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    Slim-tunnel wind port for a communication device
    1.
    发明授权
    Slim-tunnel wind port for a communication device 有权

    公开(公告)号：US09877097B2

    公开(公告)日：2018-01-23

    申请号：US14735407

    申请日：2015-06-10

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Teik Seng Saw ,  Cheah Heng Tan ,  Huoy Thyng Yow

    IPC: H04R1/08

    CPC classification number: H04R1/086 ,  H04R2410/07 ,  H04R2499/11

    Abstract: A housing having a port for reducing wind-induced noise in a communication device. The housing includes a first channel, a second channel, and a ridge between the first and second channels. The housing further includes a tunnel extending through the ridge, which tunnel connects the first and second channels. The housing further includes a microphone port beneath the ridge, which microphone port is connected to the tunnel and connects the tunnel to a microphone cavity in the housing.

    METHOD FOR PREPROCESSING SPEECH FOR DIGITAL AUDIO QUALITY IMPROVEMENT
    3.
    发明申请
    METHOD FOR PREPROCESSING SPEECH FOR DIGITAL AUDIO QUALITY IMPROVEMENT 有权
    用于数字音频质量改进的语音预处理方法

    公开(公告)号：US20160351203A1

    公开(公告)日：2016-12-01

    申请号：US14724375

    申请日：2015-05-28

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Cheah Heng Tan ,  Linus Francis ,  Robert J. Novorita

    IPC: G10L21/02 ,  H04R1/46

    CPC classification number: H04R1/46 ,  G10L19/265 ,  G10L21/0364 ,  H04R1/1016 ,  H04R3/005 ,  H04R2460/13

    Abstract: Preprocessing speech signals from an indirect conduction microphone. One exemplary method preprocesses the speech signal in two stages. In stage one, an external speech sample is characterized using an auto regression model, and coefficients from the model are convolved with the internal speech signal from the indirect conduction microphone to produce a pre-conditioned internal speech signal. In stage two, a training sound is received by the indirect conduction microphone and filtered through a low-pass filter. The result is then modeled using auto regression, and inverted to produce an inverted filter model. The pre-conditioned internal speech signal is convolved with the inverted filter model to remove negative or undesirable acoustic characteristics and loss from the speech signal from the indirect conduction microphone.

    Abstract translation: 从间接传导麦克风预处理语音信号。 一个示例性方法分两个阶段对语音信号进行预处理。 在第一阶段，使用自回归模型来表征外部语音样本，并且来自该模型的系数与来自间接传导麦克风的内部语音信号进行卷积以产生预处理的内部语音信号。 在第二阶段，间接传导麦克风接收到训练声，并通过低通滤波器进行滤波。 然后使用自动回归模拟结果，并反转以产生反向过滤器模型。 预处理的内部语音信号与反向滤波器模型进行卷积，以消除来自间接传导麦克风的语音信号的负面或不良声学特性和损耗。

    Method and apparatus for voice activity detection
    4.
    发明授权
    Method and apparatus for voice activity detection 有权

    公开(公告)号：US10381024B2

    公开(公告)日：2019-08-13

    申请号：US15498560

    申请日：2017-04-27

    Applicant: MOTOROLA SOLUTIONS, INC

    Inventor： Cheah Heng Tan ,  Thean Hai Ooi ,  Wei Qing Ong ,  Alan Wee Chiat Tan

    IPC: G10L25/84 ,  G10L25/18 ,  G10L25/78 ,  G10L25/03

    Abstract: A voice activity detection system (100) filters audio input frames (102), on a frame=by-frame basis through a gammatone filterbank (104) to generate filtered gammatone output signals (106). A signal energy calculator (108) takes the filtered gammatone output signals and generates a plurality of energy envelopes. Weighting factors are constructed (112) are applied to each of the energy envelopes thereby producing normalized weighted signal (116), in which voice regions are emphasized and noise regions are minimized. An entropy measurement (118) is taken to extract information from the normalized weighted signals (116) and generate an entropy signal (120). The entropy signal (120) is averaged and compared to an adaptive entropy threshold (122), indicative of a noise floor. Decision logic (124) is used to identifying speech and noise from the comparison of the averaged entropy signal to the adaptive entropy threshold.

    Intrinsically safe audio circuit for a portable two-way radio
    5.
    发明授权
    Intrinsically safe audio circuit for a portable two-way radio 有权
    用于便携式双向无线电的本质安全音频电路

    公开(公告)号：US09369800B2

    公开(公告)日：2016-06-14

    申请号：US14037900

    申请日：2013-09-26

    Applicant: MOTOROLA SOLUTIONS, INC

    Inventor： Cheah Heng Tan ,  Friedrich J Bollmann ,  Teik Seng Saw ,  Peter William Hilding Svendsen ,  Kheng Shiang Teh

    IPC: G03G11/00 ,  H04R3/00 ,  H04R9/02

    CPC classification number: H04R3/007 ,  H04R9/022 ,  H04R2209/024 ,  H04R2209/041

    Abstract: An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any one of the coils. Each separate coil is driven by one of several different audio power amplifiers that each output a substantially identical signal, and each of which are current limited.

    Abstract translation: 本质安全的音频电路和本质安全的便携式双向无线电设备通过将设备扬声器的扬声器线圈分离成单独的线圈来限制任何一个线圈中的能量存储，从而满足传统的音频输出要求和本质安全的设计限制。 每个单独的线圈由几个不同的音频功率放大器中的一个驱动，每个音频功率放大器输出基本相同的信号，并且其中的每个都是电流限制的。

    Apparatus and method for coordinating use of different microphones in a communication device
    7.
    发明授权
    Apparatus and method for coordinating use of different microphones in a communication device 有权

    公开(公告)号：US09648419B2

    公开(公告)日：2017-05-09

    申请号：US14539739

    申请日：2014-11-12

    Applicant: MOTOROLA SOLUTIONS, INC

    Inventor： Cheah Heng Tan ,  Kheng Shiang Teh ,  Pek Bing Teo

    IPC: H04R3/00 ,  H04R1/10 ,  G10L25/84

    CPC classification number: H04R3/005 ,  G10L25/84 ,  H04R1/1041 ,  H04R2410/05 ,  H04R2460/13

    Abstract: A communication device is configured to receive signals using at least one acoustic microphone and at least one structural microphone. The communication device calculates one of first a signal-to-noise (SNR) ratio and a speech-to-noise ratio for the at least one acoustic microphone from received signals and calculates a SNR for the at least one structural microphone from received signals. The communication device compares one of the first SNR and the speech-to-noise ratio for the at least one acoustic microphone with the SNR for the at least one structural microphone. The communication device selects one of the at least one acoustic microphone and at least one structural microphone to receive speech responsive to the comparing and places a selected one of the at least one acoustic microphone and at least one structural microphone in a standby mode.

    BATTERY MODULE FOR COMMUNICATION DEVICES HAVING AN ACCESSORY INTERFACE
    9.
    发明申请
    BATTERY MODULE FOR COMMUNICATION DEVICES HAVING AN ACCESSORY INTERFACE 有权
    具有附件接口的通信设备的电池模块

    公开(公告)号：US20160360022A1

    公开(公告)日：2016-12-08

    申请号：US14728823

    申请日：2015-06-02

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Macwien Krishnamurthi ,  Kow Chee Chong ,  Cheah Chan Kee ,  Cheah Heng Tan ,  Yusasmadi Yusof

    IPC: H04M1/725 ,  H04B1/3883

    CPC classification number: H04M1/72527 ,  H01M10/4257 ,  H01M2220/30 ,  H04B1/3883 ,  H04M1/0262

    Abstract: A battery module for a portable communication device having a controller. In one embodiment, the battery module includes a battery accessory interface having a positive terminal, an identifying terminal, and a negative terminal. A voltage regulator is connected to the positive terminal of the battery accessory interface and configured to output a voltage on the positive terminal in response to a control signal. An addressable switch is connected to the identifying terminal of the battery accessory interface. The addressable switch is configured to communicate with the controller and generate the control signal based on input from the controller and the identifying terminal.

    Abstract translation: 一种用于具有控制器的便携式通信设备的电池模块。 在一个实施例中，电池模块包括具有正极端子，识别端子和负极端子的电池附件接口。 电压调节器连接到电池附件接口的正极端子，并且被配置为响应于控制信号在正极端子上输出电压。 可寻址开关连接到电池附件接口的识别端。 可寻址开关被配置为与控制器通信，并且基于来自控制器和识别终端的输入来生成控制信号。

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