度。 音圈温度保护器还包括信号控制器，该信号控制器被配置为响应于探头电流分量而降低到低于预定探针电流阈值的音频信号的电平。
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公开(公告)号：US09479865B2
公开(公告)日：2016-10-25
申请号：US14231192
申请日：2014-03-31
Applicant: Analog Devices Global
Inventor： Khiem Quang Nguyen , Kim Spetzler Berthelsen , Robert Adams
CPC classification number: H04R3/00 , G06F3/0433 , H03F1/32 , H03F3/181 , H03F3/38 , H03F2200/03 , H03M3/356
Abstract: A transducer amplification circuit may include a preamplifier circuit with a signal input receiving a transducer signal to provide an amplified transducer signal comprising audible frequency components and ultrasonic frequency components. The transducer amplification circuit may include a first sigma-delta modulator configured to sample and quantize the amplified transducer signal to generate a first digital transducer signal comprising a first quantization noise signal. The first sigma-delta modulator may include a first noise transfer function having a high pass response in at least a portion of an audible frequency range to push the quantization noise signal to ultrasonic frequencies. A second sigma-delta modulator is configured to sample and quantize the amplified transducer signal to generate a second digital transducer signal comprising a second quantization noise signal. The second sigma-delta modulator may include a second noise transfer function with a magnitude minimum placed at the ultrasonic frequencies.
Abstract translation: 换能器放大电路可以包括具有接收换能器信号的信号输入的前置放大器电路，以提供包括可听频率分量和超声频率分量的放大的换能器信号。 换能器放大电路可以包括第一Σ-Δ调制器，其被配置为对放大的换能器信号进行采样和量化，以产生包括第一量化噪声信号的第一数字换能器信号。 第一Σ-Δ调制器可以包括在可听频率范围的至少一部分中具有高通响应的第一噪声传递函数，以将量化噪声信号推送到超声波频率。 第二Σ-Δ调制器被配置为对放大的换能器信号进行采样和量化，以产生包括第二量化噪声信号的第二数字换能器信号。 第二Σ-Δ调制器可以包括放大在超声波频率处的幅度最小的第二噪声传递函数。
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