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公开(公告)号：US20240022216A1
公开(公告)日：2024-01-18
申请号：US18348415
申请日：2023-07-07
申请人： NXP USA, Inc.
发明人： Gerben Willem de Jong , Jozef Reinerus Maria Bergervoet , Mark Pieter van der Heijden , Bilal Elkassir
CPC分类号： H03F1/3241 , H03F1/06 , H03F1/302
摘要： An analog amplitude pre-distortion circuit and method. The circuit includes a Radio Frequency, RF, input for receiving an RF signal. The circuit also includes an amplifier stage comprising an amplifier stage input for receiving the RF signal from the RF input, wherein the amplifier stage is operable to amplify the RF signal to produce an amplified RF signal. The circuit further includes a bias circuit. The bias circuit includes a detector stage for detecting an amplitude of the RF signal, and for producing a correction signal based on the amplitude of the RF signal. The bias circuit also includes a bias application stage coupled to the amplifier stage input.
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公开(公告)号：US20180316326A1
公开(公告)日：2018-11-01
申请号：US15769874
申请日：2016-10-21
发明人： Ian Morris , Nigel Wheatley , Nicolas Celerier
CPC分类号： H03F3/58 , B64G1/66 , H01Q1/288 , H01Q21/22 , H03F1/06 , H03F3/189 , H03F3/604 , H03F3/68 , H03F2200/258 , H03F2200/451
摘要： There is provided an electronic amplification apparatus (40) comprising a travelling wave tube amplifier (20) and a limiter (10), wherein the configuration of the amplifier (20) is optimised whilst maintaining signal linearity for operation with improved DC power efficiency at an operating point below saturation, and the limiter (10) is arranged to prevent the output power of the amplifier from going beyond a predetermined limit. This can prevent possible damage. There is also provided a multiport amplifier system (50) containing the electronic amplification apparatus (40), and a multi-feed, multi-amplifier phased array type antenna system (130) containing the electronic amplification apparatus (40), and a satellite communications system comprising the electronic amplification apparatus (40) or the multiport amplifier system (50) or the multi-feed, multi-amplifier phased array type antenna system (130).
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公开(公告)号：US20140205041A1
公开(公告)日：2014-07-24
申请号：US14342678
申请日：2012-08-21
申请人： NEC Corporation
发明人： Shinichi Hori
IPC分类号： H04L27/00
CPC分类号： H04L27/0008 , H03F1/0277 , H03F1/06 , H03F1/26 , H03F3/2173 , H03F3/2178 , H03F3/24 , H03F3/68 , H03F3/72 , H03F2200/336 , H03F2200/351 , H03F2200/408 , H03F2203/7221 , H03F2203/7236 , H03K7/08 , H04L25/4902
摘要： An RF signal generating circuit that generates, from a digital signal, an RF pulse signal to be radio-transmitted. It includes a polar converter generating an amplitude signal and a phase signal from the digital signal; a signal decomposer receiving the amplitude signal as an input signal, and generates two signals, a pulse width control signal and a residual signal; a delta sigma modulator subjecting the residual signal to delta-sigma modulation; a pulse width modulator subjecting the phase signal to pulse modulation in accordance with the pulse width control signal, and outputting a pulse phase signal; and a mixer that mixes a signal output from the delta sigma modulator and the pulse phase signal to output the RF pulse signal. The signal decomposer generates the pulse width control and residual signals if a product of a fundamental wave component of the pulse phase and residual signals equals the amplitude signal.
摘要翻译： 一种RF信号发生电路，其从数字信号产生要被无线电发送的RF脉冲信号。 它包括一个从数字信号产生幅度信号和相位信号的极化转换器; 接收振幅信号作为输入信号的信号分解器，产生两个信号，脉冲宽度控制信号和残留信号; 对所述残余信号进行Δ-Σ调制的ΔΣ调制器; 脉冲宽度调制器，根据脉冲宽度控制信号对相位信号进行脉冲调制，并输出脉冲相位信号; 以及混合器，其将来自Δ-Σ调制器的信号和脉冲相位信号混合输出RF脉冲信号。 如果脉冲相位的基波分量与残差信号的乘积等于振幅信号，则信号分解器产生脉宽控制和残差信号。
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公开(公告)号：US20140161281A1
公开(公告)日：2014-06-12
申请号：US13710690
申请日：2012-12-11
申请人： Fawad Nackvi
发明人： Fawad Nackvi
IPC分类号： H03G3/00
CPC分类号： H04R3/04 , A61F2002/765 , H03F1/06 , H03F3/181 , H03F3/189 , H03F3/66 , H03F2200/333 , H03F2200/348 , H03F2200/429 , H03F2200/451 , H03F2203/45264 , H03G5/165 , H04R1/20 , H04R1/22 , H04R1/227 , H04R1/24 , H04R1/26 , H04R9/18 , H04R11/14 , H04R15/02 , H04R17/10 , H04R25/353 , H04R25/48 , H04R25/558 , H04R2201/028 , H04R2205/021 , H04R2205/026 , H04R2227/005 , H04S7/307 , H04S2400/07
摘要： Disclosed are an apparatus and method of processing an audio signal to optimize audio for a room environment. One example method of operation may include recording the audio signal generated within a particular room environment and processing the audio signal to create an original frequency response based on the audio signal. The method may also include identifying a target sub-region of the frequency response which has a predetermined area percentage of a total area under a curve generated by the frequency response, determining whether the target sub-region is a narrow energy region, creating a filter to adjust the frequency response, and applying the filter to the audio signal.
摘要翻译： 公开了一种处理音频信号以优化房间环境的音频的装置和方法。 操作的一个示例方法可以包括记录在特定房间环境内生成的音频信号并处理音频信号以基于音频信号创建原始频率响应。 该方法还可以包括识别频率响应的目标子区域，其具有由频率响应产生的曲线下的总面积的预定面积百分比，确定目标子区域是否为窄能区域，创建过滤器 以调整频率响应，并将滤波器应用于音频信号。
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公开(公告)号：US4263617A
公开(公告)日：1981-04-21
申请号：US076776
申请日：1979-09-18
申请人： Henri Chemin , Claude Cluniat , Bernard Beltzer
发明人： Henri Chemin , Claude Cluniat , Bernard Beltzer
CPC分类号： H03F1/06 , H04N5/40 , H03F2200/198
摘要： The transmission system essentially involves separate amplification followed by a combination under predetermined conditions of relative amplitude and phase, of a carrier signal modulated by the video-frequency information and having a reduced carrier level with the same unmodulated carrier, thus permitting a considerable improvement in both efficiency and reliability of conventional transmitters.
摘要翻译： 传输系统基本上涉及在由视频频率信息调制的载波信号的相对幅度和相位的预定条件下进行单独的放大，并且具有相同的未调制载波的载波电平降低，从而允许两者的显着改善 传统发射机的效率和可靠性。
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公开(公告)号：US3248663A
公开(公告)日：1966-04-26
申请号：US26075863
申请日：1963-02-25
发明人： JACOB MARK I
CPC分类号： H03F3/217 , H03F1/0205 , H03F1/06 , H03F3/245
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公开(公告)号：US2623954A
公开(公告)日：1952-12-30
申请号：US1512448
申请日：1948-03-16
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公开(公告)号：US2554132A
公开(公告)日：1951-05-22
申请号：US68407146
申请日：1946-07-16
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