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31. 发明授权

US09722563B2 System and method for high input capacitive signal amplifier 有权
公开(公告)号：US09722563B2
公开(公告)日：2017-08-01
申请号：US15230946
申请日：2016-08-08
申请人： Infineon Technologies AG
发明人： Michael Kropfitsch , Jose Luis Ceballos
IPC分类号： H03G7/08 , H03G7/06 , H03F1/32 , H03F3/187 , H03F3/45 , H03G7/00 , H03G3/00 , H04R3/00 , H04R23/00 , H03G3/30 , H03K5/1532 , H03K5/1536 , H04R19/04
CPC分类号： H03G7/08 , H03F1/3211 , H03F3/187 , H03F3/45475 , H03F2200/555 , H03F2203/45166 , H03F2203/45526 , H03G3/002 , H03G3/3005 , H03G3/3089 , H03G7/002 , H03G7/06 , H03K5/1532 , H03K5/1536 , H04R3/00 , H04R19/04 , H04R23/00 , H04R2201/003
摘要： In accordance with an embodiment, a method includes determining an amplitude of an input signal provided by a capacitive signal source, compressing the input signal in an analog domain to form a compressed analog signal based on the determined amplitude, converting the compressed analog signal to a compressed digital signal, and decompressing the digital signal in a digital domain to form a decompressed digital signal. In an embodiment, compressing the analog signal includes adjusting a first gain of an amplifier coupled to the capacitive signal source, and decompressing the digital signal comprises adjusting a second gain of a digital processing block.

32. 发明申请

US20050164661A1 Emphasis circuit 审中-公开
标题翻译：强调电路
公开(公告)号：US20050164661A1
公开(公告)日：2005-07-28
申请号：US11042080
申请日：2005-01-26
申请人： Hong Moon
发明人： Hong Moon
IPC分类号： H03K5/125 , H03F1/34 , H03G5/00 , H03G5/12 , H03G7/08 , H03H11/04 , H04B1/62 , H04B3/04 , H04L25/02 , H04L25/03 , H04N5/14 , H04B17/02
CPC分类号： H04B1/62 , H03G5/00 , H03G5/12 , H04L25/0288
摘要： The present invention relates to an emphasis circuit, and more particularly to an emphasis circuit that can compensate for attenuating signals by applying an emphasis effect to the edges of a square wave input signal. An emphasis circuit according to the present invention adds an emphasis signal to a square wave to compensate for the attenuation of square wave signal, when the square wave signal including the emphasis signal is characterized by a wave form that maintains the original voltage level of the square wave after a predetermined falling time from a rising edge or after a predetermined rising time from a falling edge.
摘要翻译：本发明涉及一种加重电路，更具体地说，涉及一种可通过对方波输入信号的边缘施加强调效果来补偿衰减信号的加重电路。根据本发明的加重电路将加强信号加到方波上以补偿方波信号的衰减，当包括加重信号的方波信号的特征在于保持平方的原始电压电平的波形在从上升沿开始的预定下降时间之后或从下降沿起经过预定上升时间之后。

33. 发明申请

US20050163324A1 Apparatus and method of limiting power applied to a loudspeaker 有权
公开(公告)号：US20050163324A1
公开(公告)日：2005-07-28
申请号：US11087427
申请日：2005-03-23
申请人： Brian Neunaber
发明人： Brian Neunaber
IPC分类号： H03F1/52 , H03G7/08 , H03G11/04 , H04R3/00 , H03G11/00 , H04R29/00
CPC分类号： H03F1/52 , H03F3/181 , H03F2200/331 , H03F2200/447 , H03F2200/462 , H03F2200/471 , H03G7/08 , H03G11/04 , H04R3/00 , H04R3/007
摘要： A method of limiting the power applied to a loudspeaker is disclosed, in which both the voltage and current applied to the loudspeaker are measured, and instantaneous power is directly calculated and used to control the level of the input signal that drives the amplifier powering the loudspeaker. When the power applied to the loudspeaker exceeds a prescribed threshold, the input level to the power amplifier is reduced until the measured power falls below the threshold. Also disclosed is a method for indirectly determining the voice coil temperature from the loudspeaker's voltage and current and reducing power to the loudspeaker when the temperature exceeds a prescribed threshold. The power level is actively controlled to prevent damage to the loudspeaker and to minimize audibly objectionable artifacts.

34. 发明授权

US06919760B2 Linear-in-dB variable gain amplifier 失效
标题翻译：线性dB可变增益放大器
公开(公告)号：US06919760B2
公开(公告)日：2005-07-19
申请号：US10649461
申请日：2003-08-27
申请人： Shinichi Ogita , Mitsuhiko Otani
发明人： Shinichi Ogita , Mitsuhiko Otani
IPC分类号： H03F3/70 , H03F3/00 , H03G3/12 , H03G7/08 , H03F1/02
CPC分类号： H03F3/005 , H03G7/08
摘要： A linear-in-dB variable gain amplifier is provided, which approximates gain control characteristics to approximate Linear-in-dB characteristics. A gain G is determined so as to have approximate Linear-in-dB characteristics passing through the maximum value, minimum value, and intermediate value of the gain by a capacitance ratio between capacitance of a higher order capacitor string composed of n capacitors or a lower order capacitor string composed of m capacitors selectively connected in parallel to an input fixed capacitor, and capacitance of a lower order capacitor string, a first correction capacitor string composed of n capacitors, or a second correction capacitor string composed of m capacitors selectively connected in parallel to a feedback loop fixed capacitor, in accordance with a gain control signal (Code) of lower order m bits and higher order n bits.
摘要翻译：提供了一个线性dB可变增益放大器，其近似于增益控制特性以近似线性dB特性。增益G被确定为具有通过由n个电容器组成的较高阶电容器串的电容之间的电容比例，或者较低的电容，通过通过增益的最大值，最小值和中间值的近似线性dB特性由选择性地并联连接到输入固定电容器的m个电容器组成的第一阶电容器串，以及低阶电容器串的电容，由n个电容器组成的第一校正电容器串或由并联选择地并联的m个电容器组成的第二校正电容器串根据低阶m位的增益控制信号（Code）和较高阶n位，到反馈回路固定电容器。

35. 发明申请

US20050079837A1 Wireless receiver without agc 有权
标题翻译：无线接收器无agc
公开(公告)号：US20050079837A1
公开(公告)日：2005-04-14
申请号：US10501108
申请日：2002-12-16
申请人： Matthias Koenig
发明人： Matthias Koenig
IPC分类号： H04B17/40 , H03G7/08 , H03M1/18 , H04B1/28 , H04B17/02
CPC分类号： H04B1/0003 , H03G7/08 , H03M1/183 , H04B1/28
摘要： A wireless communication unit (300) incorporates a receiver comprising radio frequency circuitry (210, 220, 230, 240) for receiving a radio frequency signal and converting the radio frequency signal to a low frequency signal. A signal level adjustment circuit receives the low frequency signal and an analogue to digital converter (370), operably coupled to the signal level adjustment circuit receives an adjusted low frequency signal and providing a digital received signal. A signal processor (108) operably coupled to the analogue to digital converter (370) processes the digital received signal. The signal level adjustment circuit includes a low frequency amplifier (360) whose gain is arranged to be dependent upon a clip point of the analogue to digital converter (370).
摘要翻译：无线通信单元（300）包括用于接收射频信号并将射频信号转换为低频信号的射频电路（210,220,230,240）的接收机。信号电平调节电路接收低频信号，并且可操作地耦合到信号电平调节电路的模数转换器（370）接收经调整的低频信号并提供数字接收信号。可操作地耦合到模数转换器（370）的信号处理器（108）处理数字接收信号。信号电平调节电路包括一个低频放大器（360），其增益被设置为取决于模数转换器（370）的限幅点。

36. 发明授权

US5444785A Echo attaching circuit and audio device using the same 失效
标题翻译：回声连接电路和使用其的音频设备
公开(公告)号：US5444785A
公开(公告)日：1995-08-22
申请号：US347197
申请日：1994-11-21
申请人： Kaoru Izawa , Shigeyoshi Hayashi , Jun Hirai
发明人： Kaoru Izawa , Shigeyoshi Hayashi , Jun Hirai
IPC分类号： H03G7/08 , H04R3/00 , H03G3/00
CPC分类号： H03G7/007 , H03G7/08 , H04R3/00
摘要： An analog signal to be delayed thereby is compressed according to a monotonously increasing, convex compression function and sent to a delay circuit constituted digitally. Data of a digital value stored in a memory is read out after a constant delay time and converted into an analog signal by a D/A converter. The analog signal is expanded according to a reverse function of the compression function to restore it as an echo signal.
摘要翻译：要延迟的模拟信号根据单调增加的凸压缩功能被压缩，并被发送到数字地构成的延迟电路。存储在存储器中的数字值的数据在恒定的延迟时间之后被读出并由D / A转换器转换成模拟信号。模拟信号根据压缩功能的反向功能进行扩展，将其恢复为回波信号。

37. 发明授权

US5276764A Method and device for compressing and expanding an analog signal 失效
标题翻译：用于压缩和扩展模拟信号的方法和装置
公开(公告)号：US5276764A
公开(公告)日：1994-01-04
申请号：US713776
申请日：1991-06-12
申请人： Paul W. Dent
发明人： Paul W. Dent
IPC分类号： H03G7/08 , H03M3/02 , H04B1/64 , G10L3/02
CPC分类号： H04B1/64 , H03M3/022
摘要： A device and a method for processing an analog input signal (S) which varies widely in amplitude, such as speech, for the purpose of reducing the ratio of maximum to minimum amplitude variations of an output signal (P), after the processing, to the square root of the ratio existing before processing in order better to transmit said signal through a channel of restricted dynamic range in the presence of additive noise. The device comprises a converter (2) arranged to change the input signal (S) into a stream of integer numbers (N1,N2,N3 . . .). The numbers in the stream represent in some proportional way the instantaneous value of the input signal (S) divided by a reference voltage (R). This reference voltage (R) is generated by a smoothed amplitude measuring device (4) in proportion to the amplitude of the output signal (P) that is produced, when the number stream is reconverted to an analog signal waveform by means of a converter (6) working with a constant reference voltage. A device and a method for processing a signal of compressed amplitude variation, such as might be produced by the method and device described above, in order to produce a signal of amplitude variation restored to the normal range, being the square of the compressed range is also disclosed.
摘要翻译：为了将处理之后的输出信号（P）的最大值与最小振幅变化的比率减小到处理之后的处理模拟输入信号（S）的装置和方法，该模拟输入信号（S）的幅度变化很大，例如语音，在处理之前存在的比率的平方根，以便在存在加性噪声的情况下更好地通过受限动态范围的信道传输所述信号。该装置包括转换器（2），其被设置为将输入信号（S）改变成整数（N1，N2，N3 ...）流。流中的数字以一定比例的方式表示输入信号（S）的瞬时值除以参考电压（R）。当通过转换器将数字流重新转换为模拟信号波形时，该参考电压（R）由平滑的幅度测量装置（4）产生，与产生的输出信号（P）的幅度成比例 6）使用恒定的参考电压。为了产生恢复到作为压缩范围的平方的正常范围的幅度变化的信号，可以通过上述方法和装置产生压缩振幅变化信号的装置和方法，也披露。

38. 发明授权

US4471324A All NPN variably controlled amplifier 失效
标题翻译：所有NPN可变控制放大器
公开(公告)号：US4471324A
公开(公告)日：1984-09-11
申请号：US340878
申请日：1982-01-19
申请人： David R. Welland
发明人： David R. Welland
IPC分类号： H03G3/12 , H03G1/00 , H03G3/02 , H03G3/30 , H03G7/00 , H03G7/08
CPC分类号： H03G1/0005 , H03G7/002
摘要： A signal gain controlled system comprises an operational amplifier including a feedback path between the input and output terminals of the amplifier. The system includes first variable impedance means for varying the output voltage at the output terminal of the amplifier in response to and as a function of the input current signal applied to the input terminal and a first control signal. A signal path coupled between the output terminal of the operational amplifier and the output terminal of the system includes second variable impedance means for varying the output current of the system in response to and as a function of (a) the output voltage at the output of the amplifier and (b) a second control signal. The signal gain of the system is a function of the ratio of the second and first control signals.The preferred amplifier is the type having an input resistance and a feedback resistance, wherein at least one of the resistances includes a transistor which is biased to operate in its saturated region. The gain of the amplifier is a function of the control signal applied to the base of the saturated transistor.The signal gain controlled system can be utilized with a level sensing detector to provide signal compression or expansion.
摘要翻译：信号增益控制系统包括运算放大器，其包括放大器的输入和输出端之间的反馈路径。该系统包括用于响应于并且作为施加到输入端的输入电流信号和第一控制信号而改变放大器输出端的输出电压的第一可变阻抗装置。耦合在运算放大器的输出端和系统的输出端之间的信号通路包括第二可变阻抗装置，用于响应于（a）输出端的输出电压而改变系统的输出电流放大器和（b）第二控制信号。系统的信号增益是第二和第一控制信号的比率的函数。优选的放大器是具有输入电阻和反馈电阻的类型，其中至少一个电阻包括被偏置以在其饱和区域中工作的晶体管。放大器的增益是施加到饱和晶体管基极的控制信号的函数。信号增益控制系统可以与电平检测检测器一起使用，以提供信号压缩或扩展。

39. 发明授权

US4170720A AGC circuit particularly for a hearing aid 失效
标题翻译： AGC电路专门用于助听器
公开(公告)号：US4170720A
公开(公告)日：1979-10-09
申请号：US883180
申请日：1978-03-03
申请人： Mead C. Killion
发明人： Mead C. Killion
IPC分类号： H03G7/08 , H04R25/00 , H03F1/34
CPC分类号： H04R25/356 , H03G7/08 , H04R25/502
摘要： A high fidelity hearing aid is disclosed for providing high quality sound and is primarily directed to those users whose hearing loss is such that they need some amplification for low level signals, but do not need amplification for high level signals.
摘要翻译：公开了一种用于提供高质量声音的高保真助听器，并且主要针对那些其听力损失为低电平信号需要一些放大但不需要对高电平信号进行放大的用户。

40. 发明授权

US4119922A Circuit for automatic volume compression or volume expansion 失效
标题翻译：用于自动音量压缩或音量扩展的电路
公开(公告)号：US4119922A
公开(公告)日：1978-10-10
申请号：US791134
申请日：1977-04-26
申请人： Ernst Schroder
发明人： Ernst Schroder
IPC分类号： H03G7/00 , H03G7/08 , H03G3/20
CPC分类号： H03G7/08 , H03G7/004
摘要： The circuit includes a signal path extending between an information signal input terminal and an information signal output terminal. A differential amplifier, having a non-inverting input and an inverting input, is included in the signal path, and a feedback path, containing electronically controlled impedance, connects the amplifier inverting input to the amplifier output. A branch path is branched off from the information signal output terminal and, in this branch path, a control voltage is derived from the information signal and fed to the electronically controllable impedance. In accordance with the invention, the information signal input terminal is connected to the non-inverting amplifier input to feed the information signal thereto. Two diodes are connected in parallel with each other, but in oppositely poled relation, across the feedback circuit, to limit the feedback voltage between the amplifier output and the amplifier inverting input. The circuit may be used in a so-called compander system, in which the control voltage is fed to a differential amplifier in the branch path having an inverting input connected, over a feedback path containing a second electronically controllable impedance to its output, and with the control voltage being fed to the second electronically controllable impedance. In this second differential amplifier, arranged in the branch path, the information signals are also supplied to the non-converting input thereof, and the feedback voltage between the output and the inverting input is limited to a given value.
摘要翻译：电路包括在信息信号输入端和信息信号输出端之间延伸的信号路径。具有非反相输入和反相输入的差分放大器包括在信号路径中，并且包含电子控制阻抗的反馈路径将放大器反相输入连接到放大器输出。分支路径从信息信号输出端分支，并且在该分支路径中，从信息信号导出控制电压并馈送到电子可控阻抗。根据本发明，信息信号输入端子连接到非反相放大器输入端以将信息信号馈送到其中。两个二极管彼此并联连接，但是在相反的极化关系中，跨越反馈电路，以限制放大器输出和放大器反相输入之间的反馈电压。该电路可以用在所谓的压缩扩展系统中，其中控制电压被馈送到具有反相输入的分支路径中的差分放大器，反相输入端通过包含第二电子可控阻抗的反馈路径连接到其输出端，并且与控制电压被馈送到第二电子可控阻抗。在该第二差分放大器中，布置在分支路径中的信息信号也被提供给其非转换输入，并且输出和反相输入之间的反馈电压被限制在给定的值。

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