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51. 发明授权

US3753159A Variable bandpass dynamic noise filter 失效
标题翻译： VARIABLE BANDPASS动态噪声滤波器
公开(公告)号：US3753159A
公开(公告)日：1973-08-14
申请号：US3753159D
申请日：1971-07-26
申请人： BURWEN R
发明人： BURWEN R
IPC分类号： G11B5/00 , H03G3/34 , H03G5/16 , H03G5/18 , H03G9/02 , H03G11/08 , H03H11/04 , H03H7/12
CPC分类号： H03G11/08 , G11B5/00 , H03G3/345 , H03G5/16 , H03G5/18 , H03G9/025
摘要： A variable bandpass filter for a dynamic noise filtering effect that reduces the perceptible noise in an audio reproduction system. The variable bandpass filter responds to peak signal levels in relatively high and relatively low frequency portions of the audio spectrum to automatically and independently vary high and low frequency cutoff points for the filter in correspondence with the level of signals at those frequencies. Low distortion and wide dynamic range is achieved in a filter configuration which comprises a forward signal path and a reverse signal path, each having a variable integration response provided by temperature compensated and linearized field-effect transistor circuits. The integration response of the two paths imparts a high and low frequency filtering effect. A further constant gain feedback path establishes a uniform middle frequency amplification for the variable bandpass filter.
摘要翻译：用于动态噪声滤波效果的可变带通滤波器，其降低音频再现系统中的可感知噪声。可变带通滤波器响应音频频谱的相对较高和相对低频部分的峰值信号电平，以自动且独立地改变与这些频率处的信号电平对应的滤波器的高频和低频截止点。在包括正向信号路径和反向信号路径的滤波器配置中实现了低失真和宽的动态范围，每个具有由温度补偿和线性化场效应晶体管电路提供的可变积分响应。这两个路径的积分响应赋予了高低频滤波效果。另外恒定的增益反馈路径为可变带通滤波器建立了均匀的中频放大。

52. 发明授权

US3017506A Selective signal eliminator 失效
标题翻译：选择性信号消除器
公开(公告)号：US3017506A
公开(公告)日：1962-01-16
申请号：US78547059
申请日：1959-01-07
申请人： SYLVANIA ELECTRIC PROD
发明人： JUDY HAROLD A
IPC分类号： H03G3/34
CPC分类号： H03G3/345

53. 发明授权

US2866848A Method of improving intelligence under random noise interference 失效
标题翻译：在随机噪声干扰下提高智能的方法
公开(公告)号：US2866848A
公开(公告)日：1958-12-30
申请号：US42076454
申请日：1954-04-02
申请人： FOGEL LAWRENCE J
发明人： FOGEL LAWRENCE J
IPC分类号： H03G3/34
CPC分类号： H03G3/345

54. 发明授权

US2822466A Apparatus for reducing radio interference 失效
标题翻译：减少无线电干扰的装置
公开(公告)号：US2822466A
公开(公告)日：1958-02-04
申请号：US38829953
申请日：1953-10-26
申请人： LIGHTING & TRANSIENTS RES INST
发明人： NEWMAN MORRIS M
IPC分类号： H03G3/26 , H03G3/34
CPC分类号： H03G3/345 , H03G3/26

55. 发明授权

US09305537B2 Signal processing apparatus concealing impulse noise by autoregressive modeling 有权
标题翻译：信号处理设备通过自回归建模隐藏脉冲噪声
公开(公告)号：US09305537B2
公开(公告)日：2016-04-05
申请号：US14142727
申请日：2013-12-27
申请人： NXP B.V.
发明人： Sebastiaan de Bont
IPC分类号： G10K11/16 , G10L21/0224 , G10L19/005 , H03G3/34 , G10L21/0264
CPC分类号： G10K11/16 , G10L19/005 , G10L21/0224 , G10L21/0264 , H03G3/345
摘要： A signal processing apparatus (100) comprising a noise detector (102) configured to: receive a stream of information representative of a stream of audio signal samples (112); and detect samples in the received stream of information (112) that are distorted by impulse noise in order to generate a noise detection signal (114), wherein the noise detection signal (114) also identifies preceding and succeeding samples that are undistorted. The signal processing apparatus (100) also comprises a processor (104) configured to replace distorted samples in the received stream of information with composite predicted values (426; 526) to provide a reconstructed stream of audio signal samples (116).
摘要翻译：一种信号处理设备（100），包括噪声检测器（102），其被配置为：接收表示音频信号样本流（112）的信息流; 并且检测所接收的信息流（112）中的被脉冲噪声失真的样本，以便产生噪声检测信号（114），其中所述噪声检测信号（114）还识别未失真的先前和后续采样。信号处理设备（100）还包括处理器（104），其被配置为用复合预测值（426; 526）替换所接收的信息流中的失真样本，以提供重构的音频信号样本流（116）。

56. 发明授权

US09171538B2 Method and system for reducing impulsive noise disturbance 有权
标题翻译：减少冲击噪声干扰的方法和系统
公开(公告)号：US09171538B2
公开(公告)日：2015-10-27
申请号：US14023704
申请日：2013-09-11
申请人： NXP B.V.
发明人： Temujin Gautama
IPC分类号： G10K11/178 , H04B1/10 , G10L21/0208 , H03G3/34 , G10L21/0224 , G10L21/0232
CPC分类号： G10K11/178 , G10L21/0208 , G10L21/0224 , G10L21/0232 , H03G3/345 , H04B1/1027
摘要： FM and AM receivers in car environments require a noise blanker circuit or method to reduce the audible disturbances generated by impulse noise, such as ignition noise, in the audio signal. The invention proposes a combination of time-domain and frequency-domain processing to reduce the audible distortion. The time-domain processing interpolates the signal during the impulse noise bursts, and the frequency-domain processing disperses the remaining signal distortion over time, or relocates it to positions in time where it is attenuated by a windowing technique.
摘要翻译：汽车环境中的FM和AM接收机需要一个噪声抑制电路或方法来减少音频信号中脉冲噪声（如点火噪声）产生的声音干扰。本发明提出了时域和频域处理的组合，以减少可听见的失真。时域处理在脉冲噪声突发期间内插信号，并且频域处理随着时间的推移而分散剩余的信号失真，或者将其重定位到通过加窗技术衰减的时间位置。

57. 发明申请

US20130195164A1 SYSTEMS AND METHODS FOR ENHANCING AUDIO QUALITY OF FM RECEIVERS 有权
标题翻译：提高FM接收机音频质量的系统和方法
公开(公告)号：US20130195164A1
公开(公告)日：2013-08-01
申请号：US13362277
申请日：2012-01-31
申请人： Juin-Hwey Chen , Thomas F. Baker , Evan S. McCarthy , Jes Thyssen , Walter J. Wihardja , David C. Garrett
发明人： Juin-Hwey Chen , Thomas F. Baker , Evan S. McCarthy , Jes Thyssen , Walter J. Wihardja , David C. Garrett
IPC分类号： H04L27/06 , H04B17/00 , H03D1/06
CPC分类号： H04B1/1676 , H03G3/345 , H04B1/04 , H04B1/1661 , H04B1/7183 , H04S1/007 , H04S2400/09
摘要： Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, a stop band noise signal is extracted from an L+R or L−R signal produced by an FM stereo decoder. A channel quality measure is calculated based on the stop band noise signal and is used to control whether a pop suppression technique is applied to the L+R signal. The channel quality measure and the stop band noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on the L−R signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation.
摘要翻译：描述了用于增强FM接收机的音频质量的系统和方法。在本文所描述的实施例中，从由FM立体声解码器产生的L + R或L-R信号中提取阻带噪声信号。基于阻带噪声信号计算信道质量度量，并且用于控制是否对L + R信号应用流行抑制技术。信道质量测量和阻带噪声信号也被用于在L-R信号和L + R信号的频域中进行单信道噪声抑制。信道质量测量还用于控制快速衰落补偿过程的应用，其中替换了通过波形外推产生的替换波形的L-R和L + R信号的噪声段。

58. 发明申请

US20130195163A1 SYSTEMS AND METHODS FOR ENHANCING AUDIO QUALITY OF FM RECEIVERS 有权
标题翻译：提高FM接收机音频质量的系统和方法
公开(公告)号：US20130195163A1
公开(公告)日：2013-08-01
申请号：US13362244
申请日：2012-01-31
申请人： Juin-Hwey Chen , Thomas F. Baker , Evan S. McCarthy , Jes Thyssen , Walter J. Wihardja , David C. Garrett
发明人： Juin-Hwey Chen , Thomas F. Baker , Evan S. McCarthy , Jes Thyssen , Walter J. Wihardja , David C. Garrett
IPC分类号： H04B1/10 , H04B17/00 , H03D1/04
CPC分类号： H04B1/1661 , H03G3/345 , H04B1/04 , H04B1/7183
摘要： Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, quadrature L−R demodulation is applied to a composite baseband signal output by an FM demodulator to obtain an L−R noise signal. A channel quality measure is calculated based on the L−R noise signal and is used to control whether a pop suppression technique is applied to an L+R signal obtained from the composite baseband signal to detect and remove noise pulses therefrom. The channel quality measure and the L−R noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on an L−R signal obtained from the composite baseband signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation.
摘要翻译：描述了用于增强FM接收机的音频质量的系统和方法。在本文描述的实施例中，正交L-R解调被应用于由FM解调器输出的复合基带信号以获得L-R噪声信号。基于L-R噪声信号计算信道质量度量，并且用于控制是否将弹出抑制技术应用于从复合基带信号获得的L + R信号，以从其检测和去除噪声脉冲。信道质量测量和L-R噪声信号也被用于在从复合基带信号和L + R信号获得的L-R信号上对频域执行单信道噪声抑制。信道质量测量还用于控制快速衰落补偿过程的应用，其中替换了通过波形外推产生的替换波形的L-R和L + R信号的噪声段。

59. 发明授权

US08433077B2 Noise removal device and noise removal method 失效
公开(公告)号：US08433077B2
公开(公告)日：2013-04-30
申请号：US12385793
申请日：2009-04-20
申请人： Takaaki Suezawa
发明人： Takaaki Suezawa
IPC分类号： H04B1/10
CPC分类号： H03G3/345
摘要： The invention provides a noise removal device and method capable of more proper interpolation on an input signal. The noise removal device is for removing noise in an input signal and includes: a noise detector detecting noise in an IF signal and outputting a noise detection signal; an interpolation controller determining a period and amount of interpolation for noise correction processing, based on the IF signal and the noise detection signal; and a noise gate processor performing the noise correction processing on the IF signal, based on the interpolation period and amount supplied from the interpolation controller. The interpolation controller sets a predetermined first interpolation period, based on a first noise detection signal inputted from the noise detector, and redefines a second interpolation period longer than the first interpolation period when a second noise detection signal is detected within the first interpolation period.

60. 发明申请

US20120329417A1 Low Noise Amplifier Protection Using A Peak Detector 有权
标题翻译：使用峰值检测器的低噪声放大器保护
公开(公告)号：US20120329417A1
公开(公告)日：2012-12-27
申请号：US13169699
申请日：2011-06-27
申请人： Yuyu Chang , Hooman Darabi
发明人： Yuyu Chang , Hooman Darabi
IPC分类号： H04B7/00
CPC分类号： H04B1/109 , H03G3/3052 , H03G3/345 , H03G11/02
摘要： Embodiments of a radio frequency (RF) receiver implementing one or more forms of protection to protect devices of the RF receiver from in-band interferers is provided. The RF receiver includes an integrated circuit terminal configured to couple a RF signal received at an antenna to a RF signal path, and a low noise amplifier (LNA) coupled to the RF signal path and configured to amplify the RF signal to provide an amplified RF signal. To protect the LNA from in-band interferers, the RF receiver can further include one or more clamping circuits and/or an over-voltage detector to determine if a peak of the RF signal exceeds an acceptable level.
摘要翻译：提供了实现一种或多种形式的保护的射频（RF）接收机的实施例，以保护RF接收机的设备免受带内干扰。 RF接收机包括被配置为将在天线处接收的RF信号耦合到RF信号路径的集成电路终端和耦合到RF信号路径的低噪声放大器（LNA），并被配置为放大RF信号以提供放大RF 信号。为了保护LNA免受带内干扰，RF接收机还可包括一个或多个钳位电路和/或过电压检测器，以确定RF信号的峰值是否超过可接受的电平。

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