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公开(公告)号：US09257951B2
公开(公告)日：2016-02-09
申请号：US13891615
申请日：2013-05-10
申请人： Red Lion 49 Limited
发明人： David Joseph Mate
CPC分类号： H03G1/00 , H03F3/183 , H03F3/45098 , H03F3/45502 , H03F2200/411 , H03F2203/45682 , H03G1/0023 , H03G1/0029 , H03G3/001 , H03G3/301 , H03G5/14
摘要： An amplifier for amplifying a differential audio signal, having common-mode rejection and digital gain control, includes a current source (401) which supplies a constant level of current to a first current path (I1) and a second current path (I2), and input stage (403) which modulates the current in the current paths in response to a differential input signal, and an output stage (405) which produces an output signal by amplifying the difference in current between the current paths, a degree of feedback provided to the input stage by a feedback stage (402) that modulates the current in the current paths in response to the output signal, and the degree of modulation by the feedback stage is determined by the attenuation provided by at least one multiplying digital-to-analog converter (407) located therein.
摘要翻译： 用于放大具有共模抑制和数字增益控制的差分音频信号的放大器包括向第一电流路径（I1）和第二电流路径（I2）提供恒定电平的电流源（401） 以及输入级（403），其响应于差分输入信号调制电流路径中的电流;以及输出级（405），其通过放大电流路径之间的电流差产生输出信号，提供反馈程度 通过响应于输出信号调制电流路径中的电流的反馈级（402）到达输入级，并且由反馈级的调制程度由至少一个乘法数字 - 模拟转换器（407）。
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公开(公告)号：US4210942A
公开(公告)日：1980-07-01
申请号：US883155
申请日：1978-03-03
摘要： In a video signal play-back circuit connected so that a play-back signal from a magnetic head may be applied to an amplifier circuit through a resonance circuit which consists of an inductance element and a capacitance element, a resistor for adjusting the quality factor Q of the resonance circuit is connected between one terminal of the resonance circuit and one output terminal of the amplifier circuit, thereby to reduce thermal noises which develop from the Q adjusting resistor.
摘要翻译： 在连接使得来自磁头的回放信号可以通过由电感元件和电容元件构成的谐振电路施加到放大器电路的视频信号回放电路中，用于调节质量因子Q 谐振电路的一端与放大电路的一个输出端连接，从而减少由Q调整电阻产生的热噪声。
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公开(公告)号：US3991374A
公开(公告)日：1976-11-09
申请号：US553278
申请日：1975-02-26
申请人： Antal Csicsatka , Henry P. Lee
发明人： Antal Csicsatka , Henry P. Lee
摘要： Controllable bandwidth IF filter circuit for radio receivers generally, but having particular application to quadraphonic radio receivers intended for use in a quadraphonic system that is compatible with existing monophonic and biphonic equipment, said filter circuit being automatically adjusted in a digital manner to exhibit one of several different bandwidths in response to a pair of transmitted control signals present in the quadraphonic transmission so as to provide optimum receiver operation for the particular mode of broadcast being received, especially in terms of an improved protection ratio and signal to noise ratio for the received signal. The noted bandwidth adjustments are accomplished by modifying the values for certain of the component in the filter's tuned circuit and coupling sections through their selective connection into the circuit by means of semiconductor switching devices operated in response to said pair of control signals.
摘要翻译： 通常用于无线电接收机的可控带宽IF滤波器电路，但是具有专门应用于与现有单声道和双声道设备兼容的四音系统中的四声道无线电接收机的特定应用，所述滤波器电路以数字方式自动调整以呈现几个 响应于在第四传输中存在的一对传输的控制信号的不同带宽，以便为接收的特定的广播方式提供最佳的接收机操作，特别是在接收信号的改进的保护比和信噪比方面。 通过通过响应于所述一对控制信号而操作的半导体开关装置，通过将滤波器的调谐电路中的某些分量的值修改并通过其选择性连接到电路中来实现所述带宽调整。
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公开(公告)号：US3569852A
公开(公告)日：1971-03-09
申请号：US3569852D
申请日：1969-01-23
发明人： BERKOVITS BAROUH V
IPC分类号： G01R13/20 , A61B5/04 , A61B5/0428 , A61B5/0432 , H03F1/26 , H03G5/14 , H03G5/16 , H03G5/18
CPC分类号： H03F1/26 , A61B5/04004 , A61B5/0432 , H03G5/14 , H03G5/18 , Y10S128/901
摘要： An amplifier for an electrocardiographic monitoring system. The band-pass of the amplifier is such that ordinarily all frequency components of the ECG signal are amplified to the same extent. In the presence of a low frequency noise signal which causes the output voltage to exceed a maximum limit in either direction, the low frequency 3-db. point is raised from .05 Hertz to 1.0 Hertz. This is achieved simply by lowering the time constant of a high pass filter in the amplifier. The shorter time constant reduces the effect of low frequency noise on the output voltage. While some of the low frequency components in the ECG signal are attenuated, most of the usable information in the signal is retained. The shorter time constant also provides a faster recovery for the amplifier following large direct current voltage changes. This is especially beneficial when the patient electrodes of the monitoring system are switched and they induce a charge in the DC component of the ECG signal which might saturate the ECG preamplifier. Similarly, in the presence of high frequency noise signals the high frequency 3-db. point is lowered for a similar purpose.
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5.发明授权公开(公告)号：US10522125B2
公开(公告)日：2019-12-31
申请号：US15759767
申请日：2016-08-12
发明人： Steven M. Fryette , Bruce Egnater
摘要： An exemplary modular musical instrument amplification system may comprise a chassis including a power supply, an input gain stage, a control processor and a plurality of modular slots. The modular slots are configured to receive any of a plurality of preamplifier modules for establishing an electrical communication therewith. The input gain stage has a modifiable response behavior and is in signal amplifying communication between at least one instrument input jack and the modular slots. The control processor is preferably in control communication between the modular slots and the input gain stage. Each preamplifier module has a respective input stage profile associated therewith. The control processor may be configured for sensing the input stage profile of a preamplifier module received in an active modular slot, and setting the response behavior based, at least in part, upon the respective input stage profile.
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公开(公告)号：US5499394A
公开(公告)日：1996-03-12
申请号：US249642
申请日：1994-05-25
申请人： Gary F. Kaatz , John E. Becker
发明人： Gary F. Kaatz , John E. Becker
摘要： A filter switching circuit for switching between two or more filters. The filter switching circuit may be integrally formed upon an integrated circuit chip and may be advantageously utilized as a portion of a dual bandwidth receiver, such as employed in a radiotelephone, operable to receive both narrowband and wideband signals.
摘要翻译： 一种用于在两个或更多个滤波器之间切换的滤波器切换电路。 滤波器切换电路可以一体地形成在集成电路芯片上，并且可以有利地用作双带宽接收机的一部分，诸如在无线电话中使用的，可操作以接收窄带和宽带信号。
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公开(公告)号：USRE32132E
公开(公告)日：1986-04-29
申请号：US394640
申请日：1982-07-01
摘要： In a video signal play-back circuit connected so that a play-back signal from a magnetic head may be applied to an amplifier circuit through a resonance circuit which consists of an inductance element and a capacitance element, a resistor for adjusting the quality factor Q of the resonance circuit is connected between one terminal of the resonance circuit and one output terminal of the amplifier circuit, thereby to reduce thermal noises which develop from the Q adjusting resistor.
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公开(公告)号：US3956719A
公开(公告)日：1976-05-11
申请号：US523482
申请日：1974-11-13
申请人： Toshihiko Waku , Hiroshi Takeuchi
发明人： Toshihiko Waku , Hiroshi Takeuchi
摘要： A variable band pass filter circuit utilizing first and second ceramic filters including a pair of passive circuits that can be selectively connected between the ceramic filters and wherein the first passive circuit comprises a first capacitor connected between the output of the first ceramic filter and the input of the second ceramic filter and the second passive circuit includes a second capacitor connectable between the output of the first ceramic filter and the input of the second ceramic filter and an inductor connected between the input of the second ceramic filter and a reference point.
摘要翻译： 一种利用第一和第二陶瓷滤波器的可变带通滤波器电路，包括可以选择性地连接在陶瓷滤波器之间的一对无源电路，其中第一无源电路包括连接在第一陶瓷滤波器的输出端和第 第二陶瓷滤波器和第二无源电路包括可连接在第一陶瓷滤波器的输出端和第二陶瓷滤波器的输入端之间的第二电容器和连接在第二陶瓷滤波器的输入端和参考点之间的电感器。
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9.发明申请公开(公告)号：US20190051273A1
公开(公告)日：2019-02-14
申请号：US15759767
申请日：2016-08-12
发明人： Steven M. Fryette , Bruce Egnater
CPC分类号： G10H1/0091 , G10H1/348 , G10H3/186 , H03G5/025 , H03G5/14
摘要： An exemplary modular musical instrument amplification system may comprise a chassis including a power supply, an input gain stage, a control processor and a plurality of modular slots. The modular slots are configured to receive any of a plurality of preamplifier modules for establishing an electrical communication therewith. The input gain stage has a modifiable response behavior and is in signal amplifying communication between at least one instrument input jack and the modular slots. The control processor is preferably in control communication between the modular slots and the input gain stage. Each preamplifier module has a respective input stage profile associated therewith. The control processor may be configured for sensing the input stage profile of a preamplifier module received in an active modular slot, and setting the response behavior based, at least in part, upon the respective input stage profile.
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公开(公告)号：US10175105B2
公开(公告)日：2019-01-08
申请号：US15212790
申请日：2016-07-18
发明人： Nico Presser , Martin Mueller
摘要： A laser scanning microscope for laser scanning a sample is provided. The laser scanning microscope includes a scanner that is operated at a predefined scanning speed and that is configured to change a direction of illumination light generated to illuminate the sample. A detector is configured to detect light that is returned from the sample and an amplifier assembly is connected to the detector and is configured to amplify a detection signal that is generated by the detector. The amplifier assembly includes an adjustable capacitor and a capacitance of the adjustable capacitor is adjusted depending on the scanning speed of the scanner.
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