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Patent Agency Ranking
公开(公告)号：US20190355383A1
公开(公告)日：2019-11-21
申请号：US16515018
申请日：2019-07-17
Applicant: Analog Devices Global Unlimited Company
Inventor： Mikael 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：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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4.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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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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