公开(公告)号：US09325356B2

公开(公告)日：2016-04-26

申请号：US14380936

申请日：2013-03-15

申请人： LSI Corporation

发明人： Peter Kiss ,  Said E. Abdelli ,  Donald R. Laturell ,  James F. MacDonald ,  Steven C. Pinault ,  Ross S. Wilson

IPC分类号： H04B1/04 ,  H03C1/60 ,  H04B1/68 ,  H04L27/02 ,  H04L27/06

CPC分类号： H04B1/0475 ,  H03C1/52 ,  H03C1/60 ,  H03F3/24 ,  H04B1/68 ,  H04B2001/0408 ,  H04L27/02 ,  H04L27/06 ,  H04L27/063

摘要： An SSB transmitter includes a digital-to-digital converter generating first and second real signal components as a function of a complex input signal supplied to the transmitter, and a digital Hilbert transformation module coupled with the digital-to-digital converter and operative to generate first and second transformed signals as a function of the first and second real signal components. The transmitter further includes first and second bit-stream generators operative to generate first and second analog signals as a function of the first and second transformed signals, respectively. The transmitter includes first and second amplifiers. The first amplifier is operative to generate a first amplified signal as a function of the first analog signal. The second amplifier is operative to generate a second amplified signal as a function of the second analog signal. An analog hybrid coupler is connected with the first and second amplifiers and operative to perform an analog Hilbert transformation.

摘要翻译： SSB发射机包括数字 - 数字转换器，其产生作为提供给发射机的复合输入信号的函数的第一和第二实信号分量;以及数字希尔伯特变换模块，与数字 - 数字转换器耦合并且可操作以产生 第一和第二变换信号作为第一和第二实信号分量的函数。 发射机还包括第一和第二比特流发生器，用于分别产生作为第一和第二变换信号的函数的第一和第二模拟信号。 发射机包括第一和第二放大器。 第一放大器用于产生作为第一模拟信号的函数的第一放大信号。 第二放大器用于产生作为第二模拟信号的函数的第二放大信号。 模拟混合耦合器与第一和第二放大器连接并且可操作以执行模拟希尔伯特变换。

公开(公告)号：US09100243B2

公开(公告)日：2015-08-04

申请号：US13924243

申请日：2013-06-21

申请人： QUALCOMM Incorporated

发明人： Yann Ly-Gagnon ,  Paul Husted

IPC分类号： H03D7/18 ,  H04L27/06 ,  H04B1/30 ,  H04L27/38 ,  H03D1/04 ,  H03D7/16 ,  H04B1/10

CPC分类号： H04L27/063 ,  H03D1/04 ,  H03D7/165 ,  H03D7/18 ,  H04B1/30 ,  H04B2001/1072 ,  H04L27/3863

摘要： A method of operating a receiver in a communications system is disclosed. The receiver receives a radio-frequency (RF) data signal and converts the RF data signal to an intermediate frequency. The receiver then determines whether a blocker image interferes with the received data signal, and selectively adjusts the intermediate frequency to which the data signal is converted based on the determination. The receiver may lower the intermediate frequency if the blocker image interferes with the received data signal. The receiver may also deactivate a quadrature chain of the receiver if the blocker image interferes with the received data signal.

摘要翻译： 公开了一种在通信系统中操作接收机的方法。 接收机接收射频（RF）数据信号，并将RF数据信号转换成中频。 然后，接收器确定阻塞图像是否干扰接收到的数据信号，并且基于该确定来选择性地调整数据信号被转换的中频。 如果阻塞图像干扰接收到的数据信号，则接收机可以降低中频。 如果阻塞图像干扰接收的数据信号，则接收机也可以去激活接收机的正交链。

公开(公告)号：US07932958B2

公开(公告)日：2011-04-26

申请号：US12403348

申请日：2009-03-12

申请人： Weijie Yun ,  Samuel Sheng ,  Dennis G. Yee

发明人： Weijie Yun ,  Samuel Sheng ,  Dennis G. Yee

IPC分类号： H04N5/44

CPC分类号： H03D3/008 ,  H03D7/165 ,  H03D2200/0047 ,  H04L25/061 ,  H04L27/063 ,  H04N5/44 ,  H04N5/455 ,  H04N5/50 ,  H04N5/63

摘要： An analog video receiver implemented in an integrated circuit device. The analog video receiver includes an amplifier to amplify an analog video signal having a desired carrier frequency, and a mixing circuit to mix the amplified analog video signal with a complex sinusoid having a frequency substantially equal to the carrier frequency.

摘要翻译： 在集成电路器件中实现的模拟视频接收器。 模拟视频接收机包括用于放大具有期望载波频率的模拟视频信号的放大器，以及混合电路，用于将放大的模拟视频信号与具有基本上等于载波频率的频率的复数正弦曲线混合。

公开(公告)号：US07542100B2

公开(公告)日：2009-06-02

申请号：US11120379

申请日：2005-05-02

申请人： Dennis G. Yee ,  Samuel Sheng

发明人： Dennis G. Yee ,  Samuel Sheng

IPC分类号： H04N5/44 ,  H04N5/455

CPC分类号： H03D3/008 ,  H03D7/165 ,  H03D2200/0047 ,  H04L25/061 ,  H04L27/063 ,  H04N5/44 ,  H04N5/455 ,  H04N5/50 ,  H04N5/63

摘要： An analog video receiver implemented in an integrated circuit device. The analog video receiver includes first and second mixing circuits to generate a complex baseband signal by mixing a carrier-frequency analog video signal with respective sinusoids of a quadrature sinusoid pair; and a filtering circuit to subtract a scaled complex conjugate of the complex baseband signal from the complex baseband signal.

摘要翻译： 在集成电路器件中实现的模拟视频接收器。 模拟视频接收机包括第一和第二混合电路，用于通过将载波频率模拟视频信号与正交正弦曲线对的相应正弦波混合来产生复基带信号; 以及滤波电路，用于从复基带信号中减去复基带信号的缩放复共轭。

公开(公告)号：US20070230624A1

公开(公告)日：2007-10-04

申请号：US11729843

申请日：2007-03-30

申请人： Tarik Aouine ,  Frederic Coutant ,  Michel Gaeta

发明人： Tarik Aouine ,  Frederic Coutant ,  Michel Gaeta

IPC分类号： H04L27/00 ,  H03D3/00

CPC分类号： H04L27/2334 ,  H04L27/0008 ,  H04L27/063 ,  H04L27/08 ,  H04L27/2331

摘要： A demodulation circuit and method are provided. The demodulation circuit includes a transformation circuit which is configured to transform the received signal into a modified signal representation in which both amplitude-varying information and frequency-varying information are converted to a uniform representation; and a processing circuit which is configured to process the modified signal representation to demodulate the received signal based on the uniform representation. The method includes transforming the signal into a modified signal representation in which both amplitude-varying information and frequency-varying information are converted to a uniform representation; and processing the modified signal representation to demodulate the signal based on the uniform representation.

摘要翻译： 提供了解调电路和方法。 解调电路包括变换电路，其被配置为将接收到的信号变换为修改的信号表示，其中将幅度变化信息和频率变化信息都转换为均匀表示; 以及处理电路，被配置为处理所述修改的信号表示以基于所述均匀表示来解调所接收的信号。 该方法包括将信号变换成修改的信号表示，其中幅度变化信息和频率变化信息均被转换为均匀表示; 以及处理所述修改的信号表示以基于所述均匀表示来解调所述信号。

公开(公告)号：US20040192209A1

公开(公告)日：2004-09-30

申请号：US10484899

申请日：2004-01-26

发明人： Max Ward Muterspaugh

IPC分类号： H04B015/00

CPC分类号： H04B1/1081 ,  H01Q1/125 ,  H01Q1/1257 ,  H01Q3/04 ,  H04B1/18 ,  H04B7/005 ,  H04B7/0802 ,  H04B7/10 ,  H04L1/20 ,  H04L27/01 ,  H04L27/063 ,  H04N5/211 ,  H04N5/44 ,  H04N5/50

摘要： Improved signal reception is provided in a digital television signal received by identifying and mitigating multipath signal effects prior to demodulation and equalization. According to an exemplary embodiment, a digital television signal is received having multipath signal effects which cause a plurality of ripples in the received signal. The amplitude of at least one of the ripples and the frequency separation between at least two of the ripples are detected. At least one of an antenna and a tuner is controlled in dependence upon the detection. Signal demodulation and equalization operations may be performed after at least one of the antenna and the tuner is controlled.

摘要翻译： 通过在解调和均衡之前识别和减轻多路径信号效应，在接收的数字电视信号中提供改进的信号接收。 根据示例性实施例，接收具有导致接收信号中的多个波纹的多径信号效应的数字电视信号。 检测至少两个波纹之间的至少一个波纹和频率间隔的振幅。 根据检测来控制天线和调谐器中的至少一个。 可以在控制天线和调谐器中的至少一个之后执行信号解调和均衡操作。

公开(公告)号：US5923378A

公开(公告)日：1999-07-13

申请号：US821945

申请日：1997-03-21

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04N5/21 ,  H04N5/44 ,  H04N5/38

CPC分类号： H04N5/4401 ,  H04L27/063 ,  H04N5/46 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/0065 ,  H04L2001/0093 ,  H04N5/21 ,  H04N5/455

摘要： During a period of transition from broadcasting analog TV signals to broadcasting digital TV signals, digital TV reception is susceptible to disruption owing to co-channel interference by analog TV signals. During this same transition period usually a digital TV receiver will incorporate an auxiliary analog TV receiver. This auxiliary analog TV receiver is advantageously used during digital TV signal reception for determining the amount of co-channel interference by analog TV signals, so that comb filtering can be selectively applied to symbol coding recovered from the digital TV signal, for suppressing artifacts of co-channel interfering analog TV signal when they are large enough to have substantial adverse on symbol decoding. The amount of NTSC co-channel interference is estimated by detecting the level of intercarrier generated by mixing the audio and video signals of the analog TV signal.

摘要翻译： 在从广播模拟电视信号到广播数字电视信号的过渡期间，由于模拟电视信号的同频道干扰，数字电视接收容易受到干扰。 在这个相同的过渡期内，通常数字电视接收机将包括辅助模拟电视接收机。 该辅助模拟TV接收机有利地用于数字TV信号接收期间，用于确定模拟TV信号的同信道干扰量，使得梳状滤波可以选择性地应用于从数字TV信号恢复的符号编码，以抑制co的伪像 - 信道干扰模拟电视信号，当它们足够大以至于对符号解码具有实质性的不利时。 通过检测通过混合模拟TV信号的音频和视频信号产生的载波间的电平来估计NTSC同信道干扰的量。

公开(公告)号：US5731848A

公开(公告)日：1998-03-24

申请号：US577469

申请日：1995-12-22

申请人： C. B. Patel ,  Allen LeRoy Limberg

发明人： C. B. Patel ,  Allen LeRoy Limberg

IPC分类号： H04N5/21 ,  H04N5/44

CPC分类号： H04N5/4401 ,  H03D1/24 ,  H04L27/066 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0087 ,  H04L27/063 ,  H04N5/21

摘要： In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate-frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherency in local oscillations used during frequency conversion. A digital controlled oscillator in the phase tracker supplies digital descriptions of the carrier wave for the final intermediate-frequency signal to a synchronous detector, which synchronous detector detects the real portion of the digitized final intermediate-frequency signal in accordance with those digital descriptions of the carrier wave. The phase tracker generates the real and imaginary portions of the digitized final intermediate-frequency signal using a pair of all-pass digital filters, which exhibit a constant .pi./2 difference in phase response for the digitized bandpass signals and have finite impulse responses.

摘要翻译： 在用于接收包括描述数字信号的符号代码的残留边带（VSB）信号的无线电接收机中，HDTV信号是这样的VSB信号的示例，调谐器提供用于在用于发送这样的VSB信号的频带中的不同位置处选择一个信道 。 调谐器还包括用于执行所选频道的多个转换到由模数转换器数字化的最终中频信号的混频器。 基于其载波频率的数字化最终中频信号的窄带通滤波部分的相位跟踪器抑制由多径失真引起的最终中频信号的虚部，或从多径失真引起的本地振荡中的相位不相干性 变频。 相位跟踪器中的数字控制振荡器将最终中频信号的载波的数字描述提供给同步检波器，该同步检测器根据这些数字描述的数字化最终中频信号的实际部分 载波。 相位跟踪器使用一对全通数字滤波器产生数字化的最终中频信号的实部和虚部，其对于数字化带通信号呈现相位响应的常数π/ 2差并且具有有限的脉冲响应。

公开(公告)号：US2141292A

公开(公告)日：1938-12-27

申请号：US6640836

申请日：1936-02-29

申请人： INT STANDARD ELECTRIC CORP

发明人： GABRIEL CLAVIER ANDRE

IPC分类号： H01J25/72 ,  H03C3/20 ,  H03D7/10 ,  H03D7/20 ,  H04L27/06

CPC分类号： H03D7/20 ,  H01J25/72 ,  H03C3/20 ,  H03D7/10 ,  H04L27/063

公开(公告)号：US1876746A

公开(公告)日：1932-09-13

申请号：US36422129

申请日：1929-05-18

申请人： JOHN HAYS HAMMOND JR

发明人： PURINGTON ELLISON S

IPC分类号： H04L27/06

CPC分类号： H04L27/063