公开(公告)号：US09300336B2

公开(公告)日：2016-03-29

申请号：US13957066

申请日：2013-08-01

申请人： HARRIS CORPORATION

发明人： Timothy Giles ,  William Nelson Furman ,  Nicholas Shields ,  Nathan T. Prosser ,  Richard Taylor ,  Daniel E. Stephens

IPC分类号： H04B1/12 ,  H04B1/00 ,  H04L27/38 ,  H04B1/30 ,  H03D1/22

CPC分类号： H04B1/123 ,  H03D1/2245 ,  H04B1/0032 ,  H04B1/30 ,  H04L27/3863

摘要： A direct conversion receiver device may receive I and Q signals. The direct conversion receiver device may include a blind IQ balance circuit configured to balance the I and Q signals without a pilot signal, and a mixer coupled to the blind IQ balance circuit and configured to generate I and Q baseband signals using an operational frequency, the operational frequency being based upon bandwidth and modulation of the I and Q signals. The blind IQ balance circuit may include a first stage configured to generate an intermediate amplitude balanced Q signal based upon the I and Q signals, and a second stage coupled to the first stage and configured to generate phased balanced I and Q signals based upon the intermediate amplitude balanced Q signal and the I signal.

摘要翻译： 直接转换接收机设备可以接收I和Q信号。 直接转换接收机设备可以包括盲IQ平衡电路，其被配置为在没有导频信号的情况下平衡I和Q信号，以及耦合到盲IQ平衡电路并被配置为使用操作频率产生I和Q基带信号的混合器， 工作频率基于I和Q信号的带宽和调制。 盲IQ平衡电路可以包括第一级，其被配置为基于I和Q信号产生中间幅度平衡的Q信号，以及第二级，耦合到第一级，并且被配置为基于中间的平均I和Q信号产生相位平衡的I和Q信号 振幅平衡Q信号和I信号。

公开(公告)号：US08841964B2

公开(公告)日：2014-09-23

申请号：US13578421

申请日：2010-03-10

申请人： Sadik Hafizovic ,  Flavio Heer ,  Stefan Koch ,  Niels Haandbaek

发明人： Sadik Hafizovic ,  Flavio Heer ,  Stefan Koch ,  Niels Haandbaek

IPC分类号： H03D3/04 ,  H03D1/22 ,  H03D3/00

CPC分类号： H03D3/006 ,  H03D1/22

摘要： An apparatus for demodulating an input signal that includes a frequency detector for tracking a frequency of the input signal, an oscillator and a mixer is disclosed. The input signal and an output signal of the oscillator can constitute the incoming signals for the mixer and the output signal of the mixer can constitute the demodulated input signal, wherein an arithmetic unit is arranged downstream of the frequency detector and upstream of the oscillator, wherein the tracked frequency of the input signal and a predefined second frequency constitute the incoming signals of the arithmetic unit and the arithmetic unit is designed such that it computes a control signal for the oscillator from the tracked frequency of the input signal and the predefined second frequency with the output signal of the oscillator depending on the control signal.

摘要翻译： 公开了一种用于解调包括用于跟踪输入信号的频率的频率检测器的输入信号的装置，振荡器和混频器。 振荡器的输入信号和输出信号可以构成混频器的输入信号，并且混频器的输出信号可以构成解调输入信号，其中算术单元布置在频率检测器的下游和振荡器的上游，其中 输入信号的跟踪频率和预定的第二频率构成运算单元的输入信号，并且算术单元被设计成使得其根据输入信号的跟踪频率和预定义的第二频率来计算振荡器的控制信号， 振荡器的输出信号取决于控制信号。

公开(公告)号：US20080144743A1

公开(公告)日：2008-06-19

申请号：US11641995

申请日：2006-12-19

申请人： Jeffrey Donald Alderson ,  Darrell Tinker ,  K. Gozie Ifesinachukwu

发明人： Jeffrey Donald Alderson ,  Darrell Tinker ,  K. Gozie Ifesinachukwu

IPC分类号： H04L27/22 ,  G10L19/00 ,  H03D1/22

CPC分类号： H04L27/3845 ,  H04L27/2331

摘要： A demodulator system and method is disclosed. In an embodiment, the demodulator system can include a Coordinate Rotation Digital Computer (CORDIC) mixer to mix a first signal substantially to baseband using a first input frequency and to mix a second signal substantially to baseband using a second input frequency. In another embodiment, the demodulator system can include a phase detector to receive a pilot signal and to generate a control signal to adjust a decimation rate based on the pilot signal. In another embodiment, the demodulator system can include a symbol decoder to determine a symbol from a phase signal.

摘要翻译： 公开了一种解调器系统和方法。 在一个实施例中，解调器系统可以包括坐标旋转数字计算机（CORDIC）混频器，以使用第一输入频率将第一信号基本上与基带混频，并且使用第二输入频率将基本上与基带的第二信号混合。 在另一个实施例中，解调器系统可以包括相位检测器，用于接收导频信号并产生控制信号以根据导频信号来调节抽取率。 在另一个实施例中，解调器系统可以包括符号解码器，以从相位信号确定符号。

公开(公告)号：US06934346B2

公开(公告)日：2005-08-23

申请号：US10874014

申请日：2004-06-21

申请人： Bengt Lindoff ,  William O. Camp, Jr.

发明人： Bengt Lindoff ,  William O. Camp, Jr.

IPC分类号： H04B1/10 ,  H03D1/22 ,  H04B1/30 ,  H04L25/02 ,  H04L25/06

CPC分类号： H04L25/0212 ,  H03D1/2245 ,  H04L25/061

摘要： An apparatus and method are provided that compensates for the problematic time-varying DC offset by effectively eliminating a near-channel amplited modulated interferer from a signal. The apparatus includes a first channel estimator for estimating a plurality of first channel filter taps Ĥ using a first signal model St, and a second channel estimator for estimating a plurality of second channel filter taps {tilde over (H)} using a second signal model {tilde over (S)}t. The apparatus also includes a processor for selecting which of the first signal model St and the second signal model {tilde over (S)}t is to be used or was used to substantially eliminate the near-channel amplitude modulated interferer from the received signal. The apparatus can be a mobile phone, base station, direct conversion receiver, or communications system (for example).

摘要翻译： 提供了一种通过有效地消除信号中的近通道放大调制干扰源来补偿有问题的时变DC偏移的装置和方法。 该装置包括：第一信道估计器，用于使用第一信号模型S T估计多个第一信道滤波器抽头H;以及第二信道估计器，用于使用第二信道估计器估计多个第二信道滤波器抽头H 信号模型S 。 该装置还包括一个处理器，用于选择要使用的第一信号模型S SUB和第二信号模型S T中的哪一个或用于基本上消除近似的信号， 信道幅度调制干扰源。 该装置可以是移动电话，基站，直接转换接收机或通信系统（例如）。

公开(公告)号：US5909644A

公开(公告)日：1999-06-01

申请号：US764395

申请日：1996-12-11

申请人： Hitoshi Tomiyama

发明人： Hitoshi Tomiyama

IPC分类号： H04B1/26 ,  H03D1/22 ,  H03D7/16 ,  H04B1/30 ,  H04B17/02

CPC分类号： H04B1/30 ,  H03D7/166 ,  H03D1/2245 ,  H03D7/161

摘要： An AM radio receiver of a double superheterodyne type. Where a first intermediate frequency is selected to be a low frequency of several kHz other than 0 kHz. A second intermediate frequency is selected to be several tens of kHz. A first local oscillator circuit formed of a PLL generates first local oscillation signals of two kinds whose phases are different from each other by 90.degree.. First and second mixer circuits are respectively supplied with the first local oscillation signals of two kinds and mix them with a received signals to generate the first intermediate frequency. First and second filters obtain signals each having the first intermediate frequency. A second local oscillator circuit generates second local oscillation signals of two kinds whose phases are different from each other by 90.degree.. Third and fourth mixer circuits are respectively supplied with the signals having the first intermediate frequency and mix them with the second local oscillation signals. An adding circuit adds both signals output from the third and fourth mixer circuits. A third filter is supplied with a signal from the adding circuit and obtains a signal having a second intermediate frequency. Then, an AM detecting circuit detects an amplitude of the signal having the second intermediate frequency to obtain an audio signal. The AM radio receiver has an IC incorporating an intermediate-frequency selecting device which operates as described above.

摘要翻译： 双重超外差型的AM无线电接收机。 其中第一中频选择为除0kHz之外的几kHz的低频。 第二中频选择为几十kHz。 由PLL构成的第一本机振荡电路产生相位彼此相差90°的两种本地振荡信号。 第一和第二混频器电路分别提供两种第一本地振荡信号，并将它们与接收信号混合以产生第一中频。 第一和第二滤波器获得每个具有第一中间频率的信号。 第二本地振荡电路产生两相相位相差90度的第二局部振荡信号。 第三和第四混频器电路分别被提供有具有第一中频的信号并与第二本地振荡信号混合。 加法电路将从第三和第四混频电路输出的信号相加。 第三滤波器被提供有来自加法电路的信号，并获得具有第二中频的信号。 然后，AM检测电路检测具有第二中频的信号的幅度以获得音频信号。 AM无线电接收机具有集成了如上所述操作的中频选择装置的IC。

公开(公告)号：US5896061A

公开(公告)日：1999-04-20

申请号：US256105

申请日：1994-09-22

申请人： Hermann Behrent

发明人： Hermann Behrent

IPC分类号： H03D1/22 ,  H03D3/00 ,  H04B1/30 ,  H04L27/227

CPC分类号： H03D1/22 ,  H03D3/002 ,  H03D3/008 ,  H04B1/30

摘要： The invention pertains to a homodyne receiver, in particular for angle-modulated carrier signals in which the converted signal (ZF) has a d.c. voltage portion, and a process for correcting the converted receiving signal. Essentially three classes of errors occur with homodyne receivers: d.c. offset, amplitude difference and phase errors between the in-phase (I) and quadrature (Q) branches. Standard adjustments of the local oscillator with phase-locked loop (PLL) do not work in the case of weak signals. To use cost-effective, rapid analog/digital converters, particularly the d.c. offset has to be separated out. In so far as this has been done previously and the I and Q signal were corrected also, these corrections could be accomplished only with expensive components in the RF class. To avoid this the invention provides an arithmetic unit that is designed for converting into a circle the ellipse set by the distorted I and Q signals. The ellipse parameters are determined in particular by means of an equalizing computation using at least five samples of the I and Q signals. From the ellipse parameters the errors causing the elliptical form are then calculated and compensated.

摘要翻译： PCT No.PCT / DE93 / 01034 Sec。 371日期1994年9月22日 102（e）1994年9月22日PCT 1993年10月29日PCT公布。 第WO94 / 10756号公报 日期1994年5月11日本发明涉及一种零差接收机，特别是用于角度调制载波信号，其中转换信号（ZF）具有直流 电压部分，以及用于校正转换的接收信号的处理。 基本上三类错误发生在零差接收机上：d.c. 偏移，幅度差和同相（I）和正交（Q）分支之间的相位误差。 使用锁相环（PLL）的本地振荡器的标准调整在弱信号的情况下不起作用。 使用经济高效的快速模拟/数字转换器，特别是直流。 偏移量必须分开。 只要这样做已经完成，I和Q信号也被修正，这些修正只能在射频类中昂贵的部件上完成。 为了避免这种情况，本发明提供了一种算术单元，其被设计用于将通过失真的I和Q信号设置的椭圆转换成圆。 通过使用I和Q信号的至少五个采样的均衡计算来确定椭圆参数。 从椭圆参数，然后计算和补偿导致椭圆形的错误。

公开(公告)号：US5838735A

公开(公告)日：1998-11-17

申请号：US679461

申请日：1996-07-08

申请人： Anders Khullar

发明人： Anders Khullar

IPC分类号： H04L27/06 ,  H03D1/22 ,  H04L25/06 ,  H04L27/14

CPC分类号： H04L25/062 ,  H03D1/2245 ,  Y02B60/50

摘要： Methods and apparatus for detecting, estimating, and compensating for unwanted d.c. offsets in sampled signals in a direct conversion receiver are described. These methods and devices can be used for varying d.c. offsets, ramps, and steps to realize a direct-conversion receiver for modem cellular communication systems that does not suffer performance degradation due to strong interferers.

摘要翻译： 用于检测，估计和补偿不需要的直流的方法和装置。 描述直接转换接收机中的采样信号中的偏移。 这些方法和装置可用于变化直流。 偏移，斜坡和步骤来实现用于调制解调器蜂窝通信系统的直接转换接收机，其不会因强干扰源而遭受性能降级。

公开(公告)号：US5774194A

公开(公告)日：1998-06-30

申请号：US535110

申请日：1996-02-28

申请人： Veit Armbruster

发明人： Veit Armbruster

IPC分类号： H03D1/22 ,  H03D3/02 ,  H03D3/24 ,  H03D5/00 ,  H03D7/00 ,  H03J1/00 ,  H04N5/44 ,  H04N5/455 ,  H04N7/20

CPC分类号： H04N5/4446 ,  H03D3/242 ,  H03D5/00 ,  H03J1/0008 ,  H04B7/18523 ,  H04N21/6112 ,  H04N21/6143 ,  H04N5/455 ,  H04N7/20 ,  H03D1/2254 ,  H03D2200/0082 ,  H04N5/4401

摘要： A tuner is used in common for both terrestrial and satellite television reception. A second mixing stage is switched as a mixer for signal conversion into a second intermediate frequency during terrestrial television reception and is switched as a component of a FM-PLL demodulator during satellite television reception. The tuner is particularly suitable for television receivers and video recorders which receive signals from both a terrestrial antenna/signal source and from a satellite antenna/signal source.

摘要翻译： PCT No.PCT / EP94 / 01676 Sec。 371日期1996年2月28日 102（e）1996年2月28日PCT PCT 1994年5月25日PCT公布。 第WO94 / 29949号公报 日期1994年12月22日一种调谐器用于地面和卫星电视接收。 在地面电视接收期间，将第二混频级作为混频器切换为信号转换为第二中频，并且在卫星电视接收期间作为FM-PLL解调器的组件切换。 该调谐器特别适用于从地面天线/信号源和卫星天线/信号源接收信号的电视接收机和录像机。

公开(公告)号：US5673293A

公开(公告)日：1997-09-30

申请号：US303307

申请日：1994-09-08

申请人： Carl G. Scarpa ,  Joshua L. Koslov ,  Frank A. Lane

发明人： Carl G. Scarpa ,  Joshua L. Koslov ,  Frank A. Lane

IPC分类号： H03D1/22 ,  H03J7/04 ,  H04L27/06 ,  H04L27/38 ,  H03C1/52

CPC分类号： H03D1/22 ,  H03J7/04 ,  H04L27/06 ,  H04L27/3854

摘要： Method and apparatus for providing a QAM, a VSB, and a joint QAM/VSB demodulator are described. The describe demodulators are designed to minimize the amount of duplicated circuitry required to implement a joint QAM/VSB demodulator capable of performing the functions of the disclosed individual QAM and VSB demodulators. All digital architectures are used for each of the described demodulators to facilitate their combination into the described joint VSB/QAM demodulator. The described demodulators are suitable for demodulating, e.g, advanced or high definition television signals modulated using QAM or VSB modulation techniques.

摘要翻译： 描述了提供QAM，VSB和联合QAM / VSB解调器的方法和装置。 所描述的解调器被设计为最小化实现能够执行所公开的各个QAM和VSB解调器的功能的联合QAM / VSB解调器所需的复制电路的数量。 所有数字架构都用于所描述的解调器中的每一个，以便于它们组合到描述的联合VSB / QAM解调器中。 所描述的解调器适用于解调，例如使用QAM或VSB调制技术调制的高级或高清晰度电视信号。

公开(公告)号：US5600680A

公开(公告)日：1997-02-04

申请号：US525247

申请日：1995-09-08

申请人： Akira Mishima ,  Hiroshi Nagai ,  Akio Iwase

发明人： Akira Mishima ,  Hiroshi Nagai ,  Akio Iwase

IPC分类号： H03D1/22 ,  H03D7/16 ,  H03D9/00 ,  H03J7/08 ,  H04N7/10 ,  H04N21/426 ,  H03D5/00

CPC分类号： H03D1/2254 ,  H03J7/08 ,  H03D7/163

摘要： A high frequency television signal receiving apparatus providing excellent linear detection of output characteristics by improving the phase characteristic of the picture synchronous detector. A variable capacitive element is equivalently connected in parallel to a reference solid-state oscillation element. The reference solid-state oscillation element controls the frequency of a local oscillation device including a PLL circuit for feeding a local oscillation signal to a mixer for converting a high frequency signal into an intermediate frequency signal. A first low pass filter is connected between a phase comparator for detecting a phase difference of the intermediate frequency signal and the output of a detection oscillator for generating a detection oscillation signal with a specific phase difference. A second low pass filter having a larger time constant than the first low pass filter is connected to the variable capacitive element. The capacitance of the variable capacitive element is varied by the output voltage of the phase comparator. The signal frequency of the local oscillation device is shifted, and is controlled to converge the frequency of the intermediate frequency signal within the frequency range of the detection oscillation signal.

摘要翻译： 一种高频电视信号接收装置，通过提高图像同步检波器的相位特性，提供优异的输出特性线性检测。 可变电容元件与参考固态振荡元件并联连接。 参考固态振荡元件控制包括用于将本地振荡信号馈送到用于将高频信号转换为中频信号的混频器的PLL电路的本地振荡器件的频率。 第一低通滤波器连接在用于检测中频信号的相位差的相位比较器和用于产生具有特定相位差的检测振荡信号的检测振荡器的输出之间。 具有比第一低通滤波器更大的时间常数的第二低通滤波器连接到可变电容元件。 可变电容元件的电容由相位比较器的输出电压变化。 本地振荡装置的信号频率偏移，并被控制以使中频信号的频率在检测振荡信号的频率范围内收敛。