公开(公告)号：US5477199A

公开(公告)日：1995-12-19

申请号：US319694

申请日：1994-10-07

申请人： Leo Montreuil

发明人： Leo Montreuil

IPC分类号： H04N5/455 ,  H03C3/04 ,  H03C3/40 ,  H03D1/22 ,  H03D1/24 ,  H03D3/00 ,  H03D3/24 ,  H04L27/00 ,  H04L27/02 ,  H04L27/06 ,  H04L27/38 ,  H04N5/44 ,  H03C1/60 ,  H04L27/36

CPC分类号： H03C3/40 ,  H03D1/2254 ,  H04L27/0008 ,  H04L27/02 ,  H04L27/38 ,  H04L27/3836 ,  H04N5/4401 ,  H03C3/04 ,  H03D1/2245 ,  H03D2200/0031 ,  H03D3/007 ,  H03D3/245

摘要： A synchronous detector for demodulating and decoding a digital data signal modulated either according to a vestigial sideband or a quadrature amplitude modulation scheme is based upon the principle of recognizing that a vestigial sideband signal may be regarded and treated as an offset-keyed QAM signal. The detector comprises a tuner for tuning to a center frequency symmetrically displaced within the transmitted digital data signal frequency spectrum and a decoder circuit selectively operating to reconstruct the transmitted digital data stream according to the duration of a transmitted data symbol. A related method of demodulating and decoding a modulated digital data stream comprises analogous steps of tuning to a center carrier frequency and selectively switching between in phase and quadrature arms of the demodulator such that the switch resides in one position or the other for a duration equal to half the duration of a transmitted data symbol. A related modulator for modulating a digital data signal either according to a vestigial sideband or quadrature amplitude modulation scheme comprises a switch for selectively switching an input digital data signal between real and imaginary arms and a modulator for modulating at center frequency. In one modulator embodiment, a noise cancellation circuit may be coupled between the real and imaginary arms.

摘要翻译： 用于解调和解码根据残留边带或正交幅度调制方案调制的数字数据信号的同步检测器基于识别残留边带信号可被视为偏移键控QAM信号的原理。 检测器包括用于调谐到发送的数字数据信号频谱内对称位移的中心频率的调谐器，以及选择性地操作以根据所发送的数据符号的持续时间重建所发送的数字数据流的解码器电路。 解调和解码调制数字数据流的相关方法包括调谐到中心载波频率和选择性地在解调器的同相和正交臂之间切换的类似步骤，使得开关驻留在一个位置或另一个位置，持续时间等于 传输数据符号的持续时间的一半。 用于根据残留边带或正交幅度调制方案调制数字数据信号的相关调制器包括用于选择性地切换实际臂和虚臂之间​​的输入数字数据信号的开关和用于在中心频率调制的调制器。 在一个调制器实施例中，噪声消除电路可以耦合在实际臂和假想臂之间。

公开(公告)号：US5072192A

公开(公告)日：1991-12-10

申请号：US627107

申请日：1990-12-13

申请人： Christian Noguera ,  Pascal Triaud ,  Jean-Luc Foucher

发明人： Christian Noguera ,  Pascal Triaud ,  Jean-Luc Foucher

IPC分类号： H03D3/02 ,  H03D3/24

CPC分类号： H03D3/245 ,  H03D2200/0025 ,  H03D2200/0031

摘要： A phase loop demodulator, in particular for space telecommunications, comprises a primary phase loop, a locking detector circuit responsive to acquisition by the primary loop, and a secondary phase loop controlled by said detector circuit.

摘要翻译： 特别是用于空间电信的相位回路解调器包括主相位回路，响应于主回路采集的锁定检测器电路以及由所述检测器电路控制的次级相位回路。

公开(公告)号：US3710261A

公开(公告)日：1973-01-09

申请号：US3710261D

申请日：1970-12-24

申请人： LOW G ,  LINDSEY W ,  SIMON M

发明人： LOW G ,  LINDSEY W ,  SIMON M

IPC分类号： H03D3/24 ,  H04L27/00 ,  H04L27/227 ,  H04B1/26

CPC分类号： H04L27/2273 ,  H03D3/245 ,  H03D2200/0031 ,  H04L2027/0048 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0069

摘要： The loop signal-to-noise ratio is improved in a phase-locked loop used for tracking a carrier in an angle (phase or frequency) modulated communications system by a quadrature channel added to the phase-locked loop. A d-c signal derived from the quadrature channel is added to the signal fed back to the voltage controlled oscillator in the otherwise conventional phase-locked loop.

摘要翻译： 用于通过添加到锁相环的正交通道在角度（相位或频率）调制的通信系统中跟踪载波的锁相环中环路信噪比得到改善。 将从正交通道导出的d-c信号加到反馈给压控振荡器的信号中，否则常规的锁相环。

公开(公告)号：US08315338B2

公开(公告)日：2012-11-20

申请号：US13043433

申请日：2011-03-08

申请人： Shigenori Hayase ,  Kazuyuki Hori

发明人： Shigenori Hayase ,  Kazuyuki Hori

IPC分类号： H04L27/00

CPC分类号： H03D7/163 ,  H03D3/245 ,  H04L27/3863

摘要： To detect phase mismatches between in-phase and quadrature signals of a quadrature demodulator. The phase mismatches can be detected using the signals obtained by removing high frequency components of output of a multiplier by a low pass filter, the output being the product of the in-phase signals of which low frequency components are removed by a first high pass filter by the quadrature signals of which low frequency components are removed by a second high pass filter.

摘要翻译： 检测正交解调器的同相和正交信号之间的相位失配。 可以使用通过低通滤波器去除乘法器的输出的高频分量而获得的信号来检测相位失配，该输出是通过第一高通滤波器去除低频分量的同相信号的乘积 通过第二高通滤波器去除低频分量的正交信号。

公开(公告)号：US20110158353A1

公开(公告)日：2011-06-30

申请号：US13043433

申请日：2011-03-08

申请人： Shigenori HAYASE ,  Kazuyuki Hori

发明人： Shigenori HAYASE ,  Kazuyuki Hori

IPC分类号： H04L27/00

CPC分类号： H03D7/163 ,  H03D3/245 ,  H04L27/3863

摘要： To detect phase mismatches between in-phase and quadrature signals of a quadrature demodulator. The phase mismatches can be detected using the signals obtained by removing high frequency components of output of a multiplier by a low pass filter, the output being the product of the in-phase signals of which low frequency components are removed by a first high pass filter by the quadrature signals of which low frequency components are removed by a second high pass filter.

摘要翻译： 检测正交解调器的同相和正交信号之间的相位失配。 可以使用通过低通滤波器去除乘法器的输出的高频分量而获得的信号来检测相位失配，该输出是通过第一高通滤波器去除低频分量的同相信号的乘积 通过第二高通滤波器去除低频分量的正交信号。

公开(公告)号：US20070253512A1

公开(公告)日：2007-11-01

申请号：US11412408

申请日：2006-04-27

申请人： Ivan Lawrow ,  Stephen Bate

发明人： Ivan Lawrow ,  Stephen Bate

IPC分类号： H04L27/00 ,  H03D3/24

CPC分类号： H03D3/245 ,  H04L7/002 ,  H04L7/027 ,  H04L27/2273 ,  H04L2027/0057 ,  H04L2027/0065

摘要： Embodiments of the invention consist in a method of carrier synchronization, comprising determining a frequency offset estimate from a rate of change of a phase difference between a local oscillator signal and a carrier signal of a received signal; and adjusting a frequency of the local oscillator signal by the frequency offset estimate.

摘要翻译： 本发明的实施例包括载波同步的方法，包括：根据接收信号的本地振荡器信号和载波信号之间的相位差的变化率确定频率偏移估计; 以及通过频率偏移估计来调整本地振荡器信号的频率。

公开(公告)号：US06693977B2

公开(公告)日：2004-02-17

申请号：US09855613

申请日：2001-05-16

申请人： Hiroshi Katayama ,  Katsuaki Abe ,  Yasumi Imagawa

发明人： Hiroshi Katayama ,  Katsuaki Abe ,  Yasumi Imagawa

IPC分类号： H03D300

CPC分类号： H03D3/245 ,  H03D3/007

摘要： A direct conversion receiver includes a local oscillator for generating a first local oscillator signal having a variable frequency. A 90° phase shifter operates for shifting a phase of the first local oscillator signal by 90° to convert the first local oscillator signal into a second local oscillator signal. A first mixer operates for mixing a received RF signal and the first local oscillator signal. A second mixer operates for mixing the received RF signal and the second local oscillator signal. A first low pass filter processes an output signal of the first mixer. The first low pass filter has a controllable cutoff frequency. A second low pass filter processes an output signal of the second mixer. The second low pass filter has a controllable cutoff frequency. A demodulator recovers an information signal represented by the received RF signal from output signals of the first and second low pass filters. A frequency error detector operates for detecting an error between a frequency of a carrier of the received RF signal and the frequency of the first local oscillator signal in response to the information signal recovered by the demodulator. An oscillator controller operates for controlling the frequency of the first local oscillator signal in response to the error detected by the frequency error detector. A filter controller operates for controlling the cutoff frequencies of the first and second low pass filters in response to the error detected by the frequency error detector.

摘要翻译： 直接转换接收机包括用于产生具有可变频率的第一本机振荡器信号的本地振荡器。 90°移相器用于将第一本地振荡器信号的相位移位90°以将第一本机振荡器信号转换为第二本机振荡器信号。 第一混频器用于混合接收的RF信号和第一本地振荡器信号。 第二混频器用于混合接收到的RF信号和第二本地振荡器信号。 第一低通滤波器处理第一混频器的输出信号。 第一个低通滤波器具有可控的截止频率。 第二低通滤波器处理第二混频器的输出信号。 第二低通滤波器具有可控的截止频率。 解调器从第一和第二低通滤波器的输出信号中恢复由接收的RF信号表示的信息信号。 频率误差检测器用于响应于由解调器恢复的信息信号来检测接收的RF信号的载波的频率与第一本地振荡器信号的频率之间的误差。 振荡器控制器用于响应于由频率误差检测器检测到的误差来控制第一本地振荡器信号的频率。 滤波器控制器用于响应于由频率误差检测器检测到的误差来控制第一和第二低通滤波器的截止频率。

公开(公告)号：US06590950B1

公开(公告)日：2003-07-08

申请号：US09255059

申请日：1999-02-22

申请人： Victor G. Mycynek

发明人： Victor G. Mycynek

IPC分类号： H03D324

CPC分类号： H03D3/245

摘要： A bandwidth stabilized PLL in an FPLL has an I channel including an I channel signal, having a pilot, and a Q channel signal. The DC offset, including the pilot, of the I channel signal is determined. The value of the pilot is found by subtracting the determined DC offset from the I channel signal. An error signal is developed from the known value of the transmitted pilot and the determined value of the pilot. The error signal is used to control a gain block for the Q channel for stabilizing the bandwidth of the PLL. Different embodiments are shown for controlling the gain of the PLL from both inside and outside of the PLL.

摘要翻译： FPLL中的带宽稳定的PLL具有包括具有导频的I信道信号和Q信道信号的I信道。 确定I信道信号的包括导频的DC偏移。 通过从I信道信号中减去所确定的DC偏移来找到导频的值。 从所发射的导频的已知值和导频的确定值产生误差信号。 误差信号用于控制Q通道的增益块，以稳定PLL的带宽。 示出了用于从PLL的内部和外部控制PLL的增益的不同实施例。

公开(公告)号：US20010028689A1

公开(公告)日：2001-10-11

申请号：US09775848

申请日：2001-02-02

发明人： Wolfdietrich Georg Kasperkovitz

IPC分类号： H03D003/18 ,  H03D003/24

CPC分类号： H03D3/245 ,  H03J7/04 ,  H04B1/123 ,  H04B1/28 ,  H04B1/30

摘要： A radio FM receiver is provided with a receiver portion with quadrature channels for converting received radio frequency signals into center frequency quadrature signals, a center frequency filter circuit connected to the former for suppressing undesirable image frequencies, and a first quadrature PLL demodulator for demodulating the obtained center frequency quadrature signals, said PLL being tuned to the carrier frequency within the selected frequency band. An error detector is furthermore present for detecting amplitude and phase errors in the quadrature channels, which error detector in response to the quadrature components of the center frequency signals, the quadrature signals of a VCO in the quadrature PLL demodulator, and the filtered difference said quadrature components of the center frequency signal, supplies amplitude and phase correction signals to a quadrature channel correction network which is provided between the filter circuit and the quadrature PLL demodulator.

摘要翻译： 无线电FM接收机设置有具有用于将接收到的射频信号转换成中心频率正交信号的正交信道的接收机部分，连接到前者的用于抑制不期望的图像频率的中心频率滤波器电路，以及用于解调所获得的第一正交PLL解调器 中心频率正交信号，所述PLL被调谐到所选频带内的载波频率。 此外还存在用于检测正交信道中的幅度和相位误差的误差检测器，该误差检测器响应于中心频率信号的正交分量，正交PLL解调器中的VCO的正交信号，以及所述正交滤波器的差分 将中心频率信号的分量提供给滤波电路和正交PLL解调器之间的正交通道校正网络的幅度和相位校正信号。

公开(公告)号：US20010021234A1

公开(公告)日：2001-09-13

申请号：US09855613

申请日：2001-05-16

申请人： Matsushita Electric Industrial Co., Ltd.

发明人： Hiroshi Katayama ,  Katsuaki Abe ,  Yasumi Imagawa

IPC分类号： H04L027/06

CPC分类号： H03D3/245 ,  H03D3/007

摘要： A direct conversion receiver includes a local oscillator for generating a first local oscillator signal having a variable frequency. A 90null phase shifter operates for shifting a phase of the first local oscillator signal by 90null to convert the first local oscillator signal into a second local oscillator signal. A first mixer operates for mixing a received RF signal and the first local oscillator signal. A second mixer operates for mixing the received RF signal and the second local oscillator signal. A first low pass filter processes an output signal of the first mixer. The first low pass filter has a controllable cutoff frequency. A second low pass filter processes an output signal of the second mixer. The second low pass filter has a controllable cutoff frequency. A demodulator recovers an information signal represented by the received RF signal from output signals of the first and second low pass filters. A frequency error detector operates for detecting an error between a frequency of a carrier of the received RP signal and the frequency of the first local oscillator signal in response to the information signal recovered by the demodulator. An oscillator controller operates for controlling the frequency of the first local oscillator signal in response to the error detected by the frequency error detector. A filter controller operates for controlling the cutoff frequencies of the first and second low pass filters in response to the error detected by the frequency error detector.

摘要翻译： 直接转换接收机包括用于产生具有可变频率的第一本机振荡器信号的本地振荡器。 90°移相器用于将第一本地振荡器信号的相位移位90°以将第一本机振荡器信号转换为第二本机振荡器信号。 第一混频器用于混合接收的RF信号和第一本地振荡器信号。 第二混频器用于混合接收到的RF信号和第二本地振荡器信号。 第一低通滤波器处理第一混频器的输出信号。 第一个低通滤波器具有可控的截止频率。 第二低通滤波器处理第二混频器的输出信号。 第二低通滤波器具有可控的截止频率。 解调器从第一和第二低通滤波器的输出信号中恢复由接收的RF信号表示的信息信号。 频率误差检测器用于响应于由解调器恢复的信息信号来检测所接收的RP信号的载波的频率与第一本地振荡器信号的频率之间的误差。 振荡器控制器用于响应于由频率误差检测器检测到的误差来控制第一本地振荡器信号的频率。 滤波器控制器用于响应于由频率误差检测器检测到的误差来控制第一和第二低通滤波器的截止频率。