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公开(公告)号：EP0651576A1
公开(公告)日：1995-05-03
申请号：EP94108839.5
申请日：1994-06-09
申请人： ROBERT BOSCH GMBH
摘要： RF- und TV-Verteilnetz zur Verteilung eines FDM-Signals mit hoher Kanalzahl über Glasfaser, mit einer Station in der Signale von M-Kanälen frequenzumgesetzt und zu dem FDM-Signal zusammengefaßt werden, das nach elektro-optischer Wandlung in das Netz eingespeist wird, mit Teilnehmereinrichtungen, in denen nach optoelektonischer Wandlung das FDM-Signal in die einzelnen Kanalsignale so aufbereitet wird, daß der Teilnehmer auf sie zugreifen kann, dadurch gekennzeichnet,
daß weitere Stationen Si im Netz vorgesehen sind, in denen nach optoelektronischer Wandlung das ankommende FDM-Signal so aufbereitet wird, daß die Signale eine Anzahl weiterer Kanäle zusätzlich oder an freien Frequenzkanälen oder anstelle der Signale frei auswählbarer, besetzter Kanäle in das neue FDM-Signal aufnehmbar sind.
Flexibles und an beliebigen Stellen rekonfigurierbares Verteilsystem, das lokalen Austausch von Programmen und optimale Versorgung eines Gebiets bei Aufrechterhaltung der guten Signalqualität durch durchgängigen Einsatz der digitalen Signalverarbeitung garantiert.摘要翻译： RF和电视分配网络用于FDM信号的具有大量通过光纤信道的分配，频率转换与其中从M个信道信号a站，并且被组合以形成被馈送到电光转换网络中的FDM信号， 用根据optoelektonischer转换订户设备，其中，所述FDM信号被调节在个别信道信号，以使订户可以访问它们，其特征在于在网络中提供的Si附加站，其中，光电转换传入FDM信号之后 被处理，使得信号的数其他通道附加地或在游离的频率信道或代替可自由选择的信号，接收信道在新的FDM信号可接收的。 灵活的和可配置在任何时候分配制度，方案和区域的最佳治疗同时保持一贯使用的数字信号处理保证良好的信号质量的本地交换。
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公开(公告)号：EP0257901B1
公开(公告)日：1993-07-28
申请号：EP87307061.9
申请日：1987-08-10
申请人： AT&T Corp.
CPC分类号： H04J1/12 , H04J1/05 , H04L12/2801
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公开(公告)号：EP0377509A3
公开(公告)日：1992-05-06
申请号：EP90300093.3
申请日：1990-01-04
CPC分类号： H04J1/05
摘要： A digital intermediate frequency (IF) receiver for frequency division multiplexed (FDM) signals including analog circuitry for receiving FDM signals and an analog-to-digital (A/D) converter for converting the received signals to a sampled digital received signal. A digital complex mixer responsive to the digital output of the A/D converter translates the spectrum of the sampled digital received signal to center the desired FDM channel at zero frequency (DC). Digital low pass filtering isolates the desired channel centered at DC, and a digital complex mixer can be used to translate the isolated selected channel to a predetermined IF frequency. The in-phase portion of the digital IF centered selected channel or the DC centered complex envelope selected channel can then be provided to appropriate demodulation or decoder networks.
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34.发明公开Verfahren zur Aufbereitung eines digitalen Frequenzmultiplexsignals sowie dessen Zerlegung 失效Verfahren zur Aufbereitung eines digitalen Frequenzmultiplexsignals sowie dessen Zerlegung。
公开(公告)号：EP0471968A2
公开(公告)日：1992-02-26
申请号：EP91111386.8
申请日：1991-07-09
申请人： ROBERT BOSCH GMBH
IPC分类号： H04J1/05
CPC分类号： H03H17/06 , H03D7/00 , H03D7/161 , H03D7/18 , H03D2200/005 , H03D2200/0058 , H03D2200/006 , H03D2200/0072 , H04J1/05
摘要： Zur Aufbereitung digitaler Frequenzmultiplexsignale werden Polyphasen-Filternetzwerke verwendet, wobei eine Abtastratenwandlung durch Interpolation um den Faktor L vorgenommen wird. Alle Operationen mit Ausnahme der Verschachtelung der Ausgangssignale der L-Zweige des Polyphasen-Filternetzwerkes zu einem Frequenzmultiplex-Gesamtsignal werden bei einer niedrigen Abtastfrequenz f A vorgenommen.
Das Verfahren nach der Erfindung eignet sich insbesondere zur Verarbeitung von TV-Kanalsignalen.摘要翻译： 为了处理数字分频多路复用信号，使用多相滤波器网络，采用因子L进行插值转换采样率。除多路复用信号的L分支的输出信号的多路复用外， 相位滤波器网络以形成总体分频多路复用信号，以低采样频率fA执行。 根据本发明的方法特别适用于处理TV信道信号。
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公开(公告)号：EP0257901A3
公开(公告)日：1989-09-13
申请号：EP87307061.9
申请日：1987-08-10
申请人： AT&T Corp.
CPC分类号： H04J1/12 , H04J1/05 , H04L12/2801
摘要： The present invention relates to a switching technique for packet Frequency Division Multiplexed (FDM) communication systems. In the present system, each of N system users is assigned (a) either a separate fixed one of N transmit frequency channels or a selected free one of L transmit frequency channel for communications to a head-end FDM channel switching means (10), and (b) a fixed assigned separate one of N receive channels for communications from the head-end FDM channels switching means. At the FDM channel switching means, all FDM channel signals received from the system users are directed into separate paths (21) through the switching means. The signals in each path are demodulated (23) to baseband, and a destination address in each packet is detected (28) to determine where each packet is to be sent. Each path in the switching means is hard-wired therethrough to an associated transmitting oscillator (29) which is frequency tuned, by means of the detected destination address, to the unique frequency channel of the user or the external network which is the desired destination of the packet. Thus, switching of a packet signal is accomplished without ever connecting or disconnecting wire lines.
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公开(公告)号：EP0289401A2
公开(公告)日：1988-11-02
申请号：EP88400972.1
申请日：1988-04-21
IPC分类号： H04J1/05
CPC分类号： H04J1/05
摘要： The frequency division multiplexed input signal is sampled in an analog-to-digital converter. The samples are translated by mixing with base band frequency signals to yield real and imaginary values corresponding to phase information in the original modulation signals. After translation, the translated samples are filtered in real and imaginary digital filters. After filtering, the original modulation information is recovered by analysis of the position of vectors in the complex plane represented by the real and imaginary values. In the preferred embodiment, a successive approximation technique is used to determine the angle of the vectors to the real axis. Low pass output filtering may be employed after recovery of the modulation signal for improvements in signal to noise ratio.
In the preferred embodiment, the translation is performed by multiplying the input samples by digital values corresponding to sine and cosine values of local oscillator signals at base band frequencies. Preselect filtering may be employed prior to translation to decimate the input samples where possible to reduce subsequent processing requirements.
In the preferred embodiment, the unit is operated in a first initialization mode in which a microprocessor supplies appropriate filter coefficients corresponding to the frequencies of the channels to be demodulated. Thereafter, the microprocessor does not directly control supply of samples or coefficients to the filters for evaluation. Very high data rates are thus made possible.摘要翻译： 频分复用输入信号在模数转换器中采样。 通过与基带频率信号混合来转换样本，以产生对应于原始调制信号中的相位信息的实数和虚数值。 翻译后，翻译的样本在实数和虚数数字滤波器中进行滤波。 滤波后，通过分析由实数和虚数值表示的复平面中的向量的位置来恢复原始调制信息。 在优选实施例中，使用逐次近似技术来确定向量与实轴的角度。 在恢复调制信号之后可以采用低通输出滤波，以提高信噪比。 在优选实施例中，通过将输入样本乘以对应于基带频率的本地振荡器信号的正弦和余弦值的数字值来执行转换。 可以在转换之前采用预选滤波以在可能的情况下抽取输入样本以减少随后的处理要求。 在优选实施例中，该单元在第一初始化模式下操作，其中微处理器提供与要解调的信道的频率对应的适当滤波器系数。 此后，微处理器不直接控制用于评估的滤波器的样品或系数的供给。 因此可以实现非常高的数据速率。
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37.发明公开Switching techniques for FDM communication systems 失效VermittlungstechnikenfürFrequenzmultiplex-Kommunikationssysteme。
公开(公告)号：EP0257901A2
公开(公告)日：1988-03-02
申请号：EP87307061.9
申请日：1987-08-10
申请人： AT&T Corp.
CPC分类号： H04J1/12 , H04J1/05 , H04L12/2801
摘要： The present invention relates to a switching technique for packet Frequency Division Multiplexed (FDM) communication systems. In the present system, each of N system users is assigned (a) either a separate fixed one of N transmit frequency channels or a selected free one of L transmit frequency channel for communications to a head-end FDM channel switching means (10), and (b) a fixed assigned separate one of N receive channels for communications from the head-end FDM channels switching means. At the FDM channel switching means, all FDM channel signals received from the system users are directed into separate paths (21) through the switching means. The signals in each path are demodulated (23) to baseband, and a destination address in each packet is detected (28) to determine where each packet is to be sent. Each path in the switching means is hard-wired therethrough to an associated transmitting oscillator (29) which is frequency tuned, by means of the detected destination address, to the unique frequency channel of the user or the external network which is the desired destination of the packet. Thus, switching of a packet signal is accomplished without ever connecting or disconnecting wire lines.
摘要翻译： 本发明涉及分组频分复用（FDM）通信系统的切换技术。 在本系统中，N个系统用户中的每一个被分配（a）N个发送频率信道中的单独固定的一个或L个发送频率信道中的所选择的一个，用于通信到前端FDM信道切换装置（10）， 和（b）用于从头端FDM信道切换装置进行通信的N个接收信道中的固定分配的一个。 在FDM信道切换装置中，从系统用户接收到的所有FDM信道信号通过切换装置被引导到单独的路径（21）中。 每个路径中的信号被解调（23）到基带，并且检测每个分组中的目的地地址（28）以确定每个分组将在哪里发送。 开关装置中的每个路径被硬连接到相关联的发射振荡器（29），该发射振荡器通过检测到的目的地地址被频率调谐到用户或外部网络的唯一频率信道，该唯一频率信道是期望的目的地 包。 因此，分组信号的切换是在没有连接或断开有线线的情况下实现的。
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公开(公告)号：EP2611030A1
公开(公告)日：2013-07-03
申请号：EP11819880.3
申请日：2011-08-22
发明人： FUJIMURA, Akinori
摘要： It is an object of the present invention to obtain a demultiplexing apparatus in which a circuit size can be reduced. The demultiplexing apparatus includes a demultiplexed-signal selecting and distributing unit 130 configured to apply frequency conversion processing and down-sampling processing to one or more reception signals and output the reception signals to a designated output destination, frequency converting and reception low-pass filter units 101 to 114 configured to apply frequency conversion processing and low-pass filter processing to the reception signals and output the reception signals while down-sampling the reception signals, selector units 131 to 136 configured to switch an input source of a signal output to the frequency converting and reception low-pass filter unit at the next stage, reception-channel filter units 121 to 128 configured to subject the signals from the frequency converting and reception low-pass filter units 107 to 114 to waveform shaping with a desired frequency characteristic and output the signals, and a filter-bank control unit 13 configured to generate, based on channel information estimated from one or more reception signals, a control signal for controlling the demultiplexed-signal selecting and distributing unit 130 and the selector units 131 to 136.
摘要翻译： 本发明的目的是获得可以减小电路尺寸的解复用装置。 解复用装置包括解复用信号选择和分配单元130，其被配置为对一个或多个接收信号进行频率转换处理和下采样处理，并将接收信号输出到指定的输出目的地，频率转换和接收低通滤波器单元 101〜114被配置为对接收信号进行频率转换处理和低通滤波处理，并且在对接收信号进行下采样的同时输出接收信号，选择器单元131至136被配置为将输出的信号的输入源切换到频率 在下一级的转换和接收低通滤波器单元，被配置为使来自频率转换和接收低通滤波器单元107至114的信号以期望的频率特性和输出的波形整形的接收信道滤波器单元121至128 信号，以及滤波器组控制单元13，被配置为基于该信号生成 从一个或多个接收信号估计的信道信息，用于控制解复用信号选择和分配单元130的控制信号和选择器单元131至136。
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公开(公告)号：EP2509223A1
公开(公告)日：2012-10-10
申请号：EP10833133.1
申请日：2010-11-18
发明人： FUJIMURA, Akinori
CPC分类号： H03H17/0266 , H03H17/06 , H04J1/05 , H04J1/08 , H04J1/085
摘要： To obtain a demultiplexing device that can reduce power consumption. The demultiplexing device includes frequency-conversion and reception low-pass-filter units 101 to 114 that perform a frequency converting process and a low-pass filtering process for causing a signal to pass through a desired band, perform downsampling to reduce a sampling rate to half of a data rate of an input signal, and output the signal, reception channel-filter units 121 to 128 that waveform-shape a signal with a desired frequency characteristic and output the waveform-shaped signal, a filter-bank control unit 13 that generates a clock control signal for supplying a clock to frequency-conversion and reception low-pass-filter units and reception channel-filter units corresponding to signal passage bands, based on channel information, and a reception-clock supply unit 14 that supplies a clock to frequency-conversion and reception low-pass-filter units and reception channel-filter units corresponding to signal passage bands, based on the clock control signal.
摘要翻译： 获得可降低功耗的多路分解器件。 解复用装置包括执行频率转换处理和用于使信号通过期望频带的低通滤波处理的频率转换和接收低通滤波器单元101至114，执行下采样以将采样率降低至 输出信号的一半数据速率并输出该信号;接收信道滤波器单元121至128，其对期望的频率特性的信号进行波形整形并输出该波形整形后的信号;滤波器组控制单元13， 接收时钟提供单元14基于信道信息产生用于将时钟提供给与信号通过频带对应的频率转换和接收低通滤波器单元和接收信道滤波器单元的时钟控制信号， 基于时钟控制信号，将信号传送到与信号通过频带相对应的频率转换和接收低通滤波器单元和接收信道滤波器单元。
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40.发明授权Variable transmission rate digital modem with multi-rate filter bank 有权数字调制解调器传输速度可变与mehrrätiger滤波器组。
公开(公告)号：EP1039667B1
公开(公告)日：2008-04-23
申请号：EP00104405.6
申请日：2000-03-02
发明人： Kazuhiro,Tanabe.c/o Nippon Telegraph,Telephone Cor , Kobayashi,Kiyoshi.c/o Nippon Telegraph,Telephone C , Kazama,Hiroshi.c/o Nippon Telegraph,Telephone Cor.
IPC分类号： H04J1/05
CPC分类号： G01L3/1478 , H04J1/05
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