公开(公告)号：US20060232330A1

公开(公告)日：2006-10-19

申请号：US10555269

申请日：2004-04-29

申请人： Johannes Nieuwenburg

发明人： Johannes Nieuwenburg

IPC分类号： H03D3/00

CPC分类号： H03D1/24 ,  H03D1/2281 ,  H04L27/066 ,  H04N5/455

摘要： A demodulator which is arranged to demodulate a first signal with the aid of a second signal, comprises a first bandpass (30) filter arranged to recover the first signal (36) from a received signal (10) and a second bandpass filter (32) arranged to recover the second signal (30) from the received signal (10). Wherein the passband of the second bandpass filter (32) is substantially narrower than the passband of the first bandpass filter (30).

摘要翻译： 一种解调器，其被配置为借助于第二信号来解调第一信号，包括第一带通滤波器，被配置为从接收信号（10）和第二带通滤波器（32）恢复第一信号（36） 被布置成从接收信号（10）恢复第二信号（30）。 其中第二带通滤波器（32）的通带基本上比第一带通滤波器（30）的通带窄。

公开(公告)号：US07061996B2

公开(公告)日：2006-06-13

申请号：US09739807

申请日：2000-12-20

申请人： Joon Tae Kim

发明人： Joon Tae Kim

IPC分类号： H03D1/24 ,  H04L27/06

CPC分类号： H04N5/4401 ,  H03D1/24 ,  H03D3/241 ,  H04L27/02 ,  H04L27/3836

摘要： A vestigial sideband VSB receiver includes a digital processing part for selecting a desired channel frequency via an antenna and converting the desired channel frequency to an intermediate frequency to digitize a predetermined band of the intermediate frequency, a carrier wave restoring part for extracting pilot components from a signal of the digitized pass band to restore carrier waves, and a demodulator for separating components I and Q from the signal of the digitized pass band and multiplying the components with a complex carrier wave, which is restored in the carrier wave restoring part. The carrier waves are restored by extracting the pilot signals from the pass band and detecting the symmetrical errors of the carrier wave frequency, so that the carrier wave may be stably obtained and pursued with relation to the both positive and negative frequency offsets.

摘要翻译： 残留边带VSB接收机包括数字处理部分，用于经由天线选择期望的信道频率，并将期望的信道频率转换为中频以将中频的预定频带数字化;载波恢复部分，用于从 用于恢复载波的数字化通带的信号，以及用于从数字化通带的信号中分离分量I和Q的解调器，并将该分量与在载波恢复部分中恢复的复载波相乘。 通过从通带中提取导频信号并检测载波频率的对称误差来恢复载波，从而可以相对于正的和负的频率偏移来稳定地获得和追求载波。

公开(公告)号：US20040008801A1

公开(公告)日：2004-01-15

申请号：US10614932

申请日：2003-07-07

申请人： LG Electronics Inc.

发明人： Woo Chan Kim

IPC分类号： H03D001/24

CPC分类号： H03D1/24

摘要： VSB reception system with a frequency domain equalizer including a demodulating part for receiving, converting, and demodulating a signal, a frequency domain equalizing part for equalizing the demodulated signal for removing a distorted component from the demodulated signal, and a noise removing part for (a) receiving the equalized signal, (b) calculating a reference error signal that is a difference between the equalized signal and the signal having the noise removed therefrom, (c) calculating an error signal that is a difference between the reference error signal and the extracted noise signal, (d) renewing parameters with reference to the reference error signal and the error signal, and (e) calculating a difference between the equalized signal and the extracted noise signal, to provide a signal having the noise removed therefrom.

摘要翻译： 具有频域均衡器的VSB接收系统，包括用于接收，转换和解调信号的解调部分，用于对解调信号进行均衡的频域均衡部分，用于从解调信号中去除失真分量;以及噪声去除部分，用于（ ）接收均衡信号，（b）计算作为均衡信号与去除噪声的信号之间的差的参考误差信号，（c）计算作为参考误差信号与提取的噪声信号之间的差的误差信号 噪声信号，（d）参考参考误差信号和误差信号更新参数，以及（e）计算均衡信号和提取的噪声信号之间的差异，以提供从其中去除噪声的信号。

公开(公告)号：US06611569B1

公开(公告)日：2003-08-26

申请号：US09165644

申请日：1998-10-02

申请人： Thorsten Schier ,  Svante Signell

发明人： Thorsten Schier ,  Svante Signell

IPC分类号： H03D300

CPC分类号： H03D7/166 ,  H03D1/24 ,  H03D7/161 ,  H03D7/165 ,  H03D2200/0054 ,  H03D2200/0072

摘要： A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer (30, 32) mixes the high frequency signal into a composite signal having an in-phase component and a quadrature component. A complex bandpass filter (34) bandwidth limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer (36, 38) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder (40) adds one component of the intermediate signal to the other. A similar up-converter performs the reverse process.

摘要翻译： 下变频器将幅度调制的高频信号转换为低频或基带信号。 第一混频器（30,32）将高频信号混合成具有同相分量和正交分量的复合信号。 复带通滤波器（34）带宽将复合信号限制为具有同相分量和正交分量的带宽限制信号。 第二混频器（36,38）将带宽限制信号混合成具有同相分量和正交分量的中间信号，并且加法器（40）将中间信号的一个分量加到另一个中。 类似的升压转换器执行相反的过程。

公开(公告)号：US06606025B1

公开(公告)日：2003-08-12

申请号：US09319230

申请日：1999-10-01

申请人： Hans Staufer ,  Anthony Newton

发明人： Hans Staufer ,  Anthony Newton

IPC分类号： H04Q522

CPC分类号： G06K7/0008 ,  H03D1/18 ,  H03D1/22 ,  H03D1/24

摘要： A synchronous demodulator (10) drives an output antenna (21) with a push-pull driver circuit (13). The push-pull driver circuit (13) includes two transistors connected in a push-pull configuration driving a center-tapped transformer (17). The transformer (17) couples the push-pull driver circuit (13) to an antenna (21). Received signals are demodulated in the output driver circuit (13).

摘要翻译： 同步解调器（10）用推挽驱动电路（13）驱动输出天线（21）。 推挽驱动器电路（13）包括以驱动中心抽头变压器（17）的推挽配置连接的两个晶体管。 变压器（17）将推挽驱动电路（13）耦合到天线（21）。 接收信号在输出驱动电路（13）中解调。

公开(公告)号：US06545728B1

公开(公告)日：2003-04-08

申请号：US09294304

申请日：1999-04-14

申请人： Chandrakant B. Patel ,  Allen LeRoy Limberg

发明人： Chandrakant B. Patel ,  Allen LeRoy Limberg

IPC分类号： H04N544

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04L1/006 ,  H04L27/02 ,  H04N5/4401 ,  H04N5/455 ,  H04N5/46

摘要： Receiving apparatus for digital television signals digitizes a final intermediate frequency signal supplied from a triple-conversion radio receiver and synchrodynes the digitized final intermediate frequency signal to baseband. The triple-conversion radio receiver selects one of a plurality of digital television signals for upconversion to that portion of the electromagnetic frequency spectrum above the channels that are used for television broadcasting, amplifies a first intermediate-frequency signal in a first intermediate frequency band generated by that upconversion, amplifies a second intermediate-frequency signal in a second intermediate frequency band generated by downconverting the amplified first intermediate-frequency signal, and supplies a third intermediate-frequency signal in a third intermediate frequency band generated by downconverting the amplified second intermediate-frequency signal. This third intermediate-frequency signal is the final intermediate-frequency signal supplied to the analog-to-digital converter for being linearly converted to a digitized third intermediate-frequency signal. Digital synchrodyning circuitry synchrodynes the digitized third intermediate-frequency signal to baseband and thereby generates at least a real component of digital baseband signal. Circuitry responsive to at least the real component of the digital baseband signal recovers a stream of digital data descriptive of the video and audio portions of television programming.

摘要翻译： 用于数字电视信号的接收装置对从三重转换无线电接收机提供的最终中频信号进行数字化，并将数字化的最终中频信号同步到基带。 三重转换无线电接收机选择多个数字电视信号中的一个用于上变频到用于电视广播的信道上方的电磁频谱的那部分，放大由第一中频频带产生的第一中频频带 通过下变频放大的第一中频信号产生的第二中频带放大第二中频信号，并将第三中频信号提供在通过下变频放大的第二中频信号产生的第三中频带 信号。 该第三中频信号是提供给模数转换器的最终中频信号，用于线性转换为数字化的第三中频信号。 数字同步电路将数字化的第三中频信号同步到基带，从而产生数字基带信号的至少一个实部分量。 响应于至少数字基带信号的实际分量的电路恢复描述电视节目的视频和音频部分的数字数据流。

公开(公告)号：US06526101B1

公开(公告)日：2003-02-25

申请号：US09217634

申请日：1998-12-22

申请人： Chandrakant B. Patel

发明人： Chandrakant B. Patel

IPC分类号： H04N712

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04N5/4401

摘要： Apparatus for reproducing data from a selected digital television signal, transmitted in packet form as quadrature-amplitude-modulation (QAM) of a carrier, has a tuner for selecting a digital television signal and converting it to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter before synchrodyning to baseband in the digital regime. QAM synchrodyning circuitry responsive to the digitized final intermediate-frequency signal generates real and imaginary digital sample streams of QAM symbol code, by synchrodyning the final IF signal to baseband in the digital regime. Symbol decoding circuitry responsive to the real and imaginary digital sample streams of QAM symbol coding generates a digital data stream. Data synchronization recovery circuitry recovers data synchronizing information included in the digital data stream. A video decoder of decompression type, such as an MPEG-2 video decoder responsive to portions of the digital data stream, as selected in response to the data synchronizing information, generates digital signals descriptive of red, green and blue video signals.

摘要翻译： 用于从作为载波的正交幅度调制（QAM）以分组形式发送的所选数字电视信号再现数据的装置具有用于选择数字电视信号并将其转换为最终中频信号的调谐器， 在与数字系统中的基带同步之前，由模数转换器数字化。 响应于数字化的最终中频信号的QAM同步电路通过在数字方式中将最终的IF信号同步到基带来产生QAM符号码的实数和虚数数字采样流。 响应于QAM符号编码的实数和虚数字样本流的符号解码电路产生数字数据流。 数据同步恢复电路恢复包含在数字数据流中的数据同步信息。 解调类型的视频解码器，如响应于数据同步信息选择的响应于数字数据流的部分的MPEG-2视频解码器，产生描述红色，绿色和蓝色视频信号的数字信号。

公开(公告)号：US20020071501A1

公开(公告)日：2002-06-13

申请号：US10005081

申请日：2001-12-07

发明人： Young Mo Gu ,  Sung Ryong Hong

IPC分类号： H03D001/24

CPC分类号： H03D1/24 ,  H03D1/2245

摘要： A VSB receiver and a method for processing a receiving signal in the same are disclosed, which is not subject to frequency offset. The VSB receiver includes an intermediate frequency signal generator generating an intermediate frequency band signal from a received signal; a demodulator generating a complex base band signal consisting of an I channel signal and a Q channel signal using the intermediate frequency band signal and at least one local carrier wave signal; and a complex base band matched filter filtering at least one of the I channel signal and the Q channel signal. In the VSB receiver, since a complex signal responds to a required channel of the I channel and the Q channel, it is possible to prevent performance of the system from being deteriorated by frequency offset.

摘要翻译： 公开了一种VSB接收机及其处理接收信号的方法，其不受频率偏移的影响。 VSB接收机包括从接收信号产生中频带信号的中频信号发生器; 解调器，其使用所述中频带信号和至少一个本地载波信号来生成由I信道信号和Q信道信号组成的复基带信号; 以及对I信道信号和Q信道信号中的至少一个的复数基带匹配滤波器进行滤波。 在VSB接收机中，由于复信号响应于I信道和Q信道的所需信道，所以可以防止系统的频率偏移恶化。

公开(公告)号：US06184942B2

公开(公告)日：2001-02-06

申请号：US09374113

申请日：1999-08-16

申请人： Chandrakant B. Patel ,  Allen LeRoy Limberg

发明人： Chandrakant B. Patel ,  Allen LeRoy Limberg

IPC分类号： H04N5455

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04H20/95 ,  H04H40/27 ,  H04L1/0054 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/063 ,  H04L27/066 ,  H04L27/38 ,  H04L27/3827 ,  H04L2027/0028 ,  H04L2027/0055 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0087 ,  H04N5/4401 ,  H04N5/455 ,  H04N5/46 ,  H04N7/08

摘要： Methods for operating an adaptive receiver for receiving a selected DTV signal, which can be either a quadrature-amplitude-modulation (QAM) signal or a vestigial sideband (VSB) signal. The adaptive receiver includes adaptive symbol decoding circuitry for adaptively decoding baseband signal encoded in different signal formats at selected different code rates to provide a decoded output signal, an adaptive deinterleaver for deinterleaving the decoded output signal in accordance with a deinterleaving function selected from a plurality of deinterleaving functions, and an adaptive error decoder for detecting and correcting errors in the deinterleaver output signal.

摘要翻译： 用于操作用于接收所选DTV信号的自适应接收机的方法，其可以是正交幅度调制（QAM）信号或残留边带（VSB）信号。 自适应接收机包括自适应符号解码电路，用于以选定的不同码率自适应地解码以不同信号格式编码的基带信号，以提供解码的输出信号;自适应解交织器，用于根据从多个信号中选择的解交织功能对解码的输出信号进行解交错; 解交织功能，以及用于检测和纠正解交织器输出信号中的错误的自适应误差解码器。

公开(公告)号：US5675283A

公开(公告)日：1997-10-07

申请号：US691656

申请日：1996-08-02

申请人： Gary J. Sgrignoli

发明人： Gary J. Sgrignoli

IPC分类号： H03D1/24 ,  H04L25/08 ,  H03D1/00

CPC分类号： H03D1/24 ,  H04L25/08

摘要： A polarity detection circuit for an FPLL demodulated signal including a small DC pilot recovers the DC pilot by determining the DC levels of the demodulated output signals both with and without the DC pilot. A zero carrier condition is created for determining the DC level of the output signal without the DC pilot. The two DC levels are subtracted and limited and the polarity of the recovered DC pilot is used to control the operation of a polarity inverter to assure that the output signal has a desired polarity.

摘要翻译： 包括小直流导频的FPLL解调信号的极性检测电路通过确定具有和不具有直流导频的解调输出信号的DC电平来恢复DC导频。 创建零载波条件用于确定没有直流导频的输出信号的直流电平。 减去和限制两个DC电平，并且使用恢复的DC导频的极性来控制极性反相器的操作，以确保输出信号具有期望的极性。