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    • 2. 发明授权
    • Device for varying the cutoff frequency of a low-pass filter
    • 用于改变低通滤波器的截止频率的装置
    • US5995817A
    • 1999-11-30
    • US900932
    • 1997-07-25
    • Jurgen LubbePeter KirchlechnerJorg Schambacher
    • Jurgen LubbePeter KirchlechnerJorg Schambacher
    • H04B1/10H03G5/22H04B1/06
    • H03G5/005H03G5/22
    • For eliminating the emphasis given an audio signal in the transmitter, an audio signal processor of an audio device (e.g., a car radio) contains a low-pass filter. In order to attenuate the spurious higher-frequency signal fractions in case of poor reception and accordingly low received field strength, the cutoff frequency of the low-pass filter is shifted in the direction of lower frequencies in accordance with a received field strength signal when the field strength becomes lower. In order to avoid external adjusting components and save pins on the IC chip, the field strength signal is supplied to an analog-to-digital converter and the latter supplies a digital signal to a low-pass filter whose cutoff frequency is variable. For this purpose the low-pass filter contains a number of integrated components one of which is connected or disconnected by a digit place of the digital signal in each case.
    • 为了消除在发射机中给出音频信号的强调,音频设备(例如,汽车无线电)的音频信号处理器包含低通滤波器。 为了在接收不良的情况下衰减寄生的较高频率信号分数,因此在较低的接收场强下,根据接收的场强信号,低通滤波器的截止频率根据接收的场强信号在低频的方向上移位, 场强变低。 为了避免外部调整部件并在IC芯片上节省引脚,场强信号被提供给模数转换器,后者将数字信号提供给截止频率可变的低通滤波器。 为此,低通滤波器包含多个集成组件,其中一个组件在每种情况下都由数字信号的数字位置连接或断开。
    • 5. 发明授权
    • Filter circuit and audio signal processor provided therewith
    • 滤波器电路和音频信号处理器
    • US5953430A
    • 1999-09-14
    • US900606
    • 1997-07-25
    • Peter KirchlechnerJorg SchambacherJurgen Lubbe
    • Peter KirchlechnerJorg SchambacherJurgen Lubbe
    • H03H19/00H03G5/00H03G5/02H03G9/00H03B1/00
    • H03G5/02H03G5/00
    • A filter circuit adjustably decreases or increases the amplitude of audio signals in a predetermined frequency range. The filter circuit includes a filter module having an RC network with at least one frequency-response-determining RC member whose resistor component R is realized in SC technology. A setting device is connected to the filter module such that its setting determines the frequency response of the SC filter. The setting device renders possible a neutral setting in which the effective audio signal path of the filter circuit circumvents the filter module so that no decrease or increase of the amplitude of individual frequency portions takes place. Furthermore, an audio signal processor comprises at least one audio signal input, at least one audio signal output, and at least one control input. The audio signal processor also comprises an audio signal processing unit connected between the audio signal input and the audio signal output, with the audio signal processing unit having at least one such filter circuit.
    • 滤波器电路在预定频率范围内可调节地降低或增加音频信号的幅度。 滤波器电路包括具有RC网络的滤波器模块,其具有至少一个频率响应确定RC部件,其电阻器部件R以SC技术实现。 设置装置连接到滤波器模块,使其设置确定SC滤波器的频率响应。 设置装置使得中性设置成为可能,其中滤波器电路的有效音频信号路径绕过滤波器模块,使得不会发生单个频率部分的振幅的降低或增加。 此外,音频信号处理器包括至少一个音频信号输入,至少一个音频信号输出和至少一个控制输入。 音频信号处理器还包括连接在音频信号输入和音频信号输出之间的音频信号处理单元,音频信号处理单元具有至少一个这样的滤波器电路。
    • 6. 发明授权
    • Apparatus for continuously switching a demodulator from stereo operation
to mono operation, and vice versa
    • 用于将解调器从立体声操作连续切换到单声道操作的装置,反之亦然
    • US5920632A
    • 1999-07-06
    • US900608
    • 1997-07-25
    • Jurgen LubbePeter KirchlechnerJorg Schambacher
    • Jurgen LubbePeter KirchlechnerJorg Schambacher
    • H04S7/00H04B1/16H04H20/88H04S1/00H04H5/00
    • H04B1/1676H04S1/007
    • In a stereo decoder, channel separation takes place with the aid of a demodulator to acquire signals for stereo operation. At low received field strength there is a continuous switchover to mono operation for each channel in the demodulator. For this purpose a switch is located in a signal path between input and output of the demodulator and driven by a PWM signal whose pulse-width repetition rate determines whether solely mono operation, solely stereo operation or a mixture of the two takes place. For generating the PWM signal, the field strength signal is compared with a triangular signal. To permit the switchover points between stereo and mono operation to be aligned by the manufacturer in accordance with the amplitude of the field strength signal, the apparatus contains two limit storage registers in which digital limit signals are set from outside. These limit signals are converted by a digital-to-analog converter into analog voltages which fix upper and lower limits the triangular signal, thereby determining the behavior of the triangular signal and thus also the pulse-width repetition rate of the PWM signal in accordance with the field strength signal.
    • 在立体声解码器中,通过解调器进行信道分离以获得用于立体声操作的信号。 在低接收场强下,解调器中的每个通道都会连续切换到单声道操作。 为此,开关位于解调器的输入和输出之间的信号路径中,并由PWM信号驱动,其脉冲宽度重复率决定是单独执行单声道操作,仅仅是立体声操作或两者的混合。 为了产生PWM信号,将场强信号与三角形信号进行比较。 为了允许制造商根据场强信号的幅度使立体声和单声道操作之间的切换点对齐,该装置包含两个限制存储寄存器,其中从外部设置数字限制信号。 这些极限信号由数模转换器转换成模拟电压,其将上限和下限固定在三角形信号上,从而确定三角形信号的行为,并因此确定PWM信号的脉冲宽度重复率 场强信号。
    • 7. 发明授权
    • Integrated circuit with switched capacitor
    • 集成电路与开关电容器
    • US6133775A
    • 2000-10-17
    • US191560
    • 1998-11-13
    • Jorge SchambacherPeter KirchlechnerJurgen Lubbe
    • Jorge SchambacherPeter KirchlechnerJurgen Lubbe
    • H01L27/06H03H19/00G06F7/64
    • H01L27/0629H03H19/004
    • A switched capacitor wherein one of the plates of the capacitor to be switched is fed with the input signal via a transistor switch receiving as control signal at the gate thereof a pulse train with predetermined frequency. For compensating the parasitic capacitance of the transistor switch, a compensation component is located between the transistor switch and the capacitor to be switched. This compensation component is formed as an incomplete transistor structure, such as only 1/2 of a transistor, has a drain region in common with transistor switch and has an insulated gate. The parasitic capacitance of the compensation component thus is established mainly by the capacitance between the insulated gate and the drain region and thus corresponds to the parasitic capacitance of the transistor switch, whereby complete compensation with optimized charge transfer is achieved.
    • 一种开关电容器,其中要切换的电容器的一个板通过晶体管开关馈送输入信号,该晶体管开关在其栅极处接收具有预定频率的脉冲串的控制信号。 为了补偿晶体管开关的寄生电容,补偿元件位于晶体管开关和要切换的电容器之间。 该补偿元件形成为不完全的晶体管结构,例如晶体管的+ E,fra 1/2 + EE,具有与晶体管开关相同的漏极区域,并且具有绝缘栅极。 因此,补偿分量的寄生电容主要由绝缘栅极和漏极区域之间的电容确定,因此对应于晶体管开关的寄生电容,由此实现具有优化的电荷转移的完全补偿。