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233 条记录 (耗时 0.016 秒)

    DIGITAL EQUALIZER ADAPTATION USING ON-DIE INSTRUMENT
    51.
    发明申请
    DIGITAL EQUALIZER ADAPTATION USING ON-DIE INSTRUMENT 审中-公开

    公开(公告)号：US20170214557A1

    公开(公告)日：2017-07-27

    申请号：US15483881

    申请日：2017-04-10

    申请人： Altera Corporation

    发明人： Tim Tri Hoang ,  Nam V. Nguyen

    IPC分类号： H04L25/03 ,  H04B3/14

    CPC分类号： H04L25/03885 ,  H03G3/002 ,  H04B1/16 ,  H04B3/143 ,  H04L5/006 ,  H04L25/03 ,  H04L25/03019 ,  H04L25/03057

    摘要： Systems and methods are provided for adjusting gain of a receiver. Adaptation circuitry is operable to identify, based on a matrix representation of a receiver's output generated from horizontal and vertical sweeps of the receiver's output, an eye opening of the receiver's output. The adaptation circuitry is also operable to determine whether a size of the eye opening needs to be changed. When it is determined that the size of the eye opening needs to be changed, the adaptation circuitry is operable to generate a digital signal to change a gain setting of the receiver. When the signal at the receiver's output is under-equalized, the AC gain of the receiver is increased. When the signal at the receiver's output is over-equalized, the AC gain of the receiver is decreased.

    Audio Compression System for Compressing an Audio Signal
    54.
    发明申请
    Audio Compression System for Compressing an Audio Signal 审中-公开
    用于压缩音频信号的音频压缩系统

    公开(公告)号：US20160344356A1

    公开(公告)日：2016-11-24

    申请号：US15225553

    申请日：2016-08-01

    申请人： Huawei Technologies Co., Ltd.

    发明人： Peter Grosche ,  Yue Lang ,  Qing Zhang

    IPC分类号： H03G3/00 ,  H04S7/00 ,  H03G11/00 ,  G10L19/26

    CPC分类号： H03G3/002 ,  G10L19/26 ,  H03G7/002 ,  H03G7/007 ,  H03G11/008 ,  H04S7/307

    摘要： An audio compression system for compressing an input audio signal, and the audio compression system comprises a digital filter for filtering the input audio signal, where the digital filter comprises a frequency transfer function having a magnitude over frequency, where the magnitude is formed by an equal loudness curve of a human ear to obtain a filtered audio signal, and a compressor which is configured to compress the input audio signal upon the basis of the filtered audio signal to obtain a compressed audio signal.

    摘要翻译： 一种用于压缩输入音频信号的音频压缩系统，并且音频压缩系统包括用于对输入音频信号进行滤波的数字滤波器，其中数字滤波器包括频率幅度超过频率的频率传递函数，其中幅度由等于 获得滤波后的音频信号的人耳的响度曲线;以及压缩器，被配置为基于经滤波的音频信号来压缩输入音频信号，以获得压缩音频信号。

    Noise cancellation
    55.
    发明授权
    Noise cancellation 有权

    公开(公告)号：US09430999B2

    公开(公告)日：2016-08-30

    申请号：US14948852

    申请日：2015-11-23

    申请人： Cirrus Logic International Semiconductor Ltd.

    发明人： Richard Clemow

    IPC分类号： G10K11/00 ,  G10K11/175 ,  G10K11/178 ,  H03G3/00 ,  H04R1/10

    CPC分类号： G10K11/002 ,  G10K11/175 ,  G10K11/178 ,  G10K2210/3027 ,  G10K2210/3028 ,  H03G3/002 ,  H04R1/1008

    摘要： A noise cancellation signal is generated by generating an ambient noise signal, representing ambient noise, and generating a noise cancellation signal, by applying the ambient noise signal to an feedforward filter, where the feedforward filter comprises a high-pass filter having an adjustable cut-off frequency, and by applying a controllable gain. The noise cancellation signal is then applied to a loudspeaker, to generate a sound to at least partially cancel the ambient noise. An error signal is generated, representing unwanted sound in the region of the loudspeaker. The phase of the ambient noise signal is compared to a phase of the error signal, and the gain is controlled on the basis of a result of the comparison, taking account of a phase shift introduced by the high-pass filter when performing the comparison.

    Systems and methods for gain calibration of an audio signal path
    57.
    发明授权
    Systems and methods for gain calibration of an audio signal path 有权
    用于音频信号路径的增益校准的系统和方法

    公开(公告)号：US09337795B2

    公开(公告)日：2016-05-10

    申请号：US14481201

    申请日：2014-09-09

    申请人： Cirrus Logic, Inc.

    发明人： Tejasvi Das ,  Xin Zhao ,  Ted Burk ,  Ku He ,  John L. Melanson ,  Xiaofan Fei

    IPC分类号： H03F99/00 ,  H03G3/20 ,  H03G3/00 ,  H04R29/00

    CPC分类号： H03G3/20 ,  H03G3/001 ,  H03G3/002 ,  H03G3/3005 ,  H03G3/3089

    摘要： A signal path may operate in one of a plurality of gain modes such that for each gain mode, the product of a digital gain and an analog signal gain of the signal path associated with the particular gain mode are approximately equal to a fixed path gain. During each of one or more calibration phases, a calibration system may measure analog signals at a plurality of nodes of the first path portion, calculate an actual analog gain associated with the gain mode based on the analog signals measured at the plurality of nodes, calculate an error between the fixed path gain and a mathematical product of the actual analog gain associated with the gain mode and the digital gain associated with the gain mode, and modify at least one of the digital gain and the analog gain associated with the gain mode in conformity with the error.

    摘要翻译： 信号路径可以以多种增益模式之一操作，使得对于每个增益模式，与特定增益模式相关联的信号路径的数字增益和模拟信号增益的乘积近似等于固定路径增益。 在一个或多个校准阶段的每一个期间，校准系统可以测量第一路径部分的多个节点处的模拟信号，基于在多个节点处测量的模拟信号来计算与增益模式相关联的实际模拟增益，计算 固定路径增益与与增益模式相关联的实际模拟增益与与增益模式相关联的数字增益的数学乘积之间的误差，并且修改与增益模式相关联的数字增益和模拟增益中的至少一个 符合错误。

    MODIFICATION OF ELECTRONIC SYSTEM OPERATION BASED ON ACOUSTIC AMBIENCE CLASSIFICATION
    59.
    发明申请
    MODIFICATION OF ELECTRONIC SYSTEM OPERATION BASED ON ACOUSTIC AMBIENCE CLASSIFICATION 审中-公开
    基于声学环境分类的电子系统操作修改

    公开(公告)号：US20150194151A1

    公开(公告)日：2015-07-09

    申请号：US14147366

    申请日：2014-01-03

    申请人： Gracenote, Inc.

    发明人： Suresh Jeyachandran ,  Vadim Brenner ,  Markus K. Cremer

    IPC分类号： G10L15/20

    CPC分类号： G10L15/20 ,  G10L25/48 ,  G10L2015/225 ,  H03G3/002 ,  H03G3/3005 ,  H03G3/3089

    摘要： Methods and systems for modification of electronic system operation based on acoustic ambience classification are presented. In an example method, at least one audio signal present in a physical environment of a user is detected. The at least one audio signal is analyzed to extract at least one audio feature from the audio signal. The audio signal is classified based on the audio feature to produce at least one classification of the audio signal. Operation of an electronic system interacting with the user in the physical environment is modified based on the classification of the audio signal.

    摘要翻译： 提出了基于声学环境分类的电子系统操作修改方法和系统。 在示例性方法中，检测出存在于用户的物理环境中的至少一个音频信号。 分析至少一个音频信号以从音频信号中提取至少一个音频特征。 基于音频特征对音频信号进行分类以产生音频信号的至少一个分类。 基于音频信号的分类修改在物理环境中与用户交互的电子系统的操作。

    High frequency smart buffer
    60.
    发明授权
    High frequency smart buffer 有权
    高频智能缓冲器

    公开(公告)号：US08928360B2

    公开(公告)日：2015-01-06

    申请号：US13854395

    申请日：2013-04-01

    申请人： STMicroelectronics R&D (Shanghai) Co. Ltd.

    发明人： Jian Hua Zhao ,  Wadeo Ou

    IPC分类号： H03K3/00 ,  H03G3/00 ,  H03G3/30

    CPC分类号： H03G3/004 ,  H03G3/002 ,  H03G3/3089

    摘要： Circuits and methods to realize a power-efficient high frequency buffer. The amplitude of a buffered signal is detected and compared with the amplitude of the input signal. The comparison result can be fed back to the digitally-controlled buffer to keep the output gain constant. By using feedback control, the buffer can be kept at the most suitable biasing condition even if the load condition or signal frequency varies.

    摘要翻译： 实现功率高效的高频缓冲器的电路和方法。 检测缓冲信号的幅度并与输入信号的幅度进行比较。 比较结果可以反馈到数字控制缓冲器，以保持输出增益不变。 通过使用反馈控制，即使负载条件或信号频率变化，也可以将缓冲器保持在最合适的偏置状态。