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81. 发明授权

US5003556A Squelch circuit 失效
标题翻译：静噪电路
公开(公告)号：US5003556A
公开(公告)日：1991-03-26
申请号：US375036
申请日：1989-06-30
申请人： Robert A. Curtis , William C. Mallard, Jr.
发明人： Robert A. Curtis , William C. Mallard, Jr.
IPC分类号： H03G3/34 , H03K5/125 , H04B1/10 , H04L7/04 , H04L25/06
CPC分类号： H03G3/345 , H03K5/125 , H04B1/10 , H04L25/069 , H04L7/046
摘要： A squelch circuit is disclosed that distinguishes between noise impulses and valid packets of data transmitted over a transmission line such as a twisted pair media within a local area network. The squelch circuit converts supplied data into a stream of positive and negative pulses and detects a sequence of positive and negative pulses quantified in time based on prior knowledge of the characteristics of a valid packet of data and permits the supplied data to pass if it has the characteristics of a valid packet of data or prohibits the supplied data from passing if it does not have the characteristics of a valid packet of data.
摘要翻译：公开了一种静噪电路，其区分噪声脉冲和通过诸如局域网内的双绞线媒体的传输线传输的有效数据分组。静噪电路将提供的数据转换成正脉冲和负脉冲流，并且基于有效数据分组的特征的先验知识来检测在时间上定量的正脉冲和负脉冲的序列，并允许所提供的数据如果具有如果不具有有效的数据分组的特征，则有效数据分组的特征或者禁止所提供的数据通过。

82. 发明授权

US4975963A Muting circuit 失效
标题翻译：静音电路
公开(公告)号：US4975963A
公开(公告)日：1990-12-04
申请号：US776089
申请日：1985-09-13
申请人： Zvie Liberman
发明人： Zvie Liberman
IPC分类号： H03F1/30 , H03G3/34
CPC分类号： H03F1/305 , H03G3/34 , H03G3/348
摘要： A muting circuit for a transconductance amplifier has a switch connected across the signal load of the amplifier to short circuit the output.
摘要翻译：跨导放大器的静噪电路具有连接在放大器的信号负载之间的开关，以使输出短路。

83. 发明授权

US4947431A Held music history circuit 失效
标题翻译：举行音乐历史电路
公开(公告)号：US4947431A
公开(公告)日：1990-08-07
申请号：US406900
申请日：1989-09-13
申请人： Richard S. Stroud , Fred J. Anderson , Matthew C. Reprogle , Douglas E. White , Jeffrey J. Marrah , Gregory J. Manlove
发明人： Richard S. Stroud , Fred J. Anderson , Matthew C. Reprogle , Douglas E. White , Jeffrey J. Marrah , Gregory J. Manlove
IPC分类号： H03G3/34
CPC分类号： H03G3/345
摘要： A circuit is provided which gauges the amount of significant high-frequency spectral energy in the very recent history of the program material and ignores the effects of short noise bursts and other transients associated with FM reception in the moving vehicle. The circuit provides an output voltage which can be used to adjust the attack characteristics of an audio processor.
摘要翻译：提供了一种电路，其在节目材料的最近历史中测量显着的高频光谱能量的量，并且忽略了在移动车辆中与FM接收相关联的短噪声突发和其它瞬变的影响。该电路提供可用于调整音频处理器的攻击特性的输出电压。

84. 发明授权

US4924192A Adjusting apparatus for adjusting sound volume or sound quality 失效
标题翻译：用于调节音量或音质的调节装置
公开(公告)号：US4924192A
公开(公告)日：1990-05-08
申请号：US338073
申请日：1989-04-14
申请人： Yoshio Sasaki
发明人： Yoshio Sasaki
IPC分类号： H03G5/02 , H03G3/00 , H03G3/02 , H03G3/04 , H03G3/34 , H03K17/13
CPC分类号： H03G3/001 , H03G3/04 , H03G3/348
摘要： An adjusting apparatus for adjusting sound volume or sound quality of a signal reproduced from a music source in which an electronic volume section has a group of analog switches. The apparatus includes a signal generating means which generates a signal for switching the group of analog switches at the approximately zero-cross point of the reproduced signal of the music source.

85. 发明授权

US4910799A Noise reduction apparatus 失效
标题翻译：降噪装置
公开(公告)号：US4910799A
公开(公告)日：1990-03-20
申请号：US406862
申请日：1989-09-12
申请人： Kazuo Takayama
发明人： Kazuo Takayama
IPC分类号： H03G3/34 , H03G5/00 , H04B1/10
CPC分类号： H03G5/00 , H03G3/34 , H04B1/1027 , H04B1/1081
摘要： A noise reduction apparatus in which an input signal is supplied to a first signal path (2) including a variable low-pass filter (2) and a second signal path (1), a control circuit (4) control is such that a cut-off frequency of the variable low-pass filter (2) is varied in accordance with a frequency of the input signal S(1), and an output signal is obtained from the first signal path when noise is generated and from the second signal path when noise is not generated.

86. 发明授权

US4893347A FM communication system with improved response to Rayleigh-faded companded signals 失效
标题翻译： FM通信系统对瑞利衰落的压缩信号的响应改善
公开(公告)号：US4893347A
公开(公告)日：1990-01-09
申请号：US90982
申请日：1987-08-28
申请人： Bruce C. Eastmond , Donald L. Linder
发明人： Bruce C. Eastmond , Donald L. Linder
IPC分类号： H04B1/10 , H03G3/20 , H03G3/34 , H04H20/67
CPC分类号： H03G3/3052 , H03G3/344 , H03G3/345 , H04B1/1027 , H04H20/67
摘要： An improved FM companding communication system is disclosed in which noise bursts and pops in the audio output of the receiver, due to weak and Rayleigh-faded signals, are minimized by selectively attenuating the audio signal in the receiver prior to expansion. The amount and rate of attenuation for the noise reduction circuits is determined by a control signal derived from either the average discriminator noise at frequencies above 3 kHz, or from a received RF signal strength indicator, or a combination of both. The audio output is attenuated during weak signals or Rayleigh fades only when the attenuation control signal increases above a predetermined signal-to-noise ratio threshold. Preferably, attenuation increases at a rate greater than the decrease in the received signal strength. The invention includes a circuit for modifying the expansion characteristics of the expandor to minimize signal clipping in the output audio stage of the receiver due to limited dynamic range.
摘要翻译：公开了一种改进的FM压扩通信系统，其中由于弱和瑞利衰落的信号，接收机的音频输出中的噪声突发和流行通过在扩展之前选择性地衰减接收机中的音频信号来最小化。噪声降低电路的衰减量和速率由通过频率高于3kHz的平均鉴别器噪声或接收到的RF信号强度指示符或两者的组合导出的控制信号确定。只有当衰减控制信号增加到高于预定的信噪比阈值时，音频输出在弱信号或瑞利衰减期间被衰减。优选地，衰减以大于接收信号强度的降低的速率增加。本发明包括用于修改扩展器的扩展特性的电路，以使接收机的输出音频级中的信号限幅最小化，这是由于有限的动态范围。

87. 发明授权

US4885799A Load pull isolation switch for a fast locking synthesizer 失效
标题翻译：用于快速锁定合成器的负载拉脱离开关
公开(公告)号：US4885799A
公开(公告)日：1989-12-05
申请号：US69796
申请日：1987-07-01
申请人： Mark I. Van Horn
发明人： Mark I. Van Horn
IPC分类号： H03G3/34 , H04B1/44
CPC分类号： H04B1/44 , H03G3/341 , Y10T307/469 , Y10T307/766
摘要： A load pull isolation switch for a signal source is discolsed which substantially eliminates the effects of load pull caused by a variable impedance load when selectively coupled and decoupled to a signal source. By judiciously choosing the timing criteria for activating the isolation switch, convention load pull isolation stages are eliminated.In another embodiment, the load pull isolation switch is disclosed as incorporated in a mobile radio having a fast locking synthesizer. The timing of the operation of the isolation switch is controlled by a microprocessor-controller which not only handles data and control functions for the mobile radio, but also has the necessary method steps incorporated as software within the microprocessor-controller. Such an arrangement is useful for sending voice or data as in a time division multiplex system.
摘要翻译：用于信号源的负载拉脱离开关被拆解，当选择性地耦合和去耦合到信号源时，基本上消除了由可变阻抗负载引起的负载拉动的影响。通过明智地选择激活隔离开关的时序标准，消除了常规的负载拉动隔离级。在另一个实施例中，公开了将负载牵引隔离开关结合在具有快速锁定合成器的移动无线电中。隔离开关的操作时间由微处理器控制器控制，微处理器控制器不仅处理移动无线电的数据和控制功能，而且还具有作为微处理器控制器内的软件组装的必要的方法步骤。这样的布置对于在时分复用系统中发送语音或数据是有用的。

88. 发明授权

US4856084A Noise blanking system for an AM radio receiver 失效
标题翻译： AM无线电接收机的噪声消隐系统
公开(公告)号：US4856084A
公开(公告)日：1989-08-08
申请号：US156049
申请日：1988-02-16
申请人： Oliver L. Richards, Jr.
发明人： Oliver L. Richards, Jr.
IPC分类号： H04B1/26 , H03G3/34 , H04B1/10
CPC分类号： H03G3/345 , H04B1/10
摘要： To a standard AM radio receiver there is connected an impulse-noise suppression system comprising a preliminary blanking gate adapted for connecting to and for interrupting the AM-modulated signal path at the input of the IF section, and an audio blanking gate adapted for interrupting the audio circuit. Both blanking circuits detect impulse noise at the RF amplifier and with appropriate delays blank both points. Audio blanking masks the audio disturbance caused by the blanking in the AM-modulated-signal path. Audio blanking time is preferably from 2 to 3 times the duration of the blanking of the AM-modulated-signal path and is thus kept very short causing a minimum interruption of the wanted audio signal. Associated with the audio-signal-path blanking circuit is a sample and hold circuit for smoothing the blanked audio signal and virtually eliminating an audio disturbance or noise that is otherwise generated by the audio blanking circuit itself.
摘要翻译：对于标准AM无线电接收机，连接有脉冲噪声抑制系统，其包括适于连接到IF部分的输入处并用于中断AM调制信号路径的预置消隐门，以及适于中断音频电路。两个消隐电路都检测到RF放大器的脉冲噪声，并且适当的延迟将空白两个点。音频消隐屏蔽由AM调制信号路径中的消隐引起的音频干扰。音频消隐时间优选地是AM调制信号路径的消隐的持续时间的2到3倍，因此保持非常短，导致所需音频信号的最小中断。与音频信号路径消隐电路相关联的是用于平滑消隐音频信号并且实际上消除由音频消隐电路本身产生的音频干扰或噪声的采样和保持电路。

89. 发明授权

US4704736A Method and apparatus for reducing interference in broadcast receiver 失效
标题翻译：减少广播接收机干扰的方法和装置
公开(公告)号：US4704736A
公开(公告)日：1987-11-03
申请号：US808855
申请日：1985-12-13
申请人： Jurgen Kasser
发明人： Jurgen Kasser
IPC分类号： H04B1/10 , H03G3/34
CPC分类号： H03G3/345
摘要： For elimination of pulse type interference in an FM receiver by intermittent blanking of the received signal while interfering pulses are present and substitution of a synthetic signal during the blanking intervals, the synthetic signal substituted during the blanking intervals is produced by interpolation using finite duration impulse response digital filters, instead of using the last undisturbed value of the received signal modified by integration of its last value of rate of change with respect to time. The determination of the blanking interval is optimized by reference to the maximum and minimum peak values of the output of an AM detector of the received signal and comparing an interference signal magnitude thus obtained with a threshold value of the interference signal, so as to define the blanking interval as the interval during which the interference signal exceeds the reference signal value. The interference signal compared with the reference value is produced by computing the sum and product of the maximum and minimum peak values, adding the product to the output of the squarer operating on the output of the AM demodulator, multiplying the sum of the maximum and minimum peak values by the AM demodulator output, dividing the product plus squarer sum by the multiplied output of the AM demodulator, forming the arc cosine of the output of the divider and then differentiating the arc cosine value.
摘要翻译：为了消除FM接收机中的脉冲类型干扰，通过间歇性消隐接收到的信号同时存在干扰脉冲，并且在消隐间隔期间代替合成信号，则在消隐间隔期间替换的合成信号通过使用有限持续时间脉冲响应数字滤波器，而不是通过将其最近的变化率值相对于时间整合而修改的接收信号的最后未受干扰的值。通过参考接收信号的AM检测器的输出的最大和最小峰值来优化消隐间隔的确定，并将由此获得的干扰信号幅度与干扰信号的阈值进行比较，以便定义消隐间隔作为干扰信号超过参考信号值的间隔。与参考值相比较的干扰信号是通过计算最大和最小峰值的和和乘积来产生的，将乘积加到在AM解调器的输出上工作的平方的输出，乘以最大和最小值之和通过AM解调器输出的峰值，将乘积加平方和和乘以AM解调器的乘法输出，形成分频器输出的反余弦，然后区分反余弦值。

90. 发明授权

US4703507A Noise reduction system 失效
标题翻译：降噪系统
公开(公告)号：US4703507A
公开(公告)日：1987-10-27
申请号：US890617
申请日：1986-07-25
申请人： Thomas W. Holden
发明人： Thomas W. Holden
IPC分类号： H03G3/34 , H04B1/10 , H04B15/00
CPC分类号： H03G3/341
摘要： A noise reduction system and method for reducing noise occurring during pauses in information bearing audio signals has an audio input connected to one input of a differential output circuit. A variable gain circuit has an input connected to the audio input and an output connected to the other input of the differential circuit. A dc control signal is derived from the incoming signals and controls the variable gain circuit to cause cancellation of a noise only signal during periods of no information bearing audio signals.
摘要翻译：用于降低在信息承载音频信号中的暂停期间发生的噪声的降噪系统和方法具有连接到差分输出电路的一个输入的音频输入。可变增益电路具有连接到音频输入的输入和连接到差分电路的另一个输入的输出。从输入信号导出直流控制信号，并且控制可变增益电路，以在没有信息承载音频信号的时段期间引起仅噪声信号的消除。

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