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公开(公告)号：US5296762A
公开(公告)日：1994-03-22
申请号：US971426
申请日：1992-11-04
摘要： A bidirectional amplifier apparatus comprising a plurality of diodes located in a ring structure around an amplifier device to be switched. Each pair of diodes are spaced approximately one quarter wavelength, at the frequency to be passed, in order to maximize isolation across the "off" diode pairs. Use of transmission line devices of approximately one quarter wavelength, at a desired frequency, provide a high impedance at the desired frequency while attenuating higher frequencies where the transmission line devices length approach one half wavelength. The use of the transmission line devices also provide a ground bias for the paired diodes.
摘要翻译： 一种双向放大器装置，包括位于要切换的放大器装置周围的环形结构中的多个二极管。 每对二极管以要通过的频率间隔大约四分之一波长，以便最大限度地实现跨“截止”二极管对的隔离。 以期望的频率使用大约四分之一波长的传输线路设备以期望的频率提供高阻抗，同时衰减传输线设备长度接近二分之一波长的较高频率。 传输线路器件的使用也为配对二极管提供接地偏置。
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2.发明授权Apparatus and method for spurious signal reduction in direct-digital synthesizers 失效直接数字合成器中杂散信号减少的装置和方法
公开(公告)号：US5521533A
公开(公告)日：1996-05-28
申请号：US308033
申请日：1994-09-16
CPC分类号： H03B21/01
摘要： A synthesizer based upon direct-digital frequency synthesizer techniques of simplistic design and minimized spurious signal levels. The output signals of two frequency hopped direct-digital frequency synthesizers are combined with the resultant signal having a greatly suppressed spurious signal level due to the channel spacing variation of the spur. Alternate embodiments concern the number and functional location of digital-to-analog converters, varying the clock signal and the use of high-pass filters.
摘要翻译： 基于简单设计的直接数字频率合成器技术和最小化杂散信号电平的合成器。 两个跳频直接数字频率合成器的输出信号由于杂散信道间隔变化而与具有大大抑制的寄生信号电平的结果信号组合。 替代实施例涉及数模转换器的数量和功能位置，改变时钟信号和使用高通滤波器。
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3.发明授权Direct sequence spread spectrum communications receiver and method for efficient narrow-band signal excision 有权直接序列扩频通信接收机和方法，用于高效窄带信号切除公开(公告)号：US06477196B1
公开(公告)日：2002-11-05
申请号：US09386039
申请日：1999-08-30
IPC分类号： H04L2726
CPC分类号： H04B1/7102
摘要： A method of excising one or more narrow-band interfering signals in a direct sequence spread spectrum receiver that performs a magnitude spectral analysis on baseband signals in a detection channel to determine which frequency bins in the spectral analysis output contain the interfering narrow-band signals by comparing the magnitude of the signals in the frequency bins to a threshold. The corrupted frequency bins are determined by the signal magnitudes exceeding the threshold and band reject filters excise the narrow-band signals in the signal channel in accordance with the corrupted frequency bins.
摘要翻译： 一种在直接序列扩频接收机中切除一个或多个窄带干扰信号的方法，该接收机对检测信道中的基带信号执行幅度谱分析，以确定频谱分析输出中的哪些频率包含干扰窄带信号 将频率仓中的信号的幅度与阈值进行比较。 损坏的频率仓由超过阈值的信号幅度确定，并且带阻滤波器根据损坏的频率仓对信号通道中的窄带信号进行消除。
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4.发明授权Spread intermediate frequency radio receiver with adaptive spurious rejection 失效扩展具有自适应杂散抑制的中频无线电接收机
公开(公告)号：US5564097A
公开(公告)日：1996-10-08
申请号：US249485
申请日：1994-05-26
IPC分类号： H03D7/16 , H04B1/10 , H04B1/26 , H04B1/7136 , H04B1/715
CPC分类号： H04B1/0014 , H03D7/165 , H04B1/0003 , H04B1/001 , H04B1/0017 , H04B1/0039 , H04B1/10 , H04B1/26 , H04B1/7136 , H04B1/715 , H04B2001/71365 , H04B2001/7152
摘要： A radio receiver in which the received signal is spread and subsequently despread in order to identify unwanted signals. One embodiment of the present invention is comprised of a frequency-hopping spreading synthesizer that operates in synchronization with a despreader synthesizer such that unwanted signals are effectively suppressed based upon different spreading characteristics of the desired and undesired signals. Use of a logic device, in one case a digital signal processor, in combination with a state-level monitor allows for the reconfiguring of the receiver such that a state containing a large interferer can be removed from further signal processing.
摘要翻译： 一种无线电接收机，其中接收的信号被扩展并随后被解扩以便识别不需要的信号。 本发明的一个实施例包括与解扩器合成器同步操作的跳频扩频合成器，使得根据期望信号和不期望信号的不同扩展特性有效地抑制不需要的信号。 逻辑器件（在一种情况下是数字信号处理器）与状态级监视器的组合允许重新配置接收器，使得可以从进一步的信号处理中去除包含较大干扰源的状态。
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5.发明授权
公开(公告)号：US5081705A
公开(公告)日：1992-01-14
申请号：US374513
申请日：1989-06-29
IPC分类号： H03L7/07
CPC分类号： H03L7/07 , Y10S331/02
摘要： The present invention comprises a communication system including a number of independently operating equipment modules in which the operations of these modules are referenced to a common external signal and thereby phase synchronized in order to reduce intra-system interference. The system includes a number of phase lock loop type processing circuits one of which is associated with each equipment module for tracking the external reference signal and generating a base reference for use by module with which each processing circuit is associated. The system takes advantage of the inherent capabilities of phase lock loop circuits to provide a base reference for each equipment module which is characterized by a frequency spectrum having a reduced level of spurious signals and noise. The preferred embodiment includes components for automatically switching between internally and externally generated reference signals and for automatically converting an external reference signal to a standard frequency.
摘要翻译： 本发明包括一种包括多个独立操作的设备模块的通信系统，其中这些模块的操作参考公共的外部信号，从而相位同步以减少系统内的干扰。 该系统包括多个锁相环型处理电路，其中一个与每个设备模块相关联，用于跟踪外部参考信号，并产生与每个处理电路相关联的模块使用的基准参考。 该系统利用锁相环电路的固有能力来为每个设备模块提供基准参考，其特征在于具有降低的杂散信号和噪声水平的频谱。 优选实施例包括用于在内部和外部产生的参考信号之间自动切换并用于将外部参考信号自动转换为标准频率的组件。
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公开(公告)号：US08218781B1
公开(公告)日：2012-07-10
申请号：US11821281
申请日：2007-06-22
CPC分类号： G10K11/178 , G10K2210/11 , G10K2210/123
摘要： The present examples provide for the cancellation, or substantial reduction, of fan noise typically encountered in equipment cooling applications. Local audio nulls may be created by adjusting fan velocity and/or phase to cancel the fan noise near an operator. In a first example, phase and velocity of the fan may be controlled by feedback techniques. This technique utilizes feedback provided by a microphone located in the proximity of the operator to create an area of audio nulling of the fan noise. Local audio nulls may also be created by manipulating fan, phase and velocity by a controller that implements a process to create local audio nulls using the fixed position of equipment and the operator in the determination.
摘要翻译： 本示例提供了在设备冷却应用中通常遇到的风扇噪声的消除或显着降低。 可以通过调整风扇速度和/或相位来消除操作员附近的风扇噪音来创建本地音频零点。 在第一个例子中，风扇的相位和速度可以通过反馈技术来控制。 该技术利用位于操作者附近的麦克风提供的反馈，以产生风扇噪声的音频零陷区域。 也可以通过控制器来操纵风扇，相位和速度来创建本地音频零点，所述控制器实现使用设备的固定位置和操作者在确定中创建本地音频零点的过程。
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