公开(公告)号：US09306523B2

公开(公告)日：2016-04-05

申请号：US14478531

申请日：2014-09-05

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

发明人： Ru Feng Du ,  Qi Yu Liu

IPC分类号： H04R3/00 ,  H03G3/34

CPC分类号： H03F1/3205 ,  H03F1/0205 ,  H03F1/305 ,  H03F3/183 ,  H03F3/185 ,  H03F3/187 ,  H03F3/211 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/45179 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2203/21106 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03G3/345 ,  H03G3/348 ,  H04R3/002

摘要： A class D amplifier receives and amplifies a differential analog signal which is then differentially integrated. Two pulse width modulators generate pulse signals corresponding to the differentially integrated analog signal and two power units generate output pulse signals. The outputs the power units are coupled to input terminals of integrators via a resistor feedback network. An analog output unit converts the pulse signals to an output analog signal. The differential integration circuitry implements a soft transition between mute/un-mute. In mute, the integrator output is fixed. During the soft transition, the PWM outputs change slowly from a fixed 50% duty cycle to a final value to ensure that no pop noise is present in the output as a result of mode change.

摘要翻译： D类放大器接收和放大差分模拟信号，然后差分模拟信号被差分地积分。 两个脉冲宽度调制器产生对应于差分集成模拟信号的脉冲信号，两个功率单元产生输出脉冲信号。 功率单元的输出通过电阻反馈网络耦合到积分器的输入端。 模拟输出单元将脉冲信号转换为输出模拟信号。 差分积分电路实现静音/非静音之间的软转换。 静音时，积分器输出是固定的。 在软转换期间，PWM输出从固定的50％占空比缓慢变化到最终值，以确保由于模式更改而导致输出中没有弹出式噪声。

公开(公告)号：US08903340B2

公开(公告)日：2014-12-02

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： H03G3/34 ,  H03G3/30 ,  H04B1/10 ,  H03G11/02

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。

公开(公告)号：US20140072143A1

公开(公告)日：2014-03-13

申请号：US13865008

申请日：2013-04-17

申请人： Polycom, Inc.

发明人： Yibo Liu ,  Peter L. Chu ,  Jeff Rodman

IPC分类号： G06F3/16

CPC分类号： G06F3/165 ,  H03G3/345

摘要： Methods and systems for cancelation of table noise in a speaker system used for video or audio conferencing are disclosed. Table noise is cancelled in one embodiment by providing a signal or a message whenever a key is depressed on a keyboard or a mouse is clicked. When the key depression signal or message is received, the system evaluates whether speech is occurring. If speech is not occurring, then the microphone in the system is muted. However, if speech is occurring, the microphone is not muted for a period of time to allow the speech to be transmitted to the far end. This allows the conference to be continued in the presence of keyboard sounds if speech is occurring at the same time but also silences the keyboard sounds if speech is not occurring.

摘要翻译： 公开了用于视频或音频会议的扬声器系统中用于消除表噪声的方法和系统。 在一个实施例中，通过在键盘上按下键或点击鼠标时提供信号或消息来消除表噪声。 当接收到按键抑制信号或消息时，系统评估是否发生语音。 如果没有发生语音，则系统中的麦克风静音。 然而，如果发生语音，则麦克风不会被静音一段时间，以允许语音被发送到远端。 这样就可以在出现语音的同时存在键盘声音的情况下继续进行会议，但是如果没有发生语音，则会使键盘声音静音。

公开(公告)号：US08498597B2

公开(公告)日：2013-07-30

申请号：US13030791

申请日：2011-02-18

申请人： Kohta Miyagi ,  Kazuo Takayama ,  Keita Taniguchi

发明人： Kohta Miyagi ,  Kazuo Takayama ,  Keita Taniguchi

IPC分类号： H04B17/00

CPC分类号： H03G3/345

摘要： To provide a broadcast receiving apparatus including an AM detector, an AM noise detector, an FM detector, an FM noise-level detector, and a threshold control unit. The AM detector performs AM detection on a broadcast signal in airwaves received by a receiving antenna that receives incoming airwaves to acquire an AM detection signal. The AM noise detector detects a signal portion, in which the AM detection signal exceeds an AM noise threshold, as an AM noise component. The FM detector performs FM detection on the broadcast signal to acquire an FM detection signal. The FM noise-level detector detects an FM noise level of the FM detection signal. When the FM noise-level detector detects the FM noise level of the FM detection signal, the threshold control unit changes setting of the AM noise threshold in the AM noise detector based on the FM noise level of the FM detection signal.

摘要翻译： 提供包括AM检测器，AM噪声检测器，FM检测器，FM噪声电平检测器和阈值控制单元的广播接收设备。 AM检测器对由接收进入的无线电波的接收天线接收的无线电波中的广播信号执行AM检测，以获取AM检测信号。 AM噪声检测器检测AM检测信号超过AM噪声阈值的信号部分作为AM噪声分量。 FM检测器对广播信号执行FM检测以获取FM检测信号。 FM噪声电平检测器检测FM检测信号的FM噪声电平。 当FM噪声电平检测器检测到FM检测信号的FM噪声电平时，阈值控制单元基于FM检测信号的FM噪声电平改变AM噪声检测器中AM噪声阈值的设置。

公开(公告)号：US07668260B2

公开(公告)日：2010-02-23

申请号：US11545960

申请日：2006-10-10

申请人： Bernard Arambepola

发明人： Bernard Arambepola

IPC分类号： H03K9/00 ,  H04L27/00 ,  H04L27/06

CPC分类号： H04B1/1036 ,  H03G3/345 ,  H04B1/1027 ,  H04L27/2647 ,  H04L27/2657 ,  H04L27/2662

摘要： In a digital receiver for receiving COFDM modulated television signals or the like, consecutive samples are compared with a detection threshold and the number of samples having amplitudes greater than the threshold is determined. This is compared with a further threshold and, if the number of such samples exceeds the further threshold, affected samples are blanked to zero. Similarly, an automatic gain control loop is disabled when the samples are blanked. A demodulator forms the difference in phase of pilot carriers from symbol to symbol. If the variance of the phase differences exceeds an averaged value, this indicates the presence of impulsive noise and is used to inhibit signal correction techniques within the demodulator. Noise energy is thus reduced and propagation of effects resulting from impulsive noise from symbol to symbol is substantially reduced.

摘要翻译： 在用于接收COFDM调制电视信号等的数字接收机中，将连续采样与检测阈值进行比较，并且确定具有大于阈值的幅度的采样数。 将其与另一阈值进行比较，并且如果这些样本的数量超过另外的阈值，则将受影响的样本置为零。 类似地，当样品被消隐时，禁用自动增益控制环路。 解调器形成导频载波从符号到符号的相位差。 如果相位差的方差超过平均值，则表示脉冲噪声的存在，并用于抑制解调器内的信号校正技术。 因此噪声能量减少，并且由脉冲噪声从符号到符号的影响的传播显着减少。

公开(公告)号：US20090262954A1

公开(公告)日：2009-10-22

申请号：US12104639

申请日：2008-04-17

申请人： Wen-Long LIN

发明人： Wen-Long LIN

IPC分类号： H03G3/20

CPC分类号： H04N5/602 ,  H03G3/345 ,  H04N21/4392 ,  H04N21/4394

摘要： An audio signal adjusting device is disclosed. The audio signal adjusting device for adjusting the amplitudes of digital audio signals received from a decoder that decodes the audio signals received from an antenna comprises a buffer, a signal abnormality detector and a fading processor. The buffer stores the digital audio signals received from the decoder. The signal abnormality detector detects the abnormality of the digital audio signals stored in the buffer and outputs a fading out enable instruction when the digital audio signals are detected as abnormal. The fading processor fades out the amplitudes of the digital audio signals stored in the buffer according to a fading out algorithm after receiving the fading out enable instruction, to output faded digital audio signals.

摘要翻译： 公开了一种音频信号调节装置。 用于调整从解码器接收的数字音频信号的幅度的音频信号调节装置，其对从天线接收的音频信号进行解码，包括缓冲器，信号异常检测器和衰落处理器。 缓冲器存储从解码器接收的数字音频信号。 当检测到数字音频信号异常时，信号异常检测器检测存储在缓冲器中的数字音频信号的异常，并输出淡出使能指令。 衰落处理器在接收到淡出使能指令之后，根据衰落算法淡出存储在缓冲器中的数字音频信号的幅度，输出褪色的数字音频信号。

公开(公告)号：US07440737B2

公开(公告)日：2008-10-21

申请号：US11215776

申请日：2005-08-30

申请人： Jie Su

发明人： Jie Su

IPC分类号： H04B1/10 ,  H04Q7/20

CPC分类号： H04B1/109 ,  H03G3/345

摘要： A noise blanker for use in a radio receiver includes an audio blanker (115) configured to mitigate impulse noise associated with a signal received by the radio receiver and a blanker controller (117) configured to selectively enable the audio blanker and further comprising at least a first blanker enabler and a second blanker enabler. The noise blanker controlled and corresponding method (500) can include a first noise detector, e.g., MPX noise detector (213), configured to provide a first signal when impulse noise is detected in a demodulated signal and a second noise detector, e.g., log RSSI noise detector (211), configured to provide a second signal when impulse noise is detected in a modulated signal, and a logic function (217) coupled to the first and second signals and configured to provide an enable signal to the noise blanker when the first signal or the second signal is provided. Note that in addition to or in lieu of either of the noise detectors, a switching enabler (215), responsive, e.g., to diversity switching controller (125) or other indications of a state change, can provide a signal to the logic function and thus enable the audio blanker.

摘要翻译： 用于无线电接收机的噪声消除器包括配置为减轻与由无线电接收机接收的信号相关联的脉冲噪声的消声器（115），以及配置成选择性地启用音频消隐器并且还包括至少一个 第一个阻塞者启动器和第二个阻塞者启动器。 噪声抑制器控制和相应的方法（500）可以包括第一噪声检测器，例如MPX噪声检测器（213），其被配置为当在解调信号中检测到脉冲噪声时提供第一信号，并且第二噪声检测器（例如，log RSSI噪声检测器（211），被配置为当在调制信号中检测到脉冲噪声时提供第二信号;以及耦合到第一和第二信号的逻辑功能（217），并被配置为当噪声消除器 提供第一信号或第二信号。 注意，除了或代替噪声检测器中的任何一个之外，响应于例如分集切换控制器（125）或状态改变的其他指示的切换使能器（215）可以向逻辑功能提供信号，并且 从而启用音频消隐器。

公开(公告)号：US07286809B2

公开(公告)日：2007-10-23

申请号：US10938073

申请日：2004-09-10

申请人： Leo Friesen ,  Reimund Rebel ,  Martin Siegle

发明人： Leo Friesen ,  Reimund Rebel ,  Martin Siegle

IPC分类号： H04B1/10

CPC分类号： H03G3/345

摘要： Noise impulses are suppressed in a signal processing circuit by gating an input signal. The gated signal is then smoothed upstream of demodulating the smoothed signal as viewed in a signal flow direction from a signal input to a processed signal output. The signal processing circuit system includes at least a signal gating section followed by a signal smoothing section followed by a demodulating section in that order and as viewed in the signal flow direction. Thus, smoothing takes place prior to demodulation.

摘要翻译： 通过选通输入信号来抑制信号处理电路中的噪声脉冲。 然后，在从信号输入到处理的信号输出的信号流动方向观察时，在解调平滑信号的上游对门控信号进行平滑。 信号处理电路系统至少包括信号选通部分，随后是信号平滑部分，随后是解调部分，并且在信号流动方向上看到。 因此，在解调之前进行平滑化。

公开(公告)号：US20070173216A1

公开(公告)日：2007-07-26

申请号：US11338526

申请日：2006-01-23

申请人： Gregory Blum

发明人： Gregory Blum

IPC分类号： H04B1/10

CPC分类号： H03G3/345 ,  H03G3/344

摘要： A method, algorithm, architecture, circuits, and/or systems for squelch detection in serial communications are disclosed. In one embodiment, a squelch detector can include: (i) a first comparator having first and second inputs configured to receive a differential signal, and a third input configured to receive a signal substantially derived from the differential signal, where the first comparator can provide a comparator output; and (ii) a second comparator that can receive the comparator output and a reference voltage, and may provide a logic level squelch indication. The third input signal may be a common reference signal that is approximately an average voltage of the differential signal, for example. The first comparator may comprise a three-input comparator and the second comparator may comprise a two-input hysteresis comparator, for example. Embodiments of the present invention can advantageously provide a reliable and simplified approach for squelch detection in serial communication applications.

摘要翻译： 公开了用于串行通信中的静噪检测的方法，算法，架构，电路和/或系统。 在一个实施例中，静噪检测器可以包括：（i）第一比较器，其具有被配置为接收差分信号的第一和第二输入，以及第三输入，被配置为接收基本上从差分信号导出的信号，其中第一比较器可以提供 比较器输出; 和（ii）可以接收比较器输出和参考电压的第二比较器，并且可以提供逻辑电平静噪指示。 例如，第三输入信号可以是大约是差分信号的平均电压的公共参考信号。 第一比较器可以包括三输入比较器，并且第二比较器可以包括例如双输入磁滞比较器。 本发明的实施例可以有利地提供用于串行通信应用中的静噪检测的可靠和简化的方法。

公开(公告)号：US07180933B2

公开(公告)日：2007-02-20

申请号：US10327271

申请日：2002-12-20

申请人： Ching-Lin Wu ,  Hsien-Feng Liu ,  Hung-Chih Liu

发明人： Ching-Lin Wu ,  Hsien-Feng Liu ,  Hung-Chih Liu

IPC分类号： H04L25/00

CPC分类号： H03G3/344 ,  H03G3/345

摘要： A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate four pre-processed signals that are paired and sent to the low swing pre-amplifier. The outputs of the low-swing pre-amplifier are then over-sampled by the sampling and decision circuit. Multi-phase clocks are used to control the over-sampling in the sampling and decision circuit. A logic circuit then determines if the state of the input signal based on multiple samples.

摘要翻译： 用于高速和高频操作的静噪电路包括静噪输入单元，低摆幅前置放大器以及采样和判定电路。 静噪输入单元对输入信号的正和负信号进行预处理，以产生配对并发送到低摆幅前置放大器的四个预处理信号。 低摆幅前置放大器的输出由采样和判定电路过采样。 多相时钟用于控制采样和判定电路中的过采样。 然后，逻辑电路基于多个采样来确定输入信号的状态。