Transmitter, transmission method and receiver
    1.
    发明授权
    Transmitter, transmission method and receiver 失效
    发射机,传输方式和接收机

    公开(公告)号:US5311550A

    公开(公告)日:1994-05-10

    申请号:US678262

    申请日:1991-04-22

    摘要: A transmission method and a transmitter and receiver Structure is disclosed which provides for transmission of modulated waves using long pulses with a plurality of frequencies. The method involves two consecutive frequencies being separated by 1/T, where T is the period of the useful transmission intervals. The method and the apparatus are particularly suited to broadcasting and reception of television and radio signals as well as telephone communications between exchanges and between radio telephones and communication stations including terrestrial stations and satellites and local computer networks. Most particularly the method is applicable to high fidelity radio transmissions as well as to high definition television (HDTV).

    摘要翻译: PCT No.PCT / FR89 / 00546 Sec。 371日期1991年04月22日 102(e)日期1991年4月22日PCT提交1989年10月20日PCT公布。 WO90 / 04893 PCT出版物 日期1990年5月3日。一种传输方法和发射机和接收机结构,其公开了使用具有多个频率的长脉冲来传输调制波。 该方法涉及两个连续的频率被1 / T分开,其中T是有用传输间隔的周期。 该方法和装置特别适用于广播和接收电视和无线电信号以及交换机之间以及无线电话和包括地面站和卫星以及本地计算机网络的通信站之间的电话通信。 特别地,该方法适用于高保真无线电传输以及高清电视(HDTV)。

    Method of realigning the local oscillators of a receiver and device for
implementing the method
    3.
    发明授权
    Method of realigning the local oscillators of a receiver and device for implementing the method 失效
    重新配置接收机的本地振荡器和实现该方法的装置的方法

    公开(公告)号:US5313169A

    公开(公告)日:1994-05-17

    申请号:US890605

    申请日:1992-07-13

    摘要: The present invention relates to a method of realigning the local oscillators of a receiver, as well as a device for implementing the method. In a receiver with a high frequency/intermediate frequency translation oscillator, an intermediate frequency/baseband translation oscillator, and a sampling oscillator receiving a signal modulated by at least one circuit for inverse fast Fourier transform FFT.sup.-1 computation according to a multicarrier modulation of OFDM (Orthogonal Frequency Division Multiplexing) type with addition of a transition interval at the start of each transmission interval. The spectrum of the signal has two master lines with a fixed frequency difference between them. The method is characterized by the following steps: (1) determination of the start of a transmission interval; (2) determination of the position of the two master lines; and (3) computation of the variation of the phases of these two lines as a function of time, and exploitation of the result to set the frequency of the sampling oscillator and of the intermediate frequency baseband translation oscillator. The invention will find particular application to digital television.

    摘要翻译: PCT No.PCT / FR91 / 00951 Sec。 371日期:1992年7月13日 102(e)日期1992年7月13日PCT 1991年11月29日PCT PCT。 WO92 / 10043 PCT出版物 日期:1992年6月11日。本发明涉及对接收机的本地振荡器进行重新对准的方法以及用于实现该方法的装置。 在具有高频/中频转换振荡器的接收机中,中频/基带转换振荡器以及接收由至少一个电路调制的信号的采样振荡器,用于根据OFDM的多载波调制的快速傅里叶逆变换FFT-1反相计算 (正交频分复用)类型,并且在每个发送间隔的开始添加转移间隔。 信号的频谱具有两条在它们之间具有固定频率差的主线。 该方法的特征在于以下步骤:(1)确定发送间隔的开始; (2)确定两条主线的位置; 和(3)计算这两条线的相位随时间的变化,并利用结果设定采样振荡器和中频基带转换振荡器的频率。 本发明将特别应用于数字电视。

    Process for transmitting a digitized signal according to OFDM type multicarrier modulation, transmitter and receiver for the implementation of the said process
    4.
    发明授权
    Process for transmitting a digitized signal according to OFDM type multicarrier modulation, transmitter and receiver for the implementation of the said process 失效
    用于根据OFDM型多载波调制发射数字化信号的过程,用于实施所述过程的发射机和接收机

    公开(公告)号:US06201785B1

    公开(公告)日:2001-03-13

    申请号:US08753766

    申请日:1996-11-29

    IPC分类号: H04J1100

    CPC分类号: H04J11/00 H04L5/023

    摘要: The present invention relates to a process for transmitting a digitized signal according to OFDM (Orthogonal Frequency Division Multiplexing) type multicarrier modulation using N orthogonal channels. In accordance with the present invention, the channels are divided into two, N/2 channels. corresponding to a first frequency band being sent via a first transmission track (3A, 4A, 5A, 6A, 7A) according to a first polarization and the remaining N/2 channels being brought back into the same frequency band and sent via a second transmission track (3B, 4B, 5B, 6B, 7B) according to a second polarization crossed with respect to the first.

    摘要翻译: 本发明涉及使用N个正交信道根据OFDM(正交频分复用)型多载波调制发送数字化信号的方法。 根据本发明,信道被分成两个,N / 2个信道。 对应于根据第一极化经由第一传输轨道(3A,4A,5A,6A,7A)发送的第一频带,并且剩余的N / 2信道被带回相同的频带并经由第二传输 轨道(3B,4B,5B,6B,7B)根据相对于第一极化相交的第二极化。

    Projection display device with negative feedback loop to correct all the
faults of the projected image
    5.
    发明授权
    Projection display device with negative feedback loop to correct all the faults of the projected image 失效
    具有负反馈环的投影显示装置,以校正所投影图像的所有故障

    公开(公告)号:US5231481A

    公开(公告)日:1993-07-27

    申请号:US673081

    申请日:1991-03-21

    摘要: A projection display device is provided with a negative feedback chain designed to correct all the faults of the projected image, said faults resulting as much from the projection tubes and from their optic systems (geometrical or focusing faults) as from the differences between these tubes (faults in convergence, colorimetry or uniformity of brilliance). The negative feedback chain comprises a test chart generating means, a means to retake the entire projected image and means for the comparision of the signals coming from the test image and from the retaken image. Correction signals are prepared on the basis of this comparison and are applied to the different control circuits defining the projection characteristics. The disclosed device can also be used for the real-time follow-up of the adjustments obtained in a phase prior to the projection of the sequence of useful video images. The invention can be applied notably to video projectors, retro-projection display devices or beam-index tubes.

    摘要翻译: 投影显示装置设置有负反馈链,其设计用于校正投影图像的所有故障,所述故障从投影管和它们的光学系统(几何或聚焦故障)产生的多少来自这些管之间的差异 收敛错误,比色法或亮度均匀性)。 负反馈链包括测试图生成装置,重放整个投影图像的装置和用于比较来自测试图像和来自再次图像的信号的装置。 基于该比较准备校正信号,并将其应用于定义投影特性的不同控制电路。 所公开的设备还可以用于在投影有用视频图像序列之前的阶段中获得的调整的实时跟踪。 本发明可以应用于视频投影仪,后投影显示装置或光束折射管。

    Device and method for the data transmission or storage optimizing the
use of the pass-band
    6.
    发明授权
    Device and method for the data transmission or storage optimizing the use of the pass-band 失效
    用于数据传输或存储的设备和方法优化了通带的使用

    公开(公告)号:US5271043A

    公开(公告)日:1993-12-14

    申请号:US790645

    申请日:1991-11-08

    摘要: A device and a method for the transmission or storage of data optimizing the use of the pass-band. Also, a method for transmission by phase modulation. In order to obtain high data throughput rates, the synchronization of a transmission clock with the reception clocks is used. This synchronization is gotten, for example, by transmission of a pseudo-random code and by the convolution or correlation of the received signals with the pseudo-random code. The invention also enables the elimination of multiple echoes by computation. The invention can be applied chiefly to the transmission of radio programs, television broadcasts or digital data.

    摘要翻译: 用于传输或存储优化通带使用的数据的装置和方法。 另外,通过相位调制进行发送的方法。 为了获得高数据吞吐率,使用传输时钟与接收时钟的同步。 例如,通过发送伪随机码和通过接收信号与伪随机码的卷积或相关来获得该同步。 本发明还能够通过计算消除多个回波。 本发明可以主要应用于无线电节目,电视广播或数字数据的传输。

    Filter, phase-measuring device and method for application of said filter
    7.
    发明授权
    Filter, phase-measuring device and method for application of said filter 失效
    过滤器,相位测量装置和应用所述过滤器的方法

    公开(公告)号:US4864221A

    公开(公告)日:1989-09-05

    申请号:US214721

    申请日:1988-05-24

    IPC分类号: G01R25/00 H03H9/64

    CPC分类号: G01R25/00

    摘要: The present invention concerns mainly a filter, a phase-measuring device and a method to apply said filter. The main object of the invention is a phase-measuring device. The use of adapted filters (140) enables the increasing of the signal/noise ratio of a received signal. However, if several samples of the signal are sent, each having a different phase, the signal present at the output of the adapted filter at any given instant risks being a mixture of the phase of two successive samples. The use of an odd value filter (141) makes it possible to determine the only instants during which the phase measurement corresponds to the phase of a single sample of the signal. The invention can be applied chiefly to the demodulation, detection or decoding of television and radio broadcasts or phase-modulated data transmissions.

    摘要翻译: PCT No.PCT / FR87 / 00383 Sec。 371日期:1988年5月31日 102(e)日期1988年5月31日PCT提交1987年10月6日PCT公布。 出版物WO88 / 02867 日期:1988年04月21日。本发明主要涉及一种滤波器,相位测量装置和应用所述滤波器的方法。 本发明的主要目的是一种相位测量装置。 使用适配滤波器(140)使得能够增加接收信号的信号/噪声比。 然而,如果发送信号的几个样本,每个样本具有不同的相位,则在任何给定时刻存在于适配滤波器的输出端的信号有可能是两个连续样本的相位的混合。 使用奇数值滤波器(141)使得可以确定相位测量对应于信号的单个采样的相位的唯一时刻。 本发明可以主要用于电视和无线电广播或相位调制数据传输的解调,检测或解码。

    Device and method for data transmission and/or acquisition using two
cross polarizations of an electromagnetic wave and magnetic recording
device
    8.
    发明授权
    Device and method for data transmission and/or acquisition using two cross polarizations of an electromagnetic wave and magnetic recording device 失效
    使用电磁波和磁记录装置的两个交叉极化的数据传输和/或采集的装置和方法

    公开(公告)号:US5262788A

    公开(公告)日:1993-11-16

    申请号:US590809

    申请日:1990-10-01

    CPC分类号: G01S7/025 H04B14/008 H04B7/10

    摘要: A data transmission and/or acquisition device and method are disclosed. The said device and method use two cross polarizations of an electromagnetic wave and a magnetic recording device. The invention pertains to phase/amplitude modulation using two phase-modulated signals transmitted on two orthogonal polarizations. At reception, the vector sum of the two signals is added taken. The resultant signal is amplitude-modulated and/or phase-modulated. The invention can be applied especially to television and radio transmitters, radars and telecommunications equipment.

    摘要翻译: 公开了一种数据传输和/或获取装置和方法。 所述装置和方法使用电磁波和磁记录装置的两个交叉极化。 本发明涉及使用在两个正交偏振上传输的两个相位调制信号的相位/幅度调制。 在接收时,增加两个信号的矢量和。 所得到的信号被幅度调制和/或相位调制。 本发明可以特别适用于电视和无线电发射机,雷达和电信设备。

    Process and device for image display with automatic defect correction by
feedback
    9.
    发明授权
    Process and device for image display with automatic defect correction by feedback 失效
    通过反馈自动修正图像显示的过程和设备

    公开(公告)号:US5091773A

    公开(公告)日:1992-02-25

    申请号:US592257

    申请日:1990-10-03

    CPC分类号: H04N3/2335

    摘要: An automatic defect correction drive utilizing feedback in an image display device. According to the present invention, during an acquisition phase, a test image constituted of bright points of known positions distributed on a screen is displayed. This displayed image is then analyzed via an image acquisition device, to deduce from it the scanning, focusing and amplitude corrections to be applied to the display, so that the test pixels displayed on the screen have their expected positions and characteristics. These corrections are then interpolated for the intermediate pixels between test points, and then, during a continuation phase, these corrections are updated.

    摘要翻译: 一种在图像显示装置中利用反馈的自动缺陷校正驱动器。 根据本发明,在采集阶段期间,显示由分布在屏幕上的已知位置的亮点构成的测试图像。 然后通过图像采集装置对该显示图像进行分析,从而推断应用于显示器的扫描,聚焦和幅度校正,使得屏幕上显示的测试像素具有预期的位置和特性。 然后对于测试点之间的中间像素内插这些校正,然后在连续阶段期间更新这些校正。

    Device and method for data transmission and/or acquisition using two
cross polarizations of an electromagnetic wave and magnetic recording
device
    10.
    发明授权
    Device and method for data transmission and/or acquisition using two cross polarizations of an electromagnetic wave and magnetic recording device 失效
    使用电磁波和磁记录装置的两个交叉极化的数据传输和/或采集的装置和方法

    公开(公告)号:US4968969A

    公开(公告)日:1990-11-06

    申请号:US478730

    申请日:1990-02-12

    CPC分类号: H04B7/10 G01S7/025 H04B14/008

    摘要: A data transmission and/or acquisition device and method are disclosed. The said device and method use two cross polarizations of an electromagnetic wave and a magnetic recording device. The invention pertains to phase/amplitude modulation using two phase-modulated signals transmitted on two orthogonal polarizations. At reception, the vector sum of the two signals is added taken. The resultant signal is amplitude-modulated and/or phase-modulated. The invention can be applied especially to television and radio transmitters, radars and telecommunications equipment.

    摘要翻译: 公开了一种数据传输和/或获取装置和方法。 所述装置和方法使用电磁波和磁记录装置的两个交叉极化。 本发明涉及使用在两个正交偏振上传输的两个相位调制信号的相位/幅度调制。 在接收时,增加两个信号的矢量和。 所得到的信号被幅度调制和/或相位调制。 本发明可以特别适用于电视和无线电发射机,雷达和电信设备。